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Petrography and Major Geochemical Studies of Anorthosite, Kadavur and Adjoining Area, Tamilnadu, India

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Author Affiliations

  • 1 Dept. of Earth Sciences, Annamalai University, Tamilnadu, INDIA

Int. Res. J. Earth Sci., Volume 1, Issue (5), Pages 15-22, October,25 (2013)

Abstract

The study area occupies a small part of the Madurai Block (MB) of the Southern Granulite Terrain (SGT) in India. It is chiefly represented by anorthosite and gneissic rocks. The economic importance of rocks (massive nature) brought name and fame of this locality all over the world. The term massive is use here for textural sense with reference of homogeneous composition, without preferred crystal orientation or stratification. This is a common feature among anorthosite in massif type complexes. The study area is chiefly composed of metamorphic and igneous formations. They are older and younger gneissic formation, Granitic intrusions and pegmatitic intrusions beside the anorthosite and related rocks. The anorthosite complex is a large anorthosite – gabbro mass emplaced in the core of a regional antiform which occupies the Kadavur basin. This is surrounded in all sides by thick supracrustal hills of quartzites interbanded with quartzo – feldspathic gneisses. The contact between the metasedimentary quartzites and the anorthosites and related rocks exhibits intrusive nature of emplacement. The Geochemical studies of samples are represented in a unique pattern in major oxide concentrations. The Average SiO2 content in the Fe-Ti samples we found 4.06wt%, TiO- 19.88 wt%, Fe- 68.44 wt%. On the basis of TAS Diagram analysis we are classified these rocks in to Picro-basalts and basalt while on the basis of AFM Diagram these falls on sub-alkaline to tholeiitic nature. The geochemical plot study shown that the sample no K12 and K30 rock units are igneous protolith in nature.

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