东海盆地丽水-椒江凹陷前新生代岩石特征及基底新认识  

Characteristics of Pre-Cenozoic Rocks and New Findings of Basement in Lishui-Jiaojiang Sag in East China Sea Basin

作　　者：侯凯文 HOU Kaiwen

机构地区：[1]中海石油(中国)有限公司上海分公司,上海200000

出　　处：《科技创新与应用》2021年第12期1-8,共8页Technology Innovation and Application

基　　金：“十三五”国家科技重大专项(编号:2016ZX05027001)。

摘　　要：基底是沉积盆地重要的组成部分,丽水-椒江凹陷前新生界基底较为复杂,虽然经历了近三十年的研究,但对于该凹陷基底特征的认识仍存在一定的差异性。文章选取典型井的火成岩样品,通过岩石薄片分析、元素地球化学特征分析,并结合前人对区域内基底特征的研究,综合认为研究区基底发育中-酸性岩浆岩,而从构造环境来看可能为板内花岗岩或同碰撞花岗岩,其物质来源为中、上地壳,主要形成时期为三叠纪晚期-侏罗纪早期。该认识的取得,对后续开展凹陷构造演化特征研究,有着重要的指导意义。Basement is an important part of sedimentary basin.The basement of pre Cenozoic in Lishui-Jiaojiang sag is complex.Although it has been studied for nearly 30 years,there are some differences in understanding the characteristics of basement in this sag.In this paper,igneous rock samples from typical wells are selected,and thin section analysis and element geochemical characteristics analysis are carried out.It is considered that the basement of the study area is developed with intermediate acid magmatic rocks.From the perspective of tectonic environment,it may be intraplate granite or syncollisional granite,and its material source is the middle and upper crust,mainly formed in the Late Triassic-Early Jurassic.Which has important guiding significance for the study of structural evolution characteristics of the following sags.

关 键 词：丽水-椒江凹陷 元素地球化学 新生代基底 火成岩 

分 类 号：P534.6[天文地球—古生物学与地层学]