<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE article  PUBLIC "-//NLM//DTD Journal Publishing DTD v3.0 20080202//EN" "http://dtd.nlm.nih.gov/publishing/3.0/journalpublishing3.dtd"><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" dtd-version="3.0" xml:lang="en" article-type="research article"><front><journal-meta><journal-id journal-id-type="publisher-id">OJG</journal-id><journal-title-group><journal-title>Open Journal of Geology</journal-title></journal-title-group><issn pub-type="epub">2161-7570</issn><publisher><publisher-name>Scientific Research Publishing</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.4236/ojg.2016.66041</article-id><article-id pub-id-type="publisher-id">OJG-67804</article-id><article-categories><subj-group subj-group-type="heading"><subject>Articles</subject></subj-group><subj-group subj-group-type="Discipline-v2"><subject>Earth&amp;Environmental Sciences</subject></subj-group></article-categories><title-group><article-title>
 
 
  Investigating the Impress of the Active Tectonics and the Rate of Fractures in Ilam Formation, Fars Area, SW Iran
 
</article-title></title-group><contrib-group><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Reza</surname><given-names>Poursoltani</given-names></name><xref ref-type="aff" rid="aff1"><sup>1</sup></xref><xref ref-type="corresp" rid="cor1"><sup>*</sup></xref></contrib><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Mohsen</surname><given-names>Pourkermani</given-names></name><xref ref-type="aff" rid="aff1"><sup>1</sup></xref></contrib><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Koros</surname><given-names>Yazdjerdi</given-names></name><xref ref-type="aff" rid="aff2"><sup>2</sup></xref></contrib><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Mahmood</surname><given-names>Almassian</given-names></name><xref ref-type="aff" rid="aff1"><sup>1</sup></xref></contrib></contrib-group><aff id="aff2"><addr-line>Department of Geology, Shiraz Branch, Islamic Azad University, Shiraz, Iran</addr-line></aff><aff id="aff1"><addr-line>Department of Geology, North Tehran Branch, Islamic Azad University, Tehran, Iran</addr-line></aff><author-notes><corresp id="cor1">* E-mail:<email>reza.poursoltani@gamil.com(RP)</email>;</corresp></author-notes><pub-date pub-type="epub"><day>17</day><month>06</month><year>2016</year></pub-date><volume>06</volume><issue>06</issue><fpage>498</fpage><lpage>515</lpage><history><date date-type="received"><day>30</day>	<month>April</month>	<year>2016</year></date><date date-type="rev-recd"><day>accepted</day>	<month>26</month>	<year>June</year>	</date><date date-type="accepted"><day>29</day>	<month>June</month>	<year>2016</year></date></history><permissions><copyright-statement>&#169; Copyright  2014 by authors and Scientific Research Publishing Inc. </copyright-statement><copyright-year>2014</copyright-year><license><license-p>This work is licensed under the Creative Commons Attribution International License (CC BY). http://creativecommons.org/licenses/by/4.0/</license-p></license></permissions><abstract><p>
 
 
  The evolution of the Active Tectonics of the Ilam Formation (Santonin) form potential reservoir rocks at oilfields and structures in costal fars. Core and cuttings samples and wire-line logs from wells in the East Gardan field were used to investigate microfacies types and porosity evolution. Facies modelling was applied to predict the relationship between facies distribution and reservoir characteristics to construct a predictive geologic model which will assist future exploration in East Gardan field. Microfacies analysis and electrofacies identification and correlations indicate that the limestones of the Ilam Formation were deposited in a ramp setting. The ramp developed over the distal margin of the Santonin proforeland basin, adjacent to the evolved forebulge. Inner ramp facies are characterized by carbonate bank bioclastic packstones. Middle ramp facies dominate the Ilam Formation and consist of bioturbated, massive, dolomitic and bioclastic limestones. Bioclasts include benthic and planktonic foraminifera. Intense less common Palaeophycus bioturbation has enhanced the porosity of this facies. Outer ramp deposits consist of alternating mid-ramp bioturbated bioclastic massive limestones and argillaceous and marly limestones. Bioclastic packstones and intensively bioturbated bioclastic limestones of the mid-outer ramp are the primary source of fabric-selective porosity which is greatly enhanced by diagenetic overprints.
