下扬子地区早古生代晚期前陆盆地沉积特征与盆山过程

杨树锋; 陈汉林; 龚根辉; 张耀; 孟立丰

doi:10.3799/dqkx.2019.973

Volume 44 Issue 5

May 2019

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Yang Shufeng, Chen Hanlin, Gong Genhui, Zhang Yao, Meng Lifeng, 2019. Sedimentary Characteristics and Basin-Orogen Processes of the Late Early Paleozoic Foreland Basins in the Lower Yangtze Region. Earth Science, 44(5): 1494-1510. doi: 10.3799/dqkx.2019.973

Citation:

Yang Shufeng, Chen Hanlin, Gong Genhui, Zhang Yao, Meng Lifeng, 2019. Sedimentary Characteristics and Basin-Orogen Processes of the Late Early Paleozoic Foreland Basins in the Lower Yangtze Region. Earth Science, 44(5): 1494-1510. doi: 10.3799/dqkx.2019.973

Citation:

Yang Shufeng, Chen Hanlin, Gong Genhui, Zhang Yao, Meng Lifeng, 2019. Sedimentary Characteristics and Basin-Orogen Processes of the Late Early Paleozoic Foreland Basins in the Lower Yangtze Region. Earth Science, 44(5): 1494-1510. doi: 10.3799/dqkx.2019.973

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Sedimentary Characteristics and Basin-Orogen Processes of the Late Early Paleozoic Foreland Basins in the Lower Yangtze Region

doi: 10.3799/dqkx.2019.973

Yang Shufeng^{1,2
,},
Chen Hanlin^{1,2
,
,},
Gong Genhui^1,2,
Zhang Yao^1,2,
Meng Lifeng^1,2

1.
School of Earth Sciences, Zhejiang University, Hangzhou 310027, China
2.
Structural Reaserch Center of Oil and Gas Bearing Basin, Ministry of Education, Hangzhou 310027, China

Received Date: 2019-04-30
Publish Date: 2019-05-15

Abstract

Abstract

The sedimentary facies in the lower Yangtze area changed from the neritic facies to the delta facies in the Late Ordovician. This change of sedimentary facies is related to the orogenic event in the late Early Paleozoic. Based on the comprehensive study of sedimentology and detrital zircon geochronology from the Late Ordovician to the Silurian in the lower Yangtze area, this paper presents the nature and spatial-temporal evolution of the sedimentary basin and discusses the relationship between the basin evolution and the orogenic uplift and denudation. The lithology changed from lithic sandstone to quartz sandstone and grain size changed from coarse to fine from southeast to northwest in the lower Yangtze area. The basin morphology shows asymmetrical wedge shape in transverse cross-section. The sediments are thicker and the slope is steeper in the southeastern part than those in the northwestern part. The narrow subsidence center of the basin parallels to the orogenic belt and migrates from southeast to northwest. All these features indicate the characteristics of foreland basin for the late Early Paleozoic sedimentary basin in the lower Yangtze area. The 900-720 Ma detrital zircons from the Upper Ordovician to the Middle Silurian indicate that the provenance of these strata is the sediments deposited in the rift basin in the Late Neoproterozoic. Occurrence and gradual increase of the 450-420 Ma detrital zircons in the Early Silurian Gaojiabian Formation indicate that the synorogenic magmatic rocks were exposed to provide materials. The absence of 1.9-1.7 Ga detrital zircons which are widespread in the Cathaysia Block might imply that the Cathaysia Block was not the sediment provenance of the late Early Paleozoic basins in the lower Yangtze area. The foreland basin in the lower Yangtze area began to develop in the Late Ordovician. The tectonic subsidence rate exceeded the rate of sediment supply, so thick neritic mudstone interbedded with siltstone and sandstone deposited in the foredeep. The sediments in the foreland basin in the Yangtze area became coarser and the sedimentary facies changed from the neritic facies to the delta front facies with the increasing uplift and northwestward propagation of the orogenic belt in the end of the Late Ordovician. In the Early Silurian, more synorogenic magmatic rocks were eroded, resulting in the increase of the 450-420 Ma detrital zircons in the foreland basin.
- lower Yangtze area,
- foreland basin,
- late Early Paleozoic,
- sedimentology,
- detrital zircon,
- basin-orogen process

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References(47)

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Sedimentary Characteristics and Basin-Orogen Processes of the Late Early Paleozoic Foreland Basins in the Lower Yangtze Region

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