Fluid flow and metasomatism in a subduction zone hydrothermal system: Catalina Schist terrane, California

Research Article| November 01, 1989 Fluid flow and metasomatism in a subduction zone hydrothermal system: Catalina Schist terrane, California Gray E. Bebout; Gray E. Bebout 1Department of Earth and Space Sciences, University of California, Los Angeles, California 90024-1567 Search for other works by this author on: GSW Google Scholar Mark D. Barton Mark D. Barton 1Department of Earth and Space Sciences, University of California, Los Angeles, California 90024-1567 Search for other works by this author on: GSW Google Scholar Author and Article Information Gray E. Bebout 1Department of Earth and Space Sciences, University of California, Los Angeles, California 90024-1567 Mark D. Barton 1Department of Earth and Space Sciences, University of California, Los Angeles, California 90024-1567 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1989) 17 (11): 976–980. https://doi.org/10.1130/0091-7613(1989)0172.3.CO;2 Article history First Online: 02 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 Gray E. Bebout, Mark D. Barton; Fluid flow and metasomatism in a subduction zone hydrothermal system: Catalina Schist terrane, California. Geology 1989;; 17 (11): 976–980. doi: https://doi.org/10.1130/0091-7613(1989)0172.3.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 SocietyGeology Search Advanced Search Abstract On Santa Catalina Island, southern California, blueschist to amphibolite facies metasedimentary, metamafic, and meta-ultramafic rocks show veining and alteration that reflect fluid flow and mass transfer at 25-45 km depths in an Early Cretaceous subduction zone. Synkinematic and postkinematic veins record fluid transport and metasomatism during prograde metamorphism and uplift. Vein and host-rock mineralogy and whole-rock compositions demonstrate large-scale chemical redistribution, especially of Si and alkali elements. Veins and host rocks trend toward isotopic equilibration with aqueous fluids with δ18OSMOW = +13‰ ± 1‰. The likely source for these fluids is in lower temperature, sediment-rich parts of the subduction zone. Carbon isotope systematics support this conclusion and indicate the influence of an organic C source. Quartz solubility relations indicate the importance of fluid-flow paths in chemical redistribution during subduction. These results document large-scale fluid flow and the complexity of possible metasomatic and mechanical mixing processes at intermediate levels of subduction zones. The record of subduction-zone mass transfer in the Catalina Schist is compatible with the record inferred for greater depths from geochemical and petrologic studies of arc magmatism. 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.