滇西新生代盆山耦合与砂岩型铀矿找矿方向  

Cenozoic coupled basin-mountain and prospecting direction for sandstone-type uranium deposits in western Yunnan

作　　者：孙泽轩[1] 陈洪德[1] 朱西养 吴英 杨永恩 

机构地区：[1]成都理工大学,四川成都610059 [2]核工业280研究所,四川广汉618300

出　　处：《铀矿地质》2007年第5期289-297,共9页Uranium Geology

摘　　要：滇西新生代盆地初始成盆时间约为14Ma,与腾冲微板块东缘泸水-瑞丽弧形右旋走滑断裂带和西缘那邦右旋走滑断裂带晚期活动时间相耦合。新生代盆地演化可分为沉积成盆与改造盆地2个阶段,前者与走滑造山带走滑活动相耦合,形成走滑盆地;后者与盆地整体隆升剥蚀密切相关,形成残留盆地。滇西地区存在2种类型的新生代盆地,其盆地沉积演化、火山活动、地貌景观等不同,砂岩型铀矿成矿条件亦存在差异。寻找砂岩型铀矿最有利处是北部腾冲地区改造盆地阶段盆地持续隆升、存在大规模火山活动、深切割低山-丘陵-河谷阶地地貌的新生代盆地。The initial forming time of Cenozoic basins in western Yunnan is at 14 Ma or so, it was coupling in the later period tectonic activity time of Lushui-Ruili arc dextral strike-slip fault belt in the east- ern fringe and Nabang dextral strike-slip fault belt in the western fringe of Tengchong microplate. The evolution of Cenozoic basins is divided into two stages of sedimentary basin and reformed basin, the former was coupling in the strike-slip tectonic activity of orogen, and formed strike-slip basins, the latter was closely related with the uplift of the whole basins, and formed residual basins. It is considered that there exists two sorts of Cenozoic basins, and they are different in sedimentary evolution, volcanic activ- ity and geographic sight etc. , the metallogenic conditions of sandstone-type uranium deposits are also different. The most favourable basins for prospecting sandstone-type uranium deposits are those basins that keeps on uplifting in reformed basin stages, exists volcanic activity and deep incised low mountainhill-river valley terraces in northern Tengchong area.

关 键 词：新生代盆地 盆山耦合 砂岩型铀矿 滇西 

分 类 号：P612[天文地球—矿床学]