|本期目录/Table of Contents|

[1]向芳,朱利东,王成善,等.宜昌地区第四纪沉积物中玄武岩砾石 特征及其与长江三峡贯通的关系[J].地球科学与环境学报,2006,28(02):6.
 XIANG Fang,ZHU Li-dong,WANG Cheng-shan,et al.Character of Basaltic Gravels in Quaternary Sediments in Yichang Area and Its Relationship with Formation of Yangtze Three Gorges[J].Journal of Earth Sciences and Environment,2006,28(02):6.
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宜昌地区第四纪沉积物中玄武岩砾石 特征及其与长江三峡贯通的关系(PDF)
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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:
第28卷
期数:
2006年第02期
页码:
6
栏目:
出版日期:
2006-06-15

文章信息/Info

Title:
Character of Basaltic Gravels in Quaternary Sediments in Yichang Area and Its Relationship with Formation of Yangtze Three Gorges
作者:
向芳1朱利东1王成善2杨文光1
1.成都理工大学沉积地质研究所,四川成都610059;2.中国地质大学地球科学与资源学院,北京100083
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
关键词:
玄武岩砾石微量元素稀土元素峨眉山玄武岩长江三峡贯通时间宜昌地区
Keywords:
basaltic gravels trace element rare-earth element E’ mei mountain basalt Yangtze Three Gorges cutting-through time Yichang area
分类号:
P534
DOI:
-
文献标志码:
A
摘要:
通过对宜昌地区第四纪沉积物中峨眉山玄武岩砾石的寻找和研究,可以确定三峡以西物质搬运至宜昌 地区的时间,从而为长江三峡贯通时间的确定提供参考。在详细研究宜昌地区第四纪沉积物的沉积特征和沉积 相基础上,分析不同沉积环境、不同时代沉积物中玄武岩质砾石的岩石学、稀土及微量元素特征,从而发现0.7 Ma以前云池组和善溪窑组的扇三角洲及湖相沉积物中,不存在来自三峡西侧的峨眉山玄武岩,而在0.7Ma以 后的阶地沉积及现代河床中却可以找到该玄武岩砾石。结果表明,在0.7Ma以前不存在贯通三峡的长江。
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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备注/Memo

备注/Memo:
[收稿日期]2005-07-05
[基金项目]教育部重大项目(重大0213);国土资源部专项基金项目(200101020403);同济大学教育部海洋地质重点实验室开放基金项目
[作者简介]向芳(1974-),女,重庆万县人,讲师,博士,从事沉积学与第四纪地质地貌学教学和研究。
更新日期/Last Update: 2006-06-20