Distribution of Gassy Sediments and Mud Volcanoes Offshore Southwestern Taiwan
Distribution of Gassy Sediments and Mud Volcanoes Offshore Southwestern Taiwan
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DOI：
10.3319/tao.2006.17.4.703(gh
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发表时间：
2006-12
影响因子：
0.8
通讯作者：
J. Chiu;Wei-hao Tseng;Char‐Shine Liu
中科院分区：
文献类型：
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作者：
J. Chiu;Wei-hao Tseng;Char‐Shine Liu
本研究介绍了最近在台湾西南部近海进行的密集海洋地球物理调查的结果。根据啁啾声纳和地震反射剖面数据已识别出泥火山和含气沉积物。已编制了含气沉积物和泥火山的分布，显示了从增生楔延伸到被动中国大陆边缘的这些特征。增生楔状省的海底泥火山可分为四个主要群：高雄近海、邻近高平海底峡谷、枋寮海底峡谷顶端附近以及永安线沿线。每个火山群由数座至10多座海底泥火山组成。它们的起源可能与沿着断层或泥底辟刺穿海底的高压流体上升引起的天然气水合物分解有关。这些含气沉积物和泥火山可能是由从泥底辟脱水沉积层逸出的流体形成的，或者是沿着断层和裂缝逸出的，其中游离气体或从水合物中解离的气体迁移到海底。
This study presents the results from recent intense marine geophysical surveys conducted offshore of southwestern Taiwan. Mud volcanoes and gassy sediments have been identified along chirp sonar and seismic reflection profile data. The distribution of gassy sediments and mud volcanoes has been compiled, showing these features extending from the accretionary wedge to the passive China continental margin. Submarine mud volcanoes could be grouped into four main clusters in the accretionary wedge province: offshore Kaohsiung, adjacent to the Kaoping Submarine Canyon, near the head of the Fangliao Submarine Canyon and along the Yung-An Lineament. Each cluster is composed of a few to more than 10 submarine mud volcanoes. Their origin could be related to gas hydrate dissociation with rising highpressure fluid along faults or mud diapir piercing the seafloor. These gassy sediments and mud volcanoes could be formed by fluids escaping from dewatering sedimentary layers of mud diapirs, or along faults and fractures where free gases or gases dissociating from hydrates migrate to the seafloor.