REE-rich sediments in the Central Pacific Basin and their acoustic characteristics

WANG Haifeng; ZHANG Zhen; YANG Yong; DENG Xiguang; XU Huaning; ZHU Kechao; HE Gaowen

2021 Vol. 40, No. 2-3

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WANG Haifeng, ZHANG Zhen, YANG Yong, DENG Xiguang, XU Huaning, ZHU Kechao, HE Gaowen. REE-rich sediments in the Central Pacific Basin and their acoustic characteristics[J]. Geological Bulletin of China, 2021, 40(2-3): 305-319.

Citation:

WANG Haifeng, ZHANG Zhen, YANG Yong, DENG Xiguang, XU Huaning, ZHU Kechao, HE Gaowen. REE-rich sediments in the Central Pacific Basin and their acoustic characteristics[J]. Geological Bulletin of China, 2021, 40(2-3): 305-319.

REE-rich sediments in the Central Pacific Basin and their acoustic characteristics

1.
Key Laboratory of Marine Mineral Resources, MNR/Guangzhou Marine Geological Survey, Guangzhou 510075, Guangdong, China
2.
Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou), Guangzhou 511458, Guangdong, China
3.
Qingdao Institute of Marine Geology, Qingdao 266071, Shandong, China

Received Date: 06 May 2020

Revised Date: 30 November 2020

Publish Date: 15 March 2021

Abstract

Abstract

To understand the enrichment mechanism of rare earth elements(REE) in the deep-sea sediment, and the regional stratigraphy of the Central Pacific Basin, Guangzhou Marine Geological Survey carried out shallow stratigraphic profile survey, single channel seismic profile survey and piston core sediment sampling in 2013, based on the method of geophysical exploration in combination with geological sampling.The following five stratigraphic units were identified by means of shallow stratigraphic profile survey and single channel seismic profile survey: ①0~12 m, Quaternary-Upper Oligocene pelagic clay; ②12~58 m, Middle Oligocene-Eocene(Late Cretaceous?) chert layer and limestone; ③58~127 m, Late Cretaceous nannofossil ooze, chalk; ④127~144 m, limestone with chert; e, and basalt.The results of lithology and element geochemical analysis indicate that the enrichment of REE in deep-sea sediments is mainly due to the contribution of biogenic apatite and volcanic hydrothermal components, while terrigenous components are not conducive to the enrichment of REE.The REE-rich deposits in the study area are mainly in pelagic transparent clay layers on the top, while the high impedance chert layers in the lower part since Oligocene can be considered as the bottom boundary of the REE-rich deposits.The results show that the targeted sedimentary layer can be quickly identified in the REE-rich sediment survey, under the guidance of shallow stratigraphic profile survey, which can provide technical support for the exploration of deep-sea potential REE resources.
- rare earth element-rich sediments /
- element geochemistry /
- minerals /
- acoustic characteristic /
- Central Pacific Basin

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References

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