Ferroan dolomites in Miocene sediments of the Xisha Islands and their genetic model

许红; 张威威; 魏凯; 赫庆坤; 江云水; 许婷婷; 姜学钧; 闫桂京; 宋红瑛; 王江海

doi:10.1007/s00343-018-7136-3

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Ferroan dolomites in Miocene sediments of the Xisha Islands and their genetic model

Updated：2023-04-13

- Ferroan dolomites in Miocene sediments of the Xisha Islands and their genetic model
- Ferroan dolomites in Miocene sediments of the Xisha Islands and their genetic model
- 海洋湖沼学报（英文） 2018年36卷第1期页码：165-180
- Affiliations：
  
  1.Key Laboratory of Marine Hydrocarbon Resources and Environment Geology, Qingdao Institute of Marine Geology, Ministry of Land and Resources, Qingdao 266071, China
  2.Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China
  3.China University of Petroleum(East China), Qingdao 266555, China
  4.Shandong University of Science and Technology, Qingdao 266590, China
  5.Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering/South China Sea Bioresource Exploitation and Utilization Collaborative Innovation Center, School of Marine Sciences, Sun Yat-Sen University, Guangzhou 510006, China
- Author bio：
  
  XU Hong, qdxhong@163.com
  WANG Jianghai, wangjhai@mail.sysu.edu.cn
- Funds：
  
  the Major State Basic Research Development Program of China(2012CB956004);the Science and Technology Basic Resources Investigation Program of China(2017FY201407);the National Oil and Gas Major Projects of China(2011ZX05025-002);the National Natural Science Foundation of China (NSFC)(41106064)
- DOI：10.1007/s00343-018-7136-3
  中图分类号：
- 收稿：2017-05-03，
  
  录用：2017-6-21，
  
  网络首发：2017-08-28，
  
  纸质出版：2018-01
- Accepted：
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许红, 张威威, 魏凯, 等. Ferroan dolomites in Miocene sediments of the Xisha Islands and their genetic model[J]. 海洋湖沼学报（英文）, 2018,36(1):165-180.

Hong XU, Weiwei ZHANG, Kai WEI, et al. Ferroan dolomites in Miocene sediments of the Xisha Islands and their genetic model[J]. Chinese Journal of Oceanology and Limnology, 2018, 36(1): 165-180.
许红, 张威威, 魏凯, 等. Ferroan dolomites in Miocene sediments of the Xisha Islands and their genetic model[J]. 海洋湖沼学报（英文）, 2018,36(1):165-180. DOI： 10.1007/s00343-018-7136-3.

Hong XU, Weiwei ZHANG, Kai WEI, et al. Ferroan dolomites in Miocene sediments of the Xisha Islands and their genetic model[J]. Chinese Journal of Oceanology and Limnology, 2018, 36(1): 165-180. DOI： 10.1007/s00343-018-7136-3.

摘要

Abstract

Carbonate rocks are important reservoirs for global petroleum exploration. The largest oilfield in the South China Sea

Liuhua 11-1

is distributed in the massive carbonate reef area of the Zhujiang (Pearl) River Mouth Basin. Previous studies showed that one 802.17-m-long core from well Xichen-1 in the South China Sea mainly consisted of white and light gray-white organic reefs. Recently

a Miocene whole core (161.9 m long) of well Xiyong-2

near well Xichen-1

was found to contain six layers of yellowish brown

light yellowish gray

iron black

or light yellowish gray-white organic reefs. Scanning electron microscope images of these layers reveal a typical ferroan dolomite rich in Fe (up to 29%)

with the high concentrations of Mn

and Co. Systematic X-ray powder diffraction analysis yields a 1.9-6.1 match in phase ratio with ankerite

5.4-26.9 with dolomite

and zero with calcite

which indicate that the samples can be classified as ferroan dolomite. The iron and heavy metals are inferred to be originated from multiple volcanic eruptions of Gaojianshi Island in the Dongdao Atoll during the middle-late Miocene. These elements were dissolved in seawater

likely as a sol

and carried to Yongxing Island in the Xuande Atoll by sea currents and tides enhanced by prevailing winds

and deposited as a part of the sedimentation process in the study area. The ferroan dolomite has Sr content of (125-285)×10

-6

which is lower than the accepted Sr boundary value of dolomite. This finding suggests that dolomitization occurred during large-scale global glacial regression in the late Miocene. The isolated Xisha carbonate platform

exposed to air

underwent freshwater leaching and dolomitization induced by mixed water

and caused the extensive Fe-Mg exchange along the organic reef profile to form ankerite and ferroan dolomite. These results may help to understand paleoceanographic environmental changes in the South China Sea during the Miocene.

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