%0 Journal Article %T Paleoproterozoic crustal evolution and Mesoproterozoic overprint in the Roosevelt-Guariba Transpressive Belt, Juruena Terrain, Southeastern Amazonas, Brazil %+ Geological Survey of Brazil (CPRM) %+ Federal University of Amazonas %+ The University of Western Australia (UWA) %+ Géosciences Rennes (GR) %A Almeida, Marcelo, E %A Oliveira, Antonio, Charles %A Orestes Santos, Joao %A Rodrigues, Joseneusa, B %A Ruffet, Gilles %Z GSB-CPRM (Sumaúma-Mutum-Roosevelt Project) %< avec comité de lecture %@ 2595-1939 %J Journal of the Geological Survey of Brazil %V 5 %N 3 %P 221 - 249 %8 2022-12 %D 2022 %R 10.29396/jgsb.2022.v5.n3.5 %K Rondônia-Juruena Southeastern Amazonas Tectonothermal Events Geochronology %K Rondônia-Juruena %K Southeastern Amazonas %K Tectonothermal Events %K Geochronology %Z Sciences of the Universe [physics]/Earth Sciences/Geochemistry %Z Sciences of the Universe [physics]/Earth Sciences/TectonicsJournal articles %X The Juruena Terrain (Rondônia-Juruena Province) in the southeastern Amazonas State shows a NW-SE dextral shear zones system denominated Roosevelt-Guariba Transpressive Belt (RGTB). The RGTB was generated in response to intracontinental crustal reworking, juxtaposing Paleoproterozoic Juruena granitic-gneiss and coeval supracrustal associations. This granitic-gneiss basement shows high-K calcalkaline (Teodósia Suite) to transitional I-to A-type (Igarapé das Lontras Suite) signatures, produced in a continental magmatic arc setting around 1760-1740 Ma (zircon, titanite; U-Pb SHRIMP, LA-ICP-MS). New geochronological data about of the deformation and metamorphic rocks in the RGTB were obtained from migmatite paragneisses, amphibolites, S-type leucogranite (Quatro Cachoeiras Complex and Itamaraty Suite; zircon U-Pb SHRIMP) and protomylonites and mylonites (Igarapé das Lontras and Teodosia protoliths; amphibole-muscovite-sericite Ar-Ar step heating). The results suggest that Southeastern Amazonas (northern Juruena Terrain) was metamorphosed/deformed during 1530-1460 Ma under temperatures of 900 o C (zircon) to 580 o C (hornblende) and 420 o C (muscovite). The geochronological data show that the granite-gneiss basement (continental magmatic arc) and supracrustal rocks (foreland basin) were reworked by a regional event with an age interval of 1530 Ma (high grade and anatexis) to 1460 Ma (medium grade). Finally, the Juruena Terrain is affected by a younger low-T event (1300 Ma, muscovite Ar-Ar step heating) with wide NE-trending structures (e.g. Buiuçu Shear Zone). This 1.3 Ga event suggests a continental reactivation caused by the pericratonic deformation related to Candeias/ Sunsás Orogeny during the Columbia Supercontinent break-up, before the Rodinia Supercontinent assembly. In summary, the Juruena Terrain in the southeast Amazonas shows a complex metamorphic and structural intracontinental evolution, involving polycyclic events from late Orosirian to Ectasian in a convergent tectonic setting. Therefore, the Juruena Terrain shows similar accretionary histories with other orogens and has apparent long-lived connections with Laurentia (Yavapai Province) and Baltica (Transscandinavian Igneous Belt), forming the core of the Columbia Supercontinent. %G English %2 https://hal-insu.archives-ouvertes.fr/insu-03968167/document %2 https://hal-insu.archives-ouvertes.fr/insu-03968167/file/jgsb_22_v5_n3_p_221_249_marcelo_almeida.pdf %L insu-03968167 %U https://hal-insu.archives-ouvertes.fr/insu-03968167 %~ INSU %~ UNIV-RENNES1 %~ UR2-HB %~ CNRS %~ GR %~ OSUR %~ UR1-HAL %~ UR1-SDLM %~ UNIV-RENNES2 %~ TEST-UR-CSS %~ UNIV-RENNES %~ INRAE %~ UR1-ENV %~ GR-CHRONOS