Results 161 to 170 of about 5,853 (215)

The origin and tectonic setting of ophiolites in China

Journal of Asian Earth Sciences, 2008
Ophiolites are key features for unravelling the geologic history of orogenic belts, especially in China, which was formed by amalgamation of numerous tectonic blocks from Precambrian time to the present.
Zhou Mf, Paul T Robinson
exaly   +2 more sources

Four billion years of ophiolites reveal secular trends in oceanic crust formation [PDF]

Geoscience Frontiers, 2014
We combine a geological, geochemical and tectonic dataset from 118 ophiolite complexes of the major global Phanerozoic orogenic belts with similar datasets of ophiolites from 111 Precambrian greenstone belts to construct an overview of oceanic crust ...
Harald Furnes
exaly   +2 more sources

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Ophiolites

Geology Today, 1985
An ophiolite is an association of igneous and metamorphic rocks, including basalts, dolerites, gabbros and peridotites, which may be a fragment of crust and mantle formed by spreading at a ridge beneath an ancient ocean. This remarkable conclusion is supported by many features of the structure, field relationships, petrology and geochemistry of ...
openaire   +1 more source

Origin and emplacement of the ophiolite suite: Appalachian ophiolites in Newfoundland

Journal of Geophysical Research, 1971
The ophiolite suite is probably generated by axial plate accretion at oceanic ridges, and by diffuse slow spreading in marginal basins behind and within island arc complexes. The dunite/harzburgite component may represent the highest parts of a depleted upper mantle shell, about 16 km thick, from which a basaltic partial melt (approx.
John F. Dewey, John M. Bird
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Ophiolites and Their Origins

Elements, 2014
Ophiolites are suites of temporally and spatially associated ultramafic, mafic, and felsic rocks that are interpreted to be remnants of ancient oceanic crust and upper mantle. Ophiolites show significant variations in their internal structure, geochemical fingerprints, and emplacement mechanisms.
Y. Dilek, H. Furnes
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Suprasubduction-zone ophiolites: Is there really an ophiolite conundrum?

2008
Suprasubduction-zone ophiolites have been recognized in the geologic record for over thirty years. These ophiolites are essentially intact structurally and stratigraphi- cally, show evidence for synmagmatic extension, and contain lavas with geochemical characteristics of arc-volcanic rocks.
Rodney V. Metcalf, John W. Shervais
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Ophiolite obduction and the Samail Ophiolite: the behaviour of the underlying margin

Geological Society, London, Special Publications, 2003
Abstract Samail ophiolite emplacement has become a type-example for ophiolite obduction. Despite this, problems and controversy remain with respect to the age of high- P metamorphism, the vergence of structures in deformed rocks beneath the ophiolite, the suprasubduction character of the ophiolite and the
D. R. Gray, R. T. Gregory
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Oman Ophiolite: The Harzburgite Ophiolite Type

1989
Although the first detailed report on the Oman ophiolite is recent (Reinhardt, 1969), it is now one of the best studied complexes and is often considered to be the best example of ophiolites in the world. It is indeed the largest, with a crescent-shaped extension over 500 km in length and 50–100 km in width (fig.3.1 and 3.2).
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The Ballantrae ophiolite

Geological Magazine, 1973
SummaryThe Ballantrae complex, variously interpreted in the light of plate tectonics, is reappraised on the basis of comparisons with ophiolites of the Newfoundland Appalachians and the southwestern Pacific. All the main components of a typical ophiolite sequence can be recognized although the sequence has been greatly disturbed by post-emplacement ...
W. R. Church, R. A. Gayer
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Subduction-Zone Ophiolites and Island-Arc Ophiolites

1977
Although it is often said that typical ophiolites show a definite pseudostratigraphic sequence of rocks and occur in ancient subduction zones, most ophiolites showing a typical sequence occur outside subduction zones, and most ophiolites in subduction zones do not show a regular sequence.
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