Geochemical study of an early Paleozoic island-arc-back-arc basin system. Part 1: The Trinity Ophiolite (northern California)

Research Article| July 01, 1988 Geochemical study of an early Paleozoic island-arc-back-arc basin system. Part 1: The Trinity Ophiolite (northern California) MARC BROUXEL; MARC BROUXEL 1Centre de Recherches Pétrographiques et Géochimiques, BP 20, 54501 Vandoeuvre-les-Nancy cedex, France2Laboratoire de Pétrologie, U.A. 735, Université de Nancy 1, BP 239, 54506 Vandoeuvre-les-Nancy cedex, France Search for other works by this author on: GSW Google Scholar HENRIETTE LAPIERRE HENRIETTE LAPIERRE 2Laboratoire de Pétrologie, U.A. 735, Université de Nancy 1, BP 239, 54506 Vandoeuvre-les-Nancy cedex, France3Laboratoire de Géologie Structurale, Université d'Orléans, 45046 Orléans cedex, France Search for other works by this author on: GSW Google Scholar Author and Article Information MARC BROUXEL 1Centre de Recherches Pétrographiques et Géochimiques, BP 20, 54501 Vandoeuvre-les-Nancy cedex, France2Laboratoire de Pétrologie, U.A. 735, Université de Nancy 1, BP 239, 54506 Vandoeuvre-les-Nancy cedex, France HENRIETTE LAPIERRE 2Laboratoire de Pétrologie, U.A. 735, Université de Nancy 1, BP 239, 54506 Vandoeuvre-les-Nancy cedex, France3Laboratoire de Géologie Structurale, Université d'Orléans, 45046 Orléans cedex, France Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1988) 100 (7): 1111–1119. https://doi.org/10.1130/0016-7606(1988)100<1111:GSOAEP>2.3.CO;2 Article history First Online: 01 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 MARC BROUXEL, HENRIETTE LAPIERRE; Geochemical study of an early Paleozoic island-arc-back-arc basin system. Part 1: The Trinity Ophiolite (northern California). GSA Bulletin 1988;; 100 (7): 1111–1119. doi: https://doi.org/10.1130/0016-7606(1988)100<1111:GSOAEP>2.3.CO;2 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 SocietyGSA Bulletin Search Advanced Search Abstract A complete ophiolitic succession crops out along the easternmost exposure of the eastern Klamath Mountains (Trinity ultramafic sheet, ultrabasic-basic plutonic rocks, sheeted-dike complex, and basaltic pillow lavas). The ophiolitic succession is characterized by small amounts of iron enrichment, low titanium and incompatible trace-element contents, and depleted LREE patterns. The strong island-are geochemical affinities of the Trinity basatts and the εNd values of the ophiolitic succession ranging between 6.6 and 7.5 suggest that the Trinity ophiolite is the remnant of a back-arc basin located in the vicinity of an island arc. Important Sr-isotopic variations (εSr range between -17.3 and 23.6), contrasting with the rather constant εNd values, suggest that sea-water interaction occurred. The calculated water/rock ratios, ranging between 0 and 10, show that the hydrothermal activity was maximal in the high-level gabbros, just below the sheeted-dike complex. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.