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GSA Special Papers
Ophiolites, Arcs, and Batholiths: A Tribute to Cliff Hopson
Author(s)
Geological Society of America

Volume
438
Copyright:
© 2008 Geological Society of America
Geological Society of America
ISBN print:
9780813724386
Publication date:
July 01, 2008
Book Chapter
Suprasubduction-zone ophiolites: Is there really an ophiolite conundrum?
Author(s)
Rodney V Metcalf
Department of Geoscience, University of Nevada–Las Vegas, Las Vegas, Nevada 89154-4010, USA
;
Rodney V Metcalf
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John W Shervais
Department of Geology, Utah State University, Logan, Utah 84322-4505, USA
John W Shervais
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Published:July 01, 2008
Suprasubduction-zone ophiolites have been recognized in the geologic record for over thirty years. These ophiolites are essentially intact structurally and stratigraphically, show evidence for synmagmatic extension, and contain lavas with geochemical characteristics of arc-volcanic rocks. They are now inferred to have formed by hinge retreat in the forearc of nascent or reconfigured island arcs. Emplacement of these forearc assemblages onto the leading edge of partially subducted continental margins is a normal part of their evolution. A recent paper has challenged this interpretation. The authors assert that the “ophiolite conundrum” (seafloor spreading shown by dike complexes versus arc geochemistry) can be...
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Index Terms/Descriptors
- Atlantic Ocean
- basalts
- chemical composition
- Chile Ridge
- crystallization
- East Pacific
- geochemistry
- hydration
- igneous rocks
- Indian Ocean
- island arcs
- isotopes
- Juan de Fuca Ridge
- lithosphere
- magmas
- magmatism
- major elements
- mantle
- melting
- Mid-Atlantic Ridge
- Mid-Indian Ridge
- mid-ocean ridge basalts
- mid-ocean ridges
- models
- North Pacific
- Northeast Pacific
- ocean floors
- ocean-island basalts
- oceanic lithosphere
- ophiolite
- ophiolite complexes
- Pacific Ocean
- peridotites
- petrology
- plate tectonics
- plutonic rocks
- Red Sea
- sea-floor spreading
- slabs
- South Atlantic
- South Pacific
- Southeast Indian Ridge
- Southeast Pacific
- spreading centers
- subduction
- subduction zones
- trace elements
- ultramafics
- volcanic rocks
- volcanism
- Woodlark Basin
Latitude & Longitude
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