Geochemical characteristics of Wusu mud volca-noes in Xinjiang and their mud sources

FAN Hailong; PENG Chuankai; YU Xinqi; CHEN Jingyuan; LI Jiangtao; QIAO Donghai; GUO Jianming; XU Shiyang

2017 Vol. 36, No. 8

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FAN Hailong, PENG Chuankai, YU Xinqi, CHEN Jingyuan, LI Jiangtao, QIAO Donghai, GUO Jianming, XU Shiyang. Geochemical characteristics of Wusu mud volca-noes in Xinjiang and their mud sources[J]. Geological Bulletin of China, 2017, 36(8): 1428-1438.

Citation:

FAN Hailong, PENG Chuankai, YU Xinqi, CHEN Jingyuan, LI Jiangtao, QIAO Donghai, GUO Jianming, XU Shiyang. Geochemical characteristics of Wusu mud volca-noes in Xinjiang and their mud sources[J]. Geological Bulletin of China, 2017, 36(8): 1428-1438.

Geochemical characteristics of Wusu mud volca-noes in Xinjiang and their mud sources

1.
Key Laboratory of Petroleum Resources, Gansu Province/Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China
3.
School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
4.
No.7 Geological Party, BGMERD of Xinjiang, Wusu 833000, Xinjiang, China
5.
No.8 Geological Party, BGMERD of Xinjiang, Akesu 843000, Xinjiang, China

More Information

Corresponding author: YU Xinqi, yuxinqi@cugb.edu.cn

Received Date: 18 August 2016

Revised Date: 11 January 2017

Publish Date: 25 August 2017

Abstract

Abstract

The mud volcano results from magmatic eruption formed by geological fluid activity. The formation of mud volcano re-quires three conditions, i.e., mud source, mud migration channel and water supply. Geochemical data of 8 samples from Wusu mud volcanoes are characterized by enrichment of LREEs relative to HREEs. Chondrite standard abnormal δEu values are 0.760~0.805, (La/Yb)_N is 5.47, and Ce/La is 2.22. The mud is enriched in large ion stone elements (LILE) such as Ba and Rb, whereas the high field strength elements (HFSE) Nb, Ta are strongly depleted. Sr/Ba ratios (0.33~1.01) suggest a lower paleo-salinity, Ce/La (2.22), Ce_anom (-0.007), and V/(V+Ni) (0.78) ratios indicate that the source rocks were formed in a reducing environment. REE and trace el-ements analyse show that the source rocks of Wusu mud volcanoes were derived from lower Jurassic Dadaowan Formation and San-gonghe Formation, suggesting a river swamp-semi-deep lake sedimentary facies of coal-bearing strata which represent a kind of weak reducing environment. The mud volcano geochemical data and stratigraphic section of Wusu imply that the maximum depth of mud source strata is about 7~8km.
- mud volcano /
- geochemistry, Jurassic /
- shale /
- source rock strata /
- reducing environment /
- Wusu, Xinjiang /

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References

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