The Vourinos Ophiolite, Greece: Cyclic Units of Lineated Cumulates Overlying Harzburgite Tectonite

Abstract

Research Article| March 01, 1975 The Vourinos Ophiolite, Greece: Cyclic Units of Lineated Cumulates Overlying Harzburgite Tectonite EVERETT D. JACKSON; EVERETT D. JACKSON 1U.S. Geological Survey, Menlo Park, California 94025 Search for other works by this author on: GSW Google Scholar HARRY W. GREEN, II; HARRY W. GREEN, II 2Department of Geology, University of California, Davis, California 95616 Search for other works by this author on: GSW Google Scholar ELDRIDGE M. MOORES ELDRIDGE M. MOORES 2Department of Geology, University of California, Davis, California 95616 Search for other works by this author on: GSW Google Scholar Author and Article Information EVERETT D. JACKSON 1U.S. Geological Survey, Menlo Park, California 94025 HARRY W. GREEN, II 2Department of Geology, University of California, Davis, California 95616 ELDRIDGE M. MOORES 2Department of Geology, University of California, Davis, California 95616 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1975) 86 (3): 390–398. https://doi.org/10.1130/0016-7606(1975)86<390:TVOGCU>2.0.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 EVERETT D. JACKSON, HARRY W. GREEN, ELDRIDGE M. MOORES; The Vourinos Ophiolite, Greece: Cyclic Units of Lineated Cumulates Overlying Harzburgite Tectonite. GSA Bulletin 1975;; 86 (3): 390–398. doi: https://doi.org/10.1130/0016-7606(1975)86<390:TVOGCU>2.0.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 Re-examination of the Vourinos ophiolite shows it to be composed of metamorphic tectonites, cumulates, plagiogranites, dikes, and lava. The contact between the tectonites and the cumulates is exposed and sharp. Beneath the cumulate contact, the rocks have been highly deformed and complexly folded; above that contact, they simply have been tilted vertically to expose a stratiform complex 1,500 m (4,800 ft) thick. The stratiform intrusion is characterized by cyclic units, rich in olivine at the base, and rich in feldspar at the top. Some cumulus diorites are present at the top of the section which grade into quartz diorites (plagiogranites) with hypautomorphic textures. Lineate lamination characterizes the cumulates and may indicate the direction or orientation of the Mesozoic mid-oceanic ridge crest with respect to the present position of the complex. A siliceous dike swarm cuts the upper part of the stratiform complex. The section suggests that in the case of Vourinos, a large magmatic chamber formed at a mid-oceanic ridge crest and that intrusion was a much more important process than extrusion in the formation of oceanic crust in that area. The reported presence of cumulates in many other ophiolite complexes suggests that these relations may obtain generally at most or all spreading ridges. The contact between the tectonites and the cumulates of the complex would not have corresponded with seismic M. 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.