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Titolo:
Metacarbonatite or marble? - the case of the carbonate, pyroxenite, calcite-apatite rock complex at Borra, Eastern Ghats, India
Autore:
Le Bas, MJ; Subbarao, KV; Walsh, JN;
Indirizzi:
Univ Leicester, Dept Geol, Leicester LE1 7RH, Leics, England Univ Leicester Leicester Leics England LE1 7RH er LE1 7RH, Leics, England Indian Inst Technol, Bombay 400076, Maharashtra, India Indian Inst Technol Bombay Maharashtra India 400076 6, Maharashtra, India Univ London Royal Holloway & Bedford New Coll, Dept Geol, Egham TW20 0EX, Surrey, England Univ London Royal Holloway & Bedford New Coll Egham SurreyEngland TW20 0EX
Titolo Testata:
JOURNAL OF ASIAN EARTH SCIENCES
fascicolo: 2, volume: 20, anno: 2002,
pagine: 127 - 140
SICI:
1367-9120(200201)20:2<127:MOM-TC>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
TAMIL-NADU; GRENVILLE PROVINCE; UPPER-MANTLE; METAMORPHISM; GRANULITES; LIMESTONES; MINERALOGY; ONTARIO; MAGMAS; EARTH;
Keywords:
carbonatite; metacarbonatite; marble; pyroxenite; trace elements; Al-pyroxene;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
65
Recensione:
Indirizzi per estratti:
Indirizzo: Le Bas, MJ Univ Southampton, Sch Ocean & Earth Sci, Southampton SO14 3ZH, Hants, England Univ Southampton Southampton Hants England SO14 3ZH s, England
Citazione:
M.J. Le Bas et al., "Metacarbonatite or marble? - the case of the carbonate, pyroxenite, calcite-apatite rock complex at Borra, Eastern Ghats, India", J ASIAN E S, 20(2), 2002, pp. 127-140

Abstract

Carbonatites are often of economic importance, which raises the problem ofdistinguishing 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, whichare 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, whichhas been variously interpreted as formerly a carbonatite and as a limestone. The evidence shows that the Borra rocks are meta-sedimentary. (C) 2002 Elsevier Science Ltd. All rights reserved.

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Documento generato il 04/06/20 alle ore 01:39:54