Ediacaran 2,500-km-long synchronous deep continental subduction in the West Gondwana Orogen.
Identifieur interne : 001F13 ( Ncbi/Curation ); précédent : 001F12; suivant : 001F14Ediacaran 2,500-km-long synchronous deep continental subduction in the West Gondwana Orogen.
Auteurs : Carlos E. Ganade De Araujo [Brésil] ; Daniela Rubatto [Australie] ; Joerg Hermann [Australie] ; Umberto G. Cordani [Brésil] ; Renaud Caby [France] ; Miguel A S. Basei [Brésil]Source :
- Nature communications [ 2041-1723 ] ; 2014.
Abstract
The deeply eroded West Gondwana Orogen is a major continental collision zone that exposes numerous occurrences of deeply subducted rocks, such as eclogites. The position of these eclogites marks the suture zone between colliding cratons, and the age of metamorphism constrains the transition from subduction-dominated tectonics to continental collision and mountain building. Here we investigate the metamorphic conditions and age of high-pressure and ultrahigh-pressure eclogites from Mali, Togo and NE-Brazil and demonstrate that continental subduction occurred within 20 million years over at least a 2,500-km-long section of the orogen during the Ediacaran. We consider this to be the earliest evidence of large-scale deep-continental subduction and consequent appearance of Himalayan-scale mountains in the geological record. The rise and subsequent erosion of such mountains in the Late Ediacaran is perfectly timed to deliver sediments and nutrients that are thought to have been necessary for the subsequent evolution of sustainable life on Earth.
DOI: 10.1038/ncomms6198
PubMed: 25319269
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Ganade De Araujo</name><affiliation wicri:level="4"><nlm:affiliation>1] Geological Survey of Brazil, Avenida Pasteur 404, CEP 22290-240, Rio de Janeiro, Brazil [2] Instituto de Geociências, Universidade de São Paulo, Rua do Lago, 562, CEP 05508-080, São Paulo, Brazil.</nlm:affiliation><country xml:lang="fr">Brésil</country><wicri:regionArea>1] Geological Survey of Brazil, Avenida Pasteur 404, CEP 22290-240, Rio de Janeiro, Brazil [2] Instituto de Geociências, Universidade de São Paulo, Rua do Lago, 562, CEP 05508-080, São Paulo</wicri:regionArea><placeName><settlement type="city">São Paulo</settlement><region type="state">État de São Paulo</region><settlement type="city">São Paulo</settlement></placeName><orgName type="university">Université de São Paulo</orgName></affiliation></author><author><name sortKey="Rubatto, Daniela" sort="Rubatto, Daniela" uniqKey="Rubatto D" first="Daniela" last="Rubatto">Daniela Rubatto</name><affiliation wicri:level="1"><nlm:affiliation>Research School of Earth Sciences, Australian National University, Mills Road, Canberra 2610, Australia.</nlm:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>Research School of Earth Sciences, Australian National University, Mills Road, Canberra 2610</wicri:regionArea><wicri:noRegion>Canberra 2610</wicri:noRegion></affiliation></author><author><name sortKey="Hermann, Joerg" sort="Hermann, Joerg" uniqKey="Hermann J" first="Joerg" last="Hermann">Joerg Hermann</name><affiliation wicri:level="1"><nlm:affiliation>Research School of Earth Sciences, Australian National University, Mills Road, Canberra 2610, Australia.</nlm:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>Research School of Earth Sciences, Australian National University, Mills Road, Canberra 2610</wicri:regionArea><wicri:noRegion>Canberra 2610</wicri:noRegion></affiliation></author><author><name sortKey="Cordani, Umberto G" sort="Cordani, Umberto G" uniqKey="Cordani U" first="Umberto G" last="Cordani">Umberto G. 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Bataillon 34095, Montpellier CEDEX 5, France.</nlm:affiliation><country xml:lang="fr">France</country><wicri:regionArea>Géosciences Montpellier, Université de Montpellier II, Place E. Bataillon 34095, Montpellier CEDEX 5</wicri:regionArea><wicri:noRegion>34095, Montpellier CEDEX 5</wicri:noRegion><wicri:noRegion>34095, Montpellier CEDEX 5</wicri:noRegion></affiliation></author><author><name sortKey="Basei, Miguel A S" sort="Basei, Miguel A S" uniqKey="Basei M" first="Miguel A S" last="Basei">Miguel A S. Basei</name><affiliation wicri:level="4"><nlm:affiliation>Instituto de Geociências, Universidade de São Paulo, Rua do Lago, 562, CEP 05508-080, São Paulo, Brazil.</nlm:affiliation><country xml:lang="fr">Brésil</country><wicri:regionArea>Instituto de Geociências, Universidade de São Paulo, Rua do Lago, 562, CEP 05508-080, São Paulo</wicri:regionArea><placeName><settlement type="city">São Paulo</settlement><region type="state">État de São Paulo</region><settlement type="city">São Paulo</settlement></placeName><orgName type="university">Université de São Paulo</orgName></affiliation></author></analytic><series><title level="j">Nature communications</title><idno type="eISSN">2041-1723</idno><imprint><date when="2014" type="published">2014</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The deeply eroded West Gondwana Orogen is a major continental collision zone that exposes numerous occurrences of deeply subducted rocks, such as eclogites. The position of these eclogites marks the suture zone between colliding cratons, and the age of metamorphism constrains the transition from subduction-dominated tectonics to continental collision and mountain building. Here we investigate the metamorphic conditions and age of high-pressure and ultrahigh-pressure eclogites from Mali, Togo and NE-Brazil and demonstrate that continental subduction occurred within 20 million years over at least a 2,500-km-long section of the orogen during the Ediacaran. We consider this to be the earliest evidence of large-scale deep-continental subduction and consequent appearance of Himalayan-scale mountains in the geological record. The rise and subsequent erosion of such mountains in the Late Ediacaran is perfectly timed to deliver sediments and nutrients that are thought to have been necessary for the subsequent evolution of sustainable life on Earth.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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