Geological and geochemical record of 3400-million-year-old terrestrial meteorite impacts

Details Geological and geochemical record of 3400-million-year-old terrestrial meteorite impacts Geological and geochemical record of 3400-million-year-old terrestrial meteorite impacts

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989sci...245..959l&link_type=abstract

Science (ISSN 0036-8075), vol. 245, Sept. 1, 1989, p. 959-962. Research supported by the U.S. Navy.

Other

51

Geochemistry, Geochronology, Hypervelocity Impact, Lithology, Meteorite Craters, Abundance, Geology, Iridium, Meteoritic Composition, Spherules, Earth, Impacts, Meteorites, Spherules, Samples, Terrestrial, Composition, Barberton Greenstone Belt, Origin, Formation, Comparisons, Geochemistry, Field Studies, Iridium, Photographs, Laboratory Studies, Stratigraphy

Scientific paper

Beds of sand-sized spherules in the 3400-million-year-old Fig Tree Group, Barberton Greenstone belt, South Africa, formed by the fall of quenched liquid silicate droplets into a range of shallow- to deep-water depositional environments. The regional extent of the layers, their compositional complexity, and lack of included volcanic debris suggest that they are not products of volcanic activity. The layers are greatly enriched in iridium and other platinum group elements in roughly chondritic proportions. Geochemical modeling based on immobile element abundances suggests that the original average spherule composition can be approximated by a mixture of fractionated tholeiitic basalt, komatiite, and CI carbonaceous chondrite. The spherules are thought to be the products of large meteorite impacts on the Archean earth.

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