楚雄盆地晚三叠世海相沉积展布特征

根据楚雄盆地边缘露头分布与盆地内地震勘探成果来预测盆地内不同相带地层的分布。本文对楚雄盆地晚三叠世海相沉积展布进行探讨,认为该层在反射地震剖面上有明显的特征显示,可以确定它的平面展布。     

叶尼塞山变质地层中的硫化物—石英金矿床

研究了变质地层中硫化物—石英金矿化的形成条件。金矿床和矿点产于多变质作用边界条件的岩石发育区中。在导致围岩和石英脉中大量矿物共生组合形成的不大距离上,具有流体状态和变质作用温压条件明显更替的挤压带,对于金矿床的形成来说是最有利的。研究了在千枚岩和结晶片岩中石英脉带形成的机理。在造岩矿物中金的广泛发育和明显的重新分配,证明在导致矿石富集的变质作用时元素高的活动性。     

四川广安膨润土矿的地质特征及开发应用

广安县膨润土矿赋存于侏罗系中统上沙溪庙组第三段B亚段地层中。矿区地质构造简单。矿体呈似层状、透镜状、马鞍状。单个矿体规模不大,但层位稳定、分布面积广、埋藏浅,适宜地方开采和综合开发应用。矿床成因类型为内陆湖泊相大山-沉积型。矿石自然类型有致密块状膨润土矿。砂砾状膨润土矿、含(粉)砂质膨润土矿。以钙基膨润土为主,少部分为Na-Ca基膨润土。属偏切托过渡类蒙脱石,宜于制作活性白土系列产品。     

拉尔玛硅岩型金—铜—铀建造矿床的海底喷流沉积特征及找矿方向

西秦岭南亚带中的拉尔玛硅岩型金-铜-铀矿床,是一个比较典型的与海底喷流作用有关的金矿床。矿床赋存于寒武系太阳顶群中。太阳顶群地层由硅岩、板岩组成,厚度近千米。现已发现的矿体,80％以上产于硅岩中。硅质岩的地质地球化学特征表明,它是海底喷气沉积作用的产物,拉尔玛金-铜-铀建造矿床也具有海底喷流的沉积特征。     

Characteristics and Applications of Fluid Inclusions in the Eogene System of the Biyang Depression—I.A Fluid Inclusion Study

Presented in this paper are the rypes,salinities,homogenization temperatures and organic components of fluid inclusions formed at the four stages of diagenetic authigenesis in the Eogene of the Biyang Depression.The results of cooling experiments on fluid inclusions were used to determine the fluid system and composition of saline aqueous solution in each of the stages .The homogenization temperatures of saline aqueous solution inclusions and hydrocarbon organic inclu-sions have been corrected by two approaches ,and the trapping temperatures and pressures of fluid inclusions at each of the stages have been obtained.This strdy has shed light on the physicochemistry and evolution of diagenetic fluids.The diagentic fluid system is a system which was transformed from a chloride-bearing to a carbonate-bearing system along with the diagenic evolu-tion.The decrease of diagenetic temperature at Stage III of diagenetic authigenesis suggests that the depression would have experiences uplifting at that time.The fluorescent characteristics of fluid inclusions indicate the varieties of organic components in fluid inclusions both in time and in space.