Late-stage Fluids on the Ll Chondrite Parent Body: Evidence from Feldspar in the Ll4 Chondrites
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Ar-ar Impact Ages of Shocked Ll Chondrites
Introduction: Due to the relatively low closure temperature of feldspar, Ar-Ar ages of shocked meteorites typically record the age of an impact, not the formation age. Ar-Ar dating of lunar rocks has shown an increase in the impact rate around 3.9Ga [1], and many eucrites [2] and H chondrites [3] give similar ages, but with a larger spread than in the lunar case. Although only a small number of...
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