吉中磐石地区石炭纪鹿圈屯组沉积环境

通过对吉林省磐石市至明城公路西侧实测剖面的岩石组合及具元素地球化学分析,对该地区石炭纪鹿圈屯组沉积和构造环境进行研究。结果显示,该区鹿圈屯组结核样品常量元素具有高Si、Fe,低K、Na的特征。泥岩样品微量元素具有高Sr、Zr、Ba、V,低Be、Ta、Tl、Bi、U的特点。稀土元素具有轻重稀土分异显著、轻稀土相对富集、δEu负异常的特征。沉积环境主体为海相还原环境,发育三角洲相和海相沉积,构造背景为大陆岛弧环境。

Sedimentary environment of the Carboniferous Luquantun Formation in Panshi area,central Jilin Province

We studied the sedimentary and tectonic environment of the Carboniferous Luquantun Formation in the section of Panshi area of central Jilin,by means of analysis of lithology and element geochemistry of the samples.The results showed that the concretion samples are featured by high constant elements of Si,Fe and low constant elements of K,Na.The mudstone samples are characterized by trace elements with high contents of Sr,Zr,Ba and V and low contents of Be,Ta,Tl,Bi and U.Rare earth elements performance showed significant differentiation,and light rare earth elements were relatively enrich,butδEu was negative abanomaly.The main sedimentary environment was marine reducing environment with the sediments of delta facies and marine facies,and the tectonic setting was continental island arc.