投稿时间：2021-11-13
修订日期：2022-11-17
网络发布日期：2023-03-07
中文摘要:赣北石门寺钨多金属矿床是江南钨矿带上的超大型斑岩型钨矿床，具有重要的经济价值和研究意义。白云母作为常见的造岩矿物之一，能够指示岩浆和热液演化的不同阶段。从成矿的角度来看，在白钨矿成矿过程中，斜长石蚀变形成白云母和石英，提供了重要的Ca2+来源。而短波红外技术目前广泛应用于矿产勘查领域，利用白云母短波红外特征能够快速便捷地进行钨矿的勘查找矿研究。文章利用短波红外技术，对石门寺矿床中的白云母开展光谱测试，结合其岩相学特征和地球化学特征，研究了白云母对白钨矿成矿的勘查指示意义。研究结果表明：含矿岩体中的白云母多为次生白云母，Si的平均离子数为3.245，Al的平均离子数为2.52，具有富硅贫铝的特点，其Al-OH吸收位置位于2209~2216 nm；而无矿岩体中的白云母多为原生白云母，Al的平均离子数为2.85，相对含矿岩体白云母Al的平均离子数较高，Si的平均离子数相对较低为3.08，Al-OH吸收位置位于2198~2208 nm之间。n（Al）（Al离子数）与Al-OH吸收波长呈现负相关关系。研究结果证明了白云母短波红外特征对石门寺钨矿床的重要指示意义，Al-OH吸收位置偏向长波方向的多硅白云母成为找矿的重要依据，为该矿床及外围的勘查找矿研究提供了有效的技术支撑，同时对其他斑岩型钨矿床的找矿勘查具有示范作用。
Abstract:The Shimensi tungsten polymetallic deposit in northern Jiangxi Province is a giant porphyry tungsten deposit in Jiangnan Tungsten Metallogenic Belt，which has important economic value and research significance. As one of the common rock forming minerals, the changes of composition and texture of muscovite can reflect the differentiation degree and magmatic hydrothermal transformation of highly evolved granite, and indicate different stages of magmatic and hydrothermal evolution. From the perspective of mineralization, the alteration of plagioclase to form muscovite and quartz provides an important source of Ca2+ in the process of scheelite mineralization. At present, shortwave infrared spectrum technology is widely used in the field of mineral exploration. Using shortwave infrared characteristics of muscovite can carry out the prospecting and research of tungsten deposits quickly and conveniently. This paper uses shortwave infrared technology to carry out spectral test and analysis of muscovite from the Shimensi deposit. Combined with its petrographic and geochemical characteristics, the significance of muscovite in the exploration of scheelite mineralization is summarized. The results show that muscovite in orebearing intrusions is mostly secondary muscovite, the average ion number of Si is 3.245, and the average ion number of Al is 2.52, which is characterized by rich silicon and poor aluminum, and its Al-OH absorption position is between 2209~2216 nm; The muscovite in the barren intrusions is mostly primary muscovite, and the average ion number of Al is 2.85, compared with the muscovite in the ore-bearing intrusions, the average ion number of Al is higher, and the average ion number of Si is relatively low, which is 3.08. The absorption position of AlOH is between 2198~2208 nm. There is a negative correlation between n(Al) (Al ion number) and Al-OH absorption wavelength. The research results of this paper prove that the shortwave infrared characteristics of muscovite have important indicating significance for the mineralization of the Shimensi tungsten deposit, and the phengite whose Al-OH absorption position tends to the longer wave direction has become an important basis for prospecting, which provides effective technical support for the exploration of this deposit and its periphery, and have demonstration significance for the exploration of other porphyry tungsten deposits.
keywords:geology scheelite muscovite shortwave infrared Shimensi
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基金项目:本文得到国家自然科学基金面上项目（编号：42172332）、中央级公益性科研院所基本科研业务费专项基金（编号：KK2102，KK2017）、江西省科学技术厅国家科技奖后备项目培育计划（2020年度）（编号：20203AEI91004）、中国地质调查项目（编号：DD20190167）联合资助
引用文本：
张忠雪,代晶晶,王先广,胡正华,万新,彭勃,傅明海,赵龙贤.2023.赣北石门寺超大型钨矿床白云母短波红外特征及其勘查指示意义[J].矿床地质,42(1):116~127ZHANG ZhongXue,DAI JingJing,WANG XianGuang,HU ZhengHua,WAN Xin,PENG Bo,FU MingHai,ZHAO LongXian.2023.Shortwave infrared characteristics of muscovite from giant Shimensi tungsten deposit in northern Jiangxi Province and implication to exploration[J].Mineral Deposits42(1):116~127
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