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地质论评  2005 

四川缅萨洼金矿两类矿石绢云母^40Ar/^39Ar年龄及其地质意义

Keywords: 四川绢云母蚀变花岗岩含金石英脉年龄地质意义

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Abstract:

缅萨洼金矿位于扬子地台西缘龙门山锦屏山造山带南段,扬子地台与松潘甘孜造山带的过渡地带,是与剪切带有关的金矿床.本文通过对蚀变花岗岩和含金石英脉两类矿石中的绢云母进行40Ar/39Ar快中子活化年龄测试,获得蚀变花岗岩中绢云母坪年龄和等时线年龄分别为23.31±0.07Ma和23.26±0.42Ma;含金石英脉中绢云母的坪年龄和等时线年龄分别为22.98±0.31Ma和22.58±0.31Ma.这些数据表明缅萨洼金矿成矿作用主要发生在23Ma左右,这对于认识扬子地台西缘金矿床形成的地球动力学背景具有重要意义.

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