陆相高分辨率层序界面识别的地球化学方法  

Geochemical Methods of Boundary Identification in Terrigenous High-Resolution Sequence

作　　者：赵俊青[1] 纪友亮[2] 张世奇[3] 夏斌[1] 

机构地区：[1]中国科学院广州地球化学所,广州510640 [2]同济大学海洋与地球科学学院,上海200092 [3]石油大学地球资源与信息学院,山东东营257061

出　　处：《沉积学报》2004年第1期79-86,共8页Acta Sedimentologica Sinica

基　　金：国家重点基础研究发展规划项目:渤海湾盆地中生代地层剥蚀量恢复及中;新生代盆地叠合关系探讨 (G1 9990 4 330 4 )专题资助;国家十五科技攻关项目:济阳坳陷下第三系陷蔽油气藏形成机理研究 (2 0 0 1BA60 50 9)部分成果

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 ,它们对环境的变化敏感 ,同时它们的沉积分异、组合特征、矿物成分及其含量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 disttibuted in different types of sand deposits and sedimentaryrocks. They are sensitive to environmental changes. The characteristics of clay minerals such as sedimentary differentiation, composition and assemblage, contents has recorded the information of environmental change during the processes of clay mineral formation. These information will help to reconstruct paleoenvironment with huge significance in the research of water depth change.By studing lithologic geochemical parameters of high resolution sequence units in differentsequences of the third memberand the fourth upper member of Shahejie formation in Shengbei fault's downwall side of Dongying depression,it has been found in pace of cyclicity of water depth controlledby paleoclimate during the formation period of high resolution sequence units,mineral composition(clay mienral and cement) of sedimentaryrocks,chemical constituents(trace element) 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 

分 类 号：P593[天文地球—地球化学] P539.2[天文地球—地质学]