摘要
对攀枝花青龙山昔格达组剖面进行了研究,分析了微量元素含量及其比值在剖面中的变化特征。结果表明,剖面中除Ba、Sr含量低于大陆上地壳外,其余元素含量均高于上地壳;w(Sr)/w(Cu)比值为1.81～4.50,δ(Ce)出现微弱负异常,反映整个剖面在沉积过程中,气候以温暖、湿润为主;w(Th)/w(U)比值偏高,且δ(Eu)显示中等程度负异常,反映剖面沉积环境总体偏还原性。样品中轻稀土富集,轻稀土含量与稀土总量呈显著正相关,说明地层中稀土元素特征主要受控于轻稀土的活动性,判断剖面沉积物为陆源特征。
The Qinglongshan Xigeda profile in Panzhihua was studied, and the variation of trace element content as well as their ratio was analyzed. The results show that in addition to Ba, Sr, the content of other elements are all higher than the upper crust. The ratios of w（Sr）/w（Cu） is 1.81 - 4.50, and 8 Ce appeared weak negative anomalies, which reflect in the deposition process of the whole profile, climate mainly warm and moist. The ratio of w （Th）/w （U） is high, and 8Eu is moderate negative anomaly, which reflect the profile depositional environment overall bias reducing. LREE enrichment in the sample, LREE content and REE content has a significant positive correlation. This indicates that the characteristics of REE are controlled by the activity of LREE, the profile sediment have land - based sources characteristics.
出处
《广东微量元素科学》
CAS
2012年第8期48-56,共9页
Trace Elements Science
关键词
微量元素
地球化学特征
沉积环境
昔格达组地层
攀枝花
trace elements
geochemical characteristics
depositional environment
Panzhihua dating from Xigeda
Panzhihua
