THE AGE OF TISSINT: Sm-Nd & Rb-Sr ISOTOPE SYSTEMATICS OF A MARTIAN METEORITE FALL
نویسندگان
چکیده
Introduction: The recently acquired meteorite Tissint is the first recognized fall of a depleted shergottite. Other such shergottites were found in the hot deserts (e.g., NWA 1195, Dhofar 019, DAG 476) or in the Antarctic cold desert (e.g., QUE 94201, Y980459) and, in many cases, have disturbed isotopic systematics due to terrestrial contamination [1-4]. Tissint represents the freshest sample of this important group of martian meteorites and thus provides an unprecedented opportunity to study pristine material derived from the depleted martian mantle. This work investigates the Rb-Sr, Sm-Nd and Sm-Nd systematics of Tissint to determine its crystallization age and to assess the nature of its source regions by comparison to other known martian meteorites.
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