| 西南印度洋脊“断桥”热液区深部地质构造研究 |
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| 引用本文： | 孙朝峰,吴招才,陶春辉,阮爱国,张国堙,郭志馗,黄恩贤.西南印度洋脊“断桥”热液区深部地质构造研究[J].海洋学报(英文版),2018,37(3):73-79. |
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| 作者姓名： | 孙朝峰 吴招才 陶春辉 阮爱国 张国堙 郭志馗 黄恩贤 |
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| 作者单位： | 国家海洋局海底科学重点实验室, 杭州, 310012;国家海洋局第二海洋研究所, 杭州, 310012,国家海洋局海底科学重点实验室, 杭州, 310012;国家海洋局第二海洋研究所, 杭州, 310012,国家海洋局海底科学重点实验室, 杭州, 310012;国家海洋局第二海洋研究所, 杭州, 310012,国家海洋局海底科学重点实验室, 杭州, 310012;国家海洋局第二海洋研究所, 杭州, 310012,国家海洋局海底科学重点实验室, 杭州, 310012;国家海洋局第二海洋研究所, 杭州, 310012,国家海洋局海底科学重点实验室, 杭州, 310012;国家海洋局第二海洋研究所, 杭州, 310012;中国地质大学(武汉)地球物理与空间信息学院, 武汉, 430074,河南省地震局, 郑州, 450016 |
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| 基金项目： | The National Basic Research Program (973 Program) of China under contract No. 2012CB417305; the China Ocean Mineral Resources Research and Development Association Twelfth Five-Year Major Program under contract Nos DY125-11-R-01 and DY125-11-R-05; the International Cooperative Study on Hydrothermal System at Ultraslow Spreading SWIR; the Natural Science Foundation of Zhejiang Province of China under contract No. LY12D06006; the Scientific Research Fund of Second Institute of Oceanography, State Oceanic Administration under contract No. JG1203. |
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| 摘 要： | Polymetalic sulfide is the main product of sea-floor hydrothermal venting, and has become an important sea-floor mineral resources for its rich in many kinds of precious metal elements. Since 2007, a number of investigations have been carried out by the China Ocean Mineral Resources Research and Development Association(COMRA)cruises(CCCs) along the Southwest Indian Ridge(SWIR). In 2011, the COMRA signed an exploration contract of sea-floor polymetallic sulfides of 10 000 km2 on the SWIR with the International Seabed Authority. Based on the multibeam data and shipborne gravity data obtained in 2010 by the R/V Dayang Yihao during the leg 6 of CCCs21, together with the global satellite surveys, the characteristics of gravity anomalies are analyzed in the Duanqiao hydrothermal field(37°39′S, 50°24′E). The "subarea calibration" terrain-correcting method is employed to calculate the Bouguer gravity anomaly, and the ocean bottom seismometer(OBS) profile is used to constrain the two-dimensional gravity anomaly simulation. The absent Moho in a previous seismic model is also calculated.The results show that the crustal thickness varies between 3 and 10 km along the profile, and the maximum crustal thickness reaches up to 10 km in the Duanqiao hydrothermal field with an average of 7.5 km. It is by far the most thicker crust discovered along the SWIR. The calculated crust thickness at the Longqi hydrothermal field is approximately 3 km, 1 km less than that indicated by seismic models, possibly due to the outcome of an oceanic core complex(OCC).
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| 关 键 词： | 地壳厚度 断桥热液区 重力异常 多金属硫化物 西南印度洋脊 |
| 收稿时间： | 2016/4/24 0:00:00 |
| 修稿时间： | 2017/1/1 0:00:00 |
The deep structure of the Duanqiao hydrothermal field at the Southwest Indian Ridge |
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| SUN Chaofeng,WU Zhaocai,TAO Chunhui,RUAN Aiguo,ZHANG Guoyin,GUO Zhikui and HUANG Enxian.The deep structure of the Duanqiao hydrothermal field at the Southwest Indian Ridge[J].Acta Oceanologica Sinica,2018,37(3):73-79. |
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| Authors: | SUN Chaofeng WU Zhaocai TAO Chunhui RUAN Aiguo ZHANG Guoyin GUO Zhikui and HUANG Enxian |
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| Institution: | Key Laboratory of Submarine Geosciences, State Oceanic Administration, Hangzhou 310012, China;Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China,Key Laboratory of Submarine Geosciences, State Oceanic Administration, Hangzhou 310012, China;Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China,Key Laboratory of Submarine Geosciences, State Oceanic Administration, Hangzhou 310012, China;Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China,Key Laboratory of Submarine Geosciences, State Oceanic Administration, Hangzhou 310012, China;Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China,Key Laboratory of Submarine Geosciences, State Oceanic Administration, Hangzhou 310012, China;Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China,Key Laboratory of Submarine Geosciences, State Oceanic Administration, Hangzhou 310012, China;Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;Institute of Geophysics and Geomatics, China University of Oceanography, Wuhan 430074, China and Henan Province Earthquake Administration, Zhengzhou 450016, China |
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| Abstract: | Polymetalic sulfide is the main product of sea-floor hydrothermal venting, and has become an important sea-floor mineral resources for its rich in many kinds of precious metal elements. Since 2007, a number of investigations have been carried out by the China Ocean Mineral Resources Research and Development Association (COMRA ) cruises (CCCs) along the Southwest Indian Ridge (SWIR). In 2011, the COMRA signed an exploration contract of sea-floor polymetallic sulfides of 10 000 km2 on the SWIR with the International Seabed Authority. Based on the multibeam data and shipborne gravity data obtained in 2010 by the R/V Dayang Yihao during the leg 6 of CCCs 21, together with the global satellite surveys, the characteristics of gravity anomalies are analyzed in the Duanqiao hydrothermal field (37°39′S, 50°24′E). The “subarea calibration” terrain-correcting method is employed to calculate the Bouguer gravity anomaly, and the ocean bottom seismometer (OBS) profile is used to constrain the two-dimensional gravity anomaly simulation. The absent Moho in a previous seismic model is also calculated. The results show that the crustal thickness varies between 3 and 10 km along the profile, and the maximum crustal thickness reaches up to 10 km in the Duanqiao hydrothermal field with an average of 7.5 km. It is by far the most thicker crust discovered along the SWIR. The calculated crust thickness at the Longqi hydrothermal field is approximately 3 km, 1 km less than that indicated by seismic models, possibly due to the outcome of an oceanic core complex (OCC). |
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| Keywords: | crustal thickness Duanqiao hydrothermal field gravity anomaly polymetallic sulfides Southwest Indian Ridge |
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