西沙石岛生物礁的矿物组成及其环境指示意义

翟世奎; 米立军; 沈星; 刘新宇; 修淳; 孙志鹏; 曹佳琪

doi:10.3799/dqkx.2015.047

Volume 40 Issue 4

Apr. 2015

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Article Navigation > Earth Science > 2015 > 40(4): 597-605

Zhai Shikui, Mi Lijun, Shen Xing, Liu Xinyu, Xiu Chun, Sun Zhipeng, Cao Jiaqi, 2015. Mineral Compositions and Their Environmental Implications in Reef of Shidao Island, Xisha. Earth Science, 40(4): 597-605. doi: 10.3799/dqkx.2015.047

Citation:

Zhai Shikui, Mi Lijun, Shen Xing, Liu Xinyu, Xiu Chun, Sun Zhipeng, Cao Jiaqi, 2015. Mineral Compositions and Their Environmental Implications in Reef of Shidao Island, Xisha. Earth Science, 40(4): 597-605. doi: 10.3799/dqkx.2015.047

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Mineral Compositions and Their Environmental Implications in Reef of Shidao Island, Xisha

doi: 10.3799/dqkx.2015.047

1.
Key Lab of Submarine Geosciences and Prospecting Techniques of Ministry of Education, Ocean University of China, Qingdao 266100, China
2.
Exploration Department, CNOOC Ltd., Beijing 100010, China
3.
Zhanjiang Branch of China National Offshore Oil Corporation (CNOOC) Limited, Zhanjiang 524057, China

Received Date: 2014-07-12
Publish Date: 2015-04-01

Abstract

Abstract

The reef carbonate rocks of well Xike-1 are analyzed for mineral compositions to explore the development process of reef and paleo-ocean environmental changes. It is found that carbonate minerals in the core of well Xike-1 are mainly composed of calcite (low-Mg and high-Mg), aragonite and dolomite. Mineral characteristics suggest that there is an important stratigraghic or environmental change interface at the core depth of 35.4 m. Five dolomite layers have been identified in the core(0-748 m)including one layer (289.3-312.3 m core depth) in the Yinggehai Formation of Pliocene, three layers (373.3-412.7 m, 424.7-450.6 m and 469.70-564.96 m respectively) in Huangliu Formation of Upper Miocene, and one layer (615.20-636.96 m) in the Meishan Formation of Middle Miocene. The biggest value of dolomite contents varies from 79.3% to 100%, indicating dolomitization difference in different dolomite layers. The development of the reef is mainly controlled by paleo-ocean environment changes and dolomitization of island reef is associated with sea-level changes controlled by paleoclimate events, such as the formation of ice sheet in Arctic in Pliocene, Messinian event in Late Miocene and expansion of ice sheet in Antarctic in Middle Miocene. The five dolomite layers should have been developed during a long-term stable environment mainly by the lagoon seepage-refluction model and possibly by mixed-water model.
- Xisha island reef,
- well Xike-1,
- mineral composition,
- dolomite layer,
- reef,
- marine geology

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References(44)

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Mineral Compositions and Their Environmental Implications in Reef of Shidao Island, Xisha

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