LI Canping, GOU Limin, YOU Jiachun, LIU Xuewei, OU Chuling. Further studies on the numerical simulation of bubble plumes in the cold seepage active region[J]. Acta Oceanologica Sinica, 2016, 35(1): 118-124. doi: 10.1007/s13131-016-0803-3
Citation: WANG Zhenfeng, SHI Xiaobin, YANG Jun, HUANG Baojia, SUN Zhen, WANG Yahui, JIANG Haiyan, YU Chuanhai, YANG Xiaoqiu. Analyses on the tectonic thermal evolution and influence factors in the deep-water Qiongdongnan Basin[J]. Acta Oceanologica Sinica, 2014, 33(12): 107-117. doi: 10.1007/s13131-014-0580-9

Analyses on the tectonic thermal evolution and influence factors in the deep-water Qiongdongnan Basin

doi: 10.1007/s13131-014-0580-9
  • Received Date: 2014-06-20
  • Rev Recd Date: 2014-09-29
  • To reveal the tectonic thermal evolution and influence factors on the present heat flow distribution, based on 154 heat flow data, the present heat flow distribution features of the main tectonic units are first analyzed in detail, then the tectonic thermal evolution histories of 20 profiles are reestablished crossing the main deep-water sags with a structural, thermal and sedimentary coupled numerical model. On the basis of the present geothermal features, the Qiongdongnan Basin could be divided into three regions: the northern shelf and upper slope region with a heat flow of 50-70 mW/m2, most of the central depression zone of 70-85 mW/m2, and a NE trending high heat flow zone of 85-105 mW/m2 lying in the eastern basin. Numerical modeling shows that during the syn-rift phase, the heat flow increases generally with time, and is higher in basement high area than in its adjacent sags. At the end of the syn-rift phase, the heat flow in the deepwater sags was in a range of 60-85 mW/m2, while in the basement high area, it was in a range of 75-100 mW/m2. During the post-rift phase, the heat flow decreased gradually, and tended to be more uniform in the basement highs and sags. However, an extensive magmatism, which equivalently happened at around 5 Ma, has greatly increased the heat flow values, and the relict heat still contributes about 10-25 mW/m2 to the present surface heat flow in the central depression zone and the southern uplift zone. Further analyses suggested that the present high heat flow in the deep-water Qiongdongnan Basin is a combined result of the thermal anomaly in the upper mantle, highly thinning of the lithosphere, and the recent extensive magmatism. Other secondary factors might have affected the heat flow distribution features in some local regions. These factors include basement and seafloor topography, sediment heat generation, thermal blanketing, local magmatic injecting and hydrothermal activities related to faulting and overpressure.
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