The Bayinsukhtu tungsten deposit is a newly discovered quartz‐vein tungsten deposit in the Xing'an–Mongolia Orogenic Belt (XMOB) in southern Mongolia, hosted by the Bayinsukhtu granite porphyry. The granite porphyry is located mainly south of the study area, over 3 km². The rock consists of quartz and feldspar phenocrysts in a fine‐grained matrix, also mainly composed of feldspar and quartz. The granite porphyry samples demonstrate high SiO₂ and high alkalinity. All samples also straddle the high‐potassium calc‐alkaline series. In a plot of the molar ratios of A/NK versus A/CNK, the granites are metaluminous. The chondrite‐normalized REE patterns are characterized by large negative Eu anomalies and fractionated LREEs. The U–Pb age of zircons from the granite porphyry is 298.8 ± 1.8 Ma, and the Sm–Nd age of the five wolframite samples from the tungsten deposit is 303 ± 19 Ma. The cooling age of the granite porphyry and tungsten mineralization is within the error of measurement and is of the Late Carboniferous age. Geological and geochronological evidence shows that the tungsten mineralization and the granite porphyry at Bayinsukhtu are genetically closely related and that they are results of Carboniferous magmatism. Their tectonic setting is related to the accretion of the Central Asian Orogenic Belt during the late Paleozoic era.

中文翻译：

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蒙古南部Bayinsukhtu钨矿床的锆石U-Pb和黑钨矿Sm-Nd测年及其地质意义

Bayinsukhtu钨矿床是在蒙古南部的兴安-蒙古造山带（XMOB）中新发现的石英脉钨矿床，由Bayinsukhtu花岗岩斑岩带主。花岗岩斑岩主要位于研究区域的南部，超过3 km ²。岩石由石英和长石的细晶组成，颗粒细密，也主要由长石和石英组成。花岗岩斑岩样品显示出高SiO ₂和高碱度。所有样品还跨越了高钾钙碱性系列。在A / NK与A / CNK的摩尔比的曲线图中，花岗岩是金属的。球粒陨石归一化的REE模式的特征是大的负Eu异常和分级的LREE。花岗岩斑岩中锆石的U–Pb年龄为298.8±1.8 Ma，钨矿中5个黑钨矿样品的Sm–Nd年龄为303±19 Ma。花岗岩斑岩和钨矿的冷却年龄在测量误差范围内，属于石炭纪晚期。地质和年代学证据表明，Bayinsukhtu的钨矿化与花岗岩斑岩在遗传上密切相关，并且是石炭纪岩浆作用的结果。