论文部分内容阅读
杜布鲁矿点是一个中前寒武纪流纹质熔接凝灰岩中的层控铀矿化点。熔接凝灰岩及其底部角砾岩不整合地位于时代为1790百万年的强烈风化的花岗岩之上,而又被厚的红色砂砾岩等河流沉积物所覆盖。红色砂砾岩之上为一套酸性到中性的陆相火山岩。熔接凝灰岩层厚度约60米,长度约4—5公里。最高的铀含量(平均为200—300ppm)产于熔接凝灰岩的含有石泡的地段内,构成几个厚1—25米,长约1000米的含矿层。铀大部分存在岩石的基质中,经受了层间的淋滤和再分布。铀有在深部和岩石界面处富集的趋势。富铀部位可能受上覆的砾岩控制。砾岩起一个物理化学圈闭的作用。下降的运移的溶液具有氧化的性质。铀在有利的条件下,以细粒状沥青铀矿和复杂的含铀钛酸盐类矿物沉淀,存在于基质的绿泥石-绢云母组分中。铀的富集一般来说与铅、钒和钼相关,但实际上,相关性是弱的。最后,扼要叙述了使用的勘探方法。
Dubulu Mine is a Meso-Precambrian rhyolite fusion tuff in the stratabound uranium mineralization point. The fused tuff and its bottom breccia are unconformably overly weathered granite of 1790 million years old and are covered by river sediments such as thick red sand and gravel. Above the red sand and conglomerate is an acidic to neutral continental volcanic rock. Tufa layer thickness of about 60 meters, length of about 4-5 km. The highest uranium content (200-300 ppm on average) is produced in the bubble-bearing sections of the fused tuff, forming several ore-bearing formations 1-25 m thick and about 1000 m in length. Most of the uranium is present in the matrix of the rock and is subjected to leaching and redistribution between the layers. Uranium has a tendency to enrich at deep and rock interfaces. The uranium-rich site may be controlled by overlying conglomerates. Conglomerates play a role in physical and chemical traps. The descending migrating solution has oxidative properties. Under favorable conditions, uranium precipitates as finely divided bituminous uranium ore and complex uranium-containing titanate minerals and is present in the chlorite-sericite component of the matrix. Uranium enrichment is generally associated with lead, vanadium and molybdenum, but in fact the correlation is weak. Finally, a brief description of the exploration methods used.