| 甘肃北山红尖兵山钨矿床的40Ar-39Ar同位素年代学研究 |
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| 引用本文：江思宏，聂凤军.2006. 40Ar-39Ar geochronology of Hongjianbingshan tungsten deposit in Beishan Mountain, Gansu Province, China[J].Mineral Deposits,25(1):89~94 |
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| 基金项目:国家自然科学基金项目（编号：40073015）、国家地质调查项目（编号：20031020 0001_01）和科技攻关项目(2001BA609A_03) |
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| 中文摘要:文章对红尖兵山钨矿云英岩中的白云母进行了40Ar-39Ar 同位素年代学研究，获得的坪年龄为（216.6±1.6）Ma（2σ），等时线年龄为（215.2±2 .8）Ma，MSWD＝0.47，40Ar/36Ar初始比值为333±47。等时线年龄与坪年龄 在误差范围内完全一致，可认为该结果近似代表了黑钨矿的形成时代，即红尖兵山的黑钨矿 形成于印支期。 |
| 中文关键词:地球化学 白云母 40Ar/39Ar同位素年龄 印支期 红 尖兵山 甘肃北山 |
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| 40Ar-39Ar geochronology of Hongjianbingshan tungsten deposit in Beishan Mountain, Gansu Province, China |
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| Abstract:Located in the western part of Hongshishan_Heiyingshan terrane within Kazakhstan plate, the Hongjianbingshan deposit is one of the most important tungsten depos its in northwest China. Tungsten mineralization occurs mainly within Early Carbo niferous rhyolite tuff and rhyodacite of Baishan Formation as topaz_quartz veins , and partly in monzogranite stocks as massive greisen blocks and stratoid layer s. In order to obtain the ore_forming age, the authors measured the muscovite se parated from the greisen in the Hongjianbingshan tungsten deposit by the 40Ar/39Ar incremental heating method, and the results yield a 40Ar-39Ar plateau age of (216.6±1.6) Ma, an isochron age of (215.2 ±2.8) Ma with MSWD being 0.47, and an initial 40Ar/36Ar value o f 333±47. As muscovite in greisen and that in wolframite were formed almost sim ultaneously, the 40Ar-39Ar dating result of the muscovite can re present the precipitation age of the wolframite or the ore_forming age of the Ho ngjianbingshan tungsten deposit. It is shown that the ore_forming process of the Hongjianbingshan tungsten deposit was controlled by Indosinian magmatism. The a uthors believe that the dating data are of great significance in the study of th e regional geological evolution, the investigation of the metallogeny of the met allic deposits and the exploration of the concealed tungsten deposits in the Bei shan Mountain, Gansu Province. |
| keywords:geochemistry, muscovite,40Ar/39Ar age, Indo sinian, Hongjianbingshan, Beishan Mountain, Gansu |
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