Distribution and occurrence of Cs and other rare elements in contact metamorphic rocks of X03 supergiant deposit in Jiajika, Sichuan and its comprehensive utilization suggestion
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摘要:研究目的
甲基卡稀有金属矿区是中国规模最大的花岗伟晶岩型稀有金属矿床富集区，X03号脉是近年来该矿区发现的以锂为主的超大型稀有金属矿床，在其围岩中发育电气石、堇青石化接触变质带，形成的蚀变岩具有Li、Rb、Cs等稀有金属矿化。Cs是重要的稀有金属元素之一，寻找更多可利用的铯资源成为当务之急。
研究方法对钻孔岩芯中电气石角岩、堇青石化片岩等接触变质岩样品进行了稀有元素含量分析，并采用LA-ICP-MS对电气石、堇青石、黑云母、白云母等变质矿物进行了单矿物微区分析。
研究结果接触变质岩中Li、Rb、Cs具有较高的含量，其平均值分别为0.296%、0.067%、0.052%，均达到综合利用的边界品位或最低工业品位，其特征与蚀变岩型铯云母岩矿床极其相似。Cs元素主要以类质同象的形式赋存于黑云母之中，是引起接触变质岩石Cs元素富集的主要原因。
结论在X03号脉的进一步勘查中，应对接触变质岩石中稀有金属资源，特别是Cs资源进行评价，并对其进行综合利用。
创新点：分析了X03号脉接触变质岩中Cs等稀有元素的含量，指出了Cs元素主要以类质同象的形式赋存于黑云母之中，应对其进行综合利用。
Abstract:This paper is the result of mineral exploration engineering.
ObjectiveThe Jiajika rare metal mining area is the largest granite pegmatite-type rare metal deposit in China. The recently discovered Vein X03 is an supergiant rare metal deposit dominated by lithium. The tourmaline and cordierite contact metamorphic zones have been developed in the surrounding rocks of Vein X03, and mineralization of rare metals such as Li, Rb, and Cs occurs in the altered rocks. Cs is one of the important rare metal elements, and it is imperative to find more available cesium resources.
MethodsIn this research, the content of rare elements in the contact metamorphic rock samples in drilled cores, such as tourmaline cornerstone and cordierite schist, was analyzed. The monomineral microanalysis of tourmaline, cordierite, biotite and white mica was conducted using LA-ICP-MS.
ResultsHigh contents of Li, Rb, and Cs in the contact metamorphic rocks were observed, and the average values were 0.296%, 0.067%, and 0.052%, respectively. The contents of these elements reach the boundary grade or the lowest industrial grade for comprehensive utilization, and its characteristics are very similar to those of altered rock cesium mica deposits. Cs element mainly occurs in biotite in the form of isomorphism, which is the main reason for the enrichment of Cs in the contact metamorphic rocks.
ConclusionsIn the further exploration of Vein X03, the rare metal resources, especially Cs resources, in the contact metamorphic rocks should be evaluated and comprehensively utilized.
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致谢: 感谢中国地质科学院矿产资源研究所王登红研究员对研究工作的指导及审稿专家的宝贵意见和建议。
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图 1 甲基卡稀有金属矿区地质简图
1—二云母花岗岩；2—微斜长石型伟晶岩；3—微斜长石钠长石型伟晶岩；4—钠长石型伟晶岩；5—钠长石锂辉石型伟晶岩；6—钠长石锂云母型伟晶岩；7—伟晶岩脉编号；8—类型分带线；9—类型分带编号；10—研究的矿体；Ⅰ—微斜长石伟晶岩带；Ⅱ—微斜长石钠长石带；Ⅲ—钠长石带；Ⅳ—锂辉石带；Ⅴ—锂(白)云母带
Figure 1. Simplified geological map of Jiajika rare metal deposit
1-Two-mica granite; 2-Microcline pegmatite; 3-Microcline-albite pegmatite; 4-Albite pegmatite; 5-Albite-spodumene pegmatite; 6-Albite lepidolite pegmatite; 7-Serial number of pegmatite dike; 8-Boundary between different types; 9-Serial number of different zones; 10-Studied orebody; Ⅰ-Microcline pegmatite zone; Ⅱ-Microcline-albite zone; Ⅲ-Albite zone; Ⅳ-Spodumene zone; Ⅴ-Lepido-lite (muscovite) zone
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图 2 甲基卡X03号脉地质图（a）和勘探线剖面图（b、c）（据付小方等，2019）
1—第四系；2—上三叠统十字石红柱石二云母片岩；3—二云母花岗岩；4—伟晶岩矿脉及编号；5—第四系残积物；6—十字石红柱石二云母片岩；7—堇青石化十字石红柱石二云母片岩；8—电气石角岩；9—勘探线及编号
Figure 2. Geological map(a) and profile(b, c)of X03 vein in Jiajika(after Fu Xiaofang et al., 2019)
1-Quaternary; 2-Upper Triassic staurolite andalusite two mica schist; 3-Two mica granite; 4-Pegmatite vein and its number; 5-Quaternary remnant; 6-Staurolite andalusite two mica schist; 7-Cordierite staurolite andalusite two mica schist; 8-Tourmaline hornfel; 9-Exploration line and its serial number
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图 3 接触蚀变岩石中Li、Cs、Rb含量散点图
Figure 3. Scatter plots of Li, Cs and Rb contents in altered rock
表 1 X03号脉接触变质岩稀有元素分析结果
Table 1 Contents of rare metals of contact metamorphic rock from X03 vein in Jiajika
下载: 导出CSV
表 2 X03号脉不同类型接触变质岩石中稀有元素含量
Table 2 Contents of rare metals of different types of contact metamorphic rocks from X03 vein in Jiajika
下载: 导出CSV
表 3 X03号脉接触变质矿物稀有元素分析结果（10-6）
Table 3 Contents of rare metals of contact metamorphic mineral from X03 vein in Jiajika(10-6)
下载: 导出CSV
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