Proterozoic to Ordovician geology and tectonic evolution of Rio de Janeiro State, SE-Brazil: insights on the central Ribeira Orogen from the new 1:400,000 scale geologic map
| Autor: | Sérgio Wilians de Oliveira Rodrigues, Natália Cota de Freitas, Julio Cesar Horta de Almeida, Davi Schulman Miguens, Raphael e Silva Girão, Luiz Guilherme do Eirado Silva, Caroline Peixoto, Célia Diana Ragatky, Márcio Antonio da Silva, Miguel Tupinambá, Claudio de Morisson Valeriano, Marcela Lobato, Monica Heilbron, Thais Monteiro |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
010506 paleontology
Brasiliano orogeny QE1-996.5 Gondwana Proterozoic Accretionary orogen Geology Ribeira belt 010502 geochemistry & geophysics 01 natural sciences Paleontology Basement (geology) Back-arc basin Passive margin Tonian continental margin Ordovician General Earth and Planetary Sciences 0105 earth and related environmental sciences Terrane |
| Zdroj: | Brazilian Journal of Geology, Vol 50, Iss 2 (2020) Brazilian Journal of Geology v.50 n.2 2020 Brazilian Journal of Geology Sociedade Brasileira de Geologia (SBGEO) instacron:SBGEO |
| ISSN: | 2317-4692 |
| Popis: | A comprehensive tectonic evolution of Proterozoic to Cambrian rocks that integrate the crystalline basement of Rio de Janeiro State, based on the new geological map, is presented. The map combines detailed geological data integrated to a 1:400.000 scale and new geochemical and geochronology data to characterize the distinct terranes amalgamated during three pulses of the Brasiliano orogeny. The Occidental terrane comprises the Tonian to Late Cryogenean passive margin of the São Francisco paleocontinent, including reworked cratonic basement. At the same period, two magmatic arc systems were developed outboard: The Continental Inner arc system represented by the dismembered terranes (Paraíba do Sul, Embú, and Cambuci domain) integrated now in the Central Superterrane: and the Intra-oceanic Outer Arc System, the Oriental Terrane, developed from 860 to 620 Ma. Related active basins were detected in association with the two arc systems that collided at ca. 620 - 595 and 605 - 550 Ma against the São Francisco passive margin. A later collision episode at ca. 535 to 510 Ma brought the Cabo Frio Terrane (Angola tip) and closed the Búzios back-arc basin. Finally, the collapse of the orogenic belt, probably related to slab detachment and asthenosphere upwelling marks transition to Gondwana stabilization. |
| Databáze: | OpenAIRE |
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