Results 181 to 190 of about 5,261 (211)
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Precambrian Research, 2017
Abstract We document for the first time the presence of a Paleoproterozoic ophiolitic melange in the Archean–Paleoproterozoic Kongling Complex in the northern Huangling Dome, Yangtze craton, South China. Detailed field mapping, petrographic, geochronological and geochemical studies reveal that the melange consists of a suite of amphibolite facies ...
Qingsen Han +7 more
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Abstract We document for the first time the presence of a Paleoproterozoic ophiolitic melange in the Archean–Paleoproterozoic Kongling Complex in the northern Huangling Dome, Yangtze craton, South China. Detailed field mapping, petrographic, geochronological and geochemical studies reveal that the melange consists of a suite of amphibolite facies ...
Qingsen Han +7 more
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Archean-Paleoproterozoic transition: The Indian perspective
Earth-Science Reviews, 2019Abstract India has perhaps the richest Paleoarchean to Paleoproterozoic crustal components on Earth ( Miller et al., 2018 ). Notwithstanding this, much of the Indian subcontinent remains unexplored compared to other ancient cratons in North America, Australia, Brazil and Africa.
Rajat Mazumder +2 more
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Breakup of a Paleoproterozoic Supercontinent
Gondwana Research, 2002Abstract If a Paleoproterozoic supercontinent broke up between 1.6 and 1.5 Ga, the distribution of sutures shows that the breakup was not complete. At least two large cratons, Atlantica (Amazonia, Congo, West Africa and probably North Africa and Rio de la Plata) and Arctica (Laurentia, Siberia, Baltica, North Australia and North China), survived the ...
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A strongly oxidizing Paleoproterozoic era
Science, 2018Early Earth Two billion years ago, marine sulfate concentrations were around one-third as high as modern ones, constituting an oxidizing capacity equivalent to more than 20% of that of the modern ocean-atmosphere system. Blattler et al.
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The Paleoproterozoic Eastern Bahia Orogenic Domain
2016The Paleoproterozoic Eastern Bahia orogenic domain occupies an approximately 200 km-wide area in the northern Sao Francisco craton, located between the Atlantic coast and the interior plateau of Bahia state known as the Chapada Diamantina. Together with its African counterpart, the West Central African belt of Gabon, the Eastern Bahia orogenic domain ...
Johildo Salomão Figueirêdo Barbosa +1 more
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Precambrian Research, 2011
Abstract Geochemical, Sm–Nd isotopic, and U–Pb–Lu–Hf zircon analyses reveal the sedimentary succession formerly recognised as the Hutchison Group consists of three temporally and isotopically distinct groups, divided by a crustal-scale shear zone (Kalinjala Mylonite Zone).
Szpunar, M. +4 more
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Abstract Geochemical, Sm–Nd isotopic, and U–Pb–Lu–Hf zircon analyses reveal the sedimentary succession formerly recognised as the Hutchison Group consists of three temporally and isotopically distinct groups, divided by a crustal-scale shear zone (Kalinjala Mylonite Zone).
Szpunar, M. +4 more
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Paleoproterozoic Birimian Geology for sustainable development
Journal of African Earth Sciences, 2018The aim of this volume namely “Paleoproterozoic Birimian Geology of West African Craton for Sustainable Development” is the fruit of IGCP638 meetings in Senegal and Morocco. It is the characterization of ore deposits which is specific to geological conditions (P, T, t) depending on the rheology of rocks, their emplacement mode and of their tectonic and
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Primary hematite in Neoarchean to Paleoproterozoic oceans
Geological Society of America Bulletin, 2015Banded iron formations (BIFs) are ironand silica-rich chemical sedimentary rocks formed throughout the Archean and Paleoproterozoic Eras. The presence of hematite (Fe2O3) and magnetite (Fe3O4) in BIFs has led to the widespread assumption that Fe(II) oxidation must have occurred in the ancient oceans via either a biological or chemical mechanism ...
Si Sun +3 more
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Halogen composition of Paleoproterozoic oceans
Goldschmidt2023 abstracts, 2023Ray Burgess +3 more
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