 
</p></abstract><kwd-group><kwd>Zagros</kwd><kwd> Iran</kwd><kwd> Ilam Formation</kwd><kwd> Field</kwd><kwd> Carbonate Reservoir</kwd></kwd-group></article-meta></front><body><sec id="s1"><title>1. Introduction</title><p>The associated foreland basin represents one of the oldest and richest hydrocarbon provinces known [<xref ref-type="bibr" rid="scirp.67804-ref1">1</xref>] . The fold-and-thrust belt formed as a result of Neogene convergence and suturing between the Arabian Plate and the Iranian block [<xref ref-type="bibr" rid="scirp.67804-ref2">2</xref>] . The Zagros Main Thrust and accompanying ophiolites form the northern margin of the belt and separate it from the Central Iran block. The deformation front of the Iranian part of the belt has an irregular geometry in map view, and is characterized by two major bulges, referred to as the Coastal Fars and Fars salient, separated by the Izeh Embayment (<xref ref-type="fig" rid="fig1">Figure 1</xref>). The Fars area has a long history of hydrocarbon exploration and production but relatively few wells drilled here have been successful. Both high quality source rocks and regional seals are present and carbonates in the Santonian Ilam Formation form a major reservoir unit although permeability varies significantly due to variations in depositional facies and diagenesis.</p><fig id="fig1"  position="float"><label><xref ref-type="fig" rid="fig1">Figure 1</xref></label><caption><title> Location map of the Fars region with the main structural features and subdivisions of the Zagros fold-and-thrust belt</title></caption><graphic mimetype="image"   position="float"  xlink:type="simple"  xlink:href="http://html.scirp.org/file/13-1210503x7.png"/></fig><sec id="s1_1"><title>1.1. Location</title><p>The numerous studies of the Zagros fold-and-thrust belt which have been made, relatively little has been published concerning the link between structural evolution and foreland basin development. Some authors [<xref ref-type="bibr" rid="scirp.67804-ref3">3</xref>] have suggested that basement faults had a significant effect on the geometry of the Zagros deformation front and the evolving foreland basin. Thickness and facies variations, as well as local and regional unconformities, have been related to the reactivation of basement faults or the migration of the foreland basin between Late Cretaceous ophiolite obduction and late Miocene collision [<xref ref-type="bibr" rid="scirp.67804-ref2">2</xref>] [<xref ref-type="bibr" rid="scirp.67804-ref4">4</xref>] . The major regional angular unconformity between the Aghajari Formation has previously been considered to mark the climax of the orogeny in the late Pliocene [<xref ref-type="bibr" rid="scirp.67804-ref5">5</xref>] . More recently, the beginning of Zagros deformation has been dated at different times before the late Pliocene [<xref ref-type="bibr" rid="scirp.67804-ref6">6</xref>] [<xref ref-type="bibr" rid="scirp.67804-ref7">7</xref>] based on various types of geological evidence and methodologies. As a result of its complex stratigraphy and the wide variations in sediment facies and thicknesses, the Fars area is an ideal location in which to study foreland basin development. This paper presents the results of a regional-scale study of basin evolution in the Fars salient (<xref ref-type="fig" rid="fig2">Figure 2</xref>), based on recent fieldwork, together with unpublished logged surface sections of the Late Cretaceous and the early Miocene. The objective was to investigate the effects of the Zagros orogeny and of basement fault activity on basin evolution in Fars.</p></sec><sec id="s1_2"><title>1.2. Geology Setting</title><p>The separation of Arabia from Africa and its convergence with Eurasia was the last in a series of separation-</p><fig id="fig2"  position="float"><label><xref ref-type="fig" rid="fig2">Figure 2</xref></label><caption><title> The location of field photographs (<xref ref-type="fig" rid="fig4">Figure 4</xref> and <xref ref-type="fig" rid="fig5">Figure 5</xref>) is also shown. The proposed Nezam-Abad Fault is marked by dashed lines; note the sinuosity of the Gardan anticline</title></caption><graphic mimetype="image"   position="float"  xlink:type="simple"  xlink:href="http://html.scirp.org/file/13-1210503x8.png"/></fig><p>collision events which gave rise to the Alpine-Himalayan orogenic system [<xref ref-type="bibr" rid="scirp.67804-ref8">8</xref>] . The Zagros fold-and-thrust belt, part of this system, is bounded to the NW by the East Anatolian left-lateral strike-slip fault and to the SE by the Oman line [<xref ref-type="bibr" rid="scirp.67804-ref9">9</xref>] [<xref ref-type="bibr" rid="scirp.67804-ref10">10</xref>] summarized the evolution of the Zagros orogeny in terms of three sequential