U-Pb geochronology;
Detrital zircon;
Age distribution comparison;
Quadrilatero Ferrifero;
Transamazonian orogeny;
DETRITAL ZIRCON RECORD;
U-PB AGES;
RIO-DAS-VELHAS;
ITABIRA IRON-FORMATION;
GREAT OXIDATION EVENT;
QUADRILATERO-FERRIFERO;
SNOWBALL EARTH;
MINEIRO BELT;
CONTINENTAL-CRUST;
GREENSTONE-BELT;
D O I:
10.1016/j.jsames.2020.102628
中图分类号:
P [天文学、地球科学];
学科分类号:
07 ;
摘要:
Like many other cratons around the world, the Sao Francisco Craton is characterized by an early Paleoproterozoic (2.5-2.1 Ga) unconformity that is reported worldwide as the result of global glacial events leading to a major sea-level drop. To document the duration and the cause(s) of the stratigraphic hiatus in the Sao Francisco Craton, this study provides U-Pb dates obtained on detrital zircon grains from the Piracicaba Group, which directly overlies the unconformity. Our results show that this sedimentary unit is younger than 2333 +/- 11 Ma and consequently deposited during the late Siderian or the early Rhaycian. This maximum depositional age demonstrates that the early Paleoproterozoic stratigraphic gap lasted for at least 60 Ma. Based on quantitative analyses of the age distribution of the Piracicaba Group, we evidence a major shift in sedimentary provenance between the sedimentary units located below and above the unconformity. This change is interpreted to be directly related to the development of a subduction system along the southern and eastern margins of the Sao Francisco proto-craton. Our results indicate that regional geodynamic events, and not only global glacial events and their consequences, must be accounted for in Earth system models for the early Paleoproterozoic.
机构:
Univ Fed Ouro Preto, Dept Geol, Appl Isotope Res Grp, BR-35400000 Ouro Preto, MG, BrazilUniv Fed Ouro Preto, Dept Geol, Appl Isotope Res Grp, BR-35400000 Ouro Preto, MG, Brazil
Moreira, Hugo
Lana, Cristiano
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Univ Fed Ouro Preto, Dept Geol, Appl Isotope Res Grp, BR-35400000 Ouro Preto, MG, BrazilUniv Fed Ouro Preto, Dept Geol, Appl Isotope Res Grp, BR-35400000 Ouro Preto, MG, Brazil
Lana, Cristiano
Nalini, Herminio Arias, Jr.
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Univ Fed Ouro Preto, Dept Geol, Appl Isotope Res Grp, BR-35400000 Ouro Preto, MG, BrazilUniv Fed Ouro Preto, Dept Geol, Appl Isotope Res Grp, BR-35400000 Ouro Preto, MG, Brazil
机构:
Univ Fed Pampa Unipampa, Campus Cacapava do Sul,Av Pedro Anunciacao, BR-96570000 Cacapava Do Sul, RS, BrazilUniv Fed Pampa Unipampa, Campus Cacapava do Sul,Av Pedro Anunciacao, BR-96570000 Cacapava Do Sul, RS, Brazil
de Souza, Ezequiel Galvao
dos Santos Scherer, Claiton Marlon
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Univ Fed Rio Grande do Sul, Programa Posgrad Geol Inst Geociencias, Campus Vale,Av Bento Goncalves 9500, BR-91509900 Porto Alegre, RS, BrazilUniv Fed Pampa Unipampa, Campus Cacapava do Sul,Av Pedro Anunciacao, BR-96570000 Cacapava Do Sul, RS, Brazil
dos Santos Scherer, Claiton Marlon
Chemale Junior, Farid
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机构:
Univ Vale Rio Sinos UNISINOS, Programa Posgrad Geol, Av Unisinos 950, BR-93022000 Sao Leopoldo, RS, BrazilUniv Fed Pampa Unipampa, Campus Cacapava do Sul,Av Pedro Anunciacao, BR-96570000 Cacapava Do Sul, RS, Brazil
Chemale Junior, Farid
Ballico, Manoela Bettarel
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Univ Fed Santa Catarina, Dept Geociencias, Campus Univ, BR-88040900 Florianopolis, SC, BrazilUniv Fed Pampa Unipampa, Campus Cacapava do Sul,Av Pedro Anunciacao, BR-96570000 Cacapava Do Sul, RS, Brazil
Ballico, Manoela Bettarel
dos Reis, Adriano Domingos
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Univ Fed Rio Grande do Sul, Programa Posgrad Geol Inst Geociencias, Campus Vale,Av Bento Goncalves 9500, BR-91509900 Porto Alegre, RS, BrazilUniv Fed Pampa Unipampa, Campus Cacapava do Sul,Av Pedro Anunciacao, BR-96570000 Cacapava Do Sul, RS, Brazil
dos Reis, Adriano Domingos
May Rosseti, Lucas Magalhaes
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Univ Fed Rio Grande do Sul, Programa Posgrad Geol Inst Geociencias, Campus Vale,Av Bento Goncalves 9500, BR-91509900 Porto Alegre, RS, BrazilUniv Fed Pampa Unipampa, Campus Cacapava do Sul,Av Pedro Anunciacao, BR-96570000 Cacapava Do Sul, RS, Brazil
机构:
Univ Fed Ouro Preto, Escola Minas, Dept Geol, BR-35400000 Ouro Preto, BrazilUniv Fed Ouro Preto, Escola Minas, Dept Geol, BR-35400000 Ouro Preto, Brazil
Sales Campos, Jose Carlos
Carneiro, Mauricio Antonio
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Univ Fed Ouro Preto, Escola Minas, Dept Geol, BR-35400000 Ouro Preto, BrazilUniv Fed Ouro Preto, Escola Minas, Dept Geol, BR-35400000 Ouro Preto, Brazil
机构:
Univ Fed Ouro Preto, Min Sch, Post Grad Program Crustal Evolut & Nat Resources, Dept Geol, Ouro Preto, MG, BrazilUniv Fed Ouro Preto, Min Sch, Post Grad Program Crustal Evolut & Nat Resources, Dept Geol, Ouro Preto, MG, Brazil
Alexandre Goulart, Luis Emanoel
Carneiro, Mauricio Antonio
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Unidade Ensino Descentralizada Araxa, Ctr Fed Educ Tecnol Minas Gerais, Araxa, MG, BrazilUniv Fed Ouro Preto, Min Sch, Post Grad Program Crustal Evolut & Nat Resources, Dept Geol, Ouro Preto, MG, Brazil
Carneiro, Mauricio Antonio
Endo, Issamu
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Univ Fed Ouro Preto, Min Sch, Dept Geol, Ouro Preto, MG, BrazilUniv Fed Ouro Preto, Min Sch, Post Grad Program Crustal Evolut & Nat Resources, Dept Geol, Ouro Preto, MG, Brazil
Endo, Issamu
de Freitas Suita, Marcos Tadeu
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Univ Fed Ouro Preto, Min Sch, Dept Geol, Ouro Preto, MG, BrazilUniv Fed Ouro Preto, Min Sch, Post Grad Program Crustal Evolut & Nat Resources, Dept Geol, Ouro Preto, MG, Brazil