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矿床地质  2008 

川西冕宁-德昌REE成矿带成矿年代学研究:热液系统维系时限和构造控矿模型约束

Keywords: 地质学,成矿年龄,构造模式,川西冕宁-德昌REE成矿带,川西,冕宁,德昌,成矿带,年代学研究,热液活动,系统变化,构造,控矿模型,约束,metallogenicbelt,Geochronology,Sichuan,complexes,model,tectonic,activities,hydrothermal,duration,滑移

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Abstract:

川西冕宁-德昌REE成矿带是中国最重要的REE成矿带之一,包括牦牛坪超大型REE矿床、大陆槽大型REE矿床、木落寨中型REE矿床和里庄小型REE矿床以及一系列矿点和矿化点.REE成矿作用与碳酸岩-碱性杂岩体有关,受印度-亚洲大陆碰撞带的一系列新生代走滑断裂系统控制,岩体主要侵位于元古代结晶基底岩石和古生代一中生代沉积盖层中.40Ar/39Ar快中子活化分析表明,大陆槽白云母、里庄黑云母和木落寨金云母的40Ar/99Ar坪年龄分别为13.2Ma、30.6Ma和35.5Ma,结合前人成岩成矿年龄资料,牦牛坪矿床岩浆-热液活动时限约12Ma.大陆槽矿床约5Ma,而里庄矿床则为2Ma,热液活动持续时间与矿床的REE储量存在正相关关系.研究发现,冕宁-德昌REE矿带从北到南,成岩成矿年龄逐渐变新,时间跨度长达27Ma;碳酸岩-正长岩岩浆初始活动时间与雅砻江左旋走滑断裂开始活动时间相一致,成岩成矿年龄的系统变化,有可能是由于雅砻江左旋走滑断裂右侧板片在相对固定的幔源岩浆"热点"上从南至北滑移造成的(相对于左侧板片).

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