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- W1852580077 abstract "Carbon isotope chemostratigraphy is a powerful tool in the study of non-fossiliferous metasedimentary carbonate rocks. This study deals with d 13 C fluctuation within the Precambrian Jucurutu and Serido 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 δ 13 C with values varying from +8.5 to +10%o PDB . The Serido Formation, by its turn, shows a more pronounced variation with, values varying from +6.5 to +10.5 %o PDB . According to our carbon isotope data versus the available δ 13 C 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" @default.
- W1852580077 created "2016-06-24" @default.
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- W1852580077 date "2000-01-01" @default.
- W1852580077 modified "2023-09-24" @default.
- W1852580077 title "Carbon isotope fluctuations in Precambrian marbles of the Serido Belt, Borborema Province, Northeast Brazil" @default.
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- W1852580077 doi "https://doi.org/10.5327/rbg.v30i3.848" @default.
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