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内蒙古阿拉善右旗努日盖铜金矿地质特征研究
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摘要
本文在总结、分析前人成果资料的基础上,以区域成矿学理论为指导,运用现代地质学、矿床学及相关专业、学科的基本理论与方法,将研究区的区域地质背景及其构造岩浆演化与成矿作用研究相结合,初步总结了研究区基础地质、矿床地质特征、岩石地球化学特征、矿床成因类型与成矿规律,对研究区铜金矿资源远景进行评价并提出了对该区进一步矿产勘查工作的新思路。
     通过对内蒙古阿拉善右旗努日盖铜金矿区进行野外地质调查,对铜金矿体及赋矿岩体石英闪长岩进行岩石地球化学组成、微量元素及稀土元素含量分析测试,认为库和乌拉石英闪长岩体既是铜金矿的赋矿围岩又是矿床的成矿母岩,岩体40Ar-39Ar同位素测年结果为278.0±2.0Ma,形成时代为早二叠世,库和乌拉石英闪长岩属于钙碱性岩,稀土元素球粒陨石标准化配分曲线为轻稀土略富集型,LREE/HREE为6.83~6.92,(La/Yb)N为7.23~7.29,δEu=0.93~0.98,δCe=0.90~0.91;大离子亲石元素(Ba、Sr)和不相容元素(Zr、Hf)明显的富集,与活动大陆边缘有关的钙碱性岩石相似。研究认为库和乌拉石英闪长岩体是在板块碰撞条件下形成于造山带的深源岩浆演化产物,具备形成岩浆控制型铜金矿的地质地球化学条件。
     根据矿体的产出形态,可以判定努日盖铜金矿受断裂构造控制成矿,属华力西晚期板块碰撞条件下形成的断裂控制型岩浆热液铜金矿。
This paper summarizes the results of the previous data,based on the study of the basictheories and methods of regional metallogenic theory,modern geology,the science of mineraldeposits and relative professionals. Combined the regional geological background withtectonic-magmatic evolution and mineralization, it summarizes the basic geology,geologicalfeatures of mineral deposits,rock geochemistry, genesis type and mineralization regularity.Finally, the future situation of the copper-gold resources in the area is evaluated and the newideas for further mineral exploration are proposed.
     By means of the field geological investigation of Nurigai copper-gold mine area inright-banner of Alxa of Inner Mongolia and the analysis and tests of the rock geochemicalcomposition, trace elements and REE content of the copper-gold ore body and the quartzdiorite,the author realized Kuhewula quartz diorite is not only the surround rock but also theore-forming rock of the deposit, the ages of the quartz-diorite being 278.0±2.0Ma formed inearly Permian period, according to 40Ar-39Ar isotopic dating and being the calc-alkalineseries, Chondrite-normalized REE patterns being LREE slightly richer,LREE/HREE 6.83~6.92,(La/Yb)N 7.23~7.29,δEu 0.93~0.98,andδCe 0.90~0.91,large-ion lithophileelements (Ba、Sr) and incompatible elements(Zr、Hf) being enriched and similar to thecalc-alkaline series of active continental margins. The reseach results in the conclusion ofKuhewula quartz diorite body is the product of magma evolution within deep-source oforogenic belt formed in the condition of plate-collision with the geological and geochemicalconditions forming magma controlled copper-gold deposit.
     According to the output form of the ore,Nurigai copper-gold was formed under the controlof the faults and it is a kind of magmatic hydrothermal copper-gold mine under the conditionsof fracture-controlled late Variscan plate collision.
引文
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