湘中矿集区杨家山石英脉白钨矿床的白云母和锡(5)
6 结论
(1)杨家山钨矿床LA-ICP-MS 锡石的206Pb/238U加权平均年龄为410.(MSWD=1.5,n=24),白云母40Ar-39Ar等时线年龄(398.),二者在误差范围内基本一致,锡石和白云母都与白钨矿密切共生,限定杨家山钨矿床的成矿时代为晚泥盆世。
(2)基于前人对杨家山矿区内白马山岩体的黑云母二长花岗岩的成岩年龄和同位素数据,本文认为杨家山是与区内发育的同期岩浆侵入活动有成因联系的石英脉型白钨矿床。
(3)杨家山钨矿床与雪峰山地区发育的加里东期金矿床成矿时代基本一致,暗示它们为晚泥盆世同一成矿事件的产物,但是其是否具有成因联系还需要进一步研究。
致谢野外工作期间得到了湖南省地质矿产勘查开发局418队的支持与帮助;LA-ICP-MS锡石U-Pb测试过程中得到了南京大学章荣清副教授的热心帮助和指导;白云母40Ar-39Ar测试得到了核工业北京地质研究院分析测试中心张佳工程师的全力支持;两位审稿专家和本刊主编提出了宝贵的修改意见,让本文质量有了很大提高;在此一并表示感谢!
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