phases: 1. Subduction of Neo-Tethyan oceanic crust beneath the Iranian lithospheric block during the Early to Late Cretaceous; 2. Emplacement (obduction) of ophiolite sheets derived from the Neo-Tethyan ocean floor over the Arabian continental margin in the Late Cretaceous (Turonian to Campanian) [<xref ref-type="bibr" rid="scirp.67804-ref2">2</xref>] suggested that the beginning of compressional deformation in the Zagros occurred during this time period, during the final closure of Neo-Tethys with the suturing of Arabia with Central Iran. 3. Collision of Afro-Arabian continental lithosphere with the Iranian plates during Late Cretaceous and later times. The growth of anticlines in the Holocene [<xref ref-type="bibr" rid="scirp.67804-ref11">11</xref>] , together with recent seismicity, indicate that deformation in the fold-and-thrust belt is continuing, particularly at deep crustal levels [<xref ref-type="bibr" rid="scirp.67804-ref7">7</xref>] . Regional north-south convergence is taking place at rates which have been estimated at between 25 - 30 mm per year [<xref ref-type="bibr" rid="scirp.67804-ref12">12</xref>] and 20 - 25 mm per year. The rate of convergence varies in different parts of the Zagros belt [<xref ref-type="bibr" rid="scirp.67804-ref13">13</xref>] and the convergence rate is less in Fars than in Fars to the east, based on an Arabia-Iran pole of rotation [<xref ref-type="bibr" rid="scirp.67804-ref14">14</xref>] .</p><p>The Zagros fold-and-thrust belt can be divided into a number of zones which differ according to their structural style and sedimentary history [<xref ref-type="bibr" rid="scirp.67804-ref2">2</xref>] . In Fars, the belt is bounded in the NE by the Main Zagros Reverse Fault and Main Recent Fault (<xref ref-type="fig" rid="fig1">Figure 1</xref>). The Main Zagros Reverse Fault is thought to mark the suture zone between Arabia and Eurasia [<xref ref-type="bibr" rid="scirp.67804-ref8">8</xref>] and has been outlined by earthquake focal mechanism solutions [<xref ref-type="bibr" rid="scirp.67804-ref15">15</xref>] . This fault marks the southern boundary of the Sanandaj-Sirjan metamorphic belt. However, some authors [<xref ref-type="bibr" rid="scirp.67804-ref16">16</xref>] [<xref ref-type="bibr" rid="scirp.67804-ref17">17</xref>] have included the metamorphic rocks located to the NE of the Main Reverse Fault within the Zagros fold belt. The Main Recent Fault, a relatively recent, right-lateral fault, which is currently seismically active along a few segments [<xref ref-type="bibr" rid="scirp.67804-ref18">18</xref>] , follows the trace of the Main Zagros Reverse Fault out of Turkey to approximately lat.32oS, the northern limit of Fars. To the SW, the High Zagros Zone (<xref ref-type="fig" rid="fig1">Figure 1</xref>) contains highly imbricated slices of sedimentary cover rocks and fragments of Cretaceous ophiolites [<xref ref-type="bibr" rid="scirp.67804-ref18">18</xref>] . This zone is up to 80 km wide and forms the topographically highest part of the Zagros [<xref ref-type="bibr" rid="scirp.67804-ref19">19</xref>] ; it contains the oldest exposed rocks and is limited to the SW by segments of the High Zagros Fault. To the SE of the High Zagros zone is the Simply Folded Zone which includes the study area for this paper, and which is bounded to the SW by the Mountain Front [<xref ref-type="bibr" rid="scirp.67804-ref20">20</xref>] or the Mountain Front Fault [<xref ref-type="bibr" rid="scirp.67804-ref18">18</xref>] (<xref ref-type="fig" rid="fig1">Figure 1</xref>). The Zagros belt can also be divided by a series of transverse lineaments. The Bala Rud Fault (or line) separates eastern Fars from the Izeh Embaymen [<xref ref-type="bibr" rid="scirp.67804-ref4">4</xref>] . To the west, Fars is bounded by the Khaneqin fault which separates it from the Kirkuk Embayment (<xref ref-type="fig" rid="fig1">Figure 1</xref>).</p></sec><sec id="s1_3"><title>1.3. Zagros Foreland Basin</title><p>Some 7 to 12 km of sediments were deposited in an epicontinental synorogenic foreland basin which developed in front of the evolving Zagros orogeny [<xref ref-type="bibr" rid="scirp.67804-ref10">10</xref>] . The sedimentary cover rests on Proterozoic metamorphic rocks of the pan-African basement, considered to be the NE continuation of the Arabian Shield which is exposed in the SW of the Arabian Plate. The only exposed basement rocks within the Zagros fold-and-thrust belt are blocks of metamorphic material brought to the surface in salt diapirs [<xref ref-type="bibr" rid="scirp.67804-ref5">5</xref>] , but these are not present in Fars. North-south faults have controlled the facies and thickness of Phanerozoic sedimentary rocks, at least from the middle Cretaceous [<xref ref-type="bibr" rid="scirp.67804-ref20">20</xref>] . A