西藏岗巴-东亚地区永珠组沉积时代及沉积环境

陈泰一; 魏启荣; 周江羽; 王旭东; 曾会兰; 王健; 吉雪峰; 许欢; 赵闪; 欧波

doi:10.3799/dqkx.2018.200

Volume 43 Issue 8

Aug. 2018

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Article Navigation > Earth Science > 2018 > 43(8): 2893-2910

Chen Taiyi, Wei Qirong, Zhou Jiangyu, Wang Xudong, Zeng Huilan, Wang Jian, Ji Xuefeng, Xu Huan, Zhao Shan, Ou Bo, 2018. Sedimentary Epoch and Depositional Environment of Yunzhug Formation in Gamba-East Asia Area, Tibet. Earth Science, 43(8): 2893-2910. doi: 10.3799/dqkx.2018.200

Citation:

Chen Taiyi, Wei Qirong, Zhou Jiangyu, Wang Xudong, Zeng Huilan, Wang Jian, Ji Xuefeng, Xu Huan, Zhao Shan, Ou Bo, 2018. Sedimentary Epoch and Depositional Environment of Yunzhug Formation in Gamba-East Asia Area, Tibet. Earth Science, 43(8): 2893-2910. doi: 10.3799/dqkx.2018.200

Citation:

Chen Taiyi, Wei Qirong, Zhou Jiangyu, Wang Xudong, Zeng Huilan, Wang Jian, Ji Xuefeng, Xu Huan, Zhao Shan, Ou Bo, 2018. Sedimentary Epoch and Depositional Environment of Yunzhug Formation in Gamba-East Asia Area, Tibet. Earth Science, 43(8): 2893-2910. doi: 10.3799/dqkx.2018.200

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Sedimentary Epoch and Depositional Environment of Yunzhug Formation in Gamba-East Asia Area, Tibet

doi: 10.3799/dqkx.2018.200

1.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
Wuhan Rail Transit Engineering Co. Ltd. of Sinohydro 4th Bureau, Wuhan 430000, China

Received Date: 2018-02-01
Publish Date: 2018-08-15

Abstract

Abstract

The previous work is mainly concentrated in the Gangdise metallogenic belt in Cenozoic magmatite and mineral resources, but the study of Late Paleozoic sedimentary strata of the Gangdise belt is rarely reported.The recent 1:5 000 regional geological survey on western part of Gangdise metallogenic belt shows that there are a large number of exposed Late Paleozoic sedimentary strata of Yunzhug Formation.Taking the exposed Yunzhug Formation in Tibet area as the research object, the Yunzhug Formation sedimentary environment is analyzed through the geological survey, profile measurement, thin section identification, microfossils, particle size analysis and whole rock analysis firstly, and then the relationship with Gangdis is discussed in this study.It is found that Yunzhug Formation formed in Late Carboniferous (C₂) Bashikirian-Moscovian (Middle and Late Bashki-Moscow period), sporopollen fossils by gymnosperm pollen is predominant (80%) and fern spore in subordinate status (20%).Typical sedimentary structures such as horizontal bedding, parallel bedding, graded bedding, turbidite bedding, slump deformation structure and the Bauma sequence are developed in the Yunzhug Formation.Yunzhug Formation sedimentary rocks show high Si(SiO₂=60.94%-76.24%), Al(Al₂O₃=9.24%-13.20%), K(K₂O=2.81%-5.47%)and low Mg(MgO=1.32%-2.82%), Ca(CaO=1.19%-2.78%)and Na(Na₂O=0.2%-1.87%)compositions, with obvious high FeO content (3.31%-6.67%) and low Fe₂O₃ content (0.14%-0.65%).The ∑REE(174.24×10^-6-278.39×10^-6) is higher, and there is no Ce anomaly in the North American shale normalized REE pattern, and its Ce/Ce^* is 0.94-1.03.Trace elements showed enriched elements such as Rb, Th, K, U, Nb, Ta, Sr, P, Ti and other elements.Yunzhug Formation formed in active continental margin environment, deposited on the continental slope and deep basin, as the product of warm climate, regression deposition in salinity environment, is in response to the Paleo-Tethys deposits in the Gangdise area of activity.
- Carboniferous,
- Yunzhug Formation,
- sporopollen fossils,
- particle size analysis,
- geochemistry,
- depositional environment,
- Tibet,
- Gamba-East Asia

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References(75)

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沈阳化工大学材料科学与工程学院沈阳 110142

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Sedimentary Epoch and Depositional Environment of Yunzhug Formation in Gamba-East Asia Area, Tibet

doi: 10.3799/dqkx.2018.200

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通讯作者: 陈斌, bchen63@163.com

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