Majoritic garnets monitor deep subduction fluid flow and mantle dynamics

Research Article| January 01, 2008 Majoritic garnets monitor deep subduction fluid flow and mantle dynamics M. Scambelluri; M. Scambelluri 1Dipartimento per lo Studio del Territorio e delle sue Risorse, University of Genova, Corso Europa 26, 16132 Genova, Italy Search for other works by this author on: GSW Google Scholar T. Pettke; T. Pettke 2University of Bern, Institute of Geological Sciences, Baltzerstrasse 1+3, CH-3012 Bern, Switzerland Search for other works by this author on: GSW Google Scholar H.L.M. van Roermund H.L.M. van Roermund 3Institute of Earth Sciences, Utrecht University, Budapestlaan 4 3508 TA, Utrecht, Netherlands Search for other works by this author on: GSW Google Scholar Author and Article Information M. Scambelluri 1Dipartimento per lo Studio del Territorio e delle sue Risorse, University of Genova, Corso Europa 26, 16132 Genova, Italy T. Pettke 2University of Bern, Institute of Geological Sciences, Baltzerstrasse 1+3, CH-3012 Bern, Switzerland H.L.M. van Roermund 3Institute of Earth Sciences, Utrecht University, Budapestlaan 4 3508 TA, Utrecht, Netherlands Publisher: Geological Society of America Received: 04 May 2007 Revision Received: 06 Sep 2007 Accepted: 12 Sep 2007 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 The Geological Society of America, Inc. Geology (2008) 36 (1): 59–62. https://doi.org/10.1130/G24056A.1 Article history Received: 04 May 2007 Revision Received: 06 Sep 2007 Accepted: 12 Sep 2007 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation M. Scambelluri, T. Pettke, H.L.M. van Roermund; Majoritic garnets monitor deep subduction fluid flow and mantle dynamics. Geology 2008;; 36 (1): 59–62. doi: https://doi.org/10.1130/G24056A.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 ultradeep mantle rocks of western Norway display three generations of majoritic garnet. The first two derive from incompatible element–depleted transition-zone mantle and exsolved pyroxene components during Archean upwelling, accretion to subcratonic lithosphere (M1 stage), and isobaric cooling until the Middle Proterozoic (M2). A subsequent Scandian (430–390 Ma) subduction cycle initiated diamond crystallization (M3). Here we report a third majoritic garnet crystallized at grain boundaries and in microfractures, and stable with pyroxene, phlogopite, and spinel in the M3 assemblage. The trace element signatures of M3 minerals indicate crustal metasomatism, phlogopite being the main large ion lithophile element repository. These features imply majorite crystallization from crust-derived subduction fluids at 200 km depth. Our finding fixes the deepest occurrence of free subduction fluid phases and indicates that garnet is a reliable monitor of deep mantle evolution and fluid-mediated chemical recycling. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.