Claudio Morisson Valeriano

Universidade do Estado do Rio de Janeiro

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Mônica Heilbron

Universidade do Estado do Rio de Janeiro

Miguel Tupinambá

Universidade do Estado do Rio de Janeiro

Júlio Almeida

Universidade do Estado do Rio de Janeiro

Rodson de Abreu Marques

Universidade Federal de Ouro Preto

Rodrigo A. Nascimento

Universidade Federal Fluminense

Lucas Pequeño Gouvêa

Universidade Federal do Rio de Janeiro

Antônio Carlos Pedrosa‐Soares

Universidade Federal de Minas Gerais

Caroline Cibele Vieira Soares

Centro Hospitalar Tondela-Viseu

Gláucia Queiroga

Universidade Federal de Ouro Preto

Emmanoel Vieira Silva-Filho

Universidade Federal Fluminense

Cooperative Institutions

Universidade Federal de Ouro Preto

Universidade Federal Fluminense

Instituto de Geociencias

Universidade do Estado do Rio de Janeiro

Universidade Federal do Rio de Janeiro

National Council for Scientific and Technological Development

Universidade Federal de Minas Gerais

Universidade de São Paulo

Universidade Federal do Espírito Santo

Sociedade Brasileira de Geofísica

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The Ediacaran Rio Doce magmatic arc in the Araçuaí – Ribeira boundary sector, southeast Brazil: Lithochemistry and isotopic (Sm–Nd and Sr) signatures

Journal of South American Earth Sciences (2020)

Caroline Cibele Vieira Soares Gláucia Queiroga Antônio Carlos Pedrosa‐Soares Lucas Pequeño Gouvêa Claudio Morisson Valeriano

Diorite

Continental arc

Fractional crystallization (geology)

Island arc

Felsic

10.1016/j.jsames.2020.102880

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Citations (13)

From collision to extension: The roots of the southeastern continental margin of Brazil

Geophysical monograph (2000)

Mônica Heilbron Webster Ueipass Mohriak Claudio Morisson Valeriano E. J. Milani Júlio Almeida

The South Atlantic Meso-Cenozoic continental margins are located in regions characterized by a long-lived history of Proterozoic extension, structural inversion and compressional remobilization of basement and supracrustal rocks. The roots of the present-day southeastern Brazilian continental margin (e.g. Santos and Campos basins) are associated with terranes directly affected by the Brasiliano orogenic collage. This event was responsible for the Ribeira fold belt, which is characterized by compressional, metamorphic and magmatic episodes from Late Precambrian to the earliest Paleozoic. The initial phases of subsidence of the intracratonic Parana basin, located west of the Ribeira fold belt, correspond to early Paleozoic siliciclastic rocks deposited in depocenters that were probably controlled by Brasiliano fabrics. The basin-forming stress fields may be related to the lithospheric convergence between Panthalassa oceanic crust and cratonic blocks of western Gondwana. The last phase of subsidence in the Parana basin is marked by Late Jurassic / Early Cretaceous tholeiitic continental flood basalts. These basalts heralded the breakup of Gondwana. They were also deposited on the Precambrian basement offshore, and are believed to be part of the rift succession. The breakup of western Gondwana and the onset of a new phase of plate divergence in the South Atlantic were marked by thick wedges of seaward-dipping reflectors near the incipient oceanic-ridge spreading center. Subsequently, a few episodes of intraplate tectonic and magmatic activity are also possibly related to compressional stresses resulting from subduction in the Andean margin and ridge push in the mid-Atlantic spreading ridge.

Continental Margin

Supercontinent

Passive margin

10.1029/gm115p0001

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Citations (167)

The Ribeira Belt

Regional geology reviews (2016)

Mônica Heilbron André Ribeiro Claudio Morisson Valeriano Fabio Vito Pentagna Paciullo Júlio Almeida

Back-arc basin

Basement

Continental Margin

Continental arc

Passive margin

10.1007/978-3-319-01715-0_15

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Citations (46)

REE Anomalies Changes in Bottom Sediments Applied in the Western Equatorial Atlantic Since the Last Interglacial

Frontiers in Marine Science (2022)

Thiago Andrade Sousa Igor M. Venâncio Eduardo Duarte Marques Thiago S. Figueiredo Rodrigo A. Nascimento

We reconstruct paleoredox conditions in the Western Equatorial Atlantic (WEA) over the glacial-interglacial cycle (~130 ka) by using new high-resolution REEs data and their anomalies from a marine sediment core (GL-1248) collected from the equatorial margin off the continental shelf of NE Brazil. This approach aims to improve the understanding of the dynamics of paleoclimatic and sedimentary inputs on the coast of northeastern Brazil. Marine sediments were analyzed via Mass Spectrometry (ICP-MS) after total digestion with HF/HNO 3 . REEs proxies are a useful tool in understanding the transport and origin of sediments due to their physicochemical properties. Our data showed the Parnaíba River was the main source of REEs content in the western South Atlantic. Fe minerals (Fe-oxyhydroxides) produced via weathering of continental and tropical soils were the principal REE-carrier phase during transportation and ultimate deposition at core site GL-1248. Several regional climatic factors mainly rainfall changes contributed significantly to continental-REEs erosion of sedimentary layers of the Parnaíba Basin, and transport and deposition of the mobilized REEs from the continent to the study site. Furthermore, changes in the negative Ce-anomaly showed low variation along the core indicating a reduction in deep ocean oxygenation during the interglacial relative to the last glacial period. That variation, probably, was associated with glacial-interglacial variations in sea level with the exposure of the continental shelf. The origin of positive Eu anomalies in siliciclastic sediment, also observed in the core, was explained by preferential retention by feldspars such as plagioclases and potassium feldspars mostly from the assimilation of felspar during fractionation crystallization of felsic magma in the Parnaíba basin since the Last Interglacial.

Continental Margin

10.3389/fmars.2022.846976

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Citations (7)