thickness and facies pattern parallel to the developing Zagros (NW-SE trending orogeny) was gradually superimposed on the pre-existing north-south trending subsidence pattern after the Late Cretaceous. Authors have proposed that there are no major angular unconformities within the sedimentary column in the Zagros between the Lower Cambrian and the Pliocene. However, recent studies [<xref ref-type="bibr" rid="scirp.67804-ref4">4</xref>] have documented the occurrence of unconformities which are interpreted to reflect tectonic activity. Thickness variations of Miocene sediments across the Zagros belt are related to patterns of synorogenic sedimentation [<xref ref-type="bibr" rid="scirp.67804-ref4">4</xref>] .</p></sec><sec id="s1_4"><title>1.4. Sedimentary Characteristics</title><p>There are significant differences in sedimentary thickness and facies between Fars and the Izeh Embayment. For example, The Dalan Formation (limestones) and Dashtak Formation (anhydrites) in the Izeh Embayment pass into the Adaiyah Formation (evaporites), Mus Formation (carbonates), Alan Formation (evaporites), Sargelu Formation (shale and marls), Najmeh Formation (carbonates) and Gotnia Formation (evaporites) inFars. Similarly, Cretaceous sedimentary rocks of the Lower Khami Group, including the Fahlian, Gadvan and Darian Formations which mostly consists of neritic carbonates, pass into pelagic facies of the Garau Formation. Thickness and facies changes within the Santonian Ilam Formation have been documented in subsurface data and in the field. The Sarvak Formation, a Paleocene-Eocene limestone in the Izeh Embayment, passes into the Amiran Formation (marls, shales and sandstones), the Talehzang Formation (carbonates), the Kashkan Formation (conglomerate and sandstone) and the Shahbazan Formation (dolomite). A generalized lithologic and stratigraphic column for the study area, based on data from a variety of sources, is shown in (<xref ref-type="fig" rid="fig3">Figure 3</xref>). Data sources include the surface section in the NE of the study area for the Lower Palaeozoic; the Homawells for the Permian to Jurassic; (See <xref ref-type="fig" rid="fig2">Figure 2</xref> for the location of the structures) for the Cretaceous; and a number of measured stratigraphic surface sections for the Upper Cretaceous to lower Miocene interval. These observations indicate significant thickness variations for most of these formations in the study area. However, average thicknesses for each formation are given in the chart of <xref ref-type="fig" rid="fig3">Figure 3</xref>.</p></sec><sec id="s1_5"><title>1.5. Foreland Basin History</title><p>In order to investigate the evolution of the Zagros foreland basin in the study area between the mid-Cretaceous and the onset of Zagros folding, a number of isopach maps for time intervals between the Santonian and Miocene were prepared. These maps were constructed using re-evaluated logged sections originally prepared by, (<xref ref-type="fig" rid="fig1">Figure 1</xref>) together with available well data.</p></sec></sec><sec id="s2"><title>2. Materials and Methods</title><p>For the preparation of the isopach maps, the thickness of sedimentary rocks for each time interval was obtained from surface sections and well data. These values were then adjusted for the exact location of the data sources (surface section or well), and were contoured using minimum curvature equations.</p><p>Santonian sediments were studied in order to investigate the influence of pre-existing basement lineaments</p><fig id="fig3"  position="float"><label><xref ref-type="fig" rid="fig3">Figure 3</xref></label><caption><title> Stratigraphic chart for the Fars region based on measured surface sections, well data and field observations. Formation thicknesses vary throughout the study area, and average values are therefore given</title></caption><graphic mimetype="image"   position="float"  xlink:type="simple"  xlink:href="http://html.scirp.org/file/13-1210503x9.png"/></fig><p>and Zagros folding (Santonian) on the evolution of the basin. The Santonian Ilam Formation is an important carbonate reservoir unit in Fars. Field observations show that the formation is composed of both neritic and pelagic facies in different parts of the study area. In the eastern part of the Homa anticline (<xref ref-type="fig" rid="fig2">Figure 2</xref>), the formation is dominated by pelagic facies (upper Santonian and Turonian) which overlie neritic facies (Santonian) (<xref ref-type="fig" rid="fig4">Figure 4</xref>). The pelagic facies locally follow the approximately north-south trend of the Gardan lineament, within which the axis of the Gardan anticline demonstrates marked sinuosity (<xref ref-type="fig" rid="fig2">Figure 