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地质学报  2009 

云南哈播斑岩型铜(钼金)矿床地质与成矿背景研究

, PP. 1915-1928

Keywords: 哈播,斑岩铜矿,藏东斑岩带,玉龙斑岩铜矿带

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Abstract:

哈播斑岩铜(钼金)矿床位于哀牢山红河新生代成矿带南端西侧,是近年来新发现的一个斑岩型矿床。矿区内出露的哈播侵入体具有多期侵入的特征,花岗岩依次侵入的序列为坪山花岗岩、三道班花岗岩、阿树花岗岩、哈播南山花岗岩(37.3Ma),随后有4期斑岩侵入到哈播南山花岗岩中,依次为黑云母钾长石斑岩、石英钾长石斑岩、石英二长斑岩和晚期黑云母钾长石斑岩岩脉。采用LAICPMS锆石UPb年龄法测定黑云母钾长石斑岩和石英二长斑岩的加权平均年龄分别为36.20±0.20Ma和36.19±0.22Ma,哈播南山花岗岩和4期斑岩具有相似的岩石地球化学特征,都有富钾、高氧化态和类似岛弧花岗岩的岩石地球化学特征,可能具有相同的来源。辉钼矿ReOs年龄显示,哈播矿床的成矿年龄为35.47±0.16Ma。相似的成岩成矿年龄暗示哈播矿床成岩和成矿作用是一个连续的岩浆热液过程,与玉龙斑岩铜矿相似。基于哈播矿床的岩石学、地球化学特点,结合前人关于青藏高原东部斑岩铜矿的研究成果,我们认为哈播斑岩矿床可能为藏东富碱斑岩带向东南的延伸,与玉龙斑岩铜矿带具有相似的成因,为哀牢山红河新生代成矿带的重要组成部分,是晚碰撞构造转换背景下的重要产物。

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