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。
Abstract:This paper is the result of mineral exploration engineering.
Objective The 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.
Methods In 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.
Results High 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.
Conclusions In 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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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)
Figure 2.
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
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
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)
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