祁连成矿带成矿特征与资源潜力分析

新祁连成矿带由原祁连成矿带及柴达木主要的钾盐产地合并而成,横跨甘肃、青海、内蒙三省区,面积达11.4×104km2。成矿带大地构造位置处于华北陆块南缘与特提斯构造带交界部位,地质演化历史复杂,岩浆活动强烈。因此,该成矿带的成矿地质条件优越,所涵盖矿种齐全,是我国重要的黑色金属、有色金属及钾盐产地。本文在前人工作的基础上,对祁连成矿带的区域地质背景、重要矿产、典型矿产成因进行了系统分析,对主攻矿种成矿特征进行了研究,划分了成矿系列,建立了成矿谱系,并对资源潜力进行了评价。设定主攻矿种为钾盐、镍、钨,划分出7个主要成矿系列。在此基础上,部署了2个重点远景区:柴达木盆地西部重点远景区;金昌一般远景区。3个一般调查区:大道尔吉一般远景区;锡铁山重点远景区;下柳沟一般远景区,为指导本区勘查工作提供了依据。

Ore forming Characteristics and Resource Potential Analysis of the Qinling Metallogenic Belt

The new Qilian metallogenic belt was merged from the old Qilian belt and the Qaidam block which hosts several salt lakes. The belt covers through three provinces or autonomous regions (including Gansu, Qinghai and Inner Mongolia) with a total area of 11.4 km2. The belt is tectonically located at the conjunction area between the south margin of north China craton and Tethys tectonic belt, which a complex history of geological evolution and intensive magmatic activities. So the belt has favorable conditions of metallogeny and is an important ore deposit belt of potash, nickel and tungsten. Based on the previous studies, this study summarized the main geological characteristics and ore forming series of the Qilian metallogenic belt, defining the key mineral species and assessing mineral resources potential. Seven metallogenic series for sylvite, nicke and tungsten have been delineated, based on which two key prospecting areas (one in western Qaidam basin and the other in Jinchang of Gansu) and three average areas (one in Dadaorji, one in Xitieshan and one in Xialiugou). This has provided guidance evidence for geological investigation of this area.