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Metamorphism disturbs the Re-Os signatures of platinum-group minerals in ophiolite chromitites

2012; Geological Society of America; Volume: 40; Issue: 7 Linguagem: Inglês

10.1130/g33064.1

1943-2682

José María González-Jiménez, William L. Griffin, Fernando Gervilla, Thomas Kerestedjian, Suzanne Y. O’Reilly, Joaquín A. Proenza, Norman J. Pearson, Ivanina Sergeeva,

earthquake and tectonic studies

Research Article| July 01, 2012 Metamorphism disturbs the Re-Os signatures of platinum-group minerals in ophiolite chromitites José M. González-Jiménez; José M. González-Jiménez 1ARC Centre of Excellence for Core to Crust Fluid Systems (CCFS) and GEMOC National Key Centre, Department of Earth and Planetary Sciences, Macquarie University, Sydney, NSW 2109, Australia Search for other works by this author on: GSW Google Scholar William L. Griffin; William L. Griffin 1ARC Centre of Excellence for Core to Crust Fluid Systems (CCFS) and GEMOC National Key Centre, Department of Earth and Planetary Sciences, Macquarie University, Sydney, NSW 2109, Australia Search for other works by this author on: GSW Google Scholar Fernando Gervilla; Fernando Gervilla 2Departamento de Mineralogía y Petrología and IACT (Universidad de Granada-CSIC), Facultad de Ciencias, Avenida Fuentenueva s/n, 18002 Granada, Spain Search for other works by this author on: GSW Google Scholar Thomas N. Kerestedjian; Thomas N. Kerestedjian 3Geological Institute, Bulgarian Academy of Sciences, 24 Georgi Bonchev Street, 1113 Sofia, Bulgaria Search for other works by this author on: GSW Google Scholar Suzanne Y. O'Reilly; Suzanne Y. O'Reilly 1ARC Centre of Excellence for Core to Crust Fluid Systems (CCFS) and GEMOC National Key Centre, Department of Earth and Planetary Sciences, Macquarie University, Sydney, NSW 2109, Australia Search for other works by this author on: GSW Google Scholar Joaquín A. Proenza; Joaquín A. Proenza 4Departament de Cristallografia, Mineralogia i Dipòsits Minerals, Universitat de Barcelona, Martí i Franquès s/n, 08028 Barcelona, Spain Search for other works by this author on: GSW Google Scholar Norman J. Pearson; Norman J. Pearson 1ARC Centre of Excellence for Core to Crust Fluid Systems (CCFS) and GEMOC National Key Centre, Department of Earth and Planetary Sciences, Macquarie University, Sydney, NSW 2109, Australia Search for other works by this author on: GSW Google Scholar Ivanina Sergeeva Ivanina Sergeeva 3Geological Institute, Bulgarian Academy of Sciences, 24 Georgi Bonchev Street, 1113 Sofia, Bulgaria Search for other works by this author on: GSW Google Scholar Author and Article Information José M. González-Jiménez 1ARC Centre of Excellence for Core to Crust Fluid Systems (CCFS) and GEMOC National Key Centre, Department of Earth and Planetary Sciences, Macquarie University, Sydney, NSW 2109, Australia William L. Griffin 1ARC Centre of Excellence for Core to Crust Fluid Systems (CCFS) and GEMOC National Key Centre, Department of Earth and Planetary Sciences, Macquarie University, Sydney, NSW 2109, Australia Fernando Gervilla 2Departamento de Mineralogía y Petrología and IACT (Universidad de Granada-CSIC), Facultad de Ciencias, Avenida Fuentenueva s/n, 18002 Granada, Spain Thomas N. Kerestedjian 3Geological Institute, Bulgarian Academy of Sciences, 24 Georgi Bonchev Street, 1113 Sofia, Bulgaria Suzanne Y. O'Reilly 1ARC Centre of Excellence for Core to Crust Fluid Systems (CCFS) and GEMOC National Key Centre, Department of Earth and Planetary Sciences, Macquarie University, Sydney, NSW 2109, Australia Joaquín A. Proenza 4Departament de Cristallografia, Mineralogia i Dipòsits Minerals, Universitat de Barcelona, Martí i Franquès s/n, 08028 Barcelona, Spain Norman J. Pearson 1ARC Centre of Excellence for Core to Crust Fluid Systems (CCFS) and GEMOC National Key Centre, Department of Earth and Planetary Sciences, Macquarie University, Sydney, NSW 2109, Australia Ivanina Sergeeva 3Geological Institute, Bulgarian Academy of Sciences, 24 Georgi Bonchev Street, 1113 Sofia, Bulgaria Publisher: Geological Society of America Received: 27 Nov 2011 Revision Received: 06 Feb 2012 Accepted: 13 Feb 2012 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2012 Geological Society of America Geology (2012) 40 (7): 659–662. https://doi.org/10.1130/G33064.1 Article history Received: 27 Nov 2011 Revision Received: 06 Feb 2012 Accepted: 13 Feb 2012 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation José M. González-Jiménez, William L. Griffin, Fernando Gervilla, Thomas N. Kerestedjian, Suzanne Y. O'Reilly, Joaquín A. Proenza, Norman J. Pearson, Ivanina Sergeeva; Metamorphism disturbs the Re-Os signatures of platinum-group minerals in ophiolite chromitites. Geology 2012;; 40 (7): 659–662. doi: https://doi.org/10.1130/G33064.1 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 Os-isotope compositions of platinum-group minerals (PGMs) in ophiolite chromitites are commonly regarded as resistant to fluid-related processes, and have been used to track the evolution of Earth's convecting mantle. However, we have found significant differences in 187Os/188Os between primary and secondary PGMs from metamorphosed ophiolite chromitites of the Dobromirtsi Ultramafic Massif, in the Central Rhodope Metamorphic Core Complex of southeastern Bulgaria. Primary (magmatic) PGMs hosted in unaltered chromite cores have 187Os/188Os from 0.1231 to 0.1270, and 187Re/188Os ≤ 0.002.TMA and TRD model ages, calculated relative to the Enstatite Chondrite Reservoir, cluster around three main peaks: ca. 0.3, 0.4, and 0.6 Ga. Secondary PGMs, produced by alteration of magmatic PGMs, have a wider range of variation (187Os/188Os = 0.1124–0.1398, 187Re/188Os ≤ 0.024); these grains yield TMA and TRD model ages from –1.7 Ga up to 2.2 Ga. The larger range in 187Os/188Os in the secondary PGMs is interpreted as due to reactions between the primary PGMs and infiltrating metamorphic-hydrothermal fluids with a range of Os-isotope compositions. This redistribution of Os in PGMs during metamorphism has significant implications for the interpretation of both whole-rock and in situ Os-isotope data in mantle-derived rocks. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.