摘要
广西罗城二叠系茅口组灰岩及页岩夹薄煤层地层中,灰黑色泥晶灰岩呈透镜状散布于灰白色硅质岩中的现象普遍发育,地质特征与石香肠构造非常相似。主量、微量及稀土元素分析表明,该透镜状灰岩稀土总量从2.81ug/g到6.97ug/g,平均为4.89ug/g。稀土元素分配模式总体为轻稀土富集,重稀土亏损型,中等强度的Eu负异常和Ce负异常。据化学分析,透镜状灰岩与硅质岩具有相似的微量元素和稀土元素特征,两者应是同生沉积作用形成,是软沉积构造。碳酸盐沉积与典型海相沉积模式并不完全一致,有可能受到陆源泥质的影响。
This paper has a discussion on geochemical characteristics and genesis of the lenticular limestone of the Permian Maokou Formation in Luocheng,Guangxi.ΣREE of the lenticular limestone vary from2.81ppm to6.97ppm with an average of4.89ppm.The REE distribution pattern is characterized by enrichment in LREE with moderate negative Eu anomaly and negative Ce anomaly.Geochemistry of minor element and REE for the lenticular limestone is similar to that for silica rock in the Maokou Formation which indicates their formation by synsedimentary processes.
作者
陈晓青
汤静如
蓝天
任琴琴
CHEN Xiao-qing;TANG Jing-ru;LAN Tian;REN Qin-qin(Guilin University of Technology,Guangxi Guilin 541004)
出处
《四川地质学报》
2018年第4期552-556,共5页
Acta Geologica Sichuan
关键词
茅口灰岩
地球化学特征
成因
罗城
lenticular limestone
geochemical characteristic
genesis
