Mineral chemistry characteristics of clinopyroxene and ilmenite in basite of Lan'gan area, Anhui Province

CAI Yitao; XU Mincheng; SHI Jianbin; YANG Xianzhong; ZHANG Jie; KANG Congxuan; CAO Zhengqi; DONG Zhongdou; MA Yuguang

doi:10.12097/gbc.dztb-38-1-1

Geological Bulletin of China > 2019 > 38(1): 1-13. > DOI: 10.12097/gbc.dztb-38-1-1

CAI Yitao, XU Mincheng, SHI Jianbin, YANG Xianzhong, ZHANG Jie, KANG Congxuan, CAO Zhengqi, DONG Zhongdou, MA Yuguang. 2019: Mineral chemistry characteristics of clinopyroxene and ilmenite in basite of Lan'gan area, Anhui Province. Geological Bulletin of China, 38(1): 1-13. DOI: 10.12097/gbc.dztb-38-1-1

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Mineral chemistry characteristics of clinopyroxene and ilmenite in basite of Lan'gan area, Anhui Province

1.
Nanjing Center, China Geological Survey, Nanjing 210016, Jiangsu, China
2.
No.5 Geological Party, Jiangsu Bureau of Geology and Mineral Resources, Xuzhou 221004, Jiangsu, China
3.
Hubei Institute of Geological Survey, Wuhan 430034, Hubei, China
4.
The Second Institute of Hydrology and Engineering Geological Prospecting of Anhui Geological Prospecting Bureau, Wuhu 241000, Hubei, China

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Received Date: May 19, 2018
Revised Date: June 21, 2018
Available Online: August 15, 2023

Graphical Abstract

Abstract

Abstract

Mafic rocks are exposed in northern Anhui Province. It consists of diabase, gabbro-diabase and diabase-porphyrite, and the minerals mainly include clinopyroxene, plagioclase, hornblende and Ti-Fe oxides. In this paper, clinopyroxene and ilmenite were studied in detail using microprobe. An analysis of clinopyroxenes shows that the end members are composed of wollastonite, enstatite and ferrosilite, belonging to augite. Calculation results and chemical analysis of ratios probably indicate that the fractional crystallizing products were formed by the relatively primary magma in shallower magma chambers. The crystallizing temperature of the clinopyroxenes are 1109~1206℃ and the highest pressure is 0.6 GPa, suggesting the depth of 19.8km. The ilmenite in Lan'gan area has low MgO and MnO, high FeO, and very low Cr₂O₃. The mineral characteristics of clinopyroxen and ilmenite are different from features of the index minerals in typical kimberlite.
- clinopyroxene,
- ilmenite,
- basite,
- diamond-bearing rock,
- Lan'gan area,
- northern Anhui Province

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References (30)

References

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Mineral chemistry characteristics of clinopyroxene and ilmenite in basite of Lan'gan area, Anhui Province