| 花东海盆综合地震探测及其重要的构造意义 |
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| 引用本文： | 赵明辉,王强,杨富东,张佳政,高红芳,孙龙涛,刘思青,张光学.花东海盆综合地震探测及其重要的构造意义[J].地球科学,2021,46(1):359-368. |
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| 作者姓名： | 赵明辉 王强 杨富东 张佳政 高红芳 孙龙涛 刘思青 张光学 |
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| 作者单位： | 中国科学院南海海洋研究所南海生态环境工程创新研究院边缘海与大洋地质重点实验室,广东广州 511458;南方海洋科学与工程广东省实验室,广东广州 511458;中国科学院大学地球与行星科学学院,北京 100049;中国科学院南海海洋研究所南海生态环境工程创新研究院边缘海与大洋地质重点实验室,广东广州 511458;中国科学院大学地球与行星科学学院,北京 100049;中国科学院南海海洋研究所南海生态环境工程创新研究院边缘海与大洋地质重点实验室,广东广州 511458;南方海洋科学与工程广东省实验室,广东广州 511458;中国地质调查局广州海洋地质调查局,广东广州 510075 |
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| 基金项目： | 国家自然科学基金项目;广东省基金团队项目;国家自然科学基金委员会共享航次 |
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| 摘 要： | 花东海盆位于欧亚板块与菲律宾海板块交汇处，是现今西太平洋俯冲体系中唯一遗留的早白垩纪洋盆，是研究西太平洋俯冲构造演化与动力学机制的一个关键区域.前期研究发现，关于花东海盆的基础科学问题迫切需要解决:花东海盆的性质、年龄及形成演化历史如何?南北走向的加瓜海脊是花东海盆的东部边界吗?其隆升机制和构造属性如何?花东海盆的西部边界是马尼拉俯冲带吗?其各构造单元流体作用及其与花东海盆的构造关系如何?为了解决上述科学问题，在花东海盆开展主动源与被动源的综合地球物理探测和地质采样是非常必要的.一方面，可以采用纵/横波联合反演方法获取花东海盆及其东/西边界的深达地幔的精细速度结构，为构建西太平洋俯冲构造体系跨圈层的构造演化模式提供重要的地质地球物理证据，另一方面，为中国未来在花东海盆大洋钻探计划提供重要的基础数据.
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| 关 键 词： | 花东海盆 深地震探测 加瓜海脊 马尼拉俯冲带 构造演化模式 地球物理 |
| 收稿时间： | 2020-03-20 |
Seismic Survey in Huatung Basin and Its Tectonic Significance |
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| Zhao Minghui,Wang Qiang,Yang Fudong,Zhang Jiazheng,Gao Hongfang,Sun Longtao,Liu Siqing,Zhang Guangxue.Seismic Survey in Huatung Basin and Its Tectonic Significance[J].Earth Science-Journal of China University of Geosciences,2021,46(1):359-368. |
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| Authors: | Zhao Minghui Wang Qiang Yang Fudong Zhang Jiazheng Gao Hongfang Sun Longtao Liu Siqing Zhang Guangxue |
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| Institution: | (Key Laboratory of Ocean and Marginal Sea Geology,South China Sea Institute of Oceanology,Innovation Academy of South China Sea Ecology and Environmental Engineering,Chinese Academy of Sciences,Guangzhou 511458,China;Southern Marine Science and Engineering Guangdong Laboratory,Guangzhou,511458,China;Guangzhou Marine Geological Survey,China Geological Survey,Guangzhou 510075,China;College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China) |
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| Abstract: | In the western Pacific,the Huatung basin (HB) might be a unique Early-Cretaceous oceanic basin located at the junction between the Philippine Sea plate (PSP) and Eurasia plate (EU). The HB is the key region to understand the geodynamic evolution of the western Pacific as a whole. It is a natural laboratory to investigate the interaction between the Earth's hydrosphere and lithosphere of a subduction system. Some essential scientific questions are essential toneed to be addressed based on the previous research.What is the nature and age of the crust in the HB? What is its history of formation and evolution? What is the uplift mechanism andtectonic nature of the NS-oriented Gagua ridge? For the Manila subduction zone,acting as the western boundary of the HB,what is the water content in the sediments and in the upper and lower crust of the subducting slab determined by the detailed seismic velocity structure? What is the mechanism of water emplacement? An active- and passive-source seismic experiment is necessary to be carried out also including sample dredges in near future. The crustal and mantle velocity structure beneath the HB could be acquired by the use of joint inversion of P- and S-waves. These research will not only provide geophysical constraints to understand the interaction of the Earth's hydrosphere and lithosphere of a subduction system,but will also contribute to the understanding of the tectonic framework of the western Pacific. More importantly,it is a pre-requisite before getting drilling ground truth in the HB. |
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| Keywords: | Huatung basin deep seismic survey Gagua Ridge Manila subduction zone tectonic evolution mechanism geophysics |
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