2</xref>). Bedding within the Ilam Formation indicates a clinoform geometry in the Homa anticline (<xref ref-type="fig" rid="fig5">Figure 5</xref>). The presence of pelagic facies in the westernmost part of the Homa anticline and the presence of clinoform stratal patterns in carbonate intervals towards the WNW confirms the palaeo slope of the Ilam Basin from ESE to WNW in this part of the region (<xref ref-type="fig" rid="fig5">Figure 5</xref>). The isopach map for the Santonian (<xref ref-type="fig" rid="fig6">Figure 6</xref>) indicates thickness variations along roughly north-south (or NE-SW) trending anomalies. One of the north-south trending anomalies appears to be aligned with the Gardan lineament. This anomaly coincides with the eastern part of the Homa anticline, where pelagic facies in the Ilam Formation rest on neritic deposits. The thickness of Santonian sediments decreases towards the western and eastern margins of the trend (<xref ref-type="fig" rid="fig6">Figure 6</xref>). The Campanian-Maastrichtian isopach map (<xref ref-type="fig" rid="fig7">Figure 7</xref>) demonstrates thickness variations along a NW-SE trending anomaly parallel to the general trend of the Zagros fold-and-thrust belt. North- south trending anomalies (i.e. those at high angle to the Zagros belt, are absent from this isopach map. The heavy dashed line parallel to the Zagros trend is the best-fit line through the foreland basin depocentres. The Paleocene-Eocene isopach map is based on measured stratigraphic surface sections and well data. A number of NW-SE trending anomalies are apparent on the map. As with <xref ref-type="fig" rid="fig7">Figure 7</xref>, the heavy dashed line is the best-fit line through the foreland basin depocentres. Note that this line of this map is displaced SWwards compared to the Campanian-Maastrichtian isopach map (<xref ref-type="fig" rid="fig7">Figure 7</xref>), demonstrating SWwards migration of the foreland basin depocentre. Further SWwards migration of the depocentre is indicated on the isopach map, relative to the Albian isopach map. The map also shows a NW-SE trending isopach anomaly in the northern part of the study area, and a roughly north-south trending anomaly, aligned with the Gardan lineament, in the southern part. This change in tend is supported by field observations. In the north of the Gardan lineament, there is some evidence for the</p><fig-group id="fig4"><label><xref ref-type="fig" rid="fig4">Figure 4</xref></label><caption><title> Field photographs from the eastern part of the Homa anticline (see <xref ref-type="fig" rid="fig2">Figure 2</xref> for location). The photos show pelagic facies of the Santonian Ilam Formation overlying neritic facies.</title></caption><fig id ="fig4_1"><label></label><graphic mimetype="image"   position="float"  xlink:type="simple"  xlink:href="http://html.scirp.org/file/13-1210503x10.png"/></fig><fig id ="fig4_2"><label></label><graphic mimetype="image"   position="float"  xlink:type="simple"  xlink:href="http://html.scirp.org/file/13-1210503x11.png"/></fig><fig id ="fig4_3"><label></label><graphic mimetype="image"   position="float"  xlink:type="simple"  xlink:href="http://html.scirp.org/file/13-1210503x12.png"/></fig><fig id ="fig4_4"><label></label><graphic mimetype="image"   position="float"  xlink:type="simple"  xlink:href="http://html.scirp.org/file/13-1210503x13.png"/></fig></fig-group><fig-group id="fig5"><label><xref ref-type="fig" rid="fig5">Figure 5</xref></label><caption><title> Field photographs from the core of the Homa anticline (see <xref ref-type="fig" rid="fig2">Figure 2</xref> for location). The photographs show the clinoform stratal pattern within the, Asmari and Jahrom Formations indicating deepening of depositional conditions towards the NW along the Gardan lineament.</title></caption><fig id ="fig5_1"><label></label><graphic mimetype="image"   position="float"  xlink:type="simple"  xlink:href="http://html.scirp.org/file/13-1210503x14.png"/></fig><fig id ="fig5_2"><label></label><graphic mimetype="image"   position="float"  xlink:type="simple"  xlink:href="http://html.scirp.org/file/13-1210503x15.png"/></fig></fig-group><p>existence of a palaeohigh during deposition of the Santonian Ilam Formation carbonates. Thus <xref ref-type="fig" rid="fig8">Figure 8</xref>(a) shows an area close to the eastern plunge of the Saiwah anticline (location in <xref ref-type="fig" rid="fig2">Figure 2</xref>). The photo shows the progradation of Ilam Formation carbonates towards the deeper parts of the Ilam basin from west to east. Also, on the northern flank of the Saiwah anticline (<xref ref-type="fig" rid="fig8">Figure 8</xref>(b), location in <xref ref-type="fig" rid="fig2">Figure 2</xref>), reefal packages within the Ilam carbonates pass into thinner beds to the east, towards the deeper part of the Ilam basin. The western margin of the Gardan lineament at the northern limb of the Genu anticline, NW of Ilam City, is shown in <xref ref-type="fig" rid="fig8">Figure 8</xref>(c) (location on <xref ref-type="fig" rid="fig2">Figure 2</xref>). At this location, the progradational stratal pattern indicates deepening of the Ilam basin towards the west. Finally, a Bouguer anomaly map of the study area with a low-pass filter [<xref ref-type="bibr" rid="scirp.67804-ref21">21</xref>] (<xref ref-type="fig" rid="fig9">Figure 9</xref>) shows thickening of the sedimentary package from SW to NE, at high angle to the Zagros belt.