南海东部次海盆海山链多金属结核(壳)地球化学特征及成因

周娇; 蔡鹏捷; 杨楚鹏; 李学杰; 高红芳; 蔡观强; 周建厚; 杨天邦

doi:10.3799/dqkx.2021.093

Volume 47 Issue 7

Jul. 2022

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Article Navigation > Earth Science > 2022 > 47(7): 2586-2601

Zhou Jiao, Cai Pengjie, Yang Chupeng, Li Xuejie, Gao Hongfang, Cai Guanqiang, Zhou Jianhou, Yang Tianbang, 2022. Geochemical Characteristics and Genesis of Polymetallic Nodules (Crusts) in Seamount Chain of Eastern Subbasin, South China Sea. Earth Science, 47(7): 2586-2601. doi: 10.3799/dqkx.2021.093

Citation:

Zhou Jiao, Cai Pengjie, Yang Chupeng, Li Xuejie, Gao Hongfang, Cai Guanqiang, Zhou Jianhou, Yang Tianbang, 2022. Geochemical Characteristics and Genesis of Polymetallic Nodules (Crusts) in Seamount Chain of Eastern Subbasin, South China Sea. Earth Science, 47(7): 2586-2601. doi: 10.3799/dqkx.2021.093

Citation:

Zhou Jiao, Cai Pengjie, Yang Chupeng, Li Xuejie, Gao Hongfang, Cai Guanqiang, Zhou Jianhou, Yang Tianbang, 2022. Geochemical Characteristics and Genesis of Polymetallic Nodules (Crusts) in Seamount Chain of Eastern Subbasin, South China Sea. Earth Science, 47(7): 2586-2601. doi: 10.3799/dqkx.2021.093

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Geochemical Characteristics and Genesis of Polymetallic Nodules (Crusts) in Seamount Chain of Eastern Subbasin, South China Sea

doi: 10.3799/dqkx.2021.093

Zhou Jiao^{1, 2
,
,},
Cai Pengjie¹,
Yang Chupeng^{1, 2
,
,},
Li Xuejie^{1, 2},
Gao Hongfang^{1, 2},
Cai Guanqiang^{1, 2},
Zhou Jianhou¹,
Yang Tianbang¹

1.
Key Laboratory of Marine Mineral Resources of Ministry of Natural Resources, Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou 511458, China
2.
Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China

Received Date: 2021-04-12
Publish Date: 2022-07-25

Abstract

Abstract

In order to further explain the geochemical characteristics and genesis of polymetallic nodules (crusts) in different regions of the South China Sea, X-ray diffraction, X-ray fluorescence spectroscopy, SEM-EDS analysis and X-Series analysis were carried out on the newly obtained polymetallic nodules (crusts) from the Huangyan-Zhenbei seamount chain in the eastern Subbasin. The mineral composition and geochemical characteristics of polymetallic nodules (crusts) were analyzed by ICP-MS. The results show that the mineral compositions of polymetallic nodules (crusts) are hydroxidite, quartz and plagioclase, and the main rock forming elements are Si and Al. It is rich in Mn, Fe, Co, Ti, Ni, Pb, Sr, Cu and other metal elements. Compared with other areas in the South China Sea, it has the characteristics of medium Fe and Mn contents, and the geochemical element characteristics are similar to those of ferromanganese nodules (crusts) found in the northwest slope of the South China Sea. The REE content of nodules (crusts) in the study area is high (average 2 070.01×10^-6), which is higher than other samples in the northern South China Sea, and close to the industrial grade of crusts in the West Pacific, indicating its important rare earth resource prospect. The results of Be isotope indicate that the age of Fe Mn nodules in this area is 1.17‒8.51 Ma, which was formed after a large number of volcanic eruptions in the Late Miocene. Therefore, the hydrogenesis is the main control of the seamount chain nodules (crusts) in the eastern Subbasin of the South China Sea, and the input of terrigenous materials, volcanism and leaching of high-pressure hydrogen rich seawater all provide favorable conditions for the formation of nodules (crusts).
- polymetallic nodule (crust),
- geochemical characteristics,
- REE,
- cause analysis,
- eastern subbasin,
- marine geology

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References(74)

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