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The role of serpentinite-derived fluids in metasomatism of the Colorado Plateau (USA) lithospheric mantle

2017; Geological Society of America; Volume: 45; Issue: 12 Linguagem: Inglês

10.1130/g39444.1

1943-2682

Edward W. Marshall, Jaime D. Barnes, John Lassiter,

High-pressure geophysics and materials

Research Article| October 11, 2017 The role of serpentinite-derived fluids in metasomatism of the Colorado Plateau (USA) lithospheric mantle Edward W. Marshall; Edward W. Marshall * 1Department of Geological Sciences, Jackson School of Geosciences, University of Texas at Austin, 2275 Speedway Stop C9000, Austin, Texas 78712, USA *E-mail:edmarshall4@utexas.edu Search for other works by this author on: GSW Google Scholar Jaime D. Barnes; Jaime D. Barnes 1Department of Geological Sciences, Jackson School of Geosciences, University of Texas at Austin, 2275 Speedway Stop C9000, Austin, Texas 78712, USA Search for other works by this author on: GSW Google Scholar John C. Lassiter John C. Lassiter 1Department of Geological Sciences, Jackson School of Geosciences, University of Texas at Austin, 2275 Speedway Stop C9000, Austin, Texas 78712, USA Search for other works by this author on: GSW Google Scholar Geology (2017) 45 (12): 1103–1106. https://doi.org/10.1130/G39444.1 Article history received: 26 Jun 2017 rev-recd: 07 Sep 2017 accepted: 09 Sep 2017 first online: 11 Oct 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Tools Icon Tools Get Permissions Search Site Citation Edward W. Marshall, Jaime D. Barnes, John C. Lassiter; The role of serpentinite-derived fluids in metasomatism of the Colorado Plateau (USA) lithospheric mantle. Geology 2017;; 45 (12): 1103–1106. doi: https://doi.org/10.1130/G39444.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search nav search search input Search input auto suggest search filter All ContentBy SocietyGeology Search Advanced Search Abstract Subducting serpentinized lithosphere has distinct δD and δ18O values compared to normal mantle. Slab-derived fluids that infiltrate the mantle wedge can alter its oxygen and hydrogen isotope composition, raising or lowering the δ18O and δD values depending on the nature of the subducted components. Hydrous minerals in peridotite xenoliths from the Colorado Plateau (southwestern USA) have δD values (up to −33‰) much higher than average mantle (−80‰), but similar to δD values of olivine-hosted melt inclusions within arc basalts, suggesting a slab-derived fluid source. Oxygen isotope ratios of olivine from these xenoliths are similar to average mantle, yet display a strong negative correlation with clinopyroxene Ce/Sm, a proxy of metasomatism. This correlation is most simply explained by metasomatism from fluids derived from the serpentinized portion of the Farallon slab. Although δ18O values of mantle minerals span a narrow range, integration of stable isotope data with other geochemical tracers can provide new constraints on modern and ancient subduction-related processes, potentially providing a method for probing Archean lithospheric mantle for evidence of early subduction. You do not currently have access to this article.