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Early diagenesis of sulfur in a tropical upwelling system, Cabo Frio, southeastern Brazil

2012; Geological Society of America; Volume: 40; Issue: 10 Linguagem: Inglês

10.1130/g33111.1

1943-2682

Rut Díaz, Manuel Moreira, Úrsula Mendoza, Wilson Machado, Michael E. Böttcher, Helenice Santos, André Belem, Ramsés Capilla, Peter Escher, Ana Luíza Spadano Albuquerque,

Methane Hydrates and Related Phenomena

Research Article| October 01, 2012 Early diagenesis of sulfur in a tropical upwelling system, Cabo Frio, southeastern Brazil Rut Diaz; Rut Diaz 1Projeto Ressurgencia Team, Programa de Geoquímica Ambiental, Universidade Federal Fluminense, Outeiro São João Baptista s/n., Niterói RJ 24020-150, Brazil Search for other works by this author on: GSW Google Scholar Manuel Moreira; Manuel Moreira 1Projeto Ressurgencia Team, Programa de Geoquímica Ambiental, Universidade Federal Fluminense, Outeiro São João Baptista s/n., Niterói RJ 24020-150, Brazil Search for other works by this author on: GSW Google Scholar Ursula Mendoza; Ursula Mendoza 1Projeto Ressurgencia Team, Programa de Geoquímica Ambiental, Universidade Federal Fluminense, Outeiro São João Baptista s/n., Niterói RJ 24020-150, Brazil Search for other works by this author on: GSW Google Scholar Wilson Machado; Wilson Machado 1Projeto Ressurgencia Team, Programa de Geoquímica Ambiental, Universidade Federal Fluminense, Outeiro São João Baptista s/n., Niterói RJ 24020-150, Brazil Search for other works by this author on: GSW Google Scholar Michael E. Böttcher; Michael E. Böttcher 2Geochemistry & Isotope Geochemistry Group, Marine Geology Section, Leibniz Institute for Baltic Sea Research Warnemünde, D-18119 Warnemünde, Germany Search for other works by this author on: GSW Google Scholar Helenice Santos; Helenice Santos 1Projeto Ressurgencia Team, Programa de Geoquímica Ambiental, Universidade Federal Fluminense, Outeiro São João Baptista s/n., Niterói RJ 24020-150, Brazil Search for other works by this author on: GSW Google Scholar André Belém; André Belém 1Projeto Ressurgencia Team, Programa de Geoquímica Ambiental, Universidade Federal Fluminense, Outeiro São João Baptista s/n., Niterói RJ 24020-150, Brazil Search for other works by this author on: GSW Google Scholar Ramsés Capilla; Ramsés Capilla 3Petrobras–Cenpes, Cidade Universitária, Ilha do Fundão, RJ 21941-915, Brazil Search for other works by this author on: GSW Google Scholar Peter Escher; Peter Escher 2Geochemistry & Isotope Geochemistry Group, Marine Geology Section, Leibniz Institute for Baltic Sea Research Warnemünde, D-18119 Warnemünde, Germany Search for other works by this author on: GSW Google Scholar Ana L. Albuquerque Ana L. Albuquerque * 1Projeto Ressurgencia Team, Programa de Geoquímica Ambiental, Universidade Federal Fluminense, Outeiro São João Baptista s/n., Niterói RJ 24020-150, Brazil *E-mail: analuiza@geoq.uff.br. Search for other works by this author on: GSW Google Scholar Geology (2012) 40 (10): 879–882. https://doi.org/10.1130/G33111.1 Article history received: 10 Dec 2011 rev-recd: 07 May 2012 accepted: 27 May 2012 first online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Rut Diaz, Manuel Moreira, Ursula Mendoza, Wilson Machado, Michael E. Böttcher, Helenice Santos, André Belém, Ramsés Capilla, Peter Escher, Ana L. Albuquerque; Early diagenesis of sulfur in a tropical upwelling system, Cabo Frio, southeastern Brazil. Geology 2012;; 40 (10): 879–882. doi: https://doi.org/10.1130/G33111.1 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 SocietyGeology Search Advanced Search Abstract The early diagenesis of sulfur was assessed in four short sediment cores on the continental shelf off southeastern Brazil that were deposited under the influence of an upwelling tropical system. This tropical upwelling area allows a direct focus on the coupled roles of hydrodynamic- and bioturbation-driven influences on sulfate reduction, sulfide re-oxidation and corresponding stable sulfur isotope signal formation. Under the depositional conditions of Cabo Frio, the degree of reactive iron pyritization was limited by both dissolved sulfide availability and pyrite oxidation events. Textural analyses of pyrite framboids provide evidence of re-oxidation processes, reflecting dynamic redox conditions in the sediments. The isotope composition of pore-water sulfate remained close to the modern seawater value, but very light stable sulfur isotope ratios (34S/32S) of chromium reducible sulfur (essentially pyrite) are found that reflect intense bioturbation-induced sulfur re-cycling. The sulfur isotope signatures developing in these tropical upwelling sites are similar to those of modern euxinic systems, although they are caused by a superimposition of sulfate reduction and an intense oxidative sulfur cycle. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.