东昆仑屈库勒克东金锑矿床原生晕特征及深部找矿预测

Primary Halo Characteristics and Deep Prospecting Prediction of the Qukulekedong Gold-Antimony Deposit in East

屈库勒克东金锑矿床是东昆仑造山带西段近年来新发现的大型金锑矿床,目前浅部矿体开采殆尽,亟待开展深部找矿预测工作。本文利用原生晕地球化学找矿方法,在屈库勒克东金锑矿床12号和20号勘探线采集原生晕样品,通过聚类分析和因子分析,确定了屈库勒克东金锑矿床原生晕指示元素组合为Au、Ag、As、Sb、W。通过原生晕垂向分带序列、地球化学参数计算和原生晕异常分析,发现12号勘探线原生晕垂向分带序列与原生晕地球化学异常均呈现前缘晕与尾晕叠加的特征,地球化学参数在深部具有一定“反转”特征,近矿晕元素向深度500 m以下仍有延伸趋势;20号勘探线原生晕垂向分带序列和异常特征均呈现出明显的“反分带”特征,深部发育较强的前缘晕、近矿晕和较弱的尾晕,地球化学参数在已知矿体尾部发生了明显的“反转”,指示已知矿体向深部仍有延伸。在此基础上,建立了原生叠加晕模型,推测20号勘探线400 m以下深度很可能存在盲矿体,建议在下一步勘探工作中高度关注。

The large Qukulekedong Au-Sb deposit has been discovered in the western part of the East Kunlun Orogen in Xinjiang in recent years.Sicnce the ores in the Qukulekedong deposit are nearly exhausted,deep ore predication is urgently needed in this deposit.Based on the prospecting method of primary halos,this work conducted detailed sample collection along the prospecting lines No.12 and 20 in this deposit.The indicator elements of the Qukulekedong deposit were determined to be Au,Ag,As,Sb and W through cluster analysis and factor analysis.The vertical zoning sequence and geochemical parameters were calcualted,and the primary halo anomalies were analyzed.Results show that,along the prospecting line No.12 both the vertical zoning sequence and primary halo anomalies show superimposed front halo and rear halo elements.The geochemical parameters along the prospecting line No.12 display a certain"reversal"feature in the deep,and the near ore halo elements show a trend of extension to below 500 m depth.Along the prospecting line No.20,both the vertical zoning sequence and the primary halo anomalies show obvious"reverse zoning"characteristics.Furthermore,there are strong front halos and near ore halos superimposed with weak rear halos in the deep of the prospecting line No.20.And the geochemical parameters present a significant"reversal"at the bottom of the known ore bodies,indicative of the extension of the known orebodies to the deep.Based on this,this work established a superimposed primary halo model for this deposit.It is inferred that there are probably hidden ore bodies below the depth of 400 m along the prospecting line No.20,which should be focused on in further exploration.