东海及琉球沟弧盆系的海底热流测量与热流分布  

Heat flow measurement and distribution of East China Sea and Ryukyu Trench Arc Back-Arc system

作　　者：栾锡武[1] 张训华[2] 

机构地区：[1]中国科学院海洋研究所,青岛266071 [2]青岛海洋地质研究所,青岛266071

出　　处：《地球物理学进展》2003年第4期670-678,共9页Progress in Geophysics

基　　金：国家自然科学基金项目(40006004);科技部国际合作项目;973项目(G200004670303)资助.

摘　　要：　利用钻井资料获得了东海陆架地区15个热流值.分析了海底热流测量的误差来源及数据精度.对东海及琉球沟弧盆系的热流值进行了分类整理,将海底热流分为可信热流值、较可信热流值和参考热流值.本文使用了前两类热流数据,共得305个.对研究区的热流站位进行了分析,发现热流测站分布很不均匀,冲绳海槽几个高热流异常区的热流测站总数占全部东海热流测站的一半多,仍有相当一些构造单元热流站位很少或者几乎没有热流值.总体上,研究区的热流分布明显地和沟弧盆系的构造特征相吻合,呈现北东向条带状分布.东海陆架为正常热流值区,冲绳海槽为高热流异常区,琉球群岛为正常热流值区,琉球海沟和菲律宾海都为低热流异常值区.根据热流推测冲绳海槽下存在深部热物质上拱,琉球海沟垭口之下存在海洋板块的俯冲.本研究区自东向西初步表现出长波长热流振荡现象,但由于测量数据稀少,目前还不能对此作更进一步的研究.15 new heat flow data was added to the East China Sea Shelf.The sea floor heat flow data error was analyzed.Heat flow data set from East China Sea and Ryukyu Trench Arc Back-Arc system was complied and classed.Totally 305 reliable and relatively reliable heat flow data was used in this paper.The distribution of heat flow stations were first tested,and found that they are far from dense enough and uniform.The heat flow model is closely related to the tectonic model,showing a NE banding . Both the East China Sea Shelf and Ryukyu Island area have a normal heat flow value,Okinawa Trough has high heat flow anomaly,and Ryukyu Trench and Philippine Sea area have a low heat flow anomaly,with the lowest heat flow area in the west slope trench area.Based on the heat flow distribution model the paper point out that there are hot material upwelling under the Okinawa Trough and there are cold Philippine plate subduction under the trench slope area.This paper also find a heat flow long wavelength oscillation from East to West based on the existing data set.

关 键 词：东海及琉球沟弧盆系 海底热流 测量 分布 

分 类 号：P738[天文地球—海洋地质] P314[天文地球—海洋科学]