Isotopic and geochemical constraints for a Paleoproterozoic accretionary orogen in the Borborema Province, NE Brazil: Implications for reconstructing Nuna/Columbia

Lauro C&#233;zar M. de Lira Santos; Geysson A. Lages; Fabr&#237;cio A. Caxito; Elton L. Dantas; Peter A. Cawood; Haroldo M. Lima; Felipe J. da Cruz Lima

doi:10.1016/j.gsf.2021.101167

Volume 13 Issue 5

Sep. 2022

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Lauro Cézar M. de Lira Santos, Geysson A. Lages, Fabrício A. Caxito, Elton L. Dantas, Peter A. Cawood, Haroldo M. Lima, Felipe J. da Cruz Lima. Isotopic and geochemical constraints for a Paleoproterozoic accretionary orogen in the Borborema Province, NE Brazil: Implications for reconstructing Nuna/Columbia[J]. Geoscience Frontiers, 2022, 13(5): 101167. doi: 10.1016/j.gsf.2021.101167

Citation:

Lauro Cézar M. de Lira Santos, Geysson A. Lages, Fabrício A. Caxito, Elton L. Dantas, Peter A. Cawood, Haroldo M. Lima, Felipe J. da Cruz Lima. Isotopic and geochemical constraints for a Paleoproterozoic accretionary orogen in the Borborema Province, NE Brazil: Implications for reconstructing Nuna/Columbia[J]. Geoscience Frontiers, 2022, 13(5): 101167. doi: 10.1016/j.gsf.2021.101167

Citation:

Lauro Cézar M. de Lira Santos, Geysson A. Lages, Fabrício A. Caxito, Elton L. Dantas, Peter A. Cawood, Haroldo M. Lima, Felipe J. da Cruz Lima. Isotopic and geochemical constraints for a Paleoproterozoic accretionary orogen in the Borborema Province, NE Brazil: Implications for reconstructing Nuna/Columbia[J]. Geoscience Frontiers, 2022, 13(5): 101167. doi: 10.1016/j.gsf.2021.101167

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Isotopic and geochemical constraints for a Paleoproterozoic accretionary orogen in the Borborema Province, NE Brazil: Implications for reconstructing Nuna/Columbia

doi: 10.1016/j.gsf.2021.101167

a. Departamento de Geologia, Universidade Federal de Pernambuco, Av. da Arquitetura, Cidade Universitária, Recife, PE, Brazil;
b. Serviço Geológico do Brasil-CPRM, Av. Sul, Afogados, Recife, PE, Brazil;
c. CPMTC, Instituto de Geociências, Universidade Federal de Minas Gerais, Av. Pres. Antônio Carlos, Pampulha, Belo Horizonte, MG, Brazil;
d. Instituto de Geociências, Universidade de Brasília, Campus Universitário Darcy Ribeiro, Asa Norte, Brasília, DF, Brazil;
e. School of Earth, Atmosphere and Environment, Monash University, Wellington Rd, Clayton, VIC 3800, Australia;
f. Departamento de Geologia, Universidade Federal do Ceará, Campus do Pici, Parquelândia, Fortaleza, CE, Brazil

Funds:

This paper represents a later contribution of the first author PhD thesis. PAC acknowledges support from Australian Research Council grant FL160100168. This study was supported by the National Institute of Science and Technology for Tectonic Studies (INCT) of Brazil. Comments and criticism made by Dr. Henrique Bruno and an anonymous reviewer are appreciated as well as those from Kathryn Cutts and M. Santosh.

Received Date: 2020-08-26
Accepted Date: 2021-01-28
Rev Recd Date: 2021-01-25
Publish Date: 2021-02-08

Abstract

Abstract

The Alto Moxotó Terrane of the Borborema Province presents a wide exposure of Paleoproterozoic crust, but unlike other continental blocks of South America, its orogenic history is strongly obliterated by late Neoproterozoic deformation. New isotopic and geochemical studies were conducted in mafic-ultramafic (Fazenda Carmo Suite) and granitic-gneissic rocks (Riacho do Navio Suite) within the terrane. The former present zircon U-Pb crystallization ages at ca. 2.13 Ga, whereas Sm-Nd data suggests a juvenile origin via melting of early Paleoproterozoic to Archean peridotitic sources. Geochemical data for these rocks are compatible with tholeiitic magmas with some degree of crustal contamination and trace element distribution points to a continental-arc related setting interpreted as remnants of the early stages of subduction. In contrast, the Riacho do Navio Suite was emplaced at ca. 2.08 Ga and has highly negative ε_Nd(t) values indicating crustal reworking. The suite displays calc-alkali to alkali-calcic and ferroan geochemical signatures compatible with Cordilleran magmas. In addition, trace-element distribution as well as discriminant diagrams suggest that the precursor magmas were generated during the later stages of a continental arc or in a syn-collisional setting. Based on our results, we suggest that the studied units might represent missing pieces of a Paleoproterozoic accretionary orogen that formed the crustal framework of the Alto Moxotó Terrane, and that this represents a block associated with assembly of the Nuna/Columbia supercontinent, which is now largely hidden within the Neoproterozoic orogenic belts of West Gondwana.

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References(114)

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