台湾地区弧-陆碰撞控制的海相前陆盆地

发布时间：2018-02-22 15:32

本文关键词： 盆地类型弧陆碰撞台湾前陆盆地海相沉积　出处：《地学前缘》2017年04期 　论文类型：期刊论文

【摘要】：依据现有的地震、钻井和野外地质资料,综合前人关于台湾地区板块相互作用、区域大地构造、岩浆活动、弧-陆碰撞过程、沉积盆地、层序地层等方面的研究成果,本文比较系统地论述了台湾地区弧-陆碰撞过程中的盆地特征及演化规律,认为约15 Ma以吕宋岛弧带为主的弧-陆碰撞对盆地样式和盆地演化产生了重大影响,自东向西,分别形成海沟、沟-坡盆地、弧前盆地、弧内盆地和弧后海相前陆盆地。弧后海相前陆盆地为台湾碰撞带最大的沉积体系,是前陆盆地发育的早期阶段,之前还经历了陆缘断陷盆地阶段和被动大陆边缘盆地阶段。研究区沉积物从源到汇的搬运过程中,盆地的沉积与构造之间的时间存在明显滞后。9~6 Ma期间,吕宋岛弧形成;晚上新世(3 Ma),台湾海相前陆盆地的沉积环境、沉积相、物源等才发生显著变化,沉积物源方向由被动大陆边缘盆地期的向SE倒转为向SW,盆地沉积与构造运动之间滞后时间长达3~6 Ma,远大于一般认为的0.1~1 Ma。沉积物沿年轻造山带走向搬运、基底沉降导致近物源区粗碎屑物质的沉积、整个搬运体系中沉积物的局部保存与释放等因素可能是导致时间滞后的主要原因。
[Abstract]:Based on the existing seismic, drilling and field geological data, and synthesizing previous studies on plate interaction in Taiwan, regional geotectonics, magmatic activity, arc-land collision process, sedimentary basins, sequence stratigraphy, etc. In this paper, the characteristics and evolution of the basin during the arc-continent collision in Taiwan are systematically discussed. It is considered that the arc-continent collision of about 15 Ma, dominated by the Luzon island arc belt, has a great influence on the basin style and the evolution of the basin, from east to west. Trench, gully slope basin, forearc basin, intraarc basin and back-arc marine Foreland basin are formed respectively. The back-arc marine Foreland basin is the largest sedimentary system in Taiwan collision zone and is the early stage of Foreland basin development. During the transport process of sediments from source to sink in the study area, the time between sedimentation and structure of the basin was obviously delayed during the period of 6 Ma, and Luzon Island was arcuate; The sedimentary environment, sedimentary facies and provenance of the marine Foreland basin in Taiwan changed significantly only in the late Pleistocene. The direction of sediment source changed from passive continental margin basin to SW.The lag time between sedimentary and tectonic movement in the basin was 3 ~ 6 Ma, which was much larger than that of 0.1 ~ 1 Ma. the sediment was transported along a young orogenic belt. The deposition of coarse clastic material in the near source area caused by the basement subsidence and the local preservation and release of sediment in the whole transport system may be the main reasons for the delay of time.
【作者单位】：海底科学与探测技术教育部重点实验室;中国海洋大学海洋地球科学学院;中石化胜利油田分公司勘探开发研究院西部分院;
【基金】：国家自然科学基金杰出青年基金项目(41325009) 山东省泰山学者特聘教授项目鳌山卓越科学家计划(2015ASTP-0S10)
【分类号】：P736.1

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