摘要
秦岭造山带自元古宙以来就是一个活动的地质单元,对于其演化过程的研究一直是地学中的热点问题。以淅川震旦系灯影组白云岩为研究对象,在对虎窝剖面实测及取样的基础上,分析了淅川灯影组白云岩微量、稀土元素等地球化学特征,对淅川灯影组岩石学、地球化学及其沉积环境演化特征进行研究,得出以下结论:淅川灯影组岩性主要为白云岩,沉积相类型有潮下斜坡带、潮上云坪以及潮间带;白云岩主要形成于盐度较高、温度较为炎热的低纬度海相环境中;淅川灯影组主要经历了从沉积初期的水体较深、还原环境逐渐变为末期的水体较浅、弱氧化环境并且出现暴露沉积特点,表现为整体海退的过程。本次研究对于揭示新元古代晚期秦岭地区的古环境特征及其大地构造演化史具有重要意义。
The Qinling orogen has been an active geological unit since Proterozoic,of which the study about its origin and evolution has been a hot issue in geology for a long time.In this paper,we presented the trace and rare earth geochemical data from the dolomite of Neoproterozoic,the Dengying Formation,in the Huwo section of Xichuan area.Field work shows that the Dengying Formation mainly consists of dolomite,and can be divided into three sedimentary facies,i.e.the subtidal slope zone,intertidal zone and supratidal flat.Geochemical data indicate that the dolomite in Dengying Formation was mainly formed in a marine environment of high salinity,under hot climate and low latitudes.The Dengying Formation started from deep-water and reduction environment then changed into shallow-water and weak oxidation environment and finally exposed,showing agenerally process of regression.
作者
郑德顺
刘思聪
徐江红
王振江
李雨
ZHENG Deshun;LIU Sicong;XU Jianghong;WANG Zhenjiang;LI Yu(Institute of Resource and Environment,Henan Polytechnic University,Jiaozuo 454003,China)
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
2018年第4期112-122,共11页
Marine Geology & Quaternary Geology
关键词
淅川
灯影组
白云岩
地球化学
古环境
Xichuan
Dengying Formation
dolomite
geochemistry
palaeoenvironment
