杨传胜, 杨长清, 杨艳秋, 孙晶, 颜中辉, 王建强. 东海洋陆过渡带中—新生代构造变形及动力学机制[J]. 海洋地质与第四纪地质, 2020, 40(1): 71-84. DOI: 10.16562/j.cnki.0256-1492.2019080201
引用本文: 杨传胜, 杨长清, 杨艳秋, 孙晶, 颜中辉, 王建强. 东海洋陆过渡带中—新生代构造变形及动力学机制[J]. 海洋地质与第四纪地质, 2020, 40(1): 71-84. DOI: 10.16562/j.cnki.0256-1492.2019080201
YANG Chuansheng, YANG Changqing, YANG Yanqiu, SUN Jing, YAN Zhonghui, WANG Jianqiang. Meso−Cenozoic deformation and dynamic mechanism of the ocean−continent transitional zone in the East China Sea[J]. Marine Geology & Quaternary Geology, 2020, 40(1): 71-84. DOI: 10.16562/j.cnki.0256-1492.2019080201
Citation: YANG Chuansheng, YANG Changqing, YANG Yanqiu, SUN Jing, YAN Zhonghui, WANG Jianqiang. Meso−Cenozoic deformation and dynamic mechanism of the ocean−continent transitional zone in the East China Sea[J]. Marine Geology & Quaternary Geology, 2020, 40(1): 71-84. DOI: 10.16562/j.cnki.0256-1492.2019080201

东海洋陆过渡带中—新生代构造变形及动力学机制

Meso−Cenozoic deformation and dynamic mechanism of the ocean−continent transitional zone in the East China Sea

  • 摘要: 洋陆过渡带为大陆与大洋相互作用的重要地区,是研究大洋与大陆地球演化过程、动力学机制的关键,西太平洋及邻区是全球范围内开展洋陆过渡带研究的最理想实验室。东海陆架盆地及邻区整体位于华南陆块东部,中、新生代以来遭受了多期复杂的板块碰撞、俯冲、弧后拉张等影响,完整保留了该时期的构造变形,记录了丰富的洋陆过渡带地质信息。基于近10年来获取的陆域实测资料、海区地球物理数据,综合前人中、新生界研究成果,运用海-陆对比等方法,以东海陆架盆地南部及邻域为研究区,梳理了毗邻陆域中、新生界构造变形,识别出4大区域不整合面、划分了4大主要构造层,总结了区内6个构造岩浆期发育及5大区域断裂展布。同时,重新梳理了海域中、新生界地层格架,细化出5类构造样式与12种构造组合,分析了断裂、火成岩,其中断裂主要沿NE−NNE、NW向展布,兼有少量沿EW向发育的小规模断裂,岩浆岩多期次活动,主要为燕山期与喜山期。结合数值模拟,认为慢速拉伸模式较为符合研究区中生代构造环境,板片俯冲造成的局部含水地幔熔融可能为区内岩浆岩的主要成因,详细划分了区内构造演化与盆地类型。

     

    Abstract: Continent-ocean transition zone (COT) is a key to better understanding the geodynamic process and its mechanism between ocean and continent and has long been one of the hot issues in geoscientific research. The Southern East China Sea Shelf Basin (SECSSB), Zhejiang, Fujian and Guangdong regions, located at the eastern South China Block, have suffered from the westward subduction of the Izanagi Plate and the Pacific Plate as well as the far-field effect of the collision of the Indian Plate and the Eurasian Plate since Mesozoic, and complete records on tectonic deformation and COT interaction in this period are preserved. Based on geological and geophysical data acquired over the last 10 years, synthesizing Meso-Cenozoic research results and making land-ocean correlation, this paper studied the Meso-Cenozoic tectonic deformation and dynamic mechanism of the SECSSB and its adjacent areas. Based on the field geological survey, this paper provides a summary of the Meso-Cenozoic tectonic deformation in the land area. 4 major regional unconformities and 4 main structural layers are recognized, in addition to the 6 tectomagmatic periods and 5 large regional faults which have great influence on the Meso- Cenozoic sedimentary evolution. Meanwhile, this paper also summarized the Meso- Cenozoic stratigraphic framework and recognized 5 types of tectonic styles and 12 tectonic combinations in the SECSSB. Faults mainly trend in NE−NNE except a few small ones trending in EW. Magmatic rocks were mainly formed during the Yanshanian and Himalayan periods and display a spatially regular migration from west to east. Numerical simulation results show that slow-stretching model is consistent with the Mesozoic tectonic setting and local water-bearing mantle melting of the region since plate subduction is believed the main reason for the formation of magmatic rocks in the study area. Based on the study mentioned above, we discussed in details the Meso-Cenozoic tectonic evolution and basin type in this paper.

     

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