贵州下寒武统黑色页岩稀土元素地球化学特征  

Geochemical Characteristics of REE in Black Shale of Lower Cambrian Series of Guizhou

作　　者：张杰[1] 孙传敏[1] 杨国峰[2] 谢飞[2] 

机构地区：[1]成都理工大学地球科学院,四川成都610000 [2]贵州大学矿业学院,贵州贵阳550003

出　　处：《稀土》2008年第2期72-75,共4页Chinese Rare Earths

基　　金：贵阳市科技局项目(Z064005)

摘　　要：研究了贵州开阳、织金等地碳质页岩系岩石化学特征及稀土元素特征。样品中K2O含量大于Na2O,与我国南方类型岩石K2O〉Na2O特征相一致。黑色页岩的稀土元素地球化学特征表明,贵州开阳、织金等地区下寒武统牛蹄塘组黑色岩系中稀土元素总量ΣREE为227.47×10^-6-623.18×10^-6,黑色页岩系稀土均值为532.69×10^-6,其稀土总量偏高。黑色页岩系Y含量范围在122.02×10^-6~188.40×10^-6,均值为155.26×10^-6,反映了富集钇的基本特征。黑色页岩中Dy元素发生一定程度富集。LREE/HREE比值为1.35-1.67,表明黑色页岩系稀土含量组成属于轻重稀土相对集中型。与织金磷块岩稀土组成类似,反映了稀土元素形成具有一定渊源性。稀土组成模式及稀土元素配分模式图表明是较典型的海相沉积物稀土配分模式。综合分析得出本区黑色页岩系属正常海相沉积成因。This paper studied petrochemical characteristics and REE characteristics in carbonaceous shale in Kaiyang and Zhijin of Guizhou.The content of K2O is greater than Na2O, which is the same to that in south of China.The geochemical characteristics of REE in black shale show that the total content of REE in black shale in Niutitang group of Kaiyang and Zhijin of Guizhou is 227.47 ×10^-6- 623.18 ×10^-6, average 532.69×10^-6, and the total content of LREE is much higher. The range of content of Y is from 122.02×10^-6 to 188.40 ×10^-6, average 155.26 ×10^-6, which shows the basic characteristic of enrichment of Y. The ratio of LREE to HREE is 1.35- 1.67, which shows that LREE and HREE are relatively intensive. That is similar to the composition of REE in phcsphorite of Zhijin, which indicates a certain relationship of origination. The composition mode of REE and distribution mode of REE show that this mode of distribution of REE is typical marine deposit and belongs to genesis of marine deposit.

关 键 词：黑色页岩 稀土元素 稀土配分模式 开阳-织金 

分 类 号：P619.14[天文地球—矿床学] P588.311[天文地球—地质学]