峡东青林口地区新元古代地层序列及沉积演变

安志辉; 童金南; 叶琴; 田力; 宋虎跃; 赵小明

doi:10.3799/dqkx.2014.075

Volume 39 Issue 7

Jul. 2014

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Article Navigation > Earth Science > 2014 > 39(7): 795-806

An Zhihui, Tong Jinnan, Ye Qin, Tian Li, Song Huyue, Zhao Xiaoming, 2014. Neoproterozoic Stratigraphic Sequence and Sedimentary Evolution at Qinglinkou Section, East Yangtze Gorges Area. Earth Science, 39(7): 795-806. doi: 10.3799/dqkx.2014.075

Citation:

An Zhihui, Tong Jinnan, Ye Qin, Tian Li, Song Huyue, Zhao Xiaoming, 2014. Neoproterozoic Stratigraphic Sequence and Sedimentary Evolution at Qinglinkou Section, East Yangtze Gorges Area. Earth Science, 39(7): 795-806. doi: 10.3799/dqkx.2014.075

Citation:

An Zhihui, Tong Jinnan, Ye Qin, Tian Li, Song Huyue, Zhao Xiaoming, 2014. Neoproterozoic Stratigraphic Sequence and Sedimentary Evolution at Qinglinkou Section, East Yangtze Gorges Area. Earth Science, 39(7): 795-806. doi: 10.3799/dqkx.2014.075

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Neoproterozoic Stratigraphic Sequence and Sedimentary Evolution at Qinglinkou Section, East Yangtze Gorges Area

doi: 10.3799/dqkx.2014.075

1.
State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China
2.
Wuhan Institute of Geology and Mineral Resources, Wuhan 430223, China

Received Date: 2013-10-01
Publish Date: 2014-07-15

Abstract

Abstract

The Yangtze Gorges area is one of the hot spots for the investigation of the Neoproterozoic in the world because of its well-preserved stratigraphic sequences recording the "Snowball Earth", "Cap Carbonate", and the "Miaohe Biota". The Qinglinkou section presented in this paper is one of the typical best-outcropped Neoproterozoic sequences in the area, providing good condition for the study of the significant biotic evolution and environmental changes during the critical time. The sequence is in lithostratigraphy composed of the Liantuo, Nantuo, Doushantuo and Dengying formations. The Liantuo Formation includes two sedimentary cycles of purple sandstones intercalated by some thin-bedded shale beds. The Nantuo Formation, uncomfortably overlying on the Liantuo Fm., is characteristic of grayish green diamictites but a member of shale with a few "drop stones" intercalated in the middle part of the formation. The Doushantuo Formation can be well subdivided into four members, among which the first one is "Cap Carbonate", the second dark dolomite interbedded with black shale, the third grey dolomite, and the last member black siliceous shale. The Dengying Formation is featured by the "two white clipping one dark unit" and they correspond with the Hamajing, Shibantan and Baimatuo members respectively. The study of the sedimentary sequence and environmental markers at the Qinglinkou section indicates that the sedimentation in the area started in the Middle Neoproterozoic time and the early sediments were terrestrial facies while the marine facies did not occur until the end of the glaciation of the "Snowball Earth" represented by the Nantuo diamictites. The Ediacaran Doushantuo and Dengying formations are either shallow-sea carbonate or districted shale facies, which became the innovation base for the origin of metazoans and the diversification of macroalgae.
- Neoproterozoic,
- stratigraphic sequence,
- sedimentary environment,
- Qinglinkou Yangtze Gorges

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Neoproterozoic Stratigraphic Sequence and Sedimentary Evolution at Qinglinkou Section, East Yangtze Gorges Area

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