安徽含山小茨山早石炭世高骊山组稀土元素特征及其地质学意义  

REE characteristics of Early Carboniferous Gaolishan Formation from Xiaoci Mountain in Hanshan County,Anhui Province and its geological significances

作　　者：赵欢[1] 洪天求[1] 罗雷[1] 张立夫[1] 

机构地区：[1]合肥工业大学资源与环境工程学院,安徽合肥230009

出　　处：《合肥工业大学学报（自然科学版）》2017年第9期1269-1275,共7页Journal of Hefei University of Technology：Natural Science

基　　金：安徽省国土资源科技资助项目(2011-k-16)

摘　　要：文章对安徽含山县小茨山下石炭统高骊山组10件泥岩样品的稀土元素进行了地球化学分析,结果表明:该区高骊山组泥岩的稀土元素总量较高,该区轻稀土元素相对富集,重稀土元素相对亏损;Ce_(anom)值反映出当时水介质处于还原状态;(La/Yb)_n值表明该区高骊山组上部的沉积速率普遍比下部低。根据四射珊瑚化石组合及其分布规律,将高骊山组自下而上划分出2个组合带(Arachnolasma intermedium-Yuanophyllum组合带与Lonsdaleia组合带)。通过分析高骊山组稀土元素地球化学特征和沉积环境特征与古生物群的分布关系,认为风暴作用以及沉积环境是影响化石保存和古生物群发展的主控因素。Through the geochemical analysis of rare earth elements（REE） of ten mudstone samples of Lower Carboniferous Gaolishan Formation in Xiaoci Mountain in Hanshan County, Anhui Province, it is shown that the total content of REE in mudstone of Gaolishan Formation is high. There are relative enrichment of LREE and relative loss of HREE in the studied area. Ce^n values reflect that the water medium belongs to reducing condition at that time. （La/Yb）n values show that the deposition rate in the upper part of the studied area is generally lower than that in the lower part. According to the fos- sil assemblage and distribution pattern of coral, the studied area can be divided into two groups, namely Arachnolasma intermedium-Yuanophyllum combination belt and Lonsdaleia combination belt. Through the geochemical research of REE in the Gaolishan Formation and combined with the analysis of the characteristics of the sedimentary environment and the influence of the Palaeobiota in the Gaol- ishan Formation in Xiaoci Mountain area, it is concluded that the storm action and sedimentary envi- ronment are the main control factors for the survival and development of the Palaeobiota.

关 键 词：稀土元素 沉积环境 古生物群 高骊山组 早石炭世 小茨山 

分 类 号：P618.7[天文地球—矿床学]