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藏北东窝东铜多金属矿床含矿斑岩年代学、Sr-Nd-Pb同位素及成矿预测

发布时间:2018-05-31 06:30

  本文选题:SHRIMP锆石U-Pb年代学 + Sr-Nd-Pb同位素 ; 参考:《地质学报》2017年09期


【摘要】:东窝东铜多金属矿床位于羌塘地体南缘,班公湖-怒江成矿带西段,多龙铜金矿集区东侧,是新发现的重要找矿前景区。为进一步确定矿区成矿地质条件及找矿潜力,通过对矿区详细的地质调查和钻孔编录,运用离子探针(SHRIMP)对含矿斑岩进行锆石年代学研究,并利用等离子质谱仪(ICP-MS)对其进行地球化学和SrNd-Pb同位素分析。结果显示,东窝东矿区含矿斑岩结晶时代为122 Ma,是区域早白垩世成矿事件的产物,Sr-NdPb同位素组成(Sr初始值为0.7052~0.7062,143 Nd/144 Nd比值为0.512365~0.512409,εNd(t)值为-4.05~-3.88;~(206)Pb/~(204)Pb、~(207)Pb/~(204)Pb、~(208)Pb/~(204)Pb分别为18.691~18.823、15.638~115.796、38.649~38.924,揭示含矿斑岩岩浆源区有明显的壳幔混合,可能为来源于班怒洋俯冲环境下的新生下地壳。为科学判定矿区成矿潜力,解决矿区找矿瓶颈问题,综合分析矿区地质、物探(1/1万磁法和激电中梯测量)和化探(1/1万水系沉积物测量)成果后认为,东窝东矿区有良好的成矿地质条件,物、化探异常分布集中,叠合较好,存在重要找矿潜力,建议以斑岩-浅成低温热液型铜多金属矿床为勘查找矿方向。
[Abstract]:The Dongwodong copper polymetallic deposit is located in the southern margin of Qiangtang terrane, the western section of Bangong Lake-Nujiang metallogenic belt, and the east side of Duolong copper and gold deposit concentration area. In order to further determine the ore-forming geological conditions and ore-prospecting potential, the zircon chronology of ore-bearing porphyry is studied by using ion probe shrimp through detailed geological investigation and borehole cataloging in the ore area. The geochemistry and SrNd-Pb isotope analysis were performed by plasma mass spectrometer (ICP-MS). The results show that 涓滅獫涓滅熆鍖哄惈鐭挎枒宀╃粨鏅舵椂浠d负122 Ma,鏄尯鍩熸棭鐧藉灘涓栨垚鐭夸簨浠剁殑浜х墿,Sr-NdPb鍚屼綅绱犵粍鎴,

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