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Non-mass dependent chromium isotopic signatures have been successfully usedto determine the presence and identification of extra-terrestrial materials interrestrial impact rocks. Paleoproterozoic spherule layers from Greenland(Graenseso) and Russia (Zaonega), as well as some distal ejecta deposits (LakeSuperior region) from the Sudbury impact (1,849 +/- 0.3 Ma) event, have beenanalyzed for their Cr isotope compositions. Our results suggest that 1) thesedistal ejecta deposits are all of impact origin, 2) the Graenseso and Zaonegaspherule layers contain a distinct carbonaceous chondrite component, and arepossibly related to the same impact event, which could be Vredefort (2,023 +/-4 Ma) or another not yet identified large impact event from that of similarage, and 3) the Sudbury ejecta record a complex meteoritic signature, which isdifferent from the Graenseso and Zaonega spherule layers, and could indicatethe impact of a heterogeneous chondritic body.

Chromium isotope evidence in ejecta deposits for the nature of Paleoproterozoic impactors