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Ophiolite and island-arc volcanism in Costa Rica

1979; Geological Society of America; Volume: 90; Issue: 5 Linguagem: Inglês

10.1130/0016-7606(1979)90 2.0.co;2

1943-2674

CARLOS GALLI-OLIVIER,

Botany and Geology in Latin America and Caribbean

Research Article| May 01, 1979 Ophiolite and island-arc volcanism in Costa Rica CARLOS GALLI-OLIVIER CARLOS GALLI-OLIVIER 1Central American School of Geology, University of Costa Rica, Apartado Postal 35, Ciudad Universitaria "Rodrigo Facio," Costa Rica Search for other works by this author on: GSW Google Scholar Author and Article Information CARLOS GALLI-OLIVIER 1Central American School of Geology, University of Costa Rica, Apartado Postal 35, Ciudad Universitaria "Rodrigo Facio," Costa Rica Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1979) 90 (5): 444–452. https://doi.org/10.1130/0016-7606(1979)90 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 Email Permissions Search Site Citation CARLOS GALLI-OLIVIER; Ophiolite and island-arc volcanism in Costa Rica. GSA Bulletin 1979;; 90 (5): 444–452. doi: https://doi.org/10.1130/0016-7606(1979)90 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 The Pacific margin of Costa Rica is a very deformed basement terrane of ophiolite composed of pillowed and massive basalt, mafic and ultramafic plutonic rocks, volcanic breccia, hyaloclastite, radiolarian chert, and limestone. The ophiolite underwent changes through burial metamorphism after subduction of the Cocos plate under the southwestern margin of the Caribbean plate. In some areas the ophiolite is a mélange. While the age of the emplacement of the ophiolite in northwestern Costa Rica is late Santonian to early Campanian, the period of accumulation of the ophiolite seems to be very long, possibly extending from middle Tithonian to late Santonian. New age determinations based on foraminifera and radiolaria support the previous dating. A relative scarcity of turbidite in the ophiolite of Costa Rica, compared to other similar terranes of the Pacific margin, has been associated with the intra-oceanic origin of the southern Central American arc.The island-arc suite clastic rocks first unconformably covered the ophiolite in Costa Rica in early Campanian time. Their origin is closely related to the intrusive and volcanic activity of a plutonic-volcanic arc located between South and North America since early Campanian time. The clastic rocks of the island-arc suite are low-porosity volcanogenic types. Limestone has accumulated from Cretaceous time to the present, in some areas forming porous biohermal bodies. Vertical tectonics originated marginal- and intra-arc sedimentary basins intermittently throughout the evolution of the arc. A fourfold geotectonic division of Costa Rica is proposed. 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.