PETROGRAPHIC CHARACTERISTICS OF DOLOMITE AND  FERROAN DOLOMITE IN XISHA ISLANDS

JI Zhaopeng; YAN Zhuoyu; XU Hong; TAO Meng; NA Qin

doi:10.16028/j.1009-2722.2019.112

2021 Vol. 37, No. 6

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Article navigation > Marine Geology Frontiers > 2021 > 37(6): 64-70

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JI Zhaopeng, YAN Zhuoyu, XU Hong, TAO Meng, NA Qin. PETROGRAPHIC CHARACTERISTICS OF DOLOMITE AND FERROAN DOLOMITE IN XISHA ISLANDS[J]. Marine Geology Frontiers, 2021, 37(6): 64-70. doi: 10.16028/j.1009-2722.2019.112

Citation:

JI Zhaopeng, YAN Zhuoyu, XU Hong, TAO Meng, NA Qin. PETROGRAPHIC CHARACTERISTICS OF DOLOMITE AND FERROAN DOLOMITE IN XISHA ISLANDS[J]. Marine Geology Frontiers, 2021, 37(6): 64-70. doi: 10.16028/j.1009-2722.2019.112

PETROGRAPHIC CHARACTERISTICS OF DOLOMITE AND FERROAN DOLOMITE IN XISHA ISLANDS

1.
College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China
2.
Qingdao Institute of Marine Geology, China Geological Survey, Qingdao 266071, China
3.
CNOOC EnerTech-Drilling & Production Co., Zhanjiang 524057, China
4.
Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
5.
Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China
6.
School of Geosciences, China University of Petroleum (East China), Qingdao 266580, China

More Information

Corresponding author: XU Hong, qdxhong@163.com

Received Date: 14 May 2019

Publish Date: 28 June 2021

Abstract

Abstract

Ferroan dolomite is found in well Xiyong 2 of Yongxing Island and well Xike 1 of Shidao Island in Xisha Islands. Through three methods including X-ray powder diffraction quantification, polarized light microscopy and scanning electron microscopy, distribution and petrographic characteristics of ferroan dolomite in the aboved two wells were discussed. The X-ray powder crystal diffraction analysis and comprehensive study show that eleven layers of ferroan dolomites are developed in the well Xike 1 of Shidao Island, and eight layers ferroan dolomites in the well Xiyong 2 of Yongxing Island. It was found by polarized light microscopy that the Miocene dolomite in the well Xiyong 2 of Yongxing Island is dominated by bioclastic dolomite, and the dolomite crystals are powder-fine grained; the content of ferroan dolomites is higher in some layers, and the crystal is mainly microcrystal-powder crystal dolomite. Through observing and analyzing the casting thin slices , it is found that a large amount of clastic dolomite is developed in well of Xike 1 and the crystals are mostly fine-grain crystal structure, self-formed to semi-self-shaped, and some samples are black ankerite oxide or cement. Under the scanning electron microscopy, samples from well Xike 1 in Shidao Island and well Xiyong 2 in Yongxing Island show that the dolomite crystals present rhombohedral polyhedral structures, with a high degree of dolomification.
- Shidao Island /
- Yongxing Island /
- dolomite /
- ferroan dolomite /
- petrography

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