西藏斯弄多地区岩帽地质地球化学特征：林子宗群火山岩中成矿的指示

杨宗耀; 唐菊兴; 张乐骏; 赵晓彦; 郎兴海; 张崇海

doi:10.3799/dqkx.2019.044

Volume 45 Issue 3

Mar. 2020

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Article Navigation > Earth Science > 2020 > 45(3): 789-803

Yang Zongyao, Tang Juxing, Zhang Lejun, Zhao Xiaoyan, Lang Xinghai, Zhang Chonghai, 2020. Geological and Geochemical Characteristics of Lithocaps in Sinongduo Area, Tibet: Implications for the Mineralization in Linzizong Group Volcanic Rocks. Earth Science, 45(3): 789-803. doi: 10.3799/dqkx.2019.044

Citation:

Yang Zongyao, Tang Juxing, Zhang Lejun, Zhao Xiaoyan, Lang Xinghai, Zhang Chonghai, 2020. Geological and Geochemical Characteristics of Lithocaps in Sinongduo Area, Tibet: Implications for the Mineralization in Linzizong Group Volcanic Rocks. Earth Science, 45(3): 789-803. doi: 10.3799/dqkx.2019.044

Citation:

Yang Zongyao, Tang Juxing, Zhang Lejun, Zhao Xiaoyan, Lang Xinghai, Zhang Chonghai, 2020. Geological and Geochemical Characteristics of Lithocaps in Sinongduo Area, Tibet: Implications for the Mineralization in Linzizong Group Volcanic Rocks. Earth Science, 45(3): 789-803. doi: 10.3799/dqkx.2019.044

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Geological and Geochemical Characteristics of Lithocaps in Sinongduo Area, Tibet: Implications for the Mineralization in Linzizong Group Volcanic Rocks

doi: 10.3799/dqkx.2019.044

1.
Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China
2.
MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources of Chinese Academy of Geological Sciences, Beijing 100037, China
3.
Centre for Ore Deposit and Exploration Science, University of Tasmania, Hobart 7001, Australia
4.
College of Earth Science, Chengdu University of Technology, Chengdu 610059, China

Received Date: 2019-03-02
Publish Date: 2020-03-15

Abstract

Abstract

Lithocap, as an important indicator for exploration, has not attracted widespread attention for a long time, hindering the exploration work.Three types of lithocaps related to different mineralization styles in Sinongduo area are sampled for petrology, microphysiography and whole rock geochemistry analysis in which Sinongduo red lithocaps correspond to Pb-Zn mineralization, while Woruo black lithocaps are of Au-Ag mineralization, and Maerdi white lithocaps display no obvious mineralization. Microscopic and petrological characteristics show that three types of lithocaps in the Sinongduo area have many quartz fragments which are composed of massive quartz and vuggy quartz. The whole rock geochemistry data show that Sinongduo red lithocaps contain over 90% of SiO₂, and are mostly composed of quartz. The Pb contents are 288.75×10^-6-4 769.16×10^-6, and the Zn is 34.34×10^-6-332.70×10^-6. The Maerdi white lithocaps are rich in aluminosilicate minerals and show none metallogenic elements anomaly. The contents of K₂O (0.26%-2.58%) in Woruo black lithocaps indicate that there are many potassium-rich altered minerals, and the contents of Au are 80.21×10^-9-360.74×10^-9. In conclusion, the forming processes of lithocaps can be explained as the ascending siliceous acid fluid reacting with the crystal tuff. Pb-Zn mineralization tends to result in enrichment of Be and a negative anomaly of Ce in chondrite normalized REE patterns. In contrast, Au-Ag mineralization benefits V, Rb, Mo and Cs and Ce, and there is a positive anomaly of Yb. In addition, the large amount of clay minerals in the biggest Maerdi white lithocap could be an implication for porphyry at depth.
- lithocap,
- Linzizong Group volcanic rock,
- geochemistry,
- gold deposit,
- Pb-Zn deposit

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References(65)

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