伟晶状或混合交代片麻状花岗岩型铀矿床成矿特征  

Metallogenic characteristics of pegmatoid or migmatization-metasomatosis gneissose granite type uranium deposits

作　　者：王木清[1] 涂江汉[1] WANG Muqing;TU Jianghan(Beijing Research Institute of Uranium Geology,Beijing 100029,China)

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》2020年第3期161-169,共9页World Nuclear Geoscience

摘　　要：通过对玄岭后、3075、陈家庄和红石泉矿床的产出成矿构造背景、含矿岩石特征、矿化特征研究,表明伟晶状或混合交代片麻状花岗岩型铀矿床的形成与地槽褶皱晚期岩浆作用有关,且多产出在靠近最先隆起的古断块或古陆块附近。铀矿化岩体主要产于中等区域变质区,区域内通常混合岩化相当发育,也形成一些花岗质混合岩或混合花岗岩等。铀矿床主要以浸染状晶质铀矿形式产出,其成矿物质来源与地层关系密切,经混合岩化—热液或重熔岩浆—热液再造等过程而形成。此类型矿床是含铀地层选择性熔融,并在此过程中导致铀的活化转移和局部富集的结果,据此指明我国花岗岩地区的找矿方向。Detailed studies on metallogenic tectonic setting,uranium mineralization characteristics and host rocks in Xuanlinghou,3075,Chenjiazhuang and Hongshiquan deposit showed that formation of pegmatic or migmatization-metasomatosis gneissic granite type uranium deposits is related to the late magmatism of geosynclinal fold,and most of them occurred near the first uplifted paleo-fault block or paleo land massif.Uranium mineralized rocks mainly occurred in the middle-level regional metamorphism area,where migmatization was well developed and some granitic migmatites or migmatites were formed.Uranium deposits are mainly in the form of disseminated uraninite,and their ore-forming materials are closely related to the strata,which are formed by the process of migmatization hydrothermal or remelting magma hydrothermal reconstruction.Formation of uranium mineralization of post fold period is considered as a result remobilization.Migration and local concentration were caused by preferential melting of the uranium-rich stara.And the prosepecting directions were pointed out for the granite region in China.

关 键 词：晶质铀矿 铀矿化 伟晶状或混合交代片麻状花岗岩型铀矿床 褶皱晚期 

分 类 号：P619.14[天文地球—矿床学]