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台湾西南海域福尔摩沙海脊冷泉区地形地貌特征分析
王冰, 栾振东, 张鑫, 席世川, 李连福, 连超, 阎军, 陈长安
中国科学院海洋研究所
摘要:
发育于台湾西南部福尔摩沙海脊南侧脊顶的冷泉系统是南海北部陆坡区最活跃的冷泉系统之一,本文利用水深数据和ROV近海底影像资料对该冷泉区的海底地形地貌和冷泉系统的海底表征进行了描述和分析,并讨论了二者之间的响应关系。结果表明,相对于船载多波束数据而言,近海底多波束测深系统所获得数据可以较高精度的反映冷泉区海底地形地貌特征,是研究冷泉系统不可或缺的基础数据。基于ROV近海底观测影像资料,福尔摩沙海脊冷泉系统整体表现为局部被化能自养生物群落覆盖并有流体喷口零星分布的巨大自生碳酸盐岩岩丘,海底表征主要包括形态各异的自生碳酸盐岩结壳或岩体,化能自养生物群落,流体喷口,还原性沉积物等几种形式,与本区域的海底地形地貌特征具有良好的响应关系。
关键词:  冷泉  福尔摩沙脊  海底地形地貌  海底表征
DOI:10.11759/hykx20171120003
分类号:P737.2
基金项目:WPOS海洋先导专项
TOPOGRAPHIC AND GEOMORPHOLOGICAL FEATURES OF THE FORMOSA RIDGE COLD SEEP SYSTEM, SOUTHWESTERN TAIWAN
wangbing, Luan Zhendong, Zhang Xin, Xi Shi-chuan, Li Lian-fu, Lian Chao, Yan Jun, Chen Chang-an
The Institute of Oceanology, Chinese Academy of Sciences
Abstract:
The south summit of the Formosa Ridge, located at the Southwestern Taiwan, is one of the most active cold seep sites observed around the passive South China Sea continental margin. Based on the bathymetric data obtained by both R/V-and ROV-mounted multibeam echo sounder systems and the video and image data recorded by ROV, the topographic and geomorphological features of the cold seep site and the seabed surficial expressions of the cold seep system were described and analyzed. It has been shown that, compared with that of the cold seep site collected by R/V mounted multi-beam system, bathymetric data acquired with near seabed ROV-mounted multibeam system has higher accuracy and resolution, and that both macro-and micro morphological features of the survey site can be displayed on the relief map created with it. According to the video and image data collected by ROV, the Formosa Ridge cold system is characterized by the huge authigenic carbonate mound with flourishing chemoautotrophic communities and sporadic seep vents developed on it. The seabed surficial expression of this cold seep system mainly include authigenic carbonate structures with various morphological features, chemoautotrophic communities, sporadic seep vents, and reductive sediments, all of which correlate well with the seabed topographical and geomorphological characteristics.
Key words:  Cold seeps  Formosa Ridge  Seabed surficial expressions  Seabed topographic and geomorphological features
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