FAULT BELTS AND IGNEOUS ROCKS OF THE OKINAWA TROUGH AND ADJACENT AREAS:EVIDENCE FROM GRAVITY AND MAGNETIC DATA

SHANG Luning; ZHANG Xunhua; HAN Bo

doi:10.16562/j.cnki.0256-1492.2016.01.009

Marine Geology & Quaternary Geology > 2016 > 36(1): 99-106. > DOI: 10.16562/j.cnki.0256-1492.2016.01.009

SHANG Luning, ZHANG Xunhua, HAN Bo. FAULT BELTS AND IGNEOUS ROCKS OF THE OKINAWA TROUGH AND ADJACENT AREAS:EVIDENCE FROM GRAVITY AND MAGNETIC DATA[J]. Marine Geology & Quaternary Geology, 2016, 36(1): 99-106. DOI: 10.16562/j.cnki.0256-1492.2016.01.009

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FAULT BELTS AND IGNEOUS ROCKS OF THE OKINAWA TROUGH AND ADJACENT AREAS:EVIDENCE FROM GRAVITY AND MAGNETIC DATA

1. College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100;
2. Function Laboratory for Marine Mineral Resource Geology and Exploration, Qingdao National Oceanography Laboratory, Qingdao 266000;
3. Institute of Marine Geology, Qingdao 266071

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Received Date: March 08, 2015
Revised Date: April 09, 2015

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Abstract

Abstract

The Okinawa Trough is an active tectonic area with widespread faults and igneous rock bodies. In order to study the characteristics of the fault belts and igneous rocks, we calculated the vertical and horizontal derivatives of gravity and magnetic anomalies on 1:1000000 scale. The results show that there are two groups of fault belts distributed in the Trough and adjacent areas, running parallel and perpendicular to the trough, respectively. The NW and NWW trending fault belts, which are perpendicular to the trough itself, are mainly strike-slip faults, formed in earlier time and gradually propagated southeastward together with the tectonic evolution of the East China Sea. Influenced by the tectonic stress fields in different periods, the strike of the fault belts changed from west to east, making the fault belts bulged northeastward. The igneous rocks are distributed in several belts. The belt located in the eastern side of the trough, which extends from Kyushu to Taiwan, is corresponding to the Ryukyu volcanic front. Another belt located on the eastern margin of the shelf, which corresponds to the Diaoyudao uplift, terminates to the south by one of the NW trending fault belts near 27°N. The Igneous rock belt located in the axial part of the southern Okinawa Trough is related to the rifting process. The tectonic nature of the Taibei-Diaoyudao volcanic belt is different from the Diaoyudao uplift to the north.
- Okinawa Trough,
- gravity and magnetic anomalies,
- derivative calculation,
- fault belts,
- igneous rocks

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References

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FAULT BELTS AND IGNEOUS ROCKS OF THE OKINAWA TROUGH AND ADJACENT AREAS:EVIDENCE FROM GRAVITY AND MAGNETIC DATA