TITLE:
Modelling Textural Anisotropy of Magnetic Susceptibility of Banded Iron Formations
AUTHORS:
William W. Guo
KEYWORDS:
Textural Anisotropy of Magnetic Susceptibility (AMS), Banded Iron Formation (BIF), Theoretical and Experimental Modelling, Hamersley Province
JOURNAL NAME:
Journal of Applied Mathematics and Physics,
Vol.3 No.4,
April
20,
2015
ABSTRACT: Anisotropy of magnetic susceptibility (AMS)
of banded iron formations (BIFs) is characterized by high anisotropy and
well-developed bedding-parallel magnetic foliation. Since most previous studies
were focused on palaeomagneism of BIFs and BIF-derived iron ores, little effort
has been made to further understand this special type of AMS for BIFs. A
detailed theoretical analysis, incorporating with the previous experimental
data, is made to understand the formative mechanism of this special anisotropy
for BIFs. The good consistence between the theoretical and experimental results
demonstrates that this type of anisotropy is likely caused by the layered
structure of BIFs, and thus verifies the term of textural anisotropy for BIFs.
Theoretical analysis also shows that in the negligence of the inter-layer
magnetic action BIF’s apparent anisotropy increases with an increase in
intrinsic susceptibility of magnetic layers, but decreases with an increase in
length-to- diameter ratio of the magnetic layer.