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Co-existent cristobalite and iridium at 65 Ma, Anjar Intertrappeans, Kachchh, western India

DSpace at IIT Bombay

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Title Co-existent cristobalite and iridium at 65 Ma, Anjar Intertrappeans, Kachchh, western India
 
Creator SANT, DA
MATHEW, G
KHADKIKAR, AS
GOGTE, V
GUNDURAO, TK
 
Subject cretaceous-tertiary boundary
deccan volcanism
extinction
sediments
province
iceland
events
ocean
traps
area
k/t
deccan
anjar
cristobalite
mineralogy
meteorite
iridium
 
Description Cristobalite (a high-temperature low-pressure silica polymorph) is reported for the first time from the 65 Ma Anjar intertrappean deposits. It is characterized by a sharp, intense peak (X-ray diffraction) at d-spacing value 4.055Angstrom, followed by a moderate peak at 2.489Angstrom. Its presence is confirmed through Fourier Transform Infrared spectroscopy with absorption bands at 620 and 380 cm(-1). The distribution of volcanic cristobalite coincides with the distribution of iridium in the deposits. When taken in tandem with the absence of shocked quartz, spinels, stishovite and other signatures of an impact origin, this co-existence suggests that the iridium at Anjar is probably of volcanic origin. (C) 2003 Elsevier Ltd.
 
Publisher ACADEMIC PRESS LTD ELSEVIER SCIENCE LTD
 
Date 2011-07-12T20:31:06Z
2011-12-26T13:02:50Z
2011-12-27T05:50:01Z
2011-07-12T20:31:06Z
2011-12-26T13:02:50Z
2011-12-27T05:50:01Z
2003
 
Type Article
 
Identifier CRETACEOUS RESEARCH, 24(2), 105-110
0195-6671
http://dx.doi.org/10.1016/S0195-6671(03)00028-4
http://dspace.library.iitb.ac.in/xmlui/handle/10054/3568
http://hdl.handle.net/10054/3568
 
Language en