</p><fig id="fig6"  position="float"><label><xref ref-type="fig" rid="fig6">Figure 6</xref></label><caption><title> Isopach map of the Santonian interval in the Fars region based on logged surface sections together with fieldwork data and well data</title></caption><graphic mimetype="image"   position="float"  xlink:type="simple"  xlink:href="http://html.scirp.org/file/13-1210503x16.png"/></fig></sec><sec id="s3"><title>3. Results and Discussion</title><p>In Fars, both reactivation of basement faults and/or Zagros deformation controlled the evolution of the foreland basin between the Late Cretaceous Below, we discuss the isopach maps compiled in order to study the effect of these two elements on foreland basin evolution.</p><sec id="s3_1"><title>3.1. The Effect of North-South Trending Basement Structure on Basin Characteristics</title><p>Previous studies have drawn attention to the presence of north-south trending strike-slip faults in the basement of the Iranian Zagros [<xref ref-type="bibr" rid="scirp.67804-ref22">22</xref>] [<xref ref-type="bibr" rid="scirp.67804-ref23">23</xref>] The effects of some of the north-south structural trends in the basement can be recognized on Landsat images, for example from the sinuosity of the fold axes [<xref ref-type="bibr" rid="scirp.67804-ref24">24</xref>] . Thus, the sinuosity of the Gardan anticline in the southern part of the study area is attributed to offset on a basement lineament which can tentatively be followed into the northern flank of the Homa anticline, SE of Ilam City (<xref ref-type="fig" rid="fig1">Figure 1</xref>0). As mentioned above this trend, which may be a reactivated north-south basement fault, is referred to here as the Gardan lineament. Phases of basement activity during the evolution of the Zagros basin have affected facies and thickness Both thickness changes in the Santonian isopach (<xref ref-type="fig" rid="fig6">Figure 6</xref>), and the change from neritic facies in the Santonian Ilam Formation to mostly pelagic facies elsewhere in the southern part of the study area, take place along the roughly north-south Gardan lineament (<xref ref-type="fig" rid="fig2">Figure 2</xref>). This suggests that this lineament or palaeohigh was active during deposition of Santonian Ilam Formation. After the mid-Cretaceous tectonic phase (post-Santonian), a series of highs aligned in general north-south, parallel to the Arabian trend, originated in the Izeh embayment area. documented the existence of several palaeohighs during deposition of Cretaceous Bangestan Group sediments along pre-existing basement lineaments in the Izeh Embayment. Other authors emphasized that transverse</p><fig id="fig7"  position="float"><label><xref ref-type="fig" rid="fig7">Figure 7</xref></label><caption><title> Isopach map of the Campanian-Maastrichtian interval. Contour interval is 100 m. Isopach anomalies in general trend NW-SE, parallel to the axis of the Zagros belt</title></caption><graphic mimetype="image"   position="float"  xlink:type="simple"  xlink:href="http://html.scirp.org/file/13-1210503x17.png"/></fig><p>strike-slip basement faults in the Zagros (i.e. Arabian trend faults) have controlled the facies and thickness of sediments deposited since at least the middle Cretaceous. The Kazerun and Hendijan-Bahregansar faults (<xref ref-type="fig" rid="fig1">Figure 1</xref>) correspond to a series of roughly north-south striking linear uplifts along pre-existing basement trends. Proposed that these trends were reactivated in response to ophiolite obduction in the Late Cretaceous, and may have influenced sedimentation. Based on seismic data and field observations at Izeh and in the Izeh Embayment documented thickness and facies variations in Albian-Santonian strata along the Hendijan-Bahregansar fault. It is suggested here that the Gardan lineament represents a roughly north-south striking, linear uplift along a pre-existing Arabian basement lineament which was reactivated in the Late Cretaceous (activation before the late Cretaceous is unknown), in response to the onset of the