Portal de Periódicos da CAPES

Origin of the dunitic mantle-crust transition zone in the Oman ophiolite: The interplay between percolating magmas and high-temperature hydrous fluids

2017; Geological Society of America; Volume: 45; Issue: 5 Linguagem: Inglês

10.1130/g38778.1

1943-2682

Mathieu Rospabé, Georges Ceuleneer, Mathieu Benoît, Bénédicte Abily, P. Pinet,

earthquake and tectonic studies

Research Article| May 01, 2017 Origin of the dunitic mantle-crust transition zone in the Oman ophiolite: The interplay between percolating magmas and high-temperature hydrous fluids Mathieu Rospabé; Mathieu Rospabé 1GET, Observatoire Midi Pyrénées, Université de Toulouse, CNRS, IRD, 14 avenue E. Belin, 31400 Toulouse, France Search for other works by this author on: GSW Google Scholar Georges Ceuleneer; Georges Ceuleneer 1GET, Observatoire Midi Pyrénées, Université de Toulouse, CNRS, IRD, 14 avenue E. Belin, 31400 Toulouse, France Search for other works by this author on: GSW Google Scholar Mathieu Benoit; Mathieu Benoit 1GET, Observatoire Midi Pyrénées, Université de Toulouse, CNRS, IRD, 14 avenue E. Belin, 31400 Toulouse, France Search for other works by this author on: GSW Google Scholar Bénédicte Abily; Bénédicte Abily 1GET, Observatoire Midi Pyrénées, Université de Toulouse, CNRS, IRD, 14 avenue E. Belin, 31400 Toulouse, France Search for other works by this author on: GSW Google Scholar Patrick Pinet Patrick Pinet 2IRAP, Observatoire Midi Pyrénées, Université de Toulouse, CNRS, IRD, 14 avenue E. Belin, 31400 Toulouse, France Search for other works by this author on: GSW Google Scholar Author and Article Information Mathieu Rospabé 1GET, Observatoire Midi Pyrénées, Université de Toulouse, CNRS, IRD, 14 avenue E. Belin, 31400 Toulouse, France Georges Ceuleneer 1GET, Observatoire Midi Pyrénées, Université de Toulouse, CNRS, IRD, 14 avenue E. Belin, 31400 Toulouse, France Mathieu Benoit 1GET, Observatoire Midi Pyrénées, Université de Toulouse, CNRS, IRD, 14 avenue E. Belin, 31400 Toulouse, France Bénédicte Abily 1GET, Observatoire Midi Pyrénées, Université de Toulouse, CNRS, IRD, 14 avenue E. Belin, 31400 Toulouse, France Patrick Pinet 2IRAP, Observatoire Midi Pyrénées, Université de Toulouse, CNRS, IRD, 14 avenue E. Belin, 31400 Toulouse, France Publisher: Geological Society of America Received: 08 Nov 2016 Revision Received: 06 Jan 2017 Accepted: 09 Jan 2017 First Online: 28 Jun 2017 Online Issn: 1943-2682 Print Issn: 0091-7613 © 2017 Geological Society of America Geology (2017) 45 (5): 471–474. https://doi.org/10.1130/G38778.1 Article history Received: 08 Nov 2016 Revision Received: 06 Jan 2017 Accepted: 09 Jan 2017 First Online: 28 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Mathieu Rospabé, Georges Ceuleneer, Mathieu Benoit, Bénédicte Abily, Patrick Pinet; Origin of the dunitic mantle-crust transition zone in the Oman ophiolite: The interplay between percolating magmas and high-temperature hydrous fluids. Geology 2017;; 45 (5): 471–474. doi: https://doi.org/10.1130/G38778.1 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 Determining which petrological processes build the mantle-crust dunitic transition zone (DTZ) in oceanic spreading settings has a direct impact on our understanding of thermal and chemical transfers on Earth. We report on understated but widespread mineral assemblages present in the DTZ at the top of a mantle diapir (Oman ophiolite), including pargasite, grossular, and pyroxenes of peculiar composition. These minerals are present interstitially between olivines and as inclusions in the disseminated chromite grains, indicating that they are early, high-temperature features. They call for hybridization between the mid-oceanic ridge basalt melts that fed the crustal section and supercritical water saturated with silica. Our synoptic survey (∼300 samples collected along 11 cross sections) demonstrates that the DTZ was pervasively infiltrated by such hybrid melts and that the abundance of their crystallization products increases upsection, likely in response to increasing supply of water and decreasing temperature. This indicates that water is involved in the reaction leading to the transformation of mantle harzburgite into dunite in the DTZ. On the basis of field evidence, a hydrothermal origin of the water is a reasonable hypothesis. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.