甘肃寨上金矿床成矿潜力分析

寨上金矿床是近年来黄金部队在西秦岭地区发现的又一个特大型矿床。大地构造位置处于西秦岭中带,临潭—天水褶皱带新寺—大草滩复背斜西部,岷县—礼县成矿带的西端。矿床分为南北2个矿带,北矿带位于矿区倒转背斜的北翼,矿体呈板状—似板状,规模较大,产状较缓;南矿带位于倒转背斜的南翼靠近核部,矿体呈板状,规模相对较小,产状较陡。矿区与阳山、鹿儿坝等一系列大型—超大型矿床同处在祁连山—龙门山幔坡陡倾弧形带的顶端与EW向构造带的交会部位。区内有良好的化探、物探异常与矿脉相套合,矿脉的延长部位、尤其是西部第三系砂砾岩厚覆盖区,依有零星化探异常和明显物探异常,于160线经工程验证为矿致异常。结合秦岭矿床组合研究成果及矿区控矿标高统计情况,认为寨上金矿床具备形成超大型金矿的潜力。

The Analysis of Metallogenic Potential for Zhaishang Gold Deposit in Gansu Province

Zhaishang gold deposit is another exceptional large deposit detected by the Gold Exploration Branch of Armed Police in west Qinling area in the recent years,which is located in the middle part of west Qinling belt,and western part of Xinsi-Dacaotan anticlinorium in Lintan-Tianshui fold belt.It is located in the western end of the Minxian-Lixian metallogenetic zone.The deposit comprises two ore zones,i.e.,the northern one and the southern one.The former lies in the northern limb of the inversion anticline in the mining area,with tabular or tabularoid ore bodies,relatively large scale and flat mode of occurrence.The latter is in the southern limb of the inversion anti-cline,near the core,with tabular ore bodies,relatively small scale and steep features of occurrence.The mining area,together with the large-superlarge deposit of Yangshan and Luerba,lies in the convergence area of the top of Qil-ianshan-Longmenshan arcuate zone and the EW structure belt.The favorable geophysical and geochemical anomaly matches well with the vein in this area.There is still partial geophysical and geochemical anomaly in the extension part of the vein,even in the western area overlaid by the thick Tertiary sand breccia and it is verified that anomaly exists in the No.160 prospecting line.Based on the research achievements of deposits in Qinling area and the ele-vation statistics of the ore controlling,we believe that the Zhaishang gold deposit has a potential to be a superlarge gold deposit.