On tectonic problems of the Okinawa Trough

Li Nai-sheng

doi:10.1007/BF02850663

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On tectonic problems of the Okinawa Trough

Updated：2023-05-16

- On tectonic problems of the Okinawa Trough
- Journal of Oceanology and Limnology Vol. 19, Issue 3, Pages: 255-264(2001)
- Affiliations：
  
  Institute of Oceanology Chinese Academy of Sciences
- Author bio：
- Funds：
- DOI：10.1007/BF02850663
  CLC：
- Published：2001
- Accepted：
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Nai-sheng, L. On tectonic problems of the Okinawa Trough., Chin. J. Ocean. Limnol. 19, 255–264 (2001). https://doi.org/10.1007/BF02850663
DOI：

Nai-sheng, L. On tectonic problems of the Okinawa Trough., Chin. J. Ocean. Limnol. 19, 255–264 (2001). https://doi.org/10.1007/BF02850663 DOI：

摘要

Abstract

The Okinawa Trough is a very active tectonic zone at the margin of the Northwest Pacific and is typical of back-are-rifting at the young stage of tectonic evolution. Many scientists from Japan

China

Germany

France

the U.S.A. and Russia have done a lot of geologic and geophysical investigations there. It is well known that the Okinawa Trough is an active back-are rift with extremely high heat flow

very strong hydrothermal circulation

strong volcanic and magmatic activity

frequent earthquakes

rapid subsidence and rifting

well-developed fault and central graben. But up to now

there are still some important tectonic problems about the Okinawa Trough that require clarification on some aspects such as the type of its crust

its forming time

its tectonic evolution

the distribution of its central grabens

the relationship between its high heat flow and tectonic activity. Based on the data obtained from seismic survey

geomagnetic and gravity measurements

submarine sampling and heat flow measurements in the last 15 years

the author discusses the following tectonic problems about the Okinawa Trough: (1) If the Okinawa Trough develops oceanic crust or not. (2) Is the South Okinawa Trough tectonically more active than the North Okinawa Trough with shallower water and few investigation data on it. (3) The formation time of the Okinawa Trough and its tectonic evolution. The Okinawa Trough has a very thin continental crust. Up to now

there is no evidence of oceanic crust in the Okinawa Trough. The North

Middle and South Okinawa Trough are all very strongly active areas. From 6 Ma B. P.

the Okinawa Trough began to form. Since 2 Ma

the Okinawa Trough has been very active.

关键词

Keywords

references

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