Tectonic Setting of the Kadiri Schist Belt, Andhra Pradesh, India
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Tectonic Setting of the Kadiri Schist Belt, Andhra Pradesh, India
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The authors express sincere gratitude to Shri L. K. Nanda, Director, AMD for encouragement and logistic support to publish this part of the assigned work. The support and help extended by Dr. Syed Zakaulla (RD/SR, Bangalore), Shri. A. K. Bhatt (Dy. RD/SR, Bangalore) and Shri. V. Natarajan (SO/H) are thankfully acknowledged. Special thanks to Shri. Tanmay Mukherjee, Senior Geologist, GSI for fruitful suggestions. All the fellow colleagues are sincerely acknowledged for direct and indirect supports.

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    Plate tectonic activity has played a critical role in the development of petrotectonic associations in the Kadiri schist belt. The calc alkaline association of basalt, andesite, dacite and rhyolite (BADR) is the signature volcanic rock suite of the convergent margin. The N-S belt has gone below the unconformity plane of Cuddapah sediments. In the northern part geochemical and structural attributes of the Kadiri greenstone belt is studied along with microscopic observations of selected samples. Harker diagram plots of major elements generally indicate a liquid line of descent from a common source, such that BADR rocks are derived from a common parent magma of basaltic to andesitic composition. These calc-alkaline volcanic rocks are formed at convergent margins where more silicic rocks represent more highly fractionated melt. All the litho-units of this greenstone belt indicate crush and strain effects. The stretched pebbles in the deformed volcanic matrix with tectonite development along with associated greenschist facies metamorphism, alteration and hydration is remarkable. Flow foliation plane with N-S strike and very low angle (5° to 10°) easterly dip and N-S axial planar schistosity formed due to later phase isoclinal folding can be clearly identified in the field. Basic intrusives are quite common in the surrounding area. All the observations including the field setting and geochemistry clearly demonstrate ocean-continent subduction as the tectonic environment of the study area.

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Sukanta GOSWAMI, Pradeep K. UPADHYAY, Purnajit BHATTACHARJEE, Malaiandi G. MURUGAN.2017. Tectonic Setting of the Kadiri Schist Belt, Andhra Pradesh, India[J]. ACTA GEOLOGICA SINICA(English edition),91(6):1992~2006

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  • 收稿日期:2015-02-15
  • 最后修改日期:2015-08-10
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  • 在线发布日期: 2017-12-22
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