Produção Nacional
Revisado por pares
Unusual Isotopic Composition of Carbonates from the Irati Formation, Brazil
1974; Geological Society of America; Volume: 85; Issue: 1 Linguagem: Inglês
10.1130/0016-7606(1974)85 2.0.co;2
ISSN1943-2674
AutoresWagner Ferraresi De Giovani, Enéas Salati, Onildo João Marini, Irving Friedman,
Tópico(s)Geological formations and processes
ResumoResearch Article| January 01, 1974 Unusual Isotopic Composition of Carbonates from the Irati Formation, Brazil WAGNER FERRARESI DE GIOVANI; WAGNER FERRARESI DE GIOVANI 1Centro de Energia Nuclear na Agricultura, ESALQ–USP, Piracicaba, Brazil Search for other works by this author on: GSW Google Scholar ENEAS SALATI; ENEAS SALATI 1Centro de Energia Nuclear na Agricultura, ESALQ–USP, Piracicaba, Brazil Search for other works by this author on: GSW Google Scholar ONILDO J. MARINI; ONILDO J. MARINI 2Departmento de Geociências, Universidade de Brasilia, Brasilia, Brazil Search for other works by this author on: GSW Google Scholar IRVING FRIEDMAN IRVING FRIEDMAN 3U.S. Geological Survey, Denver, Colorado 80225 Search for other works by this author on: GSW Google Scholar Author and Article Information WAGNER FERRARESI DE GIOVANI 1Centro de Energia Nuclear na Agricultura, ESALQ–USP, Piracicaba, Brazil ENEAS SALATI 1Centro de Energia Nuclear na Agricultura, ESALQ–USP, Piracicaba, Brazil ONILDO J. MARINI 2Departmento de Geociências, Universidade de Brasilia, Brasilia, Brazil IRVING FRIEDMAN 3U.S. Geological Survey, Denver, Colorado 80225 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1974) 85 (1): 41–44. https://doi.org/10.1130/0016-7606(1974)85 2.0.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation WAGNER FERRARESI DE GIOVANI, ENEAS SALATI, ONILDO J. MARINI, IRVING FRIEDMAN; Unusual Isotopic Composition of Carbonates from the Irati Formation, Brazil. GSA Bulletin 1974;; 85 (1): 41–44. doi: https://doi.org/10.1130/0016-7606(1974)85 2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract Samples of dolomite and limestone from the Permian Irati Formation collected in the Paraná Basin, southern Brazil, have been analyzed for δC13 and δO18. The δC13 ranges from +18.3‰ to −17.4‰ PDB, while the δO18 ranges from −2.6‰ to −12.5‰ PDB. In some quarries where the exposures are especially good, a large variation in δC13 can be found. The lower, dense gray dolomite has light carbon (−17 to +2.6‰), whereas the overlying intermediate zone of interbedded organic-rich shale and black dolomite has dolomite containing heavy carbon (+4.8 to +14.9‰PDB).We believe that the dolomite represents diagenetically altered limestone, and that light CO2 produced by decomposing organic matter was involved in the diagenesis of the lower units, while heavy CO2 produced by the isotopic exchange between CO2 and methane was involved in the alteration of the upper, organic-rich layers.The original environment of deposition may be represented by the few limestone outcrops from the southern part of the basin, which have somewhat light (−2.6 to −7.6‰) carbon and light (−6.7 to −11.1‰) oxygen that may be the result of precipitation in a lake or inland sea. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
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