Hydrothermal alteration of a seamount complex on La Palma, Canary Islands: Implications for metamorphism in accreted terranes

Research Article| February 01, 1994 Hydrothermal alteration of a seamount complex on La Palma, Canary Islands: Implications for metamorphism in accreted terranes P. Schiffman; P. Schiffman 1Department of Geology, University of California, Davis, California 95616 Search for other works by this author on: GSW Google Scholar H. Staudigel H. Staudigel 2Vrije Universiteit, Laboratory of Isotope Geology, 1081 HV Amsterdam, Netherlands3Institute of Geophysics and Planetary Physics, Scripps Institute of Oceanography, University of California, La Jolla, California 92093 Search for other works by this author on: GSW Google Scholar Author and Article Information P. Schiffman 1Department of Geology, University of California, Davis, California 95616 H. Staudigel 2Vrije Universiteit, Laboratory of Isotope Geology, 1081 HV Amsterdam, Netherlands3Institute of Geophysics and Planetary Physics, Scripps Institute of Oceanography, University of California, La Jolla, California 92093 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1994) 22 (2): 151–154. https://doi.org/10.1130/0091-7613(1994)022<0151:HAOASC>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation P. Schiffman, H. Staudigel; Hydrothermal alteration of a seamount complex on La Palma, Canary Islands: Implications for metamorphism in accreted terranes. Geology 1994;; 22 (2): 151–154. doi: https://doi.org/10.1130/0091-7613(1994)022<0151:HAOASC>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 SocietyGeology Search Advanced Search Abstract The hydrothermal metamorphism of a sequence of Pliocene-age seamount extrusive and volcaniclastic rocks on La Palma, Canary Islands, is characterized by a relatively complete low-pressure-high-temperature facies series encompassing the zeolite, prehnite-pumpellyite, and greenschist facies. The observed mineral zonations imply metamorphic gradients of 200-300 °C/km. The metamorphism of the seamount, at least in its core region, is distinct from ocean-floor metamorphism: the former is characterized by a serially continuous facies series encompassing zeolite, prehnite-pumpellyite, and greenschist assemblages, and the latter by a discontinuous metamorphic gradient in which prehnite-pumpellyite assemblages are absent. These metamorphic features, presumably reflecting fundamental thermal-tectonic differences between extending oceanic crust at mid- oceanic ridges vs. the more static crust underlying seamount volcanoes, should aid in the recognition of incoherent fragments of seamount metamorphic rocks within accreted terranes which typically have undergone subsequent higher pressure-temperature regional metamorphism, albeit to comparable grades. 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.