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New radiolarian ages from the Troodos ophiolite and their tectonic implications
Author(s) -
Osozawa Soichi,
Okamura Makoto
Publication year - 1993
Publication title -
island arc
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.554
H-Index - 58
eISSN - 1440-1738
pISSN - 1038-4871
DOI - 10.1111/j.1440-1738.1993.tb00070.x
Subject(s) - ophiolite , geology , geochemistry , subduction , pelagic sediment , island arc , paleontology , ridge , tectonics , pyroclastic rock , sediment , volcano
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.