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• W1987999922 endingPage "798" @default.
• W1987999922 startingPage "785" @default.
• W1987999922 abstract "Criteria allowing diagnostic identification of asteroid and comet impact fallout units (impactites), including fragmental ejecta, microtektites and microkrystite spherules (impact vapour condensates) comprise: (i) unique mineral fallout phases—shocked quartz grains, coesite and nano-diamonds; (ii) unique intra-microkrystite phases—Ni-chromite, Ni-nanonuggets and Ir-nanonuggets, condensed from vapour enriched in meteoritic components; (iii) geochemical features such as high abundance and unique ratios of the platinum group (PGE) and other siderophile elements (Ni, Co); (iv) meteoritic isotopic ratios including ε53Cr (53Cr/52Cr), ε54Cr (54Cr/52Cr), ε182W (182W/183W) or (182W/184W), εOs (187Os/188Os), ε17O (17O/16O), ε18O (18O/16O); and (v) cometary seeding of 3He/4He and racemic organic molecules (AIB) and possibly fullerenes (C60). Relic nickel chromites and metasomatically derived sulfides may contain PGE nanonuggets. Alteration, burial metamorphism and open-system mobility of uranium in hydrous terrestrial environments renders preservation of meteoritic ε207Pb (207Pb/204Pb) and ε206Pb (206Pb/204Pb) values unlikely. Where least affected, PGE patterns of microkrystites and microtektite-bearing impact fallout units (impactites) are the reverse of terrestrial PGE patterns, including low Pd/Pt ratios, which provide some of the more readily identified and analytically practical criteria for identifying a meteoritic component. εCr – εCr relations in Barberton Greenstone Belt impact fallout units (3.26 – 3.24 Ga) identify a carbonaceous chondrite composition of the parental asteroids. PGE abundances (Ir, Pt) and εCr isotope values allow mass-balance estimates of parental projectiles in the order of 20 – 30 km diameter. Ir and Pt mass-balance estimates correspond to projectiles ∼20 km in diameter or larger in the Pilbara Craton for the JIL (> 2.63 Ga) and DGS4 (2.5 – 2.47 Ga) impact fallout units. The Ni, Co and Cr enriched composition of most Precambrian microkrystite spherules militates for mafic/ultramafic target crust which, coupled with the estimated diameter of the ensuing craters, implies the existence of maria-scale impact basins in oceanic-type crustal regions during the Archaean and Palaeoproterozoic." @default.
• W1987999922 created "2016-06-24" @default.
• W1987999922 creator A5068395116 @default.
• W1987999922 date "2005-09-01" @default.
• W1987999922 modified "2023-09-26" @default.
• W1987999922 title "Geochemical and isotopic signatures of Archaean to Palaeoproterozoic extraterrestrial impact ejecta/fallout units" @default.
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• W1987999922 doi "https://doi.org/10.1080/08120090500170328" @default.
• W1987999922 hasPublicationYear "2005" @default.
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