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Deccan Trap dioritic gabbros from the western Satpura-Tapi region

DSpace at IIT Bombay

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Title Deccan Trap dioritic gabbros from the western Satpura-Tapi region
 
Creator SHETH, HC
DUNCAN, RA
CHANDRASEKHARAM, D
MAHONEY, JJ
 
Subject mahabaleshwar
mantle
crust
 
Description Large (up to 3 m), xenolith-like boulders of dioritic gabbros are found in the Deccan basalts near Shahada and Shirpur in northern Maharashtra, along ENE-WSW-trending structural ridges. Both these dioritic gabbros have been dated by the Ar-40-Ar-39 incremental heating technique, and have yielded typical Deccan ages of similar to 66 Ma. These ages rule out the possibility of these rocks representing the basement crust of the area. The rocks from both ridges are petrographically, chemically and isotopically similar. In addition, their Sr-Nd-Pb isotopic ratios indicate that they are isotopically identical with some of the Mahabaleshwar Formation lavas of the Western Ghats Deccan. However, these rocks are more evolved chemically compared to typical Mahabaleshwar Formation lavas. These characteristics suggest that they are the likely products of fractional crystallization of a parental Mahabaleshwar-like magma generated in this region.
 
Publisher CURRENT SCIENCE ASSN
 
Date 2011-07-21T05:38:15Z
2011-12-26T12:51:54Z
2011-12-27T05:38:38Z
2011-07-21T05:38:15Z
2011-12-26T12:51:54Z
2011-12-27T05:38:38Z
1997
 
Type Article
 
Identifier CURRENT SCIENCE, 72(10), 755-757
0011-3891
http://dspace.library.iitb.ac.in/xmlui/handle/10054/5800
http://hdl.handle.net/10054/5800
 
Language en