Ediacaran 2,500-km-long synchronous deep continental subduction in the West Gondwana Orogen
| Autor: | Miguel Angelo Stipp Basei, Renaud Caby, Joerg Hermann, Carlos Eduardo Ganade de Araujo, Daniela Rubatto, Umberto G. Cordani |
|---|---|
| Přispěvatelé: | Geological Survey of Brazil, Rio de Janeiro, Australian National University (ANU), Instituto de Geociências, Universidade de São Paulo, Géosciences Montpellier, Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Université des Antilles (UA)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
010504 meteorology & atmospheric sciences
Continental collision [SDE.MCG]Environmental Sciences/Global Changes General Physics and Astronomy Metamorphism 010502 geochemistry & geophysics 01 natural sciences General Biochemistry Genetics and Molecular Biology Paleontology GONDWANA 550 Earth sciences & geology Suture (geology) 0105 earth and related environmental sciences [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics geography Multidisciplinary geography.geographical_feature_category Subduction General Chemistry 500 Science west gondwana Tectonics Craton Gondwana Mountain formation Geology |
| Zdroj: | Nature Communications Nature Communications, Nature Publishing Group, 2014, 5, pp.5198. ⟨10.1038/ncomms6198⟩ Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| ISSN: | 2041-1723 |
| DOI: | 10.1038/ncomms6198⟩ |
| Popis: | International audience; 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. |
| Databáze: | OpenAIRE |
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