新疆乌恰地区中新生代盆地寻找热卤水成因的超大型铅锌矿床的地球化学证据

采用微量元素地球化学方法 ,系统研究了新疆乌恰中新生代沉积盆地的成矿地球化学背景、区域化探异常特征、成矿过程中元素的再分配特征等 ,认为“三色”岩层和富含Pb、Zn、Ag、Cu、Sr等成矿及伴生元素的基底是形成热卤水成因的大型—超大型铅锌矿床的物质前提。成矿过程中微量元素的再分配特征更进一步证实了本区存在大规模的热卤水活动。与金顶铅锌矿床对比 ,二者的基底都富含金属元素 ,矿石物质组分和成矿元素相同、水系沉积物异常的元素组合类似。这些特征是本区寻找热卤水成因的大型—超大型铅锌矿床的十分重要的地球化学证据。乌拉根铅锌矿床和新发现的铅锌矿化点 (带 )均有规模大、强度高的Pb、Zn、Sr组合异常与之对应 ,预示本区有良好的找矿前景

GEOCHEMICAL EVIDENCE FOR PROSPECTING SUPERLARGE-SIZED Pb-Zn DEPOSITS OF THERMAL BRINE ORIGIN IN THE MESO -CENOZOIC BASIN IN WUQIA DISTRICT, XINJIANG

Using geochemical methods of trace elements, metallogenic geochemical backgrounds, features of regional geochemical anomalies and trace element distributions in the ore forming process have been studied in this paper, which suggests that 'three color layers' 'white means gypsum; red, red sandstone; and black, black shale', and the basin rich in Pb, Zn, Ag, Cu and Sr are the material precondition for the formation of large and superlarge Pb Zn deposits. Trace element distributions in the ore forming process further confirmed that large scale thermal brine action has occurred in this area. In comparison with the Jinding Pn Zn deposit, they have similar features, such as metal element (Pb, Zn, Ag) enrichment in the basin, similar ore compositions and metallogenic elements, and similar element association of stream sediment anomalies, which is the most important geochemical evidence for prospecting large or superlarge Pb Zn deposits of thermal brine origin in the area. The Wulagen and newly delineated Pb Zn deposits are associated with Pb, Zn, Sr anomalies of stream sediments with high intensity and large dimension, suggesting that the area may be of great prospecting potentiality for Pb Zn deposits.