东昆仑沙丘低缓磁异常区深部铁多金属矿床找矿标志

那陵郭勒河沙丘地区位于东昆仑祁漫塔格早古生代裂陷槽,经历了早古生代及晚古生代—早中生代的复合造山作用,发育多期次岩浆活动和成矿作用,具有较好的铁多金属找矿前景。文章通过研究沙丘铁多金属矿的成矿地质背景、矿床特征、地磁异常和地球化学异常等,探讨了其找矿标志。研究表明:沙丘地区铁多金属矿床成因类型属接触交代型(矽卡岩型),矽卡岩与磁铁矿体在空间分布紧密共生,是重要的找矿标志;引起该区磁异常的主要地质体为闪锌磁铁矿矿石、闪锌磁铁矿化矽卡岩、矽卡岩、闪长岩、硅质岩、玄武岩、钾长花岗斑岩;利用物探磁异常找寻磁铁矿作用显著,在低缓磁异常区、正负异常接触部位是找寻铁多金属矿最重要也是最直接的找矿标志。

Study on the prospecting signs of deep iron polymetallic deposits in the low-rate magnetic anomaly area of the East Kunlun Dune

The mausoleum of goldune area located in East Kunlun Qimantage Early Paleozoic aulacogen, experienced compound orogeny in Early Paleozoic and late Paleozoic to early Mesozoic, with the development of multi period magmatic activity and mineralization, and great iron polymetallic ore prospects.In this paper, the ore-prospecting signs of dune-iron polymetallic ore deposits are discussed by studying the metallogenic geological background, characteristics of deposits, geomagnetic anomalies and geochemical anomalies. The research shows that the genetic type of the iron polymetallicdeposit in the dune area belongs is contact metamorphism (skarn type).The skarn and the magnetite body are closely symbiotic in the spatial distribution, which isan important prospecting indicator.The main geologic bodies causing magnetic anomalies in this area are flash zinc magnetite ore, flash zinc magnetite mineralized skarn, skarn, diorite, siliceous rock, basalt, and potassium long granite porphyry. The use of geophysical magnetic anomalies to find magnetite is very significant, which is the most important and direct prospecting signs for the search for iron-polymetallic deposits, in the low-temperage magnetic anomaly zone and the positive and negative anomaly contact sites.