The tectonics beneath the Okinawa Trough |
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| Authors: | Jin Xianglong |
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| Institution: | (1) Institute of Oceanology, Academia Sinica, Qingdao |
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| Abstract: | The nature of the crust of the Okinawa Trough is different from that of the continental shelf in the East China Sea. The crust
beneath the Trough is in transformation from continental to oceanic and the depth of MOHO in the northern section of the Trough
is deeper than in the southern section. Thick sedimentary strata of Neogene and Pleistocene ages are deposited in the Okinawa
Trough, and divided into three layers: the upper horizontal layer, the middle layer lightly folded and the lower deformed
layer. They were formed in Pleistocene, Pliocene, and Miocene to Paleogene, respectively. The tectonic movement in the southern
section is stronger than that in the northern section. Some volcanic seamounts appear on the bottom of the Trough. On both
slopes of the Trough are developed many normal faults and the intrusive igneous rocks. The Okinawa Trough, the back-arc basin,
is an embryonic marginal basin in rifting and spreading. The formation of the Okinawa Trough started in the early Pliocene.
The transformation of crust and the growth of the Trough progressed from the southern to the northern section. The southern
section is a true trough in tectonic sense.
Contribution No. 986 from the Institute of Oceanology, Academia Sinica.
The paper was presented in the PS-11 of IAPSO Symposium, 18th General Assembly IUGG, Hamburg, 22 August 1983. |
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