| 台湾东部海域花东盆地的地质特征：位于欧亚板块和太平洋板块之间的新特提斯洋残余? |
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| 关键词:Huatung Basin Neo-Tethys tectonics |
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| Geological Significance of the Huatung Basin East off Taiwan: A Relic Neo-Tethys Ocean between the Eurasian Plate and the Modern Pacific Plate? |
| The Huatung Basin (20°30’-23°30’N/121°30’- 123°E; maximum water depth: 5500 m) locates east off Taiwan. It is bordered by the Coastal Range of Taiwan and the North Luzon Arc to the west, the West Philippine Sea to the east and the Ryukyu Trench to the north. The Huatung Basin was previ-ously regarded as a part of the Cenozoic Philippine Sea Plate (<50 Ma). However, Ar40/Ar39dating on amphibole in two dredged gabbro samples retrieved from the southern part of the Huatung Basin indi-cated that the Basin was early Cretaceous in age (115-121 Ma; Deschamps et al., 2000). This age is further supported by an independent micropaleon-tology study on some red chert xenoliths containing Early Cretaceous radiolarian fossils (115 Ma; Yeh and Cheng, 2001) in the Late Pleistocene volcanic sequences of the Lanyu Volcanic Island of the North Luzon Arc. The North Luzon Volcanic Arc was formed during the eastward subduction of the South China Sea oceanic lithosphere beneath the Huatung Basin since middle Miocene. Accordingly, the Mio-cene Luzon volcanic arc is sitting on the Cretaceous oceanic crust of the Huatung Basin. |
| Chi-yue HUANG.2012.Geological Significance of the Huatung Basin East off Taiwan: A Relic Neo-Tethys Ocean between the Eurasian Plate and the Modern Pacific Plate?[J].Acta Geoscientica Sinica,33(s1):23. |
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