大青山地区中生代玄武质火山岩岩石地球化学特征  

Petrogeochemistry of Mesozoic basaltic volcanics in Daqingshan area

作　　者：李晓光[1] 李子颖[1] 卫三元[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：《世界核地质科学》2009年第4期202-211,共10页World Nuclear Geoscience

摘　　要：对满洲里地区大青山盆地中生代玄武质火山岩类地球化学特征进行讨论,结合野外观察和前人资料,对其岩浆演化、成因及成岩构造环境进行探讨,为下一步工作提供依据。分析可知,该区玄武质火山岩类岩浆源于富集不相容元素的富集地幔,后有壳源物质参与,是岩石圈伸展背景下早期流体交代岩石圈地幔发生部分熔融的产物。通过火山岩地球化学特征分析以及和邻区产铀火山岩特征类比可知,本区具备较好的火山热液型铀及多金属成矿的构造环境及火山岩浆演化系列。Through the discussion on petrogeochemistry of Later Mesozoic basaltic volcanics in Daqingshan Basin in Manzhouli area, combined with field observation and the predecessors＇study, its magma evolution, genesis and diagenetic structural environment are discussed, and some suggestion are provided for the further work. Basaltic magma in this area is believed to be derived from mantle with incompatible elements which were later participated by some crustal materials. It is a partially melting product of mantle by early metasomatized fluid under lithosphere extension. Through petrogeochemical analysis of the volcanics and the contrast to the adjacent uranium-producing volcanics, it is concluded that this region has structural environment to form magma evolution series which are more favorable for volcanic hydrothermal-type uranium and polymetallic mineralization.

关 键 词：满洲里地区大青山盆地 玄武岩 岩石地球化学特征 

分 类 号：P58[天文地球—岩石学] P619.14[天文地球—地质学]