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Character of Basaltic Gravels in Quaternary Sediments in Yichang Area and Its Relationship with Formation of Yangtze Three Gorges(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2006年第02期
Page:
6-
Research Field:
Publishing date:

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Title:
Character of Basaltic Gravels in Quaternary Sediments in Yichang Area and Its Relationship with Formation of Yangtze Three Gorges
Author(s):
XIANG Fang1ZHU Li-dong1WANG Cheng-shan2YANG Wen-guang 1
1. Institute of Sedimentology, Chengdu University of Technology, Chengdu 610059, Sichuan, China; 2. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
Keywords:
basaltic gravels trace element rare-earth element E’ mei mountain basalt Yangtze Three Gorges cutting-through time Yichang area
PACS:
P534
DOI:
-
Abstract:
Via searching and finding the E’ mei Mountain basalt gravels in the Quaternary sediments in the Yichang area, the cutting-through time of the Three Gorges can be determined. On the basis of detailed research to sedimentary characteristics and sedimentary facies of the Quaternary sediments in Yichang area, the petrogra- phy, chemistry, rare-earth elements and trace elements characteristics of basaltic gravels in sediments of different sedimentary environments and different ages show that the E’mei Mountain basalts from areas to the west of the Three Gorges do not exist in the fan-delta and lacustrine sediments of the Yunchi and Shanxiyao Formations be- fore 0.7 Ma, but do exist in the fluvial terraces after 0.7 Ma and in the present riverbed sediments. This result proves that there was no the Yangtze River cut through the Three Gorges before 0.7 Ma.

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Last Update: 2006-06-20