Rhyacian and Neoproterozoic magmatic associations of the Gurupi Belt,Brazil: Implications for the tectonic evolution, and regional correlations

作     者：Evandro L.Klein Elem C.S.Lopes Joseneusa B.Rodrigues Sulsiene M.Souza-Gaia Umberto G.Cordani Evandro L. Klein;Elem C.S. Lopes;Joseneusa B. Rodrigues;Sulsiene M. Souza-Gaia;Umberto G. Cordani

作者机构：Geological Survey of Brazil-SBNQuadra 02Bloco HEd.Central Brasília1°AndarAsa NorteBrasíliaDFCEP:70040-904Brazil GPGE-Grupo de Pesquisa Em Geologia EconômicaPPGG-Programa de Pòs-Graduação Em Geologia e GeoquímicaUniversidade Federal Do ParáBelémPABrazil Geological Survey of BrazilAv.Dr.Freitas3645BelémPACEP:66095-110Brazil Universidade de São PauloInstituto de GeociênciasRua Do Lago562Cidade UniversitariaSão Paulo-SPCEP:05508-080Brazil 

出 版 物：《Geoscience Frontiers》 (地学前缘（英文版）)

年 卷 期：2020年第11卷第6期

页      面：2243-2269页

核心收录：

学科分类：070904[理学-构造地质学] 0709[理学-地质学] 07[理学] 

基　　金：outcome of institutional projects developed by CPRM/Geological Survey of Brazil in the Gurupi Belt with the additional support of the Brazilian“Conselho Nacional de Desenvolvimento Científico e Tecnologico”(CNPq)to the first author(research grant 306798/2016-6) 

主　　题：Neoproterozoic Paleoproterozoic Accretionary orogeny Intracontinental orogeny West Gondwana Isotope geology 

摘      要：The Gurupi Belt,in north-northeastern Brazil,is a mobile belt developed in the south-southwestern margin of the Sao Luis cratonic fragment and crops out as a tectonic and erosional window within the Phanerozoic ***,petrographic,geochemical,geochronological,and Nd isotopic information(new and published)constrain the timing and types of magmatic associations present in the belt and the tectonic settings in which they *** Rhyacian was the main period of magmatic activity,which can be grouped into two main stages.(1)~2185-2130 Ma:pre-collisional,juvenile,calc-alkaline magnesian and calcic ferroan granitoid suites,and minor calc-alkaline and tholeiitic mafic plutonism(now amphibolites),formed in intra-oceanic to transitional/continental arcs;and intra-or back-arc volcano-sedimentary basin.(2)~2125-2070 Ma:syn-(two-mica granites)to late-collisional(potassic to shoshonitic granites and quartz-syenite)plutonic suites produced after crustal thickening and melting,with localized migmatization,that intruded during the compressive D1 deformational phase and concomitantly with greenschist to amphibolite *** is a zonation of the Rhyacian episodes,with intra-oceanic stages occurring to the northeast,and the continental arc and collisional phases occurring to the southwest,indicating the presence of an active continental margin to the southwest,and subduction from NE to SW(present-day configuration).This magmatic framework is a continuation to the south of what is described for the Sao Luis cratonic fragment to the north,and the orogenic scenario is identical to what is observed for the same period in the West African Craton(Eburnean/Birrimian orogen),which additionally supports previous geological *** the Neoproterozoic,a few magmatic occurrences are *** extensional event allowed the intrusion of an anorogenic,nepheline syenite at ca.730 Ma,which was followed by the intrusion of a crustal,calc-alkaline microtonalite,of uncertain