CARBON ISOTOPE FLUCTUATIONS IN PRECAMBRIAN MARBLES OF THE SERIDÓ BELT, BORBOREMA PROVINCE, NORTHEAST BRAZIL

CARBON ISOTOPE FLUCTUATIONS IN PRECAMBRIAN MARBLES OF THE SERIDÓ BELT, BORBOREMA PROVINCE, NORTHEAST BRAZIL

dc.contributoren-US
dc.contributorpt-BR
dc.creatorNASCIMENTO, RIELVA SOLIMAIRY CAMPELO DO
dc.creatorSIAL, ALCIDES NOBREGA
dc.date2017-03-29
dc.date.accessioned2022-12-15T20:20:19Z
dc.date.available2022-12-15T20:20:19Z
dc.identifierhttps://ppegeo.igc.usp.br/index.php/rbg/article/view/10675
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/5360701
dc.descriptionCarbon isotope chemostratigraphy is a powerful tool in the study of non-fossiliferous metasedimentary carbonate rocks. This study deals with d13C fluctuation within the Precambrian Jucurutu and Seridó Formations, Borborema province, in northeastern Brazil whose age has been a matter of debate for over three decades. While some researchers have assumed a Paleoproterozoic age for both Formations, radiometric ages have raised the possibility that they are Neoproterozoic. In an attempt to contribute to this debate, a detailed carbon isotope chemostratigraphy of these two Formations have been undertaken. The Jucururu Formation displays a remarkable homogeneous composition of δ13C with values varying from +8.5 to +10%oPDB. The Seridó Formation, by its turn, shows a more pronounced variation with, values varying from +6.5 to +10.5 %oPDB. According to our carbon isotope data versus the available δ13C secular variation curves, these two Formations could be either Paleoproterozoic (2.0-2.15Ga) or Neoproterozoic (0.6 to 0.65 Ga). Further Sr and Nd isotope studies of these carbonate sequences, coupled with more detailed field geology, are necessary to test the Neoproterozoic-age hypothesisen-US
dc.descriptionCarbon isotope chemostratigraphy is a powerful tool in the study of non-fossiliferous metasedimentary carbonate rocks. This study deals with d13C fluctuation within the Precambrian Jucurutu and Seridó Formations, Borborema province, in northeastern Brazil whose age has been a matter of debate for over three decades. While some researchers have assumed a Paleoproterozoic age for both Formations, radiometric ages have raised the possibility that they are Neoproterozoic. In an attempt to contribute to this debate, a detailed carbon isotope chemostratigraphy of these two Formations have been undertaken. The Jucururu Formation displays a remarkable homogeneous composition of δ13C with values varying from +8.5 to +10%oPDB. The Seridó Formation, by its turn, shows a more pronounced variation with, values varying from +6.5 to +10.5 %oPDB. According to our carbon isotope data versus the available δ13C secular variation curves, these two Formations could be either Paleoproterozoic (2.0-2.15Ga) or Neoproterozoic (0.6 to 0.65 Ga). Further Sr and Nd isotope studies of these carbonate sequences, coupled with more detailed field geology, are necessary to test the Neoproterozoic-age hypothesis.pt-BR
dc.formatapplication/pdf
dc.languageeng
dc.publisherSociedade Brasileira de Geologiapt-BR
dc.relationhttps://ppegeo.igc.usp.br/index.php/rbg/article/view/10675/10176
dc.rightsDireitos autorais 2017 Revista Brasileira de Geociênciaspt-BR
dc.sourceRevista Brasileira de Geociências; v. 30, n. 3 (2000); 446-449en-US
dc.sourceRevista Brasileira de Geociências; v. 30, n. 3 (2000); 446-449es-ES
dc.sourceRevista Brasileira de Geociências; v. 30, n. 3 (2000); 446-449pt-BR
dc.source0375-7536
dc.subjectCarbon isotopes; Marble; Borborema Province; Seridó; NE Brazil.en-US
dc.subjectCarbon isotopes; Marble; Borborema Province; Seridó; NE Brazil.pt-BR
dc.titleCARBON ISOTOPE FLUCTUATIONS IN PRECAMBRIAN MARBLES OF THE SERIDÓ BELT, BORBOREMA PROVINCE, NORTHEAST BRAZILen-US
dc.titleCARBON ISOTOPE FLUCTUATIONS IN PRECAMBRIAN MARBLES OF THE SERIDÓ BELT, BORBOREMA PROVINCE, NORTHEAST BRAZILpt-BR
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:eu-repo/semantics/publishedVersion
dc.typept-BR


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