青海东昆仑胡鲁森铀矿点矿化特征与控矿因素

Mineralization Characteristics and Ore Controlling Factors of Hulusen Uranium Mineralization Spot in the East Kunlun of Qinghai

论述了青海东昆仑胡鲁森铀矿点矿化特征及其控矿因素。东昆仑地区胡鲁森铀矿点产出在上三叠统八宝山组火山岩段中,赋矿岩石为紫红色流纹质凝灰熔岩。岩石SiO2含量72.07%~78.20%,平均75.12%。Al2O3含量11.64%~13.00%,平均12.16%。K2O+Na2O含量5.06%~6.51%,平均5.72%。A/CNK值0.97~1.90,平均1.39。AR值3.59~3.73,平均3.66。总体显示酸度大、碱质高、铝过饱和等特征。HM1铀矿体品位一般0.052%~0.672%,平均0.362%,真厚度2.66~3.08m。热液蚀变极为发育,常见伊利石化、碳酸盐化、黄铁矿化等。铀矿物主要为沥青铀矿、钛铀矿。矿体呈似层状或透镜体产出。受层位、岩性、层间破碎带、深部断裂构造、矿化蚀变等联合控制。

The mineralization characteristics and ore-controlling factors of Hulusen uranium occurrence in east Kunlun,Qinghai province are discussed in detail.The Hulusen uranium occurrence is located in the upper Triassic Babaoshan volcanic member,the host rocks are amaranth rhyolite tuff lava.SiO 2 content in rocks ranges from 72.07%to 78.20%,with an average of 75.12%,and Al 2O 3 content in rocks ranges from 11.64%to 13.00%,with an average of 12.16%.K 2O+Na 2O content ranges from 5.06%~6.51%,with an average of 5.72%.The A/CNK value ranges from 0.97 to 1.90,with an average of 1.39,and the AR value ranges from 3.59 to 3.73,with an average of 3.66.In general,it shows the characteristics of high acidity and alkali,aluminum oversaturation.The U grade of ore body is from 0.052%to 0.672%in general and 0.362%in average,true thickness from 2.66 m to 3.08 m.The hydrothermal alteration here are very intensive,illitization,carbonation and pyritization are very common.Ore bodies appear as layered or lenticular,and controlled by horizon,lithology,interlayer fracture,deep fault structure and mineralized alteration together.