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3D transient electromagnetics forward modeling with complex topography and structure: A case study of the TAG hydrothermal field, Mid-Atlantic Ridge
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Zuofu Nie1, Chunhui Tao1, 2, 3, *, Jinsong Shen4, *, Zhongmin Zhu4
Haiyang Xuebao | 2021, 43(6) : 145 - 156
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Haiyang Xuebao | 2021, 43(6): 145-156
• Article •
3D transient electromagnetics forward modeling with complex topography and structure: A case study of the TAG hydrothermal field, Mid-Atlantic Ridge
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Zuofu Nie1, Chunhui Tao1, 2, 3, *, Jinsong Shen4, *, Zhongmin Zhu4
Affiliations
  • 1School of Oceanography, Shanghai Jiao Tong University, Shanghai 200240, China
  • 2Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China
  • 3Key Laboratory of Submarine Geoscience, Ministry of Natural Resources, Hangzhou 310012, China
  • 4College of Geophysics, China University of Petroleum (Beijing), Beijing 102249, China
Published: 2021-06-25 doi: 10.12284/hyxb2021086
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It is crucial to evaluate seafloor massive sulfides (SMS) in terms of their special distribution. Transient electromagnetic method (TEM) is ideal for land mineral deposits prospecting, but the complicated seafloor topography, inner structure of sulfide deposits and measuring conditions in the hydrothermal field pose a great challenge to its application in the ocean. In order to verify the application potential of TEM in deep-sea exploration, a 3D forward modeling scheme was developed with finite element method, combining with bathymetry data and drilling results. The method was then applied to the TAG hydrothermal field, Mid-Atlantic Ridge, and the result was well fitted with acquired TEM data. By comparing the forward simulation results under different instrument positions, attitudes and altitude, we found that the coincident loop system could effectively detect the active TAG mound ore body when the altitude was less than 60 meters. Complex seafloor topography and how the instrument was being towed could significantly disturb the early time response, while the instrument attitude also made an influence on the detected signal. Therefore, it was necessary to combine the bathymetry data, instrument positioning data and attitude data in the research area to better interpret the measured TEM responses.

transient electromagnetics  /  3D forward modeling  /  TAG hydrothermal field  /  seafloor massive sulfides  /  complex topography and structure
Zuofu Nie, Chunhui Tao, Jinsong Shen, Zhongmin Zhu. 3D transient electromagnetics forward modeling with complex topography and structure: A case study of the TAG hydrothermal field, Mid-Atlantic Ridge[J]. Haiyang Xuebao, 2021 , 43 (6) : 145 -156 . DOI: 10.12284/hyxb2021086
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Article Info
doi: 10.12284/hyxb2021086
  • Receive Date：2020-07-24
  • Online Date：2026-02-26
  • Published：2021-06-25
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  • Received：2020-07-24
  • Revised：2020-12-04
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Affiliations
    1School of Oceanography, Shanghai Jiao Tong University, Shanghai 200240, China
    2Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China
    3Key Laboratory of Submarine Geoscience, Ministry of Natural Resources, Hangzhou 310012, China
    4College of Geophysics, China University of Petroleum (Beijing), Beijing 102249, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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