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Impact-generated lunar highland rocks have high Ir and other noble metal concentrations. This Ir enrichment is produced by the admixture of a small amount of an undifferentiated meteoritic component. Similar high Ir concentrations are found in rocks from several large terrestrial impact craters. A compilation of all Ir analyses of terrestrial crater samples shows that there are now nine craters with a significant Ir anomaly (Ir > 1 ppb). Judging from the relative abundances of siderophile elements and the simultaneous enrichment of Cr, four of these craters were produced by chondritic projectiles. The Clearwater East impact melt, with an 8%...

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