中国东部海域及周边地壳热流初探

PRIMARY STUDY ON HEAT FLOW AROUND THE SEA AREA OFF EASTERN CHINA

本文根据在117°～135°E,21°50′～41°30′N范围内的500多个热流值,对中国东部海域及周边的热流分布特征及其与地质构造的关系进行了讨论。热流分析表明,冲绳海槽具有极高的热流值,为一现在正在活动的弧后张裂带。

This paper discussed about the 550 geothermal data obtained from the sea area off Eastern China. Based on the analysis for heat flow data, it is known that there is almost no heat flow in the Bohai Sea, Yellow Sea and East China Sea. There are very great heat flows in the Okinawa Trough, the highest value is 1 581 mW/m2 and the mean value in one longitude and latitude area is 806.4 mW/m2. The heat flow distribution reveals the crustal active time, earthquake activity in continental crust, volcanic eruption in continental margin and deep crustal structure. The heat flow profile of Ryukyu T-A-BA system reflects the geothermal machanism of subduction and convergent between the Philippine plate and conti-nental crust of the East China Sea.