新疆若羌县阿确墩地区1∶5万红土岭等四个图幅矿产地质调查工作主要进展及成果

Main progress and achievements of four 1∶50000 mineral geological survey sheets(Hongtulin Temple sheet and others)of Aquedun area of Ruoqiang County in Xinjiang Province

为查明新疆东昆仑地区早古生代铜镍矿和早中生代金矿的成矿规律和成矿背景,采用“找矿发现-规律总结-新区发现”工作技术方法,在新疆若羌县阿确墩地区开展了1∶5万红土岭等四幅矿产地质调查工作,取得的新进展及主要成果为①查明研究区内吐特卡—红土岭一带出露的基性—超基性岩体具有镁铁—超镁铁质岩的特征,是早泥盆世早期裂解环境下亏损地幔与岩石圈地幔共同作用的产物,而非原定的“蛇绿岩残片”;②首次在研究区内的金水口岩群白沙河岩组中新发现退变质榴闪岩,呈透镜状产出于片麻岩中,获得的两组变质年龄与东昆仑已报道的榴辉岩、榴闪岩等高压变质岩石的高压变质年龄(450~430 Ma)和退变质作用时代(420~405 Ma)相接近,暗示了东昆仑早古生代存在规模巨大(大于1000 km)的高压变质岩带,对探讨东昆仑造山带早古生代构造演化具有重要意义;③通过1∶5万化探综合异常查证,新发现金、铜镍等6处矿(化)点,其中以玉古萨依铜镍矿化点和豹子沟金矿点最具找矿潜力;④在系统总结研究区含矿层位、成矿地质背景、成矿时代及成矿规律的基础上,划分了2个成矿远景区,圈定2个找矿靶区,并对优势矿产资源潜力进行了初步分析。

In order to find out the metallogenic law and metallogenic background of copper-nickel deposit in Early Paleozoic and gold deposit in Early Mesozoic in East Kunlun area of Xinjiang Province,the authors of this paper have carried out four 1∶50000 mineral geological survey sheets(Hongtulin Temple sheet and others)in Aquedun area of Ruoqiang County in Xinjiang Province,using the the working technical method of Prospecting discovery-Law summary-New area discovery.The new progress and main achievements are as follows:①The basic-ultrabasic intrusions,exposed in Tuteka-Hongtulin region with the same characteristics of magnesium-iron and super magnesium-iron rock,were the product under the combination of depleted mantle and lithosphere mantle in an early cracking environment of Early Devonian period,rather than the ophiolite fragments.②The pomegranate amphibolite was firstly found in Baishahe Formation of Jinshuikou Group,which was lenticular in gneiss.The two groups of the metamorphic ages in this research were closed to the high pressure metamorphic age(450~430 Ma)and retrogressive metamorphism age(420~405 Ma)in previous research from eclogite and pomegranate amphibolite in East Kunlun,which indicating that there was a large high pressure metamorphic belt(greater than 1000 km)in Early Paleozoic in East Kunlun.It was of important significance to discussing the tectonic evolution of East Kunlun orogenic belt in Palaeozoic.③Through the comprehensive verification of 1∶50000 geochemical anomalies,the authors have discovered six new gold and copper-nickel mineral occurrences,especially the most potential prospecting occurrences of Yugusayi copper-nickel mineralization deposit and Baozigou gold mineralization deposit.④On the basis of the systematic summary of ore-bearing horizon,ore-forming geological background,ore-forming times and ore-forming laws in the study area,2 ore-forming prospect areas are divided and 2 ore-prospecting target areas are delineated.Besides,the potential of dominant mineral resources is preliminarily analyzed.