New radiolarian ages from the Troodos ophiolite and their tectonic implications |
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| Authors: | Soichi Osozawa Makoto Okamura |
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| Institution: | Institute of Geology and Paleontology, Faculty of Science, Tohoku University, Sendai 980, Japan;Department of Geology, Faculty of Science, Kochi University, Kochi 780, Japan |
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| Abstract: | Abstract Newly obtained radiolarian biostratigraphic age combined with previous isotopic age of the Troodos ophiolite shows that the ophiolite becomes systematically younger from east to west: Turonian, early Campanian, and late Campanian. The youngest late Campanian part of the ophiolite is directly covered by the volcaniclastic sediment derived from an active island arc, whereas the older part is covered by pelagic radiolarite. These facts constitute evidence that the Troodos ophiolite was probably emplaced during the subduction of an active spreading ridge. |
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| Keywords: | ridge subduction sea floor spreading trench-trench-ridge triple junction Troodos ophiolite |
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