CORDIS OpenAire u:cris Datacite Sygma UnpayWall Crossref HAL Descartes Microsoft Academic Graph arXiv.org e-Print Archive European Union Open Data Portal Earth and Planetary Science Letters Open Access 2016-12-22 2016-01-01 2020-08-20 Non-mass dependent chromium isotopic signatures have been successfully used to determine the presence and identification of extra-terrestrial materials in terrestrial impact rocks. Paleoproterozoic spherule layers from Greenland (Graenseso) and Russia (Zaonega), as well as some distal ejecta deposits (Lake Superior region) from the Sudbury impact (1,849 +/- 0.3 Ma) event, have been analyzed for their Cr isotope compositions. Our results suggest that 1) these distal ejecta deposits are all of impact origin, 2) the Graenseso and Zaonega spherule layers contain a distinct carbonaceous chondrite component, and are possibly 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 similar age, and 3) the Sudbury ejecta record a complex meteoritic signature, which is different from the Graenseso and Zaonega spherule layers, and could indicate the impact of a heterogeneous chondritic body. TERRESTRIAL KARELIA impact ejecta FOS: Physical sciences 01 natural sciences METEORITIC COMPONENTS SOLAR-SYSTEM [SDU.STU.PL]Sciences of the Universe [physics]/Earth Sciences/Planetology [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry SOUTH GREENLAND [SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry GEOCHEMICAL EVIDENCE Vredefort Sudbury 0105 earth and related environmental sciences Earth and Planetary Astrophysics (astro-ph.EP) crater KETILIDIAN OROGEN meteorite EARLY EARTH 105105 Geochemistry EVENT 13. Climate action chromium isotopes [SDU.STU.PL] Sciences of the Universe [physics]/Earth Sciences/Planetology 105105 Geochemie SPHERULES Astrophysics - Earth and Planetary Astrophysics Christian Koeberl, Christian Koeberl, Christa Göpel, Bérengère Mougel, Frédéric Moynier, Frédéric Moynier, 2017-02-01 journalpaper Non-mass dependent chromium isotopic signatures have been successfully used to determine the presence and identification of extra-terrestrial materials in terrestrial impact rocks. Paleoproterozoic spherule layers from Greenland (Graenseso) and Russia (Zaonega), as well as some distal ejecta deposits (Lake Superior region) from the Sudbury impact (1,849 +/- 0.3 Ma) event, have been analyzed for their Cr isotope compositions. Our results suggest that 1) these distal ejecta deposits are all of impact origin, 2) the Graenseso and Zaonega spherule layers contain a distinct carbonaceous chondrite component, and are possibly 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 similar age, and 3) the Sudbury ejecta record a complex meteoritic signature, which is different from the Graenseso and Zaonega spherule layers, and could indicate the impact of a heterogeneous chondritic body. Chromium isotope evidence in ejecta deposits for the nature of Paleoproterozoic impactors 10.1016/j.epsl.2016.12.008 https://doi.org/10.1016/j.epsl.2016.12.008