Zagros orogeny and ophiolite obduction. The effects of activity on the Gardan lineament on the evolution of the foreland basin appear to decrease both with time (as indicated by isopach maps: <xref ref-type="fig" rid="fig7">Figure 7</xref>) and in a northwards direction .This demonstrates that, from the Late Cretaceous to the present day, Zagros deformation has been the most important factor controlling the evolution of the foreland basin. However, the influence of the Gardan lineament on sedimentation during the Oligocene- lower Miocene (including the Ilam Formation) can also be detected. As mentioned above, thickness variations and stratal patterns (Figures 8(a)-(c)) indicate that the basin deepened both east- and westwards away from the Gardan lineament. Thus, the lineament appears to have controlled sedimentation in Santonian time especially in the southern part of the study area. However, its impact at this time apparently decreases northwards, unless its effects are obscured by the superimposed Zagros trend.</p></sec><sec id="s3_2"><title>3.2. The Influence of the Zagros Orogeny on Foreland Basin Evolution</title><p>Foreland basins are generally accepted to express downward flexure of the lithosphere in front of a tectonic load</p><fig id="fig8"  position="float"><label><xref ref-type="fig" rid="fig8">Figure 8</xref></label><caption><title> (a) Field photo on the southern limb of the Saiwah anticline, near the eastern side of the Gardan lineament (location in <xref ref-type="fig" rid="fig2">Figure 2</xref>). Photo shows SEward progradation of Santonian Ilam Formation carbonates over Coniacian pelagic marls of the Kazhdomi Formation. (b) Field photo on the northern limb of the Saiwah anticline near the eastern margin of the Gardan lineament (location in <xref ref-type="fig" rid="fig2">Figure 2</xref>). Photo shows west-to-east thinning of a carbonate reefal package within the Ilam Formation. (c) Field photo on the northern limb of the Homa anticline, to the west of the Gardan lineament (location in <xref ref-type="fig" rid="fig2">Figure 2</xref>). Photo shows east-to-west clinoform pattern of carbonate intervals in the Ilam Formation</title></caption><graphic mimetype="image"   position="float"  xlink:type="simple"  xlink:href="http://html.scirp.org/file/13-1210503x18.png"/></fig><p>imposed by the advancing thrust sheets [<xref ref-type="bibr" rid="scirp.67804-ref25">25</xref>] [<xref ref-type="bibr" rid="scirp.67804-ref26">26</xref>] . In the Zagros area, evolution of the foreland basin was accelerated by Late Cretaceous ophiolite obduction in the Izeh Zone. A Bouguer anomaly map of Fars (<xref ref-type="fig" rid="fig9">Figure 9</xref>) [<xref ref-type="bibr" rid="scirp.67804-ref21">21</xref>] shows that the thickness of the sedimentary cover increases perpendicular to the generally NW-SE Zagros trend from the Mountain Front Fault towards the High Zagros Fault, i.e. from SW to NE. This is a common feature of many foreland basins. Thickness variations in the Zagros fold-and-thrust belt during specific time intervals (Campanian-Maastrichtian, Paleocene-Eocene and Oligocene-early Miocene) indicate that the advancing orogenic wedge resulted in downward flexure of successively more external portions of the foreland, and caused the fore-bulge and the depocentre to migrate to more external parts of the foreland. Therefore, locations which were originally far from the advancing orogenic load may have been uplifted before subsiding as a result of the approach of the orogenic wedge. One piece of evidence which is consistent with foreland basin migration in the study area is the presence of a relatively low-angle unconformity between the Kazhdomi and Ilam Formations some 45 km SE of Ilam City (<xref ref-type="fig" rid="fig1">Figure 1</xref>0). This is similar to the unconformity reported by [<xref ref-type="bibr" rid="scirp.67804-ref4">4</xref>] some 40 km north of Izeh, which was interpreted to indicate uplift of the Kazhdomi Formation, and its exposure to surface erosion, before deposition of the Ilam limestone. Successive isopach maps show (<xref ref-type="fig" rid="fig7">Figure 7</xref>).</p><p>SW ward migration of the foreland basin depocentre between the Campanian and the early Miocene. In order to trace the effects of the Zagros orogeny on basin evolution, a graph of geological time versus depocentre location was prepared (<xref ref-type="fig" rid="fig1">Figure 1</xref>1) (the best-fit line through the depocentres is marked as a dashed line on the isopach maps). Using the Campanian-Maastrichtian isopach map as a reference. The orthogonal distance between successive best-fit lines was considered to indicate the amount of depocentre migration towards the SW from the end-Maastrichtian to the end-early Miocene). The graph shows that about 40 km of SWward depocentre migration took place at a rate of about 1 km/Ma between 66 Ma and 34 Ma (Albian-Santonian). From 34 to 16 Ma (Mastrichtian), the depocentre migrated some 26 km to the SW at a faster rate of 1.45 km/Ma. Thus there was an increase in the rate of the depocentre migration towards the SW in the Santonian-Campanian compared to the Mastrichtian. The reasons for this change in the rate of depocenter migration remain speculative and are not discussed here.