西安石油大学学报（自然科学版）2017，Vol.32Issue(1)：8-13,22,7.DOI:10.3969/j.issn.1673-064X.2017.01.002
鄂尔多斯盆地延长组钾质斑脱岩地球化学特征
Geochemical . Characteristics of K-bentonite in Yanchang Formation of Ordos Basin
摘要
Abstract
There are K-bentonite interlayers in the Chang 7 oil shale of Ordos Basin. The geochemical characteristics of the K-bentonite are studied by means of outcrop and core observation,XRD analysis,XRF analysis and ICP-MS analysis. The results show that the K-bentonite mainly consists of clay minerals,and its secondary components are quartz and feldspar;the average mass fraction of SiO2 is 61%,and the average mass fraction of Al2 O3 and K2 O is 22. 24% and 3. 7% respectively,which shows that the K-bentonite experi-enced a strong alteration;Compared with North American shale,the Cr and Ni content of the K-bentonite is very low,and the content of Rb,Sr,Th and U is high;compared with chondrite,the content of Rb,Th and La is high,and the content of Nb,Sr,Y is low;the total mass fraction of rare earth elements is (147. 57~203. 13)× 10 -6 ,the distribution model of rare earth elements is the"right-leaning"type,that is,LREE are rich,HREE are poor,and there is negative anomaly of Eu;in Nb/Y-Zr/TiO2 diagram,the data dots are mainly located in the rhyolite-rhyolite dacite zone,which shows that the volcanic ash is mainly from middle-acid rocks.关键词
钾质斑脱岩/地球化学特征/长7油页岩/鄂尔多斯盆地Key words
K-bentonite/geochemical characteristics/Chang 7 oil shale/Ordos Basin分类
能源科技引用本文复制引用
高璞,高纬,姚志刚..鄂尔多斯盆地延长组钾质斑脱岩地球化学特征[J].西安石油大学学报（自然科学版）,2017,32(1):8-13,22,7.基金项目
中国地质调查局国土资源大调查项目(编号:1212011120963) （编号:1212011120963）
