刘佳, 杨明星, 刘玲. “外蒙”绿松石的成分特征[J]. 宝石和宝石学杂志, 2021, 23(4): 12-19. DOI: 10.15964/j.cnki.027jgg.2021.04.002
引用本文: 刘佳, 杨明星, 刘玲. “外蒙”绿松石的成分特征[J]. 宝石和宝石学杂志, 2021, 23(4): 12-19. DOI: 10.15964/j.cnki.027jgg.2021.04.002
LIU Jia, YANG Mingxing, LIU Ling. Composition Characteristic of Turquoise from Mongolia[J]. Journal of Gems & Gemmology, 2021, 23(4): 12-19. DOI: 10.15964/j.cnki.027jgg.2021.04.002
Citation: LIU Jia, YANG Mingxing, LIU Ling. Composition Characteristic of Turquoise from Mongolia[J]. Journal of Gems & Gemmology, 2021, 23(4): 12-19. DOI: 10.15964/j.cnki.027jgg.2021.04.002

“外蒙”绿松石的成分特征

Composition Characteristic of Turquoise from Mongolia

  • 摘要: “外蒙”绿松石颜色丰富,由蓝色到绿色不等,采用电子探针、激光剥蚀电杆耦合等离子质谱仪分别测定样品主成分含量、微量元素及稀土元素含量。测试结果显示,“外蒙”绿松石样品中Al2O3含量为35.22%~36.73%、P2O5为34.34%~35.84%、CuO为8.27%~9.24%、TFeO为2.20%~3.76%;“外蒙”绿松石样品由蓝色到绿色,其TFeO/CuO比值呈递增趋势, Fe3+含量增加,绿色调增加。EDS面扫测试结果发现,As元素在“外蒙”绿松石样品基底中均匀分布;其中Sr、Ba、Pb的含量较湖北郧阳区、陕西安康等产地的高,U含量较湖北郧阳区、竹山等产地的低,与安徽马鞍山、陕西安康等产地的相当;稀土元素呈现两种不同配分模式图,分别为右倾式,轻重稀土分异明显,Eu亏损不明显及中稀土富集,轻、重稀土分异较前者相对不明显,Eu呈现正异常。通过配分曲线的差异推断,“外蒙”绿松石样品可能存在低温热液交代及风化淋滤两期成矿,前者稀土含量高于后者,且轻稀土富集,后者轻稀土流失,但中稀土和重稀土含量与前者基本一致。通过测试可以确定“外蒙”绿松石的成分特点,初步推断其形成成因,为其产地判别提供一定的参考依据。

     

    Abstract: The turquoise from Mongolia is rich in colour, ranging from blue to green. To enrich the study on the composition of turquoise from Mongolia, this study determined the contents of main components, trace elements, and rare earth elements(REE) by electron probe microanalysis (EPMA) and laser ablation plasma mass spectrometer (LA-ICP-MS). The content of Al2O3, P2O5, CuO and TFeO were 35.22%-36.73%, 34.34%-35.84%, 8.27%-9.24% and 2.20%-3.76% respectively. The TFeO / CuO ratio of the sample increased with the colour change from blue to green. As the increase of Fe3+ content, the green hue of the sample increases. The content of As was as high as 1 453.9-1 760.3 mg/kg. The EDS scanning showed that As was uniform distributed in the sample substrate. The contents of Sr, Ba, and Pb in the samples were higher than those in Anhui, Shaanxi, and Hubei provinces. The U content was similar to that in turquoise samples from Ma'anshan and Ankang of Anhui Province, and lower than that in Yunyang district and Zhushan area of Hubei Province. There were two different patterns of REE distribution, one was right inclined, and the heavy and light rare earth were differentiated, and Eu loss was not obvious; the other was rich in medium rare earth, and the difference between light and heavy rare earth was relatively insignificant, and Eu showed positive anomaly. According to the difference of distribution curves, it was inferred that there were two stages of mineralization of turquoise, low temperature hydrothermal metasomatism and weathering leaching. The rare earth content of the former was higher than that of the latter, and the light rare earth was enriched, while the latter was lost, but the contents of medium rare earth and heavy rare earth were consistent with the former. The author studied and determined the composition characteristics of turquoise in this area and infers the genesis of turquoise and provided the basis for distinguishing the origin of turquoise from Mongolia.

     

/

返回文章
返回