WANG F F, DING Y L, LI B, et al． Enrichment and source analysis of critical elements in No.6 coal seam from Late Permian in Northern Guizhou Province [J]. Journal of Henan Polytechnic University( Natural Science) ， doi: 10.16186/j.cnki.1673-9787. 2024100015.

doi: 10.16186/j.cnki.1673-9787.2024100015

Received： 2024-10-12

Revised： 2025-04-24

Online： 2025-12-12

Enrichment and source analysis of critical elements in No.6 coal seam from Late Permian in Northern Guizhou Province (Online)

WANG Fangfa1，DING Yunlon1，LI Bi1，TANG Lifang1，YANG Yi1，LI Shangyuan1，WANG Xiaofang1，ZOU Yinhon1，SONG Yu2

1. 142 Team，Coal Mine Exploration Bureau of Guizhou Province，Guiyang 550000，Guizhou，China；2.School of Resources and Geosciences，China University of Mining & Technology，Xuzhou 221116，Jiangsu，China

Abstract: Objectives With the advancement of industrial development and industrial innovation, the demand for critical elements minerals is escalating. Coal-associated metals represent a potential source of critical elements and constitute one of the main directions in mineral exploration. The region around the Northern Guizhou Province in China is endowed with abundant coal resources and is rich in diverse critical elements. This research selected the Late Permian Longtan Formation No. 6 coal seam in the Northern Guizhou Province as the research object, with the aim of exploring the enrichment characteristics and sources of critical elements in the coal seam. Methods By employing industrial analysis, scanning electron microscope energy dispersive X-ray spectroscopy (SEM-EDX), X-ray fluorescence spectrometry (XRF), and inductively coupled plasma-mass spectrometry (ICP-MS), the study analyzed the elemental geochemistry and mineral composition of the samples to investigate the origin of critical elements in the coal. Results The results indicated that the Li, Th, and U elements in the Late Permian No. 6 coal seam of Qianbei are associated with clay minerals, while Tl may be present in pyrite. Ge and REY elements are primarily associated with aluminosilicate minerals. The No. 6 coal is enriched with lithium (Li), while the top and bottom plates, as well as the gangue, are enriched with niobium (Nb) and tantalum (Ta). Additionally, the rare earth elements present in the coal are of the light rare earth enriched type. Conclusions The conclusion drawn is that the Late Permian No. 6