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Eclogite xenoliths from Wajrakarur kimberlites, southern India

DSpace at IIT Bombay

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Title Eclogite xenoliths from Wajrakarur kimberlites, southern India
 
Creator PATEL, SC
RAVI, S
THAKUR, SS
RAO, TK
SUBBARAO, KV
 
Subject andhra-pradesh
anantapur district
high-pressures
upper mantle
garnet
clinopyroxene
chemistry
yakutia
pipe
geothermobarometry
 
Description Mineralogical characteristics of eclogite xenoliths from three kimberlite pipes (KL2, P2 and P10) of the Proterozoic Wajrakarur kimberlite field of southern India have been studied. In a rare sample of enstatite eclogite from the KL2 pipe garnet contains microscopic triangular arrays of needles or blebs of omphacite, enstatite and rutile consistent with an origin by exsolution parallel to the isometric form {111}. Discrete omphacite grains in the sample contain exsolved needles or blebs of enstatite and garnet. Kyanite eclogites are abundant in the KL2 pipe which occasionally show a secondary ring of pure celsian around kyanite grains. Omphacite Na2O contents in the eclogites of the KL2 and P2 pipes are typically between 3 and 6 wt%, and garnet has widely variable composition with end member ranges of Prp22-81Grs0-47AImlO30Sps0-1Adr0-5Uv0-3. Eclogites of the P10 pipe comprise chromian omphacite and garnet. Phase relations in the ACF projection exhibit systematic increase of the Ca-Tschermak's component in omphacite from enstatite eclogite through biminerallic eclogite to kyanite eclogite. Garnet-clinopyroxene Fe-Mg geothermometry yields temperatures mostly in the range of 900-1100 degrees C. A formerly supersilicic nature of garnet in enstatite eclogite as inferred from exsolution mineralogy indicates minimum peak pressure of 5 GPa.
 
Publisher SPRINGER WIEN
 
Date 2011-10-22T12:46:29Z
2011-12-15T09:10:55Z
2011-10-22T12:46:29Z
2011-12-15T09:10:55Z
2006
 
Type Article; Proceedings Paper
 
Identifier MINERALOGY AND PETROLOGY,88,363-380
0930-0708
http://dx.doi.org/10.1007/s00710-006-0150-8
http://dspace.library.iitb.ac.in/xmlui/handle/10054/14900
http://hdl.handle.net/100/1738
 
Source 7th International Eclogite Conference,Seggau, AUSTRIA,JUL 03-09, 2005
 
Language English