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津巴布韦太古代克拉通内金矿化作用磁黄铁矿和电气石单样品Pb-Pb测年 被引量:1

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摘要 金-硫化物-电气石矿物组合是大型金矿床的典型特征,在全球范围的金矿床中普遍存在。这一矿物共生组合用于研究金矿床依然有效,且对成矿模型的时代限制性较小。通过对采自津巴布韦太古代克拉通剪切控制矿化带内的单个样品,进行Pb逐步浸析,测得该样品的热液磁黄铁矿形成时代(1.936±0.05Ga),与其共生的更早期的电气石形成时代(2.026±0.02Ga),这表明元古代克拉通内存在多次热液活动。白钨矿-电气石矿石产出于同期(2.65±0.01Ga)的太古代剪切带中,其中相关岩相内的Pb同住素分布平衡,通过单个样品中Pb的同位素逐步浸析,可以追溯历史热液活动。
作者 窦伟 刘强
出处 《四川地质学报》 2015年第A01期126-129,共4页 Acta Geologica Sichuan
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