菲律宾海盆磁条带特征及61Ma以来的海底扩张过程重建

发布时间：2018-04-27 03:30

本文选题：磁条带 + 海底扩张模型　；参考：《海洋地质与第四纪地质》2017年01期

【摘要】：菲律宾海盆是西太平洋最大的边缘海盆地,作为地球上最壮观的"沟-弧-盆"体系的重要组成部分,其成因及构造演化可有效约束西太平洋洋陆过渡带的复杂动力学过程。海底磁异常条带是海底扩张的重要依据,其几何形态能够反映海底扩张的时间、方向及速率,为研究海盆的海底扩张过程提供重要信息。菲律宾海盆的次级海盆—西菲律宾海盆、四国海盆地磁异常表现为明显的条带状异常特征,帕里西维拉海盆内的磁条带特征虽不明显,但仍能看出南北向的分带现象。对海盆内的磁异常条带进行系统的分析、对比与解释,将菲律宾海盆划分为7个扩张阶段,构建了菲律宾海盆61 Ma以来的阶段性扩张模型。揭示了边缘海盆构造演化的一般规律及扩张过程为岛弧裂解、高速弧后扩张、慢速弧后扩张和扩张后作用4个阶段。
[Abstract]:The Philippine basin is the largest marginal basin in the western Pacific Ocean. As an important part of the most spectacular "trench-arc basin" system on the earth, its genesis and tectonic evolution can effectively constrain the complex dynamic process of the western Pacific oceanic transitional zone. The geomagnetic anomaly zone is an important basis for seabed spreading. Its geometry can reflect the time, direction and rate of seafloor spreading, which provides important information for the study of seabed spreading process. In the secondary basin of the Philippine basin and the west Philippine basin, the geomagnetic anomalies in the four countries show obvious banding anomalies. Although the magnetic stripe in the Palissilweila basin is not obvious, the zonation in the south-north direction can still be seen. The magnetic anomaly bands in the basin are systematically analyzed, compared and interpreted, and the Philippine basin is divided into seven stages of expansion, and the stage expansion model of the Philippine basin since 61 Ma has been constructed. It is revealed that the general law and process of tectonic evolution of marginal basin are island arc splitting, high speed back-arc expansion, slow back-arc expansion and post-extensional process.
【作者单位】：海洋沉积与环境地质国家海洋局重点实验室国家海洋局第一海洋研究所;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;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;海南省海洋地质调查研究院;
【基金】：国家自然科学基金项目(41176058) 国家基金委-山东省联合基金项目-海洋地质过程与环境(U1606401)
【分类号】：P736.1

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