峡东南华系南沱组底部冰川底碛沉积特征及其意义

胡军; 孙思远; 谷昊东; 安志辉; 叶琴; 王霈

doi:10.3799/dqkx.2020.179

Volume 46 Issue 7

Jul. 2021

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Article Navigation > Earth Science > 2021 > 46(7): 2515-2528

Hu Jun, Sun Siyuan, Gu Haodong, An Zhihui, Ye Qin, Wang Pei, 2021. Subglacial Sedimentary Characteristics of the Bottom of Nantuo Formation in Three Gorges Area and Its Implications. Earth Science, 46(7): 2515-2528. doi: 10.3799/dqkx.2020.179

Citation:

Hu Jun, Sun Siyuan, Gu Haodong, An Zhihui, Ye Qin, Wang Pei, 2021. Subglacial Sedimentary Characteristics of the Bottom of Nantuo Formation in Three Gorges Area and Its Implications. Earth Science, 46(7): 2515-2528. doi: 10.3799/dqkx.2020.179

Citation:

Hu Jun, Sun Siyuan, Gu Haodong, An Zhihui, Ye Qin, Wang Pei, 2021. Subglacial Sedimentary Characteristics of the Bottom of Nantuo Formation in Three Gorges Area and Its Implications. Earth Science, 46(7): 2515-2528. doi: 10.3799/dqkx.2020.179

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Subglacial Sedimentary Characteristics of the Bottom of Nantuo Formation in Three Gorges Area and Its Implications

doi: 10.3799/dqkx.2020.179

Hu Jun^{1
,
,},
Sun Siyuan¹,
Gu Haodong¹,
An Zhihui²,
Ye Qin³,
Wang Pei³

1.
State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China
2.
Wuhan Center of Geological Survey, Geological Survey of China, Wuhan 430205, China
3.
School of Earth Sciences, China University of Geosciences, Wuhan 430074, China

Received Date: 2020-06-27
Publish Date: 2021-07-15

Abstract

Abstract

Nantuo Formation directly overlies the Liantuo Formation in the Three Gorges area where the standard section for defining Sinian System is located. However, there is the absence of deposits of Sturtian glaciation and interglaciation below the Nantuo Formation. The interpretation for the depositional absence remains unclear. Our works focused on the boundary strata between the Nantuo Formation and the Liantuo Formation using sedimentological method in studying the contemporaryglacial deposits. The results show that there is a layer of purplish red diamictites between the Nantuo Formation and the Liantuo Formation in study area. The orientation, shape, roundness, lithology of the clasts and microscopic structure of diamictites in the boundary strata are obviously different from the typical Nantuo diamictites. In addition, subglacial deformational structure on microscale can be recognized at Qinlinkou section. We conclude that the inconformity between the Nantuo Formation and the Liantuo Formation is caused by subglacial erosion, and the Nantuo Formation may just record the retreat deposition of ice sheet from its glacial maximum.
- Nantuo Formation,
- Nanhua System,
- glacial deposition,
- glacial erosion,
- Three Gorges area,
- sedimentology

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References(51)

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Subglacial Sedimentary Characteristics of the Bottom of Nantuo Formation in Three Gorges Area and Its Implications

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