辽东连山关地区重熔混合岩岩石地球化学特征  

Petrological and geochemical characteristics of remelting chorismite in Lianshanguan area of east Liaoning

作　　者：吴迪[1] 庄廷新 刘晓东[1] 王策[1] 

机构地区：[1]核工业240研究所,辽宁沈阳110032

出　　处：《世界核地质科学》2013年第4期210-216,共7页World Nuclear Geoscience

摘　　要：连山关地区重熔混合岩位于太古宙钾长花岗岩和浪子山组一段石英岩之间,受韧性剪切带控制,局部地段缺失,为动态部分熔融作用形成。其主量元素以富Si、略富Al、富Na、富K和低Mg、低Ca为特点;微量元素表现出富集Be、Mo、Pb、Y、Ba、La、Cu和亏损Co、Ni、Zn、Cr、Ti、V,且与铀关系密切的共生元素有Pb、Mo、V、Be等特点;稀土元素具有明显的轻稀土富集和重稀土相对亏损等特征,具有较显著的Eu负异常。重熔混合岩的成因为韧性剪切作用中围岩的易熔组分不完全、不均匀重熔作用后冷凝再固化形成,重熔混合岩与铀矿化关系密切。Remehing chorismite in Lianshanguan area lies between the Archean Eon moyite and quartzite of Pt1l1, and mainly controlled by ductile shear zone. It was formed by dynamic partial melting, however, depletion phenomenon exists in its local area. The major element characteristics show that it contains high SiO2, Na2O and K2O slightly high A1203 and low MgO and CaO, meanwhile, the trace elements are rich in Be, Mo, Pb, Y, Ba, La, Cu and depleted in Co, Ni, Zn, Cr, Ti, V. Studies demonstrate that Pb, Mo, V, Be as the paragenetic element also closely related to uranium resources. The samples of rare-earth elements with remarkable Eu negative anomaly are rich in LREE and depleted in HREE. Remehing ehorismite is the product of condensation and solidification on fusible component of surrounding rock after incomplete and inhomogeneous anatexis ductile shearing in process. Remelting chorismite has close relationship to uranium mineralization.

关 键 词：连山关 重熔混合岩 岩石地球化学 SHRIMP测年 

分 类 号：P614.19[天文地球—矿床学] P59[天文地球—地质学]