沉积层序界面研究中的矿物及地球化学方法  

Mineralogical and Geochemical Methods in Study of Sedimentary Sequence Boundary

作　　者：纪友亮[1] 胡光明[2] 张善文[3] 赵俊青[2] 

机构地区：[1]同济大学海洋与地球科学学院,上海200092 [2]石油大学地球资源与信息学院,山东东营257061 [3]中国石化胜利油田有限责任公司,山东东营257015

出　　处：《同济大学学报（自然科学版）》2004年第4期455-460,共6页Journal of Tongji University:Natural Science

基　　金：国家重点基础研究发展规划基金资助项目(G1999043304);国家"十五"科技攻关基金资助项目(2001BA60509)

摘　　要：粘土矿物、微量元素普遍存在于各种类型的沉积物和沉积岩中,它们对环境的变化极为敏感,同时它们的沉积分异、组合特征、矿物成分及其质量分数都从不同的角度记录了形成过程中各种环境因素的变化.这些对恢复古环境,研究陆相湖盆水深变化具有重要的指示意义.通过对东营凹陷胜北断层下降盘沙三段—沙四上亚段各层序内部高分辨率层序地层单元中岩石地球化学标型参数的研究发现,在一个高分辨率层序地层单元形成过程中,在古气候驱动下的湖平面变化旋回中,沉积岩中的矿物成分(主要指粘土矿物和胶结物)、化学成分(微量元素)等皆发生周期性变化.Clay minerals and trace elements are distributed in different types of sediments and sedimentary rocks,and they are sensitive to environmental changes.The characteristics of clay minerals such as sedimentary differentiation,composition and assemblage,contents have recorded the information of environmental change during the deposition processes of clay minerals.These information can help to reconstruct paleoenvironment and have huge significance in the research of water depth change.By studying lithologic-geochemical typomophic parameters of high-resolution sequence units in different sequences of the third member and the fourth upper member of Shahejie formation in Shengbei fault's downthrown side of Dongying depression,it has been found that in pace of cyclicity of water depth controlled by paleoclimate during the formation period of high-resolution sequence units,mineral composition(clay mineral and cement) of sedimentary rocks,and chemical constituents(trace element),etc would be cyclically changed.

关 键 词：粘土矿物 微量元素 胶结物 古盐度 高分辨率层序地层 胜北断层下降盘 东营凹陷 

分 类 号：P585.3[天文地球—岩石学]