广西栗木钨锡稀有金属矿床碱长花岗岩的厘定:《华南地质与矿产》2013年01期

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广西栗木钨锡稀有金属矿床碱长花岗岩的厘定

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8J ^j BO X t0王艳丽 祝新友 刘志刚 傅其斌

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【摘要】:广西栗木钨锡稀有金属矿床内的花岗岩传统定名为中粒斑状铁白云母花岗岩和钠长石花岗岩。电子探针分析表明,栗木两类花岗岩中的钠长石An值均小于5,95%以上的样品An2,均属于碱性长石。显微镜下工作说明,矿物结晶顺序为钠长石→石英+钾长石→黄玉→云母,钠长石是岩浆演化过程中最早结晶的产物,并非钠长石化的结果。在QAP投影中,两类花岗岩落入QA线上的碱长花岗岩区域。故两类花岗岩的确切定名应为中粗粒铁锂云母碱长花岗岩(Ⅰ)和细粒碱长花岗岩(Ⅱ)。水利论文 GNN'IJcO

)p+{Iq8Rd0|:^'M o0【作者单位】:水利论文-oK"v'| b

^9U G,Vn(A J\0中国地质大学(北京);中色地科矿产勘查有限公司;内蒙古有色地质勘查局;昆明理工大学;

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!Z6z8zQ m]0钨锡矿床 碱长花岗岩 广西栗木水利论文J3EQ.DFc

No,Tb'[3Z iP ^'C0【基金】:国家科技支撑课题“湖南锡田地区深部成矿岩体空间结构与成矿预测”(2011BAB04B08)水利论文 u!p-@.u"dr

o)tGq!]0I C0全国危机矿山接替资源找矿项目“湘南-粤北地区锡钨多金属矿床成矿规律总结研究”(20089927)联合资助水利论文*v@T6wOjn(S

Tz{G,D*k"N/Qd0【分类号】:P588.121

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【正文快照】:水利论文 [[+g/SHKc

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广西恭城县栗木钨锡稀有金属矿床的成矿地质体为区内的花岗岩,同位素地质年龄为201~184 Ma,属印支晚期至燕山早期产物[1],新近研究利用与锡矿化密切相关的花岗岩中的白云母40Ar/39Ar法,认定成矿年龄为214Ma±[2],最新研究也认为花岗岩成岩时代为印支晚期(会议交流)。前人一般

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