</p><fig id="fig9"  position="float"><label><xref ref-type="fig" rid="fig9">Figure 9</xref></label><caption><title> Bouguer anomaly map of the study area with a 20 km low pass filter. The map shows NW-SE thickening of the sedimentary cover in the Fars foreland basin, at high angle to the general Zagros trend</title></caption><graphic mimetype="image"   position="float"  xlink:type="simple"  xlink:href="http://html.scirp.org/file/13-1210503x19.png"/></fig><fig id="fig10"  position="float"><label><xref ref-type="fig" rid="fig1">Figure 1</xref>0</label><caption><title> Field photograph and line drawing interpretation, 45 km SE of Ilam City (location in <xref ref-type="fig" rid="fig2">Figure 2</xref>). Cliffs are about 150 m high. Note the angular unconformity between the marl-dominated Kazhdomi Formation (Albian) and the Ilam Limestone (Santonian)</title></caption><graphic mimetype="image"   position="float"  xlink:type="simple"  xlink:href="http://html.scirp.org/file/13-1210503x20.png"/></fig><fig id="fig11"  position="float"><label><xref ref-type="fig" rid="fig1">Figure 1</xref>1</label><caption><title> Graph showing migration of the Zagros foreland basin depocentre to the SW between the Maastrichtian. The horizontal axis shows orthogonal distance (in km) between the heavy dashed lines on the isopach maps relative to the Campanian-Maastrichtian isopach map</title></caption><graphic mimetype="image"   position="float"  xlink:type="simple"  xlink:href="http://html.scirp.org/file/13-1210503x21.png"/></fig></sec><sec id="s3_3"><title>3.3. Relative Active Tectonics of the Zagros Orogenic Belt</title><p>The study area is situated in Zagros fold and thrust belt [<xref ref-type="bibr" rid="scirp.67804-ref27">27</xref>] - [<xref ref-type="bibr" rid="scirp.67804-ref34">34</xref>] (<xref ref-type="fig" rid="fig1">Figure 1</xref>). From tectonics view, it contains orogenic belt of Arabian plate [<xref ref-type="bibr" rid="scirp.67804-ref35">35</xref>] - [<xref ref-type="bibr" rid="scirp.67804-ref37">37</xref>] . Based on previous work on the salt and mud diapirism [<xref ref-type="bibr" rid="scirp.67804-ref38">38</xref>] - [<xref ref-type="bibr" rid="scirp.67804-ref49">49</xref>] and neotectonic regime in Iran [<xref ref-type="bibr" rid="scirp.67804-ref50">50</xref>] - [<xref ref-type="bibr" rid="scirp.67804-ref55">55</xref>] , Zagros is the most active zone [<xref ref-type="bibr" rid="scirp.67804-ref56">56</xref>] - [<xref ref-type="bibr" rid="scirp.67804-ref78">78</xref>] . Then, Alborz [<xref ref-type="bibr" rid="scirp.67804-ref79">79</xref>] - [<xref ref-type="bibr" rid="scirp.67804-ref120">120</xref>] and Central Iran [<xref ref-type="bibr" rid="scirp.67804-ref121">121</xref>] - [<xref ref-type="bibr" rid="scirp.67804-ref138">138</xref>] have been situated in the next orders. Therefore, active tectonics have got an important rule on the rate of fractures on Ilam Formation in the study area.</p></sec></sec><sec id="s4"><title>4. Conclusion</title><p>The analysis of the basin depocentre between Late Cretaceous obduction and the Santonian indicates progressive SWward migration of the depocentre at different rates during the Zagros orogeny, and documents the evolution of a typical foreland basin in the Fars area. During deposition of the Santonian Ilam and Ilam Formations in southern Fars, the architecture of the foreland basin was influenced by the deep-seated, approximately north- south trending Gardan lineament. During the Santonian to Campanian time interval, this lineament was reactivated to form a palaeohigh in the southern part of the study area. This paleohigh caused facies and thickness changes in the Ilam Formations. Facies changes in the Ilam Formation may explain the observed variations in reservoir quality in the Fars region.</p></sec><sec id="s5"><title>Acknowledgements</title><p>This study was conducted as a part of Ph.D. degree granted by Islamic Azad University, North Tehran Branch.</p></sec><sec id="s6"><title>Cite this paper</title><p>Reza Poursoltani,Mohsen Pourkermani,Koros Yazdjerdi,Mahmood Almassian, (2016) Investigating the Impress of the Active Tectonics and the Rate of Fractures in Ilam Formation, Fars Area, SW Iran. 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