俄罗斯秋明国立大学Alexey Vergunov团队研究了俄罗斯东西伯利亚Kharanorskoe矿床早白垩世煤中蚀变火山灰的化学和矿物成分。2025年3月11日，《地球化学学报》杂志发表了这一成果。

研究组介绍了位于东西伯利亚（俄罗斯）东南部的Kharanorskoe矿床早白垩世Novy-1a煤层中煤矸石的矿物和化学成分数据。煤矸石的矿物成分以高岭石、石英和长石为代表。副矿物有锆石、钛铁矿、独居石（Ce）和磷钇矿（Y）。煤矸石的特点是Ga、Nb、Hf、Ta、Hg、Th和U的浓度很高。煤中，特别是Novy-1a煤层的煤灰中，稀有微量元素的最高浓度集中在煤矸石和煤之间的接触区域。稀土元素Zr、Nb、Y、Ta、Hf、Th和U的富集最为显著。

火山灰岩和与夹层接触的煤灰中元素的范围及其浓度证实了形成火山灰岩的火山碎屑的性质和初始组成的结论，并表明了火山活动在煤矿床地球化学特化形成中的重要作用。所研究的火山灰岩的矿物学和地球化学特征表明，它是由碱性成分的火山灰形成的。

附：英文原文

Title: Chemical and mineral composition of altered volcanic ash in the Early Cretaceous coals of the Kharanorskoe deposit, Eastern Siberia, Russia

Author: Vergunov, Alexey, Arbuzov, Sergey, Kholodov, Aleksei, Novoselov, Andrey, Deeva, Elena, Shadrina, Sofia, Kenesbayev, Bakhtiyar

Issue&Volume: 2025-03-11

Abstract: The paper presents data on the mineral and chemical composition of tonstein in the Early Cretaceous Novy-1a coal seam of the Kharanorskoe deposit located in the southeast of Eastern Siberia (Russia). The mineral composition of the tonstein is represented by kaolinite, quartz, and feldspar. Accessory minerals are zircon, ilmenite, monazite-(Ce), and xenotime-(Y). The tonstein is characterized by high concentrations of Ga, Nb, Hf, Ta, Hg, Th, and U. The highest concentrations of rare trace elements in the coal, and especially in the coal ash of the Novy-1a seam, are localized in the areas of contact between the tonstein and the coal. The enrichment with rare earth elements (REE) Zr, Nb, Y, Ta, Hf, Th, and U is the most significant. The range of elements and their concentration in the tonstein and in the coal ash at the contact with the interlayer confirm the conclusions about the nature and initial composition of the pyroclastics that formed the tonstein and indicate the important role of volcanism in the formation of geochemical specialization of coal deposits. Mineralogical and geochemical characteristics of the studied tonstein indicate its formation from volcanic ash of alkaline composition.

DOI: 10.1007/s11631-025-00767-w

Source: https://link.springer.com/article/10.1007/s11631-025-00767-w