Thin crust and exposed mantle control sulfide differentiation in slow-spreading ridge magmas
2017; Geological Society of America; Volume: 45; Issue: 10 Linguagem: Inglês
10.1130/g39287.1
ISSN1943-2682
AutoresJakub Ciążela, H. J. Dick, Juergen Koepke, Bartosz Pieterek, Andrzej Muszyński, Roman Botcharnikov, Thomas Kühn,
Tópico(s)earthquake and tectonic studies
ResumoResearch Article| August 04, 2017 Thin crust and exposed mantle control sulfide differentiation in slow-spreading ridge magmas Jakub Ciazela; Jakub Ciazela * 1Institut für Mineralogie, Leibniz Universität Hannover, Callinstrasse 3, 30167 Hanover, Germany2Institute of Geology, Adam Mickiewicz University, ul. Bogumiła Krygowskiego 12, 61-680 Poznań, Poland *E-mail: j.ciazela@mineralogie.uni-hannover.de Search for other works by this author on: GSW Google Scholar Henry J.B. Dick; Henry J.B. Dick 3Department of Geology and Geophysics, Woods Hole Oceanographic Institution, MS #8, McLean Laboratory, Woods Hole, Massachusetts 02543-1539, USA Search for other works by this author on: GSW Google Scholar Juergen Koepke; Juergen Koepke 1Institut für Mineralogie, Leibniz Universität Hannover, Callinstrasse 3, 30167 Hanover, Germany Search for other works by this author on: GSW Google Scholar Bartosz Pieterek; Bartosz Pieterek 2Institute of Geology, Adam Mickiewicz University, ul. Bogumiła Krygowskiego 12, 61-680 Poznań, Poland Search for other works by this author on: GSW Google Scholar Andrzej Muszynski; Andrzej Muszynski 2Institute of Geology, Adam Mickiewicz University, ul. Bogumiła Krygowskiego 12, 61-680 Poznań, Poland Search for other works by this author on: GSW Google Scholar Roman Botcharnikov; Roman Botcharnikov 1Institut für Mineralogie, Leibniz Universität Hannover, Callinstrasse 3, 30167 Hanover, Germany4Institut für Geowissenschaften, Johannes Guttenberg–Universität Mainz, J.-J. Becher Weg 21, 55128 Mainz, Germany Search for other works by this author on: GSW Google Scholar Thomas Kuhn Thomas Kuhn 5Bundesanstalt für Geowissenschaften und Rohstoffe, Stilleweg 2, 30655 Hanover, Germany Search for other works by this author on: GSW Google Scholar Author and Article Information Jakub Ciazela * 1Institut für Mineralogie, Leibniz Universität Hannover, Callinstrasse 3, 30167 Hanover, Germany2Institute of Geology, Adam Mickiewicz University, ul. Bogumiła Krygowskiego 12, 61-680 Poznań, Poland Henry J.B. Dick 3Department of Geology and Geophysics, Woods Hole Oceanographic Institution, MS #8, McLean Laboratory, Woods Hole, Massachusetts 02543-1539, USA Juergen Koepke 1Institut für Mineralogie, Leibniz Universität Hannover, Callinstrasse 3, 30167 Hanover, Germany Bartosz Pieterek 2Institute of Geology, Adam Mickiewicz University, ul. Bogumiła Krygowskiego 12, 61-680 Poznań, Poland Andrzej Muszynski 2Institute of Geology, Adam Mickiewicz University, ul. Bogumiła Krygowskiego 12, 61-680 Poznań, Poland Roman Botcharnikov 1Institut für Mineralogie, Leibniz Universität Hannover, Callinstrasse 3, 30167 Hanover, Germany4Institut für Geowissenschaften, Johannes Guttenberg–Universität Mainz, J.-J. Becher Weg 21, 55128 Mainz, Germany Thomas Kuhn 5Bundesanstalt für Geowissenschaften und Rohstoffe, Stilleweg 2, 30655 Hanover, Germany *E-mail: j.ciazela@mineralogie.uni-hannover.de Publisher: Geological Society of America Received: 03 May 2017 Revision Received: 05 Jul 2017 Accepted: 06 Jul 2017 First Online: 04 Aug 2017 Online Issn: 1943-2682 Print Issn: 0091-7613 © 2017 Geological Society of America Geology (2017) 45 (10): 935–938. https://doi.org/10.1130/G39287.1 Article history Received: 03 May 2017 Revision Received: 05 Jul 2017 Accepted: 06 Jul 2017 First Online: 04 Aug 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Jakub Ciazela, Henry J.B. Dick, Juergen Koepke, Bartosz Pieterek, Andrzej Muszynski, Roman Botcharnikov, Thomas Kuhn; Thin crust and exposed mantle control sulfide differentiation in slow-spreading ridge magmas. Geology 2017;; 45 (10): 935–938. doi: https://doi.org/10.1130/G39287.1 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 Gabbroic veins enclosed in mantle peridotite from oceanic core complexes next to oceanic transform faults demonstrate sub-crustal crystallization of silicate minerals from a mid-oceanic ridge basalt (MORB)–like melt. Cooler lithosphere there may also affect sulfide crystallization and the metal budget of the lower and upper crust, but the related sulfide behavior is poorly understood. Here, we use chalcophile elements to trace sulfide crystallization in a suite of MORBs erupted at the Kane Megamullion south of the Kane Fracture Zone along the Mid-Atlantic Ridge. Cool lithosphere there is inferred from a low magma supply and lithostratigraphic evidence for thin crust with abundant mantle rock exposed to the seafloor. We show that the concentrations of Cu, Zn, As, Ga, Pb, Sb, and Tl in the Kane Megamullion MORBs rise linearly with melt differentiation expressed by decreasing MgO and Ni content. The low-pressure fractional crystallization within the crust thus occurs at sulfide-undersaturated conditions. Sulfide-undersaturated MORBs are unusual. At the Kane Megamullion, however, the thin crust allows melt to more extensively interact with the shallow and serpentinized mantle. We argue that sulfur and chalcophile elements have been lost from the melt due to sulfide crystallization during melt-rock reaction in the shallow mantle. 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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