东海地区地热场综述

综述了东海地区地热场的特征及研究进展,根据收集的各航次热流值资料,绘制了东海地区的热流值分布图,并根据热流值的分布特点将东海地区分为陆架区、冲绳海槽区、琉球岛弧和海沟区、菲律宾海盆区等4个区块,详细分析了它们的热流分布成因,在已有的东海南北热结构模型基础上对东海南北热结构差异进行了分析。南冲绳海槽区的地壳热流值和地壳减薄程度都明显高于北冲绳海槽及其它各区,说明高热流值起源于地幔抬升和地壳的减薄,东海的扩张已经从冲绳海槽北部转移到南部。

Summarization of studies on the geothermal field in the East China Sea

Various geological and geophysical methods have been applied to investigate the geothermal field in the East China in the last decades.Thus,the structural evolvement can be recognized.This article mainly discusses methods used in the geothermal study.It gives a geothermal distribution model of the East China Sea based on the data collected from the former cruise investigations.According to the results calculated from the model,the East China Sea can be divided into four parts: continental shelf,Okinawa trough,Ryukyu fosse and island arc and Philippine sea basin.Characteristics of geothermal profiles suggest that high values of heat flow result from the mantle uplifting and the crust thickness reducing.The value of heat flow and the reducing degree of the thickness in the south part of the Okinawa trough are higher than those in the north part,indicating that the expansion of the East China Sea has been transferred from the north part of the Okinawa trough to the south part.