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• W2103642786 abstract "Research Article| February 01, 2005 Geochemical signatures of Archean to Early Proterozoic Maria-scale oceanic impact basins Andrew Y. Glikson Andrew Y. Glikson 1Research School of Earth Science, Australian National University, Canberra, ACT 0200, Australia Search for other works by this author on: GSW Google Scholar Author and Article Information Andrew Y. Glikson 1Research School of Earth Science, Australian National University, Canberra, ACT 0200, Australia Publisher: Geological Society of America Received: 03 Aug 2004 Revision Received: 12 Oct 2004 Accepted: 13 Oct 2004 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2005) 33 (2): 125–128. https://doi.org/10.1130/G21034.1 Article history Received: 03 Aug 2004 Revision Received: 12 Oct 2004 Accepted: 13 Oct 2004 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Andrew Y. Glikson; Geochemical signatures of Archean to Early Proterozoic Maria-scale oceanic impact basins. Geology 2005;; 33 (2): 125–128. doi: https://doi.org/10.1130/G21034.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Early Precambrian impact ejecta units—consisting of vapor-condensate spherules (microkrystites), microtektites, rip-up clasts and fragmental tsunami deposits—display high siderophile element (Ni, Co, platinum group elements [PGEs]) abundances and, in some instances, high V and Cr levels. The data allow an indirect insight into the composition of crustal regions from which the ejecta were derived, including the contribution of extraterrestrial components and the fractionation history of impact ejected liquid and vapor plumes. The absence of shocked quartz grains in recorded early Precambrian ejecta and the largely ferromagnesian compositions of the microkrystite spherules, except where heavily altered, are consistent with impacts into mafic to ultramafic crust. The PGE data coupled with stratigraphic data are used to estimate the PGE flux and the size of projectiles. PGE patterns relative to chondritic values are mostly depleted in volatile, low-boiling-point species (Au, Pd) and enriched in refractory species (Ir, Ru, Rh), with consequently lower than chondritic Pd/Ir and Pd/Pt ratios, providing a useful tracer of microkrystite-rich impact ejecta units. First approximations of asteroid and crater sizes based on Ir mass balance and on spherule size frequencies suggest impact by 20–30 km asteroids, scaled to oceanic impact basins several hundred kilometers in diameter. A high ratio of sima to sial crust during the Archean is consistent with positive εNd, εHf, and low 87Sr/86Srinitial. The evidence suggests post–3.8 Ga geotectonic systems consisting of small sialic granite-greenstone nuclei surrounded by extensive sima crust in which transient Maria-scale impact basins formed during 3.47, 3.26– 3.24, 2.63, 2.56, 2.50–2.47 Ga and as yet unrecorded impact events. You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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• W2103642786 title "Geochemical signatures of Archean to Early Proterozoic Maria-scale oceanic impact basins" @default.
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