Early Precambrian Earth history: Plate and plume tectonics and extraterrestrial controls |
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| Institution: | 1. A.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia;2. V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia;3. Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia;1. Department of Geology & Geophysics, Indian Institute of Technology Kharagpur, 721302 West Bengal, India;2. Vale Institute of Technology, Boaventura da Silva, 66055-090 Belém, Pará, Brazil;3. School of Earth, Ocean and Climate Sciences, Indian Institute of Technology, Bhubaneswar 751013, India;4. Department of Earth & Atmospheric Science, National Institute of Technology Rourkela, 769008 Odisha, India;1. CNR, Consiglio Nazionale delle Ricerche, Istituto di Geoscienze e Georisorse, U.O. Firenze, Via G. La Pira, 4, 50121 Florence, Italy;2. Bureau of Economic Geology, The University of Texas at Austin, University Station, Box X, Austin, TX 78713, USA;1. Centre de Recherches Petrographiques et Geochimiques, Lorraine University, BP20, 15 rue Notre Dame des Pauvres, F-54501 Vandoeuvre-les-Nancy Cedex, France;2. Dipartimento di Scienze della Terra, Sapienza University, P.le A. Moro, 5, 00185 Roma, Italy;3. Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, 00143 Roma, Italy;4. School of Physical Sciences, Discipline of Earth Sciences, University of Tasmania, Hobart, Tasmania 7001, Australia |
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| Abstract: | The Hadean and Archean geologic history of the Earth is discussed in the context of available knowledge from different sources: space physics and comparative planetology; isotope geochronology; geology and petrology of Archean greenstone belts (GB) and tonalite-trondhjemite-granodiorite (TTG) complexes; and geodynamic modeling review to analyse plate-tectonic, plume activity, and impact processes. Correlation between the age peaks of terrestrial Hadean-Early Archean zircons and late heavy bombardment events on the Moon, as well as the Hf isotope composition of zircons indicating their mostly mafic sources, hint to an important role of impact processes in the Earth’s history between 4.4 and 3.8 Ga. The earliest continental crust (TTG complexes) formed at 4.2 Ga (Acasta gneisses), while its large-scale recycling left imprint in Hf isotope signatures after 3.75 Ga. The associations and geochemistry of rocks suggest that Archean greenstone belts formed in settings of rifting, ocean floor spreading, subduction, and plume magmatism generally similar to the present respective processes. The Archean history differed in the greater extent of rocks derived from mantle plumes (komatiites and basalts), boninites, and adakites as well as in shorter subduction cycles recorded in alternation of typical calc-alkaline andesite-dacite-rhyolite and adakite series that were generated in a hotter mantle with more turbulent convection and unsteady subduction. The Archean is interpreted as a transient period of small plate tectonics. |
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