西太平洋雅浦俯冲带的地貌及地层结构特征

发布时间：2018-03-07 20:12

本文选题：雅浦海沟　切入点：加罗林海　出处：《海洋地质与第四纪地质》2017年01期 　论文类型：期刊论文

【摘要】：2015年中科院海洋所在西太平洋雅浦海域首次开展了综合地球物理调查,并同步采集了重磁震及多波束、浅地层剖面等数据,主要利用采集的多道地震剖面及多波束数据研究了雅浦俯冲带主要构造单元的地貌及沉积地层结构特征,并进一步探讨了加罗林洋脊俯冲作用下的构造特征。研究表明弧后的帕里西维拉盆地为区域沉积中心,最厚处可能发育近千米沉积层,而雅浦海沟内未发育明显水平沉积,以俯冲侵蚀作用为主;加罗林俯冲板片之上的加罗林洋脊因其特殊的地形地貌改造了俯冲带的构造发育特征,可能造成了岛弧岩浆作用的南、北部差异;揭示了雅浦海沟北段的地貌及地质结构细节特征,认为加罗林洋脊的高地形可能导致了海沟附近的俯冲板片更大的挠曲拉张量,从而形成垒堑构造带;为索罗尔海槽的盆地张裂结构提供了多道地震剖面证据,并推测了海槽的形成年代。
[Abstract]:In 2015, the Chinese Academy of Sciences conducted the first comprehensive geophysical survey in the Yapu sea area of the western Pacific Ocean, where the ocean is located, and simultaneously collected gravity, magnetic and multi-beam data, shallow stratigraphic profiles, and so on. The geomorphological and sedimentary stratigraphic characteristics of the main tectonic units in the Yapu subduction zone are studied by using the collected multi-channel seismic profiles and multi-beam data. Furthermore, the structural characteristics of the Galorin ridge under subduction are discussed. The results show that the back-arc Palissilvila basin is the regional sedimentary center, and the thickest part of the basin may be near km sedimentary layer, but there is no obvious horizontal deposition in the Yapu trench. Because of its special landform and geomorphology, the Carolyn ridge has transformed the structural development characteristics of the subduction zone, which may cause the difference of the island arc magmatism between the south and the north. The detailed features of the geomorphology and geological structure of the northern section of the Yapu trench are revealed. It is considered that the high topography of the Garolin Ridge may lead to the larger flexural stretch Zhang Liang of the subduction plate near the trench, thus forming a graben tectonic belt. The multi-channel seismic profile evidence is provided for the extensional fracture structure of the Saorol trough and the age of formation of the trough is inferred.
【作者单位】：中国科学院海洋地质与环境重点实验室中国科学院海洋研究所;青岛海洋科学与技术国家实验室海洋地质过程与环境功能实验室;青岛海洋科学与技术国家实验室海洋矿床资源评价功能实验室;中国科学院大学;
【基金】：中国科学院战略性先导科技专项(A类)资助(XDA11030102);中国科学院“海山成因、演化与深部物质循环”科技创新与交叉团队项目全球变化与海气相互作用专项(GASIGEOGE-02) 国家自然科学基金项目(41506059,41476046)
【分类号】：P737;P736.1

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