Devolatilization or melting of carbonates at Meteor Crater, AZ?

Autor:	M. Evans, P. B. Niles, P. D. Archer, Michael E. Zolensky, F. Hörz
Rok vydání:	2015
Předmět:	Calcite Meteor (satellite) Geochemistry Mineralogy Isotopes of oxygen chemistry.chemical_compound Geophysics chemistry Meteorite Impact crater Space and Planetary Science Hypervelocity Quartz Geology EMPA
Zdroj:	Meteoritics & Planetary Science. 50:1050-1070
ISSN:	1086-9379
DOI:	10.1111/maps.12453
Popis:	We have investigated the carbonates in the impact melts and in a monolithic clast of highly shocked Coconino sandstone of Meteor Crater, AZ to evaluate whether melting or devolatilization is the dominant response of carbonates during high-speed meteorite impact. Both melt- and clast-carbonates are calcites that have identical crystal habits and that contain anomalously high SiO2 and Al2O3. Also, both calcite occurrences lack any meteoritic contamination, such as Fe or Ni, which is otherwise abundantly observed in all other impact melts and their crystallization products at Meteor Crater. The carbon and oxygen isotope systematics for both calcite deposits suggest a low temperature environment (
Databáze:	OpenAIRE
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