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- W4324283404 abstract "Geological mapping and isotopic and geochemical studies of well-preserved Archaean greenstone belts in the Pilbara craton and Barberton terrain uncovered biogenic fossils allowing detailed insights into early evolution of life. More than 15 impact ejecta units up to 3.46 Ga-old intercalated with volcanic and sediments have been documented, with clusters about 3.460 Ga, 3.3–3.227 Ga and 2.63–2.48 Ga. The evolution of volcanic greenstone belts can be interpreted in part in terms of large asteroid impacts and their consequences. At the base of Archaean supracrustal sequences occur peridotitic lavas, pillowed Mg-rich basalts, intrusive dolerite and gabbro intercalated with thin units of tuff and chert, representing relics of ancient mafic-ultramafic crust. The presence of mafic/ultramafic enclaves within granitoid gneiss, and U–Pb and Sm–Nd evidence for older sialic precursors of meta-sediments, has led to contrasting interpretations of the evolution of Archaean terrains. A concentration of large impacts during 2.63–2.48 Ga potentially accounts for peak magmatic events toward the end of the Archaean era." @default.
- W4324283404 created "2023-03-16" @default.
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- W4324283404 date "2023-01-01" @default.
- W4324283404 modified "2023-09-28" @default.
- W4324283404 title "The Early Earth Crust" @default.
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- W4324283404 doi "https://doi.org/10.1007/978-3-031-23709-6_3" @default.
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