| 梁 颂,王雪梅,杨晓飞.阿尔金瓦石峡南花岗伟晶岩型锂矿床围岩岩石学与岩石化学特征研究[J].甘肃地质,2025,34(4):8-17 |
| 阿尔金瓦石峡南花岗伟晶岩型锂矿床围岩岩石学与岩石化学特征研究 |
| WALL ROCKS PETROLOGICAL AND GEOCHEMICAL CHARACTERISTICS OF GRANITE-PEGMATITE VEIN TYPE LITHIUM DEPOSITS IN THE SOUTH WASHIXIA IN THE ALTYN TAGH |
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| DOI： |
| 中文关键词: 变质沉积岩 岩石学特征 稀有金属综合利用潜力 阿尔金地区 |
| 英文关键词:metasedimentary rocks petrological characteristics comprehensive utilization of rare metals Altyn Tagh region |
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| 中文摘要: |
| 阿尔金瓦石峡南地区花岗伟晶岩脉型锂矿床是近年来发现的具有工业规模的中型锂矿床，其临近岩脉的围岩中富含稀有金属元素Li、Be、Rb、Cs、Nb、Ta，但是否具有综合利用价值尚未可知。本文以瓦石峡南花岗伟晶岩脉型锂矿床的围岩—变质沉积岩为研究对象，在详细岩矿鉴定的基础上，对其进行了全岩主微量元素分析。 显微镜下观察表明，变质沉积岩主要矿物包括石英、黑云母、白云母和电气石，副矿物有绿泥石、磷灰石、钛铁矿、金红石、独居石等。 全岩地球化学分析结果显示，变质沉积岩具有较高的Al2O3、Fe2O3和K2O含量，SiO2含量变化较大，原岩类型为砂岩和厚层泥岩；变质沉积岩富含稀有金属，Li、Be、Rb、Cs、Nb、Ta含量分别为455 × 10－6 ~ 5 530 × 10－6、0 ~ 162 × 10－6、240 × 10－6 ~ 2 160 × 10－6、61 × 10－6 ~ 1 050 × 10－6、11 × 10－6 ~ 132 × 10－6、1 × 10－6 ~ 234 × 10－6，其中Li、Rb、Cs含量达到综合利用标准，具有开发利用潜力，而Be、Nb、Ta含量未达到综合利用标准，开发利用潜力低。 反映矿区变质沉积岩中富集稀有金属，为进一步勘探稀有金属资源提供新思路。 |
| 英文摘要: |
| Abstract：The south Washixia Li deposit was newly discovered in the southern part of the Washixia, located in the Altyn Tagh region of Northwest China. The orebody mainly occurs in the granite pegmatite dike, and the metasedimentary host rocks contain higher Li, Rb, Cs but it remains unknown whether they have comprehensive utilization value. This paper examines the metasedimentary rocks of southern Washixia using major and trace element geochemistry of whole rock and based on the detailed rock-mineral identification. The metasedimentary rocks are dominated by quartz or mica schist. Petrographically, these metasedimentary rocks include abundant quartz, biotite, muscovite and tourmaline, and the accessory minerals include chlorite, apatite, ilmenite, rutile, monazite, etc.. The metasedimentary rocks feature relatively high contents of Al2O3, Fe2O3 and K2O with a greatly varying SiO2 content, and their protolith types are sandstone and thick-layered mudstone. The metasedimentary rocks are enrichment of rare metal elements Li （455 × 10-6 ~ 5 530 × 10-6）, Be （0 ~ 162 × 10-6）, Rb（274 × 10-6 ~ 2 160 × 10-6）, Cs （61 × 10-6 ~ 1 050 × 10-6）, Nb（11 × 10-6 ~ 132 × 10-6） and Ta（1 × 10-6 ~ 234 × 10-6 ）. Especially, the average of Li, Rb, Cs reach the lowest production grade, while Be, Nb and Ta below its grade. The enrichment of rare metals in the metasedimentary rocks in this paper provides new ideas for further exploration of rare metal resources. |
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