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Mineral chemistry of clinopyroxene in pyroclastic rocks of the Xisha Islands and their geological significance
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Shiying Li1, 2, Kefu Yu1, 3, 4, 5, *, Yu Zhang3, 4, 5, Shichen Tao1, Hongqiang Yan1
Haiyang Xuebao | 2019, 41(7) : 65 - 76
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Haiyang Xuebao | 2019, 41(7): 65-76
• Marine Geology •
Mineral chemistry of clinopyroxene in pyroclastic rocks of the Xisha Islands and their geological significance
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Shiying Li1, 2, Kefu Yu1, 3, 4, 5, *, Yu Zhang3, 4, 5, Shichen Tao1, Hongqiang Yan1
Affiliations
  • 1 Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
  • 2 University of Chinese Academy of Science, Beijing 100049, China
  • 3 Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, Guangxi University, Nanning 530004, China
  • 4 Coral Reef Research Center of China, Guangxi University, Nanning 530004, China
  • 5 School of Marine Sciences, Guangxi University, Nanning 530004, China
Published: 2019-07-25 doi: 10.3969/j.issn.0253-4193.2019.07.006
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The composition of clinopyroxene in pyroclastic rocks at the bottom of the Xisha Islands was determined in detail by electron microprobe analysis. The results show that the clinopyroxenes are mostly rich in calcium and have a zonal structure. Ca, Fe and Ti concentrations increased from the core to the outer layers, reflecting the normal sequence of magmatic crystallization. The chemical characteristics of the pyroxene, including low Si, high Al (SiO2=41.40%–48.44%, Al2O3=5.54%–10.20%) and even higher AlIV concentrations, coincide with those of basic magma. The main element data of the clinopyroxene show that the concentration of monoclinic Ca is high. The Ca/(Ca+Mg+Fe) ratio is between 46.1% and 51.4%. The large amount of high-calcium clinopyroxene may be attributed to the high concentration of Ca in magma. Combining this with the earthquake and tectonic data of the Xisha sea area, we speculate that the basement of the coral reefs of Chenhang Island is a flat-topped seamount composed of basaltic volcanic clastic rocks. Further, we infer that its formation involved the passing of magma through the lithospheric layer of the fault and its eruption in the seabed of the Xisha Islands. The volcanic clastic material is thus formed by accumulation and consolidation, and the original rock of the volcanic clastic rock is an intraplate alkaline basalt.

Xisha Islands  /  pyroclastic rock  /  clinopyroxene  /  mineral chemistry  /  coral reef basement
Shiying Li, Kefu Yu, Yu Zhang, Shichen Tao, Hongqiang Yan. Mineral chemistry of clinopyroxene in pyroclastic rocks of the Xisha Islands and their geological significance[J]. Haiyang Xuebao, 2019 , 41 (7) : 65 -76 . DOI: 10.3969/j.issn.0253-4193.2019.07.006
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Year 2019 volume 41 Issue 7
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Article Info
doi: 10.3969/j.issn.0253-4193.2019.07.006
  • Receive Date：2018-03-08
  • Online Date：2026-04-02
  • Published：2019-07-25
Article Data
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History
  • Received：2018-03-08
  • Revised：2019-01-01
Funding
Affiliations
    1 Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
    2 University of Chinese Academy of Science, Beijing 100049, China
    3 Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, Guangxi University, Nanning 530004, China
    4 Coral Reef Research Center of China, Guangxi University, Nanning 530004, China
    5 School of Marine Sciences, Guangxi University, Nanning 530004, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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