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- W4380151574 abstract "近来南岭地区加里东期钨锡找矿勘查取得较大突破，但其成因机制研究仍相对缺乏。湘西南苗儿山岩体西北部的落家冲矿床是近年新发现的加里东期钨锡矿床，具有良好的钨锡多金属矿找矿前景，其成矿流体的特征和成矿机制有待查明。在详细的野外地质调查基础上，落家冲矿床的成矿过程可划分为四个阶段：蚀变花岗岩-白钨矿阶段(Ⅰ)、云英岩-白钨矿-锡石阶段(Ⅱ)、石英脉-白钨矿阶段(Ⅲ)和石英脉-硫化物阶段(Ⅳ)。本文选取第Ⅰ阶段的锆石和锡石开展了U-Pb定年和锆石Hf同位素分析，对四个成矿阶段的石英矿物进行了流体包裹体以及H-O同位素的研究。获得的锡石U-Pb反等时线年龄(433.0±11Ma)与蚀变花岗岩锆石U-Pb年龄(430.7±2.3Ma)在误差范围内一致，表明矿区的成岩成矿作用均发生于加里东晚期。流体包裹体研究显示第Ⅰ阶段到第Ⅳ阶段，均一温度分别集中在260~380℃、260~320℃、200~320℃和180~220℃之间，呈逐渐降低的趋势，盐度则表现为由第Ⅰ阶段到第Ⅱ阶段陡降，第Ⅱ阶段到第Ⅳ阶段总体变化不大的特点(平均值分别为16.9%、3.9%、4.8%和3.7% NaCleqv)。成岩成矿定年结果、各成矿阶段的成矿流体特征，结合锆石<i>ε</i><sub>Hf</sub>(<i>t</i>)=-7.6~ -5.0、<i>t</i><sub>DM2</sub>=1565~1711Ma，和石英矿物的<i>δ</i><sup>18</sup>O<sub>H<sub>2</sub>O</sub>值从第Ⅰ阶段(3.97‰~5.34‰)到第Ⅳ阶段(-4.99‰~-5.10‰)逐渐降低的特点，以及区域岩体的地球化学特征，本文认为落家冲钨锡矿床是加里东期起源于元古宙地壳重熔的岩浆在经历了高分异演化作用后，流体的沸腾作用以及温度下降造成成矿流体中钨锡等矿质的沉淀所形成。" @default.
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- W4380151574 date "2023-01-01" @default.
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- W4380151574 title "Ore-forming mechanism of Caledonian W-Sn deposit in the Nanling Range: A case study from the Luojiachong deposit, sourthwestern Hunan Province" @default.
- W4380151574 doi "https://doi.org/10.18654/1000-0569/2023.06.07" @default.
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