摘要
东营凹陷是一个北断南超的不对称箕状断陷湖盆,湖盆中的常量元素和微量元素含量及有关元素比值呈现出明显的旋回变化特征。而其中元素的分配及比值的变化、组合都在一定程度上指示着古沉积环境的演化历程。通过分析Fe,Mn,Ca,Sr等元素含量和Fe/Mn,Sr/Ba,Sr/Ca,Mg/Ca等元素比值以及碳氧同位素的变化特征,对东营凹陷南斜坡沙四段沉积时期的沉积环境进行了系统的研究。结果反映了沙四段沉积时期的古气候、古盐度、古湖水面和古生产力基本上都显示出了旋回变化的特征。
Dongying depression is a rift basin characterized by faulting in the north and overlaping in the south and shaped like an asymmetrical dustpan.Cyclic variations of the abundance of major elements and trace elements are obvious.The distribution of elements and variations of elements ratios and combination reveal the evolutional history of sedimentary environments in a certain extent.In this paper,the sedimentary environments of the Es_4 in the Southern Ramp of Dongying depression are studied by analyzing the elements abundance of Fe,Mn,Ca,Sr,ratios of Fe/Mn,Sr/Ba,Sr/Ca,Mg/Ca and,variations of carbon and oxygen isotopes.The results indicate paleoclimate,paleosalinity,paleolake level and paleoproductivity show cyclic variations in the period of Shasi sedimentation.
出处
《矿物岩石》
CAS
CSCD
北大核心
2005年第1期67-73,共7页
Mineralogy and Petrology
