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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/7839

Title: ARE THE VINJAMUR ROCKS CARBONATITES OR META-LIMESTONES
Authors: SUBBARAO, KV
LEBAS, MJ
RAO, BB
Issue Date: 1995
Publisher: GEOLOGICAL SOC INDIA
Citation: JOURNAL OF THE GEOLOGICAL SOCIETY OF INDIA, 46(2), 125-137
Abstract: New whole-rock rare earth element (REE) data for the metacarbonate rocks interbedded with schists at Vinjamur in the Nellore Schist Belt of Andhra Pradesh, show low total REE contents (Sigma 9-128 ppm) that are inconsistent with an igneous carbonatitic origin but which correspond more closely with a sedimentary limestone origin. The REE data of these rocks however, do not give absolute discrimination between marbles of meta-limestone and metacarbonatite origin. Micro-probe analytical data give better discrimination, and the chemical compositions of the calcite, micas, amphibole, plagioclase, apatite, monazite and staurolite in the Vinjamur marbles give strong and consistent evidence of a metamorphosed sedimentary rather than an igneous origin.
URI: http://dspace.library.iitb.ac.in/xmlui/handle/10054/7839
http://hdl.handle.net/10054/7839
ISSN: 0016-7622
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