四川省德昌县老碾沉积变质型矿床地质特征及成因浅析

Geological characteristics and genesis of Laonian sedimentary metamorphic deposit in Dechang County,Sichuan Province

老碾地区位于上扬子古陆块(Ⅰ-2)康滇前陆逆冲带(Ⅰ1-3)之康滇基底断隆带(Ⅰ1-3-2)中段,主要产出沉积变质型矿床。勘查区地层主要为前震旦系会理群天宝山组,矿床赋矿岩石主要为天宝山组二段下层石英片岩,矿体呈层状、似层状近平行产出,顶、底板为绿泥绢云千枚岩。

Laonian area is located in the middle part of Kangdian basement fault uplift belt(I 1-3-2)of Kangdian foreland thrust belt(I 1-3)of upper Yangtze ancient landmass(I-2),and mainly produces sedimentary metamorphic deposits.The strata in the exploration area are mainly Tianbaoshan formation of Huili Group of pre Sinian system.The ore bearing rock of the deposit is mainly quartz schist in the lower layer of the second member of Tianbaoshan formation.The ore bodies are layered,stratoid and nearly parallel,and the roof and floor are chlorite sericite phyllite.