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Transport-controlled hydrothermal replacement of calcite by Mg-carbonates

2015; Geological Society of America; Volume: 43; Issue: 9 Linguagem: Inglês

10.1130/g36934.1

1943-2682

Laura Jonas, Thomas Müller, Ralf Dohmen, Lukas P. Baumgartner, Benita Putlitz,

Calcium Carbonate Crystallization and Inhibition

Research Article| September 01, 2015 Transport-controlled hydrothermal replacement of calcite by Mg-carbonates Laura Jonas; Laura Jonas * 1Institut für Geologie, Mineralogie und Geophysik, Ruhr-Universität Bochum, Universitätsstrasse 150, D-44801 Bochum, Germany *E-mails: laura.jonas@rub.de; t.mueller@leeds.ac.uk; ralf.dohmen@rub.de; lukas.baumgartner@unil.ch; benita.putlitz@unil.ch. Search for other works by this author on: GSW Google Scholar Thomas Müller; Thomas Müller * 1Institut für Geologie, Mineralogie und Geophysik, Ruhr-Universität Bochum, Universitätsstrasse 150, D-44801 Bochum, Germany2School of Earth and Environmental Sciences, University of Leeds, LS2 9JT Leeds, UK *E-mails: laura.jonas@rub.de; t.mueller@leeds.ac.uk; ralf.dohmen@rub.de; lukas.baumgartner@unil.ch; benita.putlitz@unil.ch. Search for other works by this author on: GSW Google Scholar Ralf Dohmen; Ralf Dohmen * 1Institut für Geologie, Mineralogie und Geophysik, Ruhr-Universität Bochum, Universitätsstrasse 150, D-44801 Bochum, Germany *E-mails: laura.jonas@rub.de; t.mueller@leeds.ac.uk; ralf.dohmen@rub.de; lukas.baumgartner@unil.ch; benita.putlitz@unil.ch. Search for other works by this author on: GSW Google Scholar Lukas Baumgartner; Lukas Baumgartner * 3Institute of Earth Sciences, University of Lausanne, Geopolis Building, CH-1015 Lausanne, Switzerland *E-mails: laura.jonas@rub.de; t.mueller@leeds.ac.uk; ralf.dohmen@rub.de; lukas.baumgartner@unil.ch; benita.putlitz@unil.ch. Search for other works by this author on: GSW Google Scholar Benita Putlitz Benita Putlitz * 3Institute of Earth Sciences, University of Lausanne, Geopolis Building, CH-1015 Lausanne, Switzerland *E-mails: laura.jonas@rub.de; t.mueller@leeds.ac.uk; ralf.dohmen@rub.de; lukas.baumgartner@unil.ch; benita.putlitz@unil.ch. Search for other works by this author on: GSW Google Scholar Author and Article Information Laura Jonas * 1Institut für Geologie, Mineralogie und Geophysik, Ruhr-Universität Bochum, Universitätsstrasse 150, D-44801 Bochum, Germany Thomas Müller * 1Institut für Geologie, Mineralogie und Geophysik, Ruhr-Universität Bochum, Universitätsstrasse 150, D-44801 Bochum, Germany2School of Earth and Environmental Sciences, University of Leeds, LS2 9JT Leeds, UK Ralf Dohmen * 1Institut für Geologie, Mineralogie und Geophysik, Ruhr-Universität Bochum, Universitätsstrasse 150, D-44801 Bochum, Germany Lukas Baumgartner * 3Institute of Earth Sciences, University of Lausanne, Geopolis Building, CH-1015 Lausanne, Switzerland Benita Putlitz * 3Institute of Earth Sciences, University of Lausanne, Geopolis Building, CH-1015 Lausanne, Switzerland *E-mails: laura.jonas@rub.de; t.mueller@leeds.ac.uk; ralf.dohmen@rub.de; lukas.baumgartner@unil.ch; benita.putlitz@unil.ch. Publisher: Geological Society of America Received: 01 May 2015 Revision Received: 17 Jun 2015 Accepted: 18 Jun 2015 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2015 Geological Society of America Geology (2015) 43 (9): 779–782. https://doi.org/10.1130/G36934.1 Article history Received: 01 May 2015 Revision Received: 17 Jun 2015 Accepted: 18 Jun 2015 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Laura Jonas, Thomas Müller, Ralf Dohmen, Lukas Baumgartner, Benita Putlitz; Transport-controlled hydrothermal replacement of calcite by Mg-carbonates. Geology 2015;; 43 (9): 779–782. doi: https://doi.org/10.1130/G36934.1 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 Dolomitization is one of the most important diagenetic processes, but the reaction rate and time scale of dolomitization remain a topic of controversy. We conducted experiments in which the reaction of single calcite crystals with a Mg-rich fluid at 200 °C leads to the formation of a zoned reaction rim consisting of magnesite and, for intermediate times, Ca-rich dolomite. From detailed documentation of the evolution of the microtexture and chemical composition of the reaction rim, we infer a kinetic model for calcite replacement by Mg-carbonates. The chemical gradient for the structure-forming elements Mg and Ca in the reaction rim and the evolution of the rim thickness strongly indicate that the overall reaction rate is controlled by diffusive transport through the porous reaction rim. The composition of the product phases is kinetically controlled and records the local composition of the interfacial fluid without requiring oversaturation of the reservoir fluid. Reactive transport models on dolomitization processes assume that the rate of dolomitization depends on the rate of dolomite precipitation, which is contradictory to our experimental evidence. Modeling carbonate replacement in natural systems requires detailed knowledge on the evolution of the microstructure controlling the physicochemical transport properties of elements in the pore fluid. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.