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Perhaps the recent silica found on the Moon highlands resulted from the extreme conditions of temperature and pressure of planetesimal collision with proto-earth. Can covalent bonds be broken at high temperatures, allowing oxygen incorporation in an anaerobic environment? What is the highest experimental temperature for silica formation in an anaerobic environment?
http://www.eurekalert.org/pub_releases/2010-09/uoc--srn091510.php
http://www.eurekalert.org/pub_releases/2010-09/uoc--srn091510.php