西太平洋边缘海盆的形成与演化  

FORMATION AND EVOLUTION OF MARGINAL BASINS IN THE WESTERN PACIFIC

作　　者：赵会民[1] 吕炳全[1] 孙洪斌[2] 王红罡[1] 徐国强[1] 

机构地区：[1]同济大学海洋地质与地球物理系,上海200092 [2]辽河油田公司勘探开发研究院

出　　处：《海洋地质与第四纪地质》2002年第1期57-62,共6页Marine Geology & Quaternary Geology

摘　　要：从地球深部地幔流动引起的地质作用出发 ,结合裂谷的发展演化规律 ,认为地幔向东 (或南东 )的蠕散和流动促使亚洲大陆边缘地壳拉伸、变薄以致破裂 ,由大陆裂谷发展至弧后裂谷 ,形成西太平洋边缘海盆。最后提出边缘海盆发展演化的 4个阶段 ,即 :新生阶段 (郯庐裂谷系 )、幼年阶段 (冲绳海槽 )、青壮年阶段 (日本海 )和成熟阶段 (南海 )There exist in the western Pacific more than 75% marginal basins of the world. These basins are characterized by high heat flow values, plus gravitational anomaly, thinned crust, the belt of field anomaly and violent volcano and earthquake movement, which is compactly connected with deep mantle movement. All traces show that the formation of the basin is controlled by the geological process in the deep earth. The geological processes of the deep earth, particularly mantle movement, decide evolution and variation of lithosphere. The formation of the marginal basins in the western Pacific is connected with the deep mantle movement. Its way of expansion shows some unification. The expansion age is mainly in the late Oligocene to early Miocene. The mantle flow is dynamics of the formation of the marginal basins in the western Pacific. The formation of the marginal basins is controlled by the mantle flow. Research shows that the direction of the mantle flow is from Asia continent to marginal sea.Based on the recognition that the mantle flow from the deep earth results in geological process,together with the evolution law of the rift,this paper reaches the following conclusion. It is the mantle creeping or flowing to the east(or the southeast)that makes the crusts of marginal basins in Asian continental margin extend,thin and rift,completing the process from continental rift, back-arc rift and marginal basins in the western Pacific. Finally,four evolution stages of the said basins are summed up, namely,the newborn stage,the childhood stage,the young stage,and the mature stage. In different evolution stages, the characteristics of these basins are very different, for example crustal structure, heat flow values, gravitational anomaly, and volcano and earthquake movement etc. The newborn stage is the developmental stage of continental rift. During the newborn stage when the continental margin begins to extend, the heat flow values are higher than that of continents, and crustal thickness is slightly getting thin, but the

关 键 词：边缘海盆 裂谷 地幔流 蠕散 西太平洋 形成 演化 

分 类 号：P736.1[天文地球—海洋地质]