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投稿时间：2016-12-23 修订日期：2017-10-29 网络发布日期：2018-02-28
Abstract:A study of geometric and kinematic features of structures in No. 460 uranium deposit indicates that the structural framework of No. 460 uranium deposit was formed by the dextral strike-slip of the fault zone F45 and its reaction with F'45 under the action of tectonic stress from northwest to southeast. According to the attitude and distribution of ore-hosting structures in the main ore block, the authors have reached the conclusion that the NW-trending reversed s-shaped or arc-shaped tensile to tensio-shear faults in the mineralized area, which serve as branch faults of the F45 fault zone, are the decisive factors for the emplacement of uranium mineralization, and that the "fault-strata trap", constructed by steep-inclined faults and gentle-inclined strata, is another significant factor. Uranium mineralization had no direct genetic relation to Late Jurassic to Early Cretaceous volcanism, but was closely related to regional tectonic activities during the strong structural movement. The intrusion of subrhyolite-porphyry and two uranium mineralization events were all produced by regional tectonic evolution at different stages and had no necessary genetic relation because they respectively corresponded to one of the strong structural movements in this region.
keywords:geology structural framework emplacement mechanism branch structures tensile to tensio-shear faults
FANG MaoLong,XUE Wei,ZHANG YuShuang,LIU XiaoGang.2018.Emplacement mechanism of orebodies in main ore block of No. 460 uranium deposit in Guyuan, Hebei Province[J].Mineral Deposits(1):27~36