Terrestrial and Martian weathering signatures of xenon components in shergottite mineral separates

摘要: Abstract– Xenon-isotopic ratios, step-heating release patterns, and gas concentrations of mineral separates from Martian shergottites Roberts Massif (RBT) 04262, Dar al Gani (DaG) 489, Shergotty, Elephant Moraine (EET) 79001 lithology B are reported. Concentrations atmospheric xenon similar in all meteorites, but more weathered samples contain terrestrial xenon. The distributions the atmospheres among minerals any one sample similar, suggesting similarities processes by which they were acquired. However, opaque maskelynite fractions, is released at higher temperatures than It suggested that both initially introduced weathering (low temperature alteration processes). component was redistributed shock, accounting for its current residence retentive sites. presence or absence detectable 129Xe atmosphere mafic may correspond to extent crustal contamination rock’s parent melt. Variable contents excess contrast with previously reported consistent 40Ar, distinct sources contributed these gases magma.