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Metamorphism and contrasting corona structures in Bolangir anorthositic rocks, Orissa

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Title Metamorphism and contrasting corona structures in Bolangir anorthositic rocks, Orissa
 
Creator PATEL, SC
FROST, BR
FAIZAN, I
DEY, R
GHOSH, TK
 
Subject evolution
india
minerals
complex
garnet
state
anorthosite
metamorphism
corona
decompression
bolangir
eastern ghats
 
Description Massif type anorthositic rocks in Bolangir area of the Eastern Chats belt contain garnet porphyroblasts, which are surrounded by reaction coronas. The corona usually comprises a vermicular intergrowth, which in one instance consists of radial orthopyroxene and anorthite-rich plagioclase, and in another of radial chlorite and anorthite-rich plagioclase. Some of the anorthositic rocks are layered with thin discontinuous mafic layers of clinopyroxene and biotite. Notable is the presence of retrograde ferro-anthophyllite in the mafic layers of some of the rocks. Thermobarometric calculations using assemblage in the orthopyroxene corona indicate decompression from minimum peak P-T condition of 8 kbar and 700 degreesC.
 
Publisher GEOLOGICAL SOC INDIA
 
Date 2011-07-30T05:32:04Z
2011-12-26T12:52:40Z
2011-12-27T05:39:24Z
2011-07-30T05:32:04Z
2011-12-26T12:52:40Z
2011-12-27T05:39:24Z
2001
 
Type Article
 
Identifier JOURNAL OF THE GEOLOGICAL SOCIETY OF INDIA, 57(1), 31-38
0016-7622
http://dspace.library.iitb.ac.in/xmlui/handle/10054/7861
http://hdl.handle.net/10054/7861
 
Language en