The formation ages of the Langzishan and Lieryu Formations in Lianshanguan area, Benxi, Liaoning Province, and its geological significance.

CHEN Jingsheng; JIANG Zhiquan; LI Weiwei; LI Bin; LIU Miao; YANG Fan; XING Dehe; WANG Yan; TAN Hongyan

2018 Vol. 37, No. 9

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CHEN Jingsheng, JIANG Zhiquan, LI Weiwei, LI Bin, LIU Miao, YANG Fan, XING Dehe, WANG Yan, TAN Hongyan. The formation ages of the Langzishan and Lieryu Formations in Lianshanguan area, Benxi, Liaoning Province, and its geological significance.[J]. Geological Bulletin of China, 2018, 37(9): 1693-1703.

Citation:

CHEN Jingsheng, JIANG Zhiquan, LI Weiwei, LI Bin, LIU Miao, YANG Fan, XING Dehe, WANG Yan, TAN Hongyan. The formation ages of the Langzishan and Lieryu Formations in Lianshanguan area, Benxi, Liaoning Province, and its geological significance.[J]. Geological Bulletin of China, 2018, 37(9): 1693-1703.

The formation ages of the Langzishan and Lieryu Formations in Lianshanguan area, Benxi, Liaoning Province, and its geological significance.

1.
Shenyang Center of China Geological Survey, Shenyang 110034, Liaoning, China
2.
Inner Mongolia Second Hydrogeology Engineering Geological Prospecting Institute, Ordos 017000, Inner Mongolia, China
3.
Liaoning Institute of Geology and Mineral Resources, Shenyang 110029, Liaoning, China

More Information

Corresponding author: LI Bin, 1171724956@qq.com

Received Date: 20 March 2018

Revised Date: 09 April 2018

Publish Date: 15 September 2018

Abstract

Abstract

A large area of the Paleoproterozoic Liaohe Group is exposed in Lianshanguan area, Benxi, Liaoning Province. Two layers of amphibolite and a set of felsic volcanic rocks have been identified in the Langzishanand Lieryu Formations of the Liaohe Group. The samples include two amphibolites and two rhyolites. Zircons from D020 for LA-ICP-MS U-Pb dating have black interior structure, unequal striation absorption and low Th/U ratios, indicating typical metamorphic origin. The age of 1934±45Ma represents the metamorphic age of the Langzishan Formation. Zircons from the other three samples for LA-ICP-MS U-Pb dating have oscillatory zoning and high Th/U ratios, indicating typical magmatic origin. The ages of 1952±38Ma and 2177±34Ma, 2208±12Ma represent the formation age of the Langzishan and Lieryu Formations respectively. In consideration of previous data, the authors hold that the formation age of the Liaohe Group is limited in the range of 2.20~1.95Ga, lasting about 250Ma. Field contact relations and chronological characteristics of volcanic rocks reveal that the Liaohe Group is a series of disordered and locally ordered structural strata, and there is no upper and lower relation between the rock groups. The Langzishan Formation is no longer suitable for being placed beneath the Lieryu Formation.
- Langzishan Formation /
- Lieryu Formation /
- amphibolites /
- felsic volcanic rocks /
- LA-ICP-MS zircon U-Pb age /
- Liaohe Group

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References

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