宜昌地区第四纪沉积物中玄武岩砾石与峨眉山山玄武岩的关系  

The relationship of the basalt gravels in the Quaternary sediments in the Yichang area to the Emeishan basalt

作　　者：李志宏[1] 向芳[1] 

机构地区：[1]成都理工大学沉积地质研究院,四川成都610059

出　　处：《内蒙古石油化工》2008年第23期80-83,共4页Inner Mongolia Petrochemical Industry

基　　金：国家自然科学基金项目(40602011)

摘　　要：本文在对宜昌地区第四纪沉积物中玄武岩砾石所作的微量元素和稀土元素分析基础上,通过与不同区域峨眉山玄武岩特征的对比,发现宜昌地区第四纪沉积物中来自扇三角洲的玄武岩砾石与峨眉山玄武岩无关,而晚于扇三角洲的阶地及河流沉积物中的玄武岩砾石与峨眉山玄武岩有相同的地球化学特征。这一结果证实了三峡贯通,三峡以西的物质能够搬运至三峡以东沉积的时间晚于宜昌地区扇三角洲的形成时代。Based on analyzing the trace element and the rare--earth element of the basalt gravels in the Quaternary sediments found in the Yichang area,this assay contrasts with Emeishan basalt of different region,discovering that the basalt gravels in the fan--delta is independent to Emeishan basalt. Instead,the sediments of basalt gravels in the terraces and fluvial deposit which is later than the fan--delta has homology in the characteristic of geochemistry with Emeishan basalt. This result authenticates that the Three Gorges cut throught and the substance of Three Gorges can convey from west to east,and deposited later than the age of the deposition of fans-delta.

关 键 词：地球化学 微量元素 稀土元素 长江三峡 

分 类 号：P618.53[天文地球—矿床学] P534.63[天文地球—地质学]