C- and Sr-isotope stratigraphy of the São Caetano complex, Northeastern Brazil: a contribution to the study of the Meso-Neoproterozoic seawater geochemistry
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| Format: | Artículo científico |
| Language: | en |
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Academia Brasileira de Ciências
2005
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| _version_ | 1876491019951800320 |
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| author | Juan C. Silva |
| author_facet | Juan C. Silva |
| contents | C- and Sr-isotope stratigraphy of the São Caetano complex, Northeastern Brazil: a contribution to the study of the Meso-Neoproterozoic seawater geochemistry Juan C. Silva Alcides N. Sial Valderez P. Ferreira Márcio M. Pimentel Multidisciplinaria (Ciencias Naturales y Exactas) isotopes chemostratigraphy BorboremaProvince NortheasternBrazil Meso Neoproterozoic C-isotopeand87Sr/86SrvaluesforfivecarbonatesuccessionsfromtheSãoCaetanoComplex,northeasternBrazil,wereusedtoconstraintheirdepositionalageandtodeterminelargevariationsintheC-andSr-isotopiccompositionofseawaterundertheframeworkofglobaltectonicevents.ThreeC-isotopestageswereidentifiedfrombasetotopinacomposedchemostratigraphicsection:(1)stageinwhichδ13Cvaluesvaryfrom+2to+3.7◦/◦◦PDBandaverage3◦/◦◦PDB,(2)stagewithδ13Cvaluesdisplayingstrongeroscillations(from−2◦/◦◦to+3◦/◦◦PDB),and(3)stagewithanisotopicplateauwithvaluesaround+3.7◦/◦◦PDB.Constant87Sr/86Srvalues(∼0.70600)characterizeC-isotopestage1,whereasslightlyfluctuatingvalues(from0.70600to0.70700)characterizeC-isotopestage2.Finally,87Sr/86Srvaluesaveraging0.70600characterizeC-isotopestage3.TheC-andSr-chemostratigraphicpathwayspermittostate:(a)theC-andSr-isotopesecularcurvesregisteredprimaryfluctuationsoftheisotopecompositionofseawaterduringlateMesoproterozoic-earlyNeoprotero-zoictransitionintheBorboremaProvince,and(b)onsetoftheCaririsVelhos/Greenvillecycle,widespreadoceanicrifting,continentalmagmaticarcformationandonsetoftheagglutinationofRodiniasupercontinent,mostlycontrolledtheC-andSr-isotopecompositionofseawaterduringtheC-isotopestages1,2and3. 2005 artículo científico 0001-3765 https://www.redalyc.org/articulo.oa?id=32777111 en http://www.redalyc.org/revista.oa?id=327 Anais da Academia Brasileira de Ciências application/pdf Academia Brasileira de Ciências Anais da Academia Brasileira de Ciências (Brasil) Num.1 Vol.77 |
| format | Artículo científico |
| id | redalyc_32777111 |
| institution | Redalyc |
| language | en |
| publishDate | 2005 |
| publisher | Academia Brasileira de Ciências |
| spellingShingle | C- and Sr-isotope stratigraphy of the São Caetano complex, Northeastern Brazil: a contribution to the study of the Meso-Neoproterozoic seawater geochemistry Juan C. Silva Multidisciplinaria (Ciencias Naturales y Exactas) isotopes chemostratigraphy BorboremaProvince NortheasternBrazil Meso Neoproterozoic C- and Sr-isotope stratigraphy of the São Caetano complex, Northeastern Brazil: a contribution to the study of the Meso-Neoproterozoic seawater geochemistry Juan C. Silva Alcides N. Sial Valderez P. Ferreira Márcio M. Pimentel Multidisciplinaria (Ciencias Naturales y Exactas) isotopes chemostratigraphy BorboremaProvince NortheasternBrazil Meso Neoproterozoic C-isotopeand87Sr/86SrvaluesforfivecarbonatesuccessionsfromtheSãoCaetanoComplex,northeasternBrazil,wereusedtoconstraintheirdepositionalageandtodeterminelargevariationsintheC-andSr-isotopiccompositionofseawaterundertheframeworkofglobaltectonicevents.ThreeC-isotopestageswereidentifiedfrombasetotopinacomposedchemostratigraphicsection:(1)stageinwhichδ13Cvaluesvaryfrom+2to+3.7◦/◦◦PDBandaverage3◦/◦◦PDB,(2)stagewithδ13Cvaluesdisplayingstrongeroscillations(from−2◦/◦◦to+3◦/◦◦PDB),and(3)stagewithanisotopicplateauwithvaluesaround+3.7◦/◦◦PDB.Constant87Sr/86Srvalues(∼0.70600)characterizeC-isotopestage1,whereasslightlyfluctuatingvalues(from0.70600to0.70700)characterizeC-isotopestage2.Finally,87Sr/86Srvaluesaveraging0.70600characterizeC-isotopestage3.TheC-andSr-chemostratigraphicpathwayspermittostate:(a)theC-andSr-isotopesecularcurvesregisteredprimaryfluctuationsoftheisotopecompositionofseawaterduringlateMesoproterozoic-earlyNeoprotero-zoictransitionintheBorboremaProvince,and(b)onsetoftheCaririsVelhos/Greenvillecycle,widespreadoceanicrifting,continentalmagmaticarcformationandonsetoftheagglutinationofRodiniasupercontinent,mostlycontrolledtheC-andSr-isotopecompositionofseawaterduringtheC-isotopestages1,2and3. 2005 artículo científico 0001-3765 https://www.redalyc.org/articulo.oa?id=32777111 en http://www.redalyc.org/revista.oa?id=327 Anais da Academia Brasileira de Ciências application/pdf Academia Brasileira de Ciências Anais da Academia Brasileira de Ciências (Brasil) Num.1 Vol.77 |
| title | C- and Sr-isotope stratigraphy of the São Caetano complex, Northeastern Brazil: a contribution to the study of the Meso-Neoproterozoic seawater geochemistry |
| topic | Multidisciplinaria (Ciencias Naturales y Exactas) isotopes chemostratigraphy BorboremaProvince NortheasternBrazil Meso Neoproterozoic |
| url | https://www.redalyc.org/articulo.oa?id=32777111 |