三江成矿带藏东段斑岩铜矿找矿前景预测

通过成矿地质背景、矿产地质特征、区域地球化学特征分析,对三江成矿带藏东段的斑岩铜(铜/金)矿成矿潜力进行了评价,并用多种方法估算了不同级别的远景资源量。指出:1)藏东三江成矿带地质构造背景独特,化探异常,斑岩体分布及已有矿床(点)等矿化显示良好,成矿条件优越,具有巨大的成矿远景。2)三江成矿带藏东段可划分出玉龙铜钼、刚达铜金、妥坝铜钼、类乌齐-东达山铜钼、江达铜金等五个斑岩型铜成矿远景区。3)三江成矿带藏东段,在0.2%铜边界品位可比条件下,铜远景资源量为2 200～4 200万t,钼远景资源量为45～200万t;在0.1%铜边界品位可比条件下,铜远景资源量达6 600万t;通过进一步地质工作可获铜地质资源量为2 500～10000万t。

Perspective forecast of prospecting in the eastern part of Sanjiang metallogenic belt

Based on the characteristics of mineralization geological background, resource geology and regional geochemistry, metallogenic potential of Porphyry copper (copper/gold) which locates in Sanjiang metallogenic belt of the east of Tibet was valued. Besides, several methods were employed to value the potential resources at different levels. All these discussion lead to the following conclusions: 1) considering the special geological structure , geochemical anomalies, porphyry and existing deposits (spot) distribution which shows a good state, Sanjiang ore belt in the east of Tibet has great ore resource potential. 2) The belt can be divided into five porphyry copper mineralization zones roughly: Yulong copper molybdenum zone, Gangda copper-gold zone, Tuoba copper- molybdenum zone, Leiwuqi-Dongda mountain copper molybdenum zone and Jiangda copper-gold zone. 3) Under the condition of 0.2% of copper cut-off grade, comparably, the storage resource of copper in this area ranges from 22 to 42 million tons and molybdenum from 0.45 to 2 million tons. And when the cut-off grade reduces to 0.1%, the storage resources of copper can reach up to 66 million tons. Through further geological work, about 25 million tons to100 million tons of copper can be acquired.