Distribution and characters of the mud diapirs and mud volcanoes off southwest Taiwan

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题名:	Distribution and characters of the mud diapirs and mud volcanoes off southwest Taiwan
作者:	許樹坤;Chen, Song-Chuen;Hsu, Shu-Kun;Wang, Yunshuen;Chung, San-Hsiung;Chen, Po-Chun;Tsai, Ching-Hui;Liu, Char-Shine;Lin, Hsiao-Shan;Lee, Yuan-Wei
贡献者:	地球科學學院地球科學學系
关键词:	Gas hydrate;Mud diapir;Mud volcano;Sidescan sonar;SW Taiwan
日期:	2014-10-01
上传时间:	2026-04-23 11:32:11 (UTC+8)
出版者:	Elsevier Ltd.;Elsevier Ltd
摘要:	摘要： •A detailed distribution of the mud diapirs and mud volcanoes off SW Taiwan is presented.•The mud volcanoes occur on tops of the diapiric structures.•The mud flows of the mud volcanoes are imaged by the radial high backscatter intensity on the sidescan sonar images. In order to identify the mud diapirs and mud volcanoes off SW Taiwan, we have examined ∼1500km long MCS profiles and related marine geophysical data. Our results show ten quasi-linear mud diapirs, oriented NNE–SSW to N–S directions. Thirteen mud volcanoes are identified from the multibeam bathymetric data. These mud volcanoes generally occur on tops of the diapiric structures. Moreover, the active mud flow tracks out of mud volcanoes MV1, MV3 and MV6 are observed through the high backscatter intensity stripes on the sidescan sonar images. The heights of the cone-shaped mud volcanoes range from 65m to 345m, and the diameters at base from 680m to 4100m. These mud volcanoes have abrupt slopes between 5.3° and 13.6°, implying the mudflow is active and highly viscous. In contrast, the flat crests of mud volcanoes are due to relative lower-viscosity flows. The larger cone-shaped mud volcanoes located at deeper water depths could be related to a longer eruption history. The formation of mud diapirs and volcanoes in the study area are ascribed to the overpressure in sedimentary layers, compressional tectonic forces and gas-bearing fluids. Especially, the gas-bearing fluid plays an important role in enhancing the intrusion after the diapirism as a large amount of gas expulsions is observed. The morphology of the upper Kaoping Slope is mainly controlled by mud diapiric intrusions. 出版者： Elsevier Ltd 出版日期： 2014-10-01 出處： Journal of Asian Earth Sciences, 2014-10, Vol.92, p.201-214 資源來源： Elsevier ScienceDirect Journals Complete 版權： 2013 Elsevier Ltd 識別號： ISSN: 1367-9120 識別號： EISSN: 1878-5786 識別號： DOI: 10.1016/j.jseaes.2013.10.009
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