The Campos Gerais Domain(CGD)in southeastern Brazil is an approximately 180 km×35 km area of Archean-Proterozoic rocks located southwest of the S?o Francisco Craton(SFC).The Archean-Paleopro terozoic evolution of the CGD-alongside its potential correlation with the SFC or other cratonic blocks in the region-is currently poorly-constrained.We present the results of systematic petrography,bulk-rock geochemistry,mineral chemistry and geochronology for a suite of scarcely studied mafic-ultramafic rocks from the CGD.We also provide a compilation of previously reported bulk-rock geochemical and spi-nel group mineral chemical data for mafic-ultramafic rocks throughout the CGD,and geochronological information for various lithotypes in the region.The CGD records a protracted Mesoarchean to Statherian(3.1-1.7 Ga)crustal evolution,which we interpret to share a common history with the south-ern SFC and their related reworked segments,suggesting that it is a westward extension of this cratonic terrain.The metavolcano-sedimentary rocks of the Fortaleza de Minas and Alpinópolis segments repre-sent a Mesoarchean greenstone belt that is stratigraphically and chemically comparable to Archean greenstone belts worldwide,and that is broadly coeval with a local suite of tonalite-trondhjemite-grano diorite(TTG)gneisses and migmatites.U-Pb SHRIMP zircon data from a subalkaline metagabbro yielded a concordia age of ca.2.96 Ga,revealing a previously unrecognized phase of Archean magmatism in the CGD that can be chrono-correlated with metakomatiite and TTG generation elsewhere in the S?o Francisco paleocontinent.Our data contradict a hypothesis whereby the metavolcano-sedimentary rocks of the Jacuí-Bom Jesus da Penha and Petunia segments represent an ophiolite,as previously suggested,instead presenting features that point to formation in association with a continental arc.Coupled with a U-Pb(SHRIMP)crystallization age of ca.2.13 Ga recorded by zircon grains from a metaultramafic rock,these data highlight that a magmatic event was chrono-correlated with the main accretionary phase of the Minas Orogeny,and with the Pouso Alegre/Amparo and S?o Vicente complexes.Finally,a U-Pb(SHRIMP)concordia age of ca.590 Ma-obtained from metamorphic-textured zircon grains from a metaultramafic rock-points to a late metamorphic overprint related to upper amphibolite conditions,brittle fault activation and the juxtaposition of crustal blocks in association with the latest stages of west-ern Gondwana's assembly in the southern SFC,with later retrogression to greenschist-facies.

Marco Aurélio Piacentini Pinheiro;George L.Guice;Joana Reis Magalh?es

Geological Survey of Brazil-CPRM,Av Brazil 1731,Belo Horizonte 30140-002,Brazil;Department of Mineral Sciences,National Museum of Natural History,Smithsonian Institution,10th Street and Constitution Avenue NW,Washington D.C.20560,USA

地学前缘（英文版）

[1]Marco Aurélio Piacentini Pinheiro;George L.Guice;Joana Reis Magalh?es-.Archean-Ediacaran evolution of the Campos Gerais Domain-A reworked margin of the S?o Francisco paleocontinent(SE Brazil):Constraints from metamafic-ultramafic rocks)[J].地学前缘（英文版）,2022(05):286-308

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