SPATIAL DISTRIBUTION OF ANKERITE AND DOLOMITE  IN THE XISHA ISLANDS: EVIDENCE FROM GEOCHEMISTRY

SHENG Jiangyuan; FU Heping; MA Xiao; XU Hong; ZHAO Qiang; CHEN Xiangyu; LI Xushen; ZHANG Daojun; LIU Xinyu; YAN Zhuoyu

doi:10.16028/j.1009-2722.2020.198

2021 Vol. 37, No. 6

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Article navigation > Marine Geology Frontiers > 2021 > 37(6): 18-30

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SHENG Jiangyuan, FU Heping, MA Xiao, XU Hong, ZHAO Qiang, CHEN Xiangyu, LI Xushen, ZHANG Daojun, LIU Xinyu, YAN Zhuoyu. SPATIAL DISTRIBUTION OF ANKERITE AND DOLOMITE IN THE XISHA ISLANDS: EVIDENCE FROM GEOCHEMISTRY[J]. Marine Geology Frontiers, 2021, 37(6): 18-30. doi: 10.16028/j.1009-2722.2020.198

Citation:

SHENG Jiangyuan, FU Heping, MA Xiao, XU Hong, ZHAO Qiang, CHEN Xiangyu, LI Xushen, ZHANG Daojun, LIU Xinyu, YAN Zhuoyu. SPATIAL DISTRIBUTION OF ANKERITE AND DOLOMITE IN THE XISHA ISLANDS: EVIDENCE FROM GEOCHEMISTRY[J]. Marine Geology Frontiers, 2021, 37(6): 18-30. doi: 10.16028/j.1009-2722.2020.198

SPATIAL DISTRIBUTION OF ANKERITE AND DOLOMITE IN THE XISHA ISLANDS: EVIDENCE FROM GEOCHEMISTRY

1.
Yangtze University, Wuhan 430100, China
2.
First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266071, China
3.
Qingdao Institute of Marine Geology, China Geological Survey, Qingdao 266071, China
4.
China University of Petroleum (East China), Qingdao 266580, China
5.
Sanya School, Sanya 57200, China
6.
Zhangjiang Branch of CNOOC (China) Ltd., Zhangjiang 524057, China
7.
CNOOC EnerTech-Drilling and Production Co., Zhanjiang 524057, China

More Information

Corresponding author: XU Hong, qdxhong@163.com

Received Date: 04 December 2020

Publish Date: 28 June 2021

Abstract

Abstract

Dolomite and ankerite are widely distributed in the Xisha Islands. So far, seven layers of dolomite have been found in the well Xike 1. The seven layers of dolomite may be grouped into three zones, the shallow, the middle and the deep. The shallow zone is less than 600 meters in depth including the layer 1, layer 2 and layer 3 with a total thickness of 203 m; the middle zone includes the layer 4, layer 5 and layer 6 with a total thickness of 79 meters and occurs in a range of 600～1 000 m in depth; the deep zone includes the layer 7, 155 m in thickness buried underground more than 1000 meters in depth. The geochemical characteristics of major and trace elements of the seven layers of dolomite are studied in this paper, while diagenetic environment and genetic model discussed based on the newly acquired geochemical data combined with previous research results. Dolomite in the well Xike 1 was far beyond the affection of terrigenous materials, high content of SiO₂ may come from the volcanic activities surrounding the islands. It is evidenced that the dolomitization in the Xisha area happened in an oxidation diagenetic environment, but the intensity of oxidation is different in the shallow, middle and deep zones. The paleosalinity of sea water was high when the dolomites formed, and there are slight differences between the three zones. The content of strontium in the dolomite of the well Xike 1 is generally low, as it was strongly leached by fresh water in an environment of reef platform with relatively shallow water. Comparatively, the influence of atmospheric fresh water was strongest in the shallow zone, followed by those in the middle and deep zones. The diagenesis of dolomite in the Xisha Islands is influenced by many factors, such as high palaeosalinity seawater, atmospheric fresh water and water reflux infiltration.
- Xisha Islands /
- well Xike 1 /
- dolomite /
- trace elements /
- diagenetic environments /
- genesis models

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References

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