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ARE THE VINJAMUR ROCKS CARBONATITES OR META-LIMESTONES

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Title ARE THE VINJAMUR ROCKS CARBONATITES OR META-LIMESTONES
 
Creator SUBBARAO, KV
LEBAS, MJ
RAO, BB
 
Subject carbonatites
vinjamur
nellore schist belt
andhra pradesh
 
Description 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.
 
Publisher GEOLOGICAL SOC INDIA
 
Date 2011-07-29T21:30:13Z
2011-12-26T12:52:39Z
2011-12-27T05:39:14Z
2011-07-29T21:30:13Z
2011-12-26T12:52:39Z
2011-12-27T05:39:14Z
1995
 
Type Article
 
Identifier JOURNAL OF THE GEOLOGICAL SOCIETY OF INDIA, 46(2), 125-137
0016-7622
http://dspace.library.iitb.ac.in/xmlui/handle/10054/7839
http://hdl.handle.net/10054/7839
 
Language en