摘要
以四川盆地西南部出露的中二叠世栖霞组张村剖面为例,基于岩相学基础,首先利用X射线衍射法(XRD)确定白云岩的副矿物含量,再利用电感耦合等离子体质谱法(ICP-MS)分析白云岩的稀土元素,研究白云岩储层地球化学特征和流体来源。结果表明:白云岩副矿物为石英和长石类矿物,含量均较低,范围为0~4.5%。白云岩稀土元素含量偏低,范围为1.64~3.24μg/g,呈现轻稀土亏损,重稀土富集的分馏特征。分别用后太古代以来澳大利亚平均页岩和海水标准化方式,鞍形白云岩均呈明显的铕正异常,显示热液流体的参与。
Based on REE geochemical characteristics of the dolomites in Zhangcun profile,Middle Permian Qixia Formation,SW Sichuan Basin were studied by combined application of X-ray diffraction(XRD)and inductively coupled plasma-mass spectrometry(ICP-MS).The results show that the dolomites have low non-carbonate minerals including quartzs and feldspar minerals ranging from 0 to 4.5%.The total REE content of dolomites are low,ranging from 1.64 to 3.24μg/g with the depletion of LREEs and the enrichment of HREEs.The REE patterns of saddle-shape dolomites normalized by post-Archean Australian shale and seawater,respectively,show obvious positive Eu anomaly,indicating the involvement of hydrothermal fluid.
作者
韩晓涛
白昕冉
靳慧杰
陈军典
任毅
鲍征宇
周泳君
HAN Xiaotao;BAI Xinran;JIN Huijie;CHEN Jundian;REN Yi;BAO Zhengyu;ZHOU Yongjun(Geophysical Measuring Exploration Institute of Liaoning Province,Shenyang 110032,China;Faculty of Earth Sciences,China University of Geosciences(Wuhan),Wuhan 430074,China)
出处
《世界地质》
CAS
2023年第4期611-620,共10页
World Geology
基金
国家科技重大专项(2011ZX05005-002)。
关键词
白云岩
稀土元素
铕异常
X射线衍射法
电感耦合等离子体质谱法
dolomite
REE
Eu anomaly
X-ray diffraction(XRD)
inductively coupled plasma-mass spectrometry(ICP-MS)