These rock groups consist of Olivine basalt, basalt, andesite basalt. In terms of texture, composed of porphyric texture with microcrystalline pulp (Figure 3) and phenocrysts include of plagioclase, olivine and clinopyroxene. In some samples chlorite and opacities amphibole were observed. Alkali feldspar and quartz can be seen as a rarely sub-grade mineralization. Pennine mineral as result of serve chloritisation were seen in some samples (Figure 4). OPEC minerals were present primarily and secondarily in rocks and rarely tiny cavities which filled with calcite were observed. In some cases, olivine has been serpantnised and formed skeletal structure. Olivine idnegization phenomena startss from margins and fractures and continues to the center of crystals (Figure 5).

The most extensive outcrops of volcano rocks in this region are andesitic lavas. These rocks consists of porphyric texture with microlitic pulp stream or microcrystalline, which in some cases formed as a micro porphyric amygdaloid (Figure 6). Disequilibrium textures such as sieve texture (Figure 7) and embayment in these crystals are rarely seen. Presence of sieve texture in plagioclase phenocrysts of andesitic lavas can be due to an imbalance in the magmatic system. Also,

sieve texture in some cases indicates magmatic mixing and sudden fall of pressure and shows unbalanced conditions in magmatic reservoir in general.

Andesitic rocks is consists of fine microliters-oriented plagioclase with some glass between them. Plagioclase which has zoning is the main mineral in these rocks (Figure 8). Twill twinning (Figure 9), crusader twinning and pericline twinning (Figure 10) can be seen in these rocks. Coarse crystals are seen in different sizes in the fine pulps consists of plagioclase, clinopyroxene, burned hornblende (Figure 11), opaque and glass minerals and in some cases alkali feldspar (sanidine) and rarely quartz. Hornblende type of amphibole are mainly altered and replaced with chlorite, calcite and opaque minerals. Presence of rim reaction in amphibole crystals depends on rate of ascent of magma. Secondary minerals include sericite, epidote, silica, iron oxide and hydroxide mineral.

Phenocrysts are visible in Latite of plagioclase, potassium feldspar, approximately in the same values in the crystallized in fine to glasses. Plagioclase is the most abundant Connie Stone which is largely altered. Amphibole macro crystals were seen as automorphe and sub-automorphe with burned margins are often seen as chloritisate, opacitiesate, epidotisate and carbonatizate. The dominant

process in region hornblendes is apasytisation of hornblendes. In some samples, hornblendes have maintained their hexagonal or diamond shape but completely oxidized. This phenomenon is result of formaion OPEC minerals which seems to be magnetite and hematite. Alkali feldspar is formed as macro crystals up to 40% of phenocrysts. Minor minerals consist of epidote, chlorite, epic minerals and quartz which includes about 2 percent of pulp. Micro enclaves with granitic composition can be seen in a number of andesitic sections (Figure 12).

Plagioclase, alkali feldspar, quartz amphibole have created the mineralogical composition of the rocks. Plagioclase as the most abundant phenocrysts has polysynthetic twinning and clear zoning combination. Presence of zoning combination and consequently regional blackouts represent complex process in the liquid-crystal interface during rapid cooling in lower temperature [35] . In the other hand, the zoning of plagioclase indicates an imbalance during the crystallization and solidification which can be the result of changes in crystal local conditions like thermal turbulence caused by the entry fresh magma in crystallization of magma chamber, rapid decrease in temperature and changes in the water vapor pressure and dissolved gases during crystallization of plagioclase in the magma [36] .

Amphibole, is often seen as shaped crystals (Figure 13) to hypidiomorphic in fine pulps. In some amphibole crystals, burned margins are observed. In most cases these burned margins are the result of oxidation reactions which are caused by heat from sudden pressure drop in magma during ascent.

Alkali feldspar is another minerals of these rocks which seen mostly as fine crystals in stone pulp and it is difficult to be diagnosed. Epic minerals were seen primarily and secondarily in stone pulp. Secondary epic minerals mostly formed as result of hornblende alteration and they are seen in the margin and center of minerals.

Porphyric texture with micro crystal pulp (Figure 14), is the most abundant texture of region dacite rocks. Plagioclase and alkali feldspar, shaped feldspars with eroded margins, are the most important coarse crystals. In the other hand, plagioclase coarse crystals were seen with swinging zoning, which it is the sign of crystallization in unstable physicochemical conditions. Erosion of a solid phase in a fluid phase is a sign of fluid saturation which means that the initial

phase, which has crystallized in fluid due to saturation, is undergoing liquidation due to changing circumstances. Sudden change in temperature, pressure, oxygen fugacity, vapor pressure, digestion stones stuck inside or mixing with other liquid cause changing in the composition of the fluid [36] .

