| 南岭地区成钨、成锡花岗岩组合的几个判别标志 |
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| 引用本文： | 程顺波,付建明,马丽艳,卢友月.南岭地区成钨、成锡花岗岩组合的几个判别标志[J].华南地质与矿产,2014(4):352-360. |
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| 作者姓名： | 程顺波 付建明 马丽艳 卢友月 |
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| 作者单位： | 中国地质调查局武汉地质调查中心，中国地质调查局花岗岩成岩成矿研究中心，武汉 430205 |
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| 基金项目： | 中国地质调查局地质大调查项目 |
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| 摘 要： | 南岭地区钨锡多金属成矿作用和区内中酸性-酸性花岗岩有着密切的成因联系。利用已发表的和野外收集的地质资料,本文尝试对区内成钨锡花岗岩组合(包括与钨锡矿相关的含钨锡花岗岩和成钨锡花岗岩)进行宏观地质判别。判别过程采用循序渐进的方式,首先将成钨锡花岗岩组合与不成矿花岗岩相区别,然后将含锡花岗岩和含钨花岗岩互相区别开来。相对于不成矿花岗岩,成钨锡花岗岩组合通常具有W、Sn、F、B化探组合异常、多期多阶段演化特点、适度的构造叠加(即存在明显的热液活动)等共同特点,且三者缺一不可。不成矿花岗岩一般具有W、Sn、F、B化探组合为背景值,岩性单一,少见晚期岩株、岩脉(演化不充分)及蚀变的特征。在野外地质工作中,含锡花岗岩一般为花岗闪长岩-二长花岗岩-二云母花岗岩岩性组合。基性端元以普遍发育暗色微粒包体、常见角闪石、含较多的黑云母为鉴别特征。酸性端元中可以含有少量白云母。而含钨花岗岩以黑云母二长花岗岩-二云母花岗岩-白云母花岗岩岩性组合为主,常见含B矿物电气石,基性端元少见或不见角闪石、含较少的黑云母,仅见变质岩、围岩捕掳体和黑云母团块,酸性端元白云母含量较高等组合特征可以与含锡花岗岩相区别。
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| 关 键 词： | 成锡花岗岩组合 成钨花岗岩组合 判别标志 野外地质特征 南岭地区 |
Some discrimination criterions of W/Sn mineralization re-lated granitoids in Nanling Range |
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| CHENG Shun-Bo,FU Jian-Ming,MA Li-Yan,LU You-Yue.Some discrimination criterions of W/Sn mineralization re-lated granitoids in Nanling Range[J].Geology and Mineral Resources of South China,2014(4):352-360. |
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| Authors: | CHENG Shun-Bo FU Jian-Ming MA Li-Yan LU You-Yue |
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| Institution: | (Wuhan Center ＆ Research Center of Granitic Diagenesis and Mineralization, Chinese Geological Survey, Wtthan 430205, China) |
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| Abstract: | Most tungsten-tin polymetallic deposits are undoubtedly coexist with intermediate-acid granitoids in Nanling Range, South China. This paper focus on the field identifications of granitoids related to W/Sn mineralization. In the discrimination process, granitoids related to W/Sn mineralization are firstly differentiated from those unmineralized, and further divided into W series and Sn series from each other. Compared to those unmineralized granitoids, the majority of mineralized granitoids have positive W, Sn, F, B geochemical anomaly, multiple lithologies and appropriate tectonic superposition（or hydrothermal alteration）. Granitoids unmineralized can be easily identified by W, Sn, F, B background contents, simple lithology, lackness of late granitic stocks/veins and alterations. In field exploration, Sn series are easily indentified by granodiorite-monzogranite-two-mica granite lithologies, widespread MME and hornblend in basic end member with higher biotite content（4-6 wt% or higher）,and low muscovite content（1 wt%） in acid end member. While W series can be differed from Sn series by several other features such as monzogranite-two mica granite-muscovite granite lithologies, biotite noddle,meta-sedimentary and hostrock enclave commonly seen in basic end member with lower biotite content（2-4 wt%）and little hornblend, and identical disseminated tourmaline and high muscovite content（1-2 wt%） in acid members. |
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| Keywords: | W mineralization related granitoids Sn mineralization related granitoids discrimination criterions field observation Nanling Range |
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