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Metacarbonatite or marble? - the case of the carbonate, pyroxenite, calcite-apatite rock complex at Borra, Eastern Ghats, India

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Title Metacarbonatite or marble? - the case of the carbonate, pyroxenite, calcite-apatite rock complex at Borra, Eastern Ghats, India
 
Creator LE BAS, MJ
SUBBARAO, KV
WALSH, JN
 
Subject tamil-nadu
grenville province
upper-mantle
metamorphism
granulites
limestones
mineralogy
ontario
magmas
earth
carbonatite
metacarbonatite
marble
pyroxenite
trace elements
al-pyroxene
 
Description Carbonatites are often of economic importance, which raises the problem of distinguishing carbonatites from limestones when either are metamorphosed to high-grade marbles. They can be of similar appearance, particularly those from the Proterozoic and Archaean of the Indian Subcontinent. This study also contributes to solving the problem of determining the frequency of alkaline and carbonatitic magmatism during the early history of the Earth. The mineral assemblage of apatite-magnetite-phlogopite-calcite is common to marbles of both carbonatite and limestone origin. If pyrochlore is present that identifies the rock as carbonatite, if anorthite, fassaite, scapolite or spinel then it was formerly a limestone. If these minerals are absent. then trace element analysis can supply the critical Sr and REE data, which are both normally high in carbonatitic rocks and low in former limestones. These distinguishing factors are applied to the metamorphic carbonate, pyroxenite, calcite-apatite rock complex at Borra, Eastern Ghats, India, which has been variously interpreted as formerly a carbonatite and as a limestone. The evidence shows that the Borra rocks are meta-sedimentary. (C) 2002 . .
 
Publisher PERGAMON-ELSEVIER SCIENCE LTD
 
Date 2011-08-25T12:44:51Z
2011-12-26T12:57:04Z
2011-12-27T05:46:48Z
2011-08-25T12:44:51Z
2011-12-26T12:57:04Z
2011-12-27T05:46:48Z
2002
 
Type Article
 
Identifier JOURNAL OF ASIAN EARTH SCIENCES, 20(2), 127-140
1367-9120
http://dx.doi.org/10.1016/S1367-9120(01)00030-X
http://dspace.library.iitb.ac.in/xmlui/handle/10054/11021
http://hdl.handle.net/10054/11021
 
Language en