The deep structure of the Duanqiao hydrothermal field at the Southwest Indian Ridge

SUN Chaofeng; WU Zhaocai; TAO Chunhui; RUAN Aiguo; ZHANG Guoyin; GUO Zhikui; HUANG Enxian

doi:10.1007/s13131-017-0986-2

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Article Navigation > Acta Oceanologica Sinica > 2018 > 37(3): 73-79

SUN Chaofeng, WU Zhaocai, TAO Chunhui, RUAN Aiguo, ZHANG Guoyin, GUO Zhikui, HUANG Enxian. The deep structure of the Duanqiao hydrothermal field at the Southwest Indian Ridge[J]. Acta Oceanologica Sinica, 2018, 37(3): 73-79. doi: 10.1007/s13131-017-0986-2

Citation:

SUN Chaofeng, WU Zhaocai, TAO Chunhui, RUAN Aiguo, ZHANG Guoyin, GUO Zhikui, HUANG Enxian. The deep structure of the Duanqiao hydrothermal field at the Southwest Indian Ridge[J]. Acta Oceanologica Sinica, 2018, 37(3): 73-79. doi: 10.1007/s13131-017-0986-2

Citation:

SUN Chaofeng, WU Zhaocai, TAO Chunhui, RUAN Aiguo, ZHANG Guoyin, GUO Zhikui, HUANG Enxian. The deep structure of the Duanqiao hydrothermal field at the Southwest Indian Ridge[J]. Acta Oceanologica Sinica, 2018, 37(3): 73-79. doi: 10.1007/s13131-017-0986-2

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The deep structure of the Duanqiao hydrothermal field at the Southwest Indian Ridge

doi: 10.1007/s13131-017-0986-2

1.
Key Laboratory of Submarine Geosciences, State Oceanic Administration, Hangzhou 310012, China;Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
2.
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
3.
Henan Province Earthquake Administration, Zhengzhou 450016, China

Received Date: 2016-04-24
Rev Recd Date: 2017-01-01

Abstract

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).
- crustal thickness,
- Duanqiao hydrothermal field,
- gravity anomaly,
- polymetallic sulfides,
- Southwest Indian Ridge

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References(62)

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