江汉平原沉积物中含钛普通辉石对长江演化的示踪

杨建; 李长安; 张玉芬; 康春国; 邵磊

doi:10.3799/dqkx.2012.S1.005

Volume 37 Issue S1

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YANG Jian, LI Chang-an, ZHANG Yu-fen, KANG Chun-guo, SHAO Lei, 2012. Ti-Augite in Sediments of the Jianghan Plain as Tracing Mineral: Implication for the Evolution of the Yangtze River. Earth Science, 37(S1): 43-49. doi: 10.3799/dqkx.2012.S1.005

Citation:

YANG Jian, LI Chang-an, ZHANG Yu-fen, KANG Chun-guo, SHAO Lei, 2012. Ti-Augite in Sediments of the Jianghan Plain as Tracing Mineral: Implication for the Evolution of the Yangtze River. Earth Science, 37(S1): 43-49. doi: 10.3799/dqkx.2012.S1.005

Citation:

YANG Jian, LI Chang-an, ZHANG Yu-fen, KANG Chun-guo, SHAO Lei, 2012. Ti-Augite in Sediments of the Jianghan Plain as Tracing Mineral: Implication for the Evolution of the Yangtze River. Earth Science, 37(S1): 43-49. doi: 10.3799/dqkx.2012.S1.005

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Ti-Augite in Sediments of the Jianghan Plain as Tracing Mineral: Implication for the Evolution of the Yangtze River

doi: 10.3799/dqkx.2012.S1.005

1.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
Key Laboratory of Biogeology and Environmental Geology of Ministry of Educations, China University of Geosciences, Wuhan 430074, China
3.
Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, China

Received Date: 2011-10-27
Available Online: 2021-11-15
Publish Date: 2012-05-01

Abstract

Abstract

The Jianghan plain is the first large-scale offloading basin of the Yangtze River after the formation of the Three Gorges. Its sediment deposits should reflect that the Yangtze River used to flow through. Ti-augite, a characteristic rock of Panxi area, where the formational conditions is unique in the Yangtze River basin, can be used as a tracing mineral to analyze the formation of the Three Gorges. The analysis of the percentage content and the electron microprobe analysis of the pyroxenes in Zhoulao core fine sediments between 0.063 mm and 0.125 mm show that the content of pyroxenes increases after 104 meters and Ti-augites appear. This line of change (104 m) dated of about 1.1 Ma attest a change of sediment provenance. So we conclude that the Three Gorges was formed around the time 1.1 Ma. From that time, materials from upper Three Georges has deposited in the Jianghan basin as a result of the forming of the Yangtze River. The characteristics of the pyroxenes composing the first 45 meters dated around (0.45 Ma) and those of the current Yangtze River are alike, meaning that during that period the Yangtze River already develops to its current pattern.
- Jianghan plain,
- Quaternary,
- sediments,
- Ti-augite,
- evolution of the Yangtze River,
- geophysics

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References(43)

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Ti-Augite in Sediments of the Jianghan Plain as Tracing Mineral: Implication for the Evolution of the Yangtze River

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