晋中冀西太原组中段火山事件层岩矿地化特征及其意义  

The Petro geochemical Characteristics and Stratigraphic Significance of the Volcanic Event Layer in Mid Taiyuan Formation from Middle Region of Shanxi and Western Region of Hebei

作　　者：贾炳文[1] 谷东起[1] 

机构地区：[1]山西矿业学院资源与环境工程系

出　　处：《沉积学报》1998年第3期85-91,共7页Acta Sedimentologica Sinica

基　　金：国家自然科学基金

摘　　要：在岩矿鉴定的基础上，对晋中冀西太原组中段普遍发育的一层火山事件层做了岩石化学、稀土元素和微量元素分析。岩石化学、ＲＥＥ配分模式、ＲＥＥ七组分图解、微量元素蛛网图极好的共性特征及微量元素幂函数定律的应用，证明该火山事件层是同源同期岛弧型钙碱性火山喷发产物，并以该火山事件层作为标志层对晋中冀西太原组地层进行了大区域对比。Results of research on the petrological,petrochemical,rare elements′ and trace elements′ characteristics of the volcanic event layers in Mid Taiyuan Formation from middle region of Shanxi and western region of Hebei are presented. Petro geochemical features,REE distributions,seven even numbered-element curves of REE and ratio spidergrams of trace elements for these pyroclastic rocks perfectly resemble, and according to the application of the theory of power function, these pyroclastic rocks considered here should belong to the isochronal products of the same resource, coming from the calc alk volcanic eruption in island arc part. The discovery of the isochronal pyroclastic rocks provide the significant information for the division and correlation of strata. In this paper, we can take these volcanic event layers as a marker bed to make regional strata correlation in this area.

关 键 词：火山事件层 太原组 地层对比 岩矿 地球化学 

分 类 号：P584[天文地球—岩石学]