云南剑川-老君山新生代盆地铀矿化特征

Uranium Mineralization Characteristics of Cenozoic Jianchuan-Laojunshan Basin in Yunnan

剑川-老君山新生代盆地是以上三叠统石钟山组为基底,以新近系剑川组为主要盖层的继承性火山断陷盆地。剑川组为一套粗面岩、凝灰岩、火山角砾岩、集块熔岩、凝灰质砂岩、岩屑砂岩等组成的火山沉积岩系。研究发现,剑川-老君山盆地的铀矿化受区域性断裂及火山构造的复合控制。盆地内已发现有凝灰岩型、砂岩型、正长斑岩型、花岗斑岩型、粗面岩型和花岗伟晶岩型等6种类型的铀矿化,具有良好的找矿前景。

Jianchuan Laojunshan Cenozoic basin is an inheritance one which lies on the basement of Tri-assic Shizhongshan group and is covered by Neogene Jianchuan group.Jianchuan group is a set of volcanic sedimentary rocks composed by trachyte, tuff, volcanic breccia, agglomerate and lava, tuffaceous sandstone,lithic sandstone.Uranium mineralization was found in six types rocks,Tuff,sandstone,sy-enite porphyry,granite porphyry,trachyte and granitic pegmatite in the basin.Studies shew that Jian-chuan basin is with good exploration potential.Due to the combined effects of regional faults,volcanic activity and volcanic structure.