日本砂岩型铀矿床成矿地质特征述评  

Reviews on the metallogenic and geologic features of sandstone-type uranium deposits in Japan

作　　者：裴承凯[1] 黄贤芳[1] 仉宝聚[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》2006年第1期27-32,共6页World Nuclear Geoscience

摘　　要：首先分析日本砂岩型铀矿床产出的区域地质背景,深入阐述“绿色凝灰岩区”和“非绿色凝灰岩区”的区域构造演化特征以及与成矿的关系。在此基础上,对日本砂岩型铀矿床铀源进行探讨,认为最有利的铀源来自基底或周边的花岗岩,其侵入时代为晚白垩世到古近纪(大约距今60～70Ma)。在矿床地质特征一节,列举日本人形咔和东浓两个重要的铀矿床矿例,对其含矿主岩特征、矿床物质成分、成矿富集因素、水文地质条件等进行研讨。最后,概括了日本以古河道(底部型)为特征的砂岩型铀矿床的找矿途径。Regional geologic settings of sandstone-type uranium deposits in Japan are firstly analyzed. The regional tectonic evolution characteristics of ＂Green tuff region＂ and ＂Non green tuff region＂ and their relationship with uranium mineralization are elaborated in depth. Based on those mentioned above, the uranium sources of sandstone-type uranium deposits in Japan are discussed deeply and the most favorable uranium sources are considered to come from the basement and the surrounding granites. Their intrusive epochs range from Later Cretaceous to Palaeogene （about 60 to 70 Ma ago）. The characteristics of ore-bearing host rocks, matter compositions of the deposits, ore formation enrichment factors, the hydrogeologic conditions and so on are described by taking Ningyo-Toge and Tono deposits as examples. Finally, the prospecting measures for the palaeo-channel sandstone-type uranium deposits （basal type） are reviewed.

关 键 词：日本 砂岩型铀矿床 成矿特征 特征述评 

分 类 号：P619.14[天文地球—矿床学]