内蒙碾子沟钼矿床辉钼矿Re-Os同位素年龄及其地质意义
The molybdenite Re-Os dating from the Nianzigou Mo deposit, Inner Mongolia and its geological significance
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摘要: 内蒙古碾子沟石英脉型钼矿床是一新发现的钼矿床，通过对主要钼矿体6件辉钼矿样品的Re-Os同位素分析，获得了150.2±2.2~154.4±2.2Ma之间、平均152.4±1.3Ma（2σ误差，MSWD=1.6）的同位素模式年龄，及一个相关性很好的等时线年龄154.3±3.6Ma（2σ误差，MSWD=1.9），表明碾子沟钼矿床形成于晚侏罗世，属中国东部燕山期大规模钼成矿期成矿，是中国东部中生代构造体制大转折背景下的产物。碾子沟钼矿床辉钼矿的铼含量介于12.6×10-6~37.0×10-6，平均24.9×10-6，通过与其它钼矿床对比，初步认为碾子沟钼矿床成矿物质具有壳幔混源、偏壳源特征。
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关键词:
- Re-Os同位素测年 /
- 碾子沟钼矿 /
- 西拉沐沦钼矿带 /
- 内蒙古
Abstract: The Nianzigou Mo deposit, Inner Mongolia, is a recently discovered large-quartz veins type Mo deposit. Six samples of molybdenite for Re-Os isotopic dating are analyzed and the model ages obtained from 150.2±2.2 to 154.4±2.2Ma, averaging 152.4±1.3Ma(2σ，MSWD=1.6), and a good isochronic age of 154.3± 3.6Ma(2σ, MSWD=1.9). It is indicated that the Nianzigou Mo deposit was formed in the Late Jurassic which belongs to the large-scale Yanshan molybdenum metallogenic period, and the tectonic settings are Mesozoic tectonic regime transformation of eastern China. The Re contents of the molybdenite are 12.6×10-6 to 37.0×10-6, averaging 24.9×10-6. According to the contents of Re in Nianzigou and contrasting with other molybdenum-bearing deposits, we consider the ore-forming materials of Nianzigou Mo deposit are derived from the crust-mantle mixed source and mainly from the crustal source. -
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