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Petrogenetic significance of ferro-enstatite orthopyroxene in basaltic dikes from the Tapi rift, Deccan flood basalt province, India

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Title Petrogenetic significance of ferro-enstatite orthopyroxene in basaltic dikes from the Tapi rift, Deccan flood basalt province, India
 
Creator CHANDRASEKHARAM, D
VASELLI, O
SHETH, HC
KESHAV, S
 
Subject earth science
earth (planet)
geology
crystallization
temperature scales
 
Description Some basaltic dikes from the Tapi rift in the Deccan flood basalt province, India, contain abundant clusters of prismatic quench crystals of ferro-enstatite orthopyroxene (Fe39–42Mg53–57Ca2–4). Such profuse orthopyroxene clusters are not yet known from any other flood basalt province in the world. Based on petrography, mineral chemistry and whole-rock chemistry, we conclude that these crystals are formed due to assimilation of shale by Deccan basalt magma. This interpretation is consistent with the known bedrock geology of the area. These quench crystals constitute the first direct, petrographic evidence for crustal contamination in the Deccan province. The liquidus temperature for the dikes is estimated at 1220±10°C, with the crystallization temperature of the orthopyroxene at 1080°C or less.
 
Publisher Elsevier
 
Date 2009-06-20T05:59:55Z
2011-12-08T08:07:42Z
2011-12-26T13:02:37Z
2011-12-27T05:49:10Z
2009-06-20T05:59:55Z
2011-12-08T08:07:42Z
2011-12-26T13:02:37Z
2011-12-27T05:49:10Z
2000
 
Type Article
 
Identifier Earth and Planetary Science Letters 179(3-4), 469-476
10.1016/S0012-821X(00)00131-X
ISSN: 0012-821X
http://hdl.handle.net/10054/1534
http://dspace.library.iitb.ac.in/xmlui/handle/10054/1534
 
Language en