Journal of Tropical Oceanography >
Research progress on the Zhongnan-Liyue Fault Zone in the South China Sea Basin*
Received date: 2018-04-27
Request revised date: 2018-11-27
Online published: 2019-04-15
Supported by
National Natural Science Foundation of China (41606080, 41576068)
Natural Science Foundation of Guangdong Province, China (2017A030312002)
China Geological Survey Program (GZH201400202, 1212011220117, DD20160138, GZH201400203, 121201002000150002, DD20160140, and DD20189642)
Key Laboratory of Marine Mineral Resources, Ministry of Land and Resources (KLMMR-2013-A-10)
Copyright
In this paper, we review latest research on the Zhongnan-Liyue Fault Zone (ZLFZ), and then analyze the spatial distribution and tectonic deformation feature of the ZLFZ based on the geophysical data including topographic, seismic, gravity, and magnetic data. The results show that the ZLFZ in the South China Sea Basin has obvious north-south segmentation characteristics. The north section, which is between northwest sub-basin and east sub-basin, is a NNW trend narrow zone with a width of ~16 km from (18°00'N, 115°30'E) to (17°30'N, 116°30'E). The south section, which is between southwest sub-basin and east sub-basin, is a NNW trend wide zone with a width of 60~80 km from the east of the Zhongsha Bank to the west of the Liyue Bank. The main fault of the ZLFZ is NNW trend along the seamounts’ ridge of Zhongnan. The ZLFZ of transition region is NNE trend from the north section to the south section. On the eastern and western sides of the ZLFZ, the sub-basin’s sedimentary thickness and oceanic crust thickness are obviously different. We speculate that the ZLFZ plays an important role in the geological structure of sub-basin. According to the change of crustal structure, we suspect that the ZLFZ is at least a crustal fracture zone.
XU Ziying , WANG Jun , GAO Hongfang , SUN Guihua , SUN Meijing , NIE Xin , ZHU Rongwei . Research progress on the Zhongnan-Liyue Fault Zone in the South China Sea Basin*[J]. Journal of Tropical Oceanography, 2019 , 38(2) : 86 -94 . DOI: 10.11978/2018048
Fig. 1 The bathymetric map of the South China Sea and the location of the Zhongnan-Liyue Fault Zone图1 南海地形图(杨胜雄 等, 2015)及中南—礼乐断裂在南海海盆中的位置分布图 |
Fig. 2 Seismic profile characteristics of the Zhongnan-Liyue Fault Zone along the survey line L1图2 中南—礼乐断裂带在测线L1地震剖面反射特征 |
Fig. 3 Location of the Zhongnan-Liyue Fault Zone according to magnetic anomalies图3 中南—礼乐断裂带在南海海盆磁异常图上的分布位置 |
Fig. 4 Location of the Zhongnan-Liyue Fault Zone according to the free-air gravity anomalies图4 中南—礼乐断裂带在南海海盆空间重力异常图上的分布位置 |
Fig. 5 Seismic profile characteristics of the Zhongnan-Liyue Fault Zone along the survey line L2图5 中南—礼乐断裂带在测线L2上的地震剖面反射特征 |
Fig. 6 Seismic profile characteristics of the Zhongnan-Liyue Fault Zone along the survey line L3图6 中南—礼乐断裂带在测线L3上的地震剖面反射特征 |
Fig. 7 Analytical signal module calculated from magnetic anomalies of the South China Sea Basin图7 南海海盆磁异常解析信号模 |
The authors have declared that no competing interests exist.
[1] |
|
[2] |
|
[3] |
|
[4] |
|
[5] |
|
[6] |
|
[7] |
|
[8] |
|
[9] |
|
[10] |
|
[11] |
|
[12] |
|
[13] |
|
[14] |
|
[15] |
|
[16] |
|
[17] |
|
[18] |
|
[19] |
|
[20] |
|
[21] |
|
[22] |
|
[23] |
|
[24] |
|
[25] |
|
/
〈 |
|
〉 |