In this study we used diagram presented by Cox et al. diagram [37] for nomination of volcanic rocks. According to the results the rocks of region are within the basalt, andesite basalt, andesite and dacite (Figure 15) with sub-alkaline nature and acid intermediate composition. According to the results of geochemical analysis of samples (Table 1), these samples based on the Winchester & Floyd

charts [38] , are within andesite, dacite and rhyodacite (Figure 16). For determining the magmatic series of volcanic rocks, Irvina & Baragar charts [39] were used and samples were within sub-alcaline, calc-alkaline and rarely tholeiitic because of weathering and lose of potassium oxide (Figure 17 and Figure 18). According to the Luba charts [40] (Figure 19) region rocks are sub-alcaline and

within andesite, basaltic andesite basaltic and dacite. According to the K₂O-SiO₂ (Figure 20) [41] most of the region volcanic rocks are in intermediate groups and fewer in acid range. All of the samples are in low-potassium tholeiitic range.

For recognizing tectonic environment of volcanic rocks within studied area different charts were used. According to the Muller & Groves (1977) [42] charts all samples are in range of volcanic rocks of volcanic arcs after collision (Figure 21 and Figure 22). Moein Vaziri [7] believes that Neotethys Ocean due to movement of afro-arabian plate towards the northeast has subducted (drived) to the

continent of Central Iran. The matching of Subduction zones and dealing with old hydrothermal blades which had created Mesozoic rift within the continent, could cause disturbance in classical magmatism in mentioned tectonic setting. A break of Neotethys oceanic crust in the upper Cretaceous allows that depressed and stopped part of the shell get uniformly warm (hot) and causes the creation of severe volcanoes in the Eocene period. These phenomena continued with less intensity in other parts of the Tertiary [1] . Some researchers [1] [21] believed that most intrusive and semi-volcanic masses of Iran’s tertiary are characterized by Oligo-Miocene ages which formed as result of pressure relief deep magmatic reservoirs of Eocene volcano in orogenic period of Pyrenees and astrains era [7] .

In Figure 23, distribution pattern of rare earth elements (REE) in region samples has been ruled against chondrites [43] . According to the diagrams, all samples are richer than chondrites in REE. Among these, Light rare earth elements (LREE) are richer than High rare earth elements (HREE). As seen in figure, behavior of Eu is almost like other REE and do not represent any particular anomaly. Rollinson, [44] mentioned that, this phenomena happens when fugacity of oxygen is high and distribution coefficient of Eu is low. In spider diagram normative to MORB [45] , region rocks show somewhat depletion in HFSE elements (Figure 24), While enriched from K, Th and Rb elements which has features of magmatic arc rocks or volcanic arc rocks [44] . These elements are special for crustal rocks and may indicate the digestion of crustal rocks by the initial molten material.

In subduction area, fluid released from the upper part of subducted lithosphere which is rich of LILE and poor of Nb are added to the mantle wedge [46] .

The high amount of Ce, K, Rb and Ba elements in these rocks can indicate: 1) Digestion continental crust rocks in the direction of the upper mantle and molten rock is swept; 2) The involvement of magmatic origin of continental crust (partial melting) or deeper magmatic origin (magma mixing); 3) The effect of alkaline metasomatism on the area rocks during or after crystallization and positioning the rocks and 4) Extensive hydrothermal alteration in area rocks (kaolinisation with quartz-sericite alteration) which is a result of magmatic fluids rich shell elements.

In the primitive mantle normalized charts (Figure 25) Enrichment from LREE and HREE were observed in all samples. Enrichment of LREE elements is higher than HREE and negative gradient of the graph indicates the higher amount of LREE than HREE that conforms with the overall pattern of spider diagrams subduction zones. Defant & Drummond [47] mentioned partial enrichment of P in basaltic and andesite samples caused due to presence high amount of apatite in these samples. Provatke and Klemme [48] believed that presence of apatite in rocks in addition to creating a positive anomaly in P can cause Sr enrichment in rocks. Sr plays as a highly consistent element in apatite. Positive anomaly of Rb May be happened due to contamination magma with crustal (due to the high concentration of these elements in the continental crust). Because of the continental crust enriched with Nb and Ta, so suspension of these rocks magmas (although short-term), in the lower continental crust with penetration of crustal fluids into the magma or by digestion of crustal magma rocks cause this type of anomaly in studied samples [49] [50] .

In conjunction with enriched potassium relative to primitive mantle, Watson [51] believed that contamination of magma with continental crust, Even if the other elements remain unchanged, significant amounts of potassium finds a way into the basaltic magma. Also the positive anomaly of Sr in basaltic rocks is justified by the presence in these rocks plagioclase [52] . Similar and parallel trends drawn in all spider diagrams can introduce a single source for these rocks.

Meanwhile, negative anomalies of Ti element in lava can be formed one hand to participate in the partial melting of lithospheric mantle linked metasomatized and on the other hand crustal contamination resulting from digestion are attributed zinocryst [44] .

Using SiO₂ alternation plot against Sr/Y [53] (Figure 26) volcanic rocks of studied area are not located in adakitic rocks groups. Also the Y against Sr/Y diagram [47] (Figure 27) indicate location samples within the volcanic arc.