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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/3568

Title: Co-existent cristobalite and iridium at 65 Ma, Anjar Intertrappeans, Kachchh, western India
Authors: SANT, DA
MATHEW, G
KHADKIKAR, AS
GOGTE, V
GUNDURAO, TK
Keywords: cretaceous-tertiary boundary
deccan volcanism
extinction
sediments
province
iceland
events
ocean
traps
area
Issue Date: 2003
Publisher: ACADEMIC PRESS LTD ELSEVIER SCIENCE LTD
Citation: CRETACEOUS RESEARCH, 24(2), 105-110
Abstract: 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.
URI: 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
ISSN: 0195-6671
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