满洲里大青山地区火山岩岩石地球化学特征及其与铀成矿关系  

Characteristics of Volcanic Rock Geochemistry and Relationship with Uranium Mineralization in the Daqingshan basin, Manchuria,Inner Mongolia

作　　者：李晓光[1] 卫三元[1] 李子颖[1] 戚大能[1] 

机构地区：[1]核工业北京地质研究院,北京100029

出　　处：《东华理工大学学报（自然科学版）》2013年第3期255-264,共10页Journal of East China University of Technology(Natural Science)

基　　金：中国核工业地质局地质勘察项目(201184)

摘　　要：大青山盆地岩区中生代火山岩碱质含量高,富SiO2和K2O,贫CaO和MgO,属于钙碱性硅饱和、过饱和型岩石类型,Al2O3含量高而且稳定,富集强不相容元素、多金属元素和亲石元素,稀土总量高,轻重稀土分馏较强。火山岩浆可能源于富集不相容元素的交代型地幔,并不同程度的遭受地壳混染而形成,源岩经历了流体交代作用。结合区域构造和前人资料,认为该区中生代火山岩是岩石圈拼合以及伸展背景下地幔部分熔融的产物。通过火山岩地球化学特征、其含铀性以及和临区产铀火山岩特征类比,可知本区具较好的火山岩型铀矿床找矿前景。The geochemical characteristics of volcanic rocks in Mesozoic Daqingshan show high SiO2, K20 and LILE, and low CaO, MgO and HFSE, which belong to the calc-alkaline series, supersaturated total REE enrich- ment. The rocks originated from mantle wedge, and attributed to the crustal contamination during the magmas. The Mesozoic volcanic rocks experienced from tensional to shear-compression background, resulting in the decom- pression melting of the pre-existent metasomatized lithosphere mantle. Based on petrochemical characteristics and uranium mineralization, the Mesozoic volcanic rocks are similar with the adjacent, which present the final progress in volcanic rock-type uranium prospecting in this area.

关 键 词：大青山火山岩 铀成矿 满洲里 

分 类 号：P598[天文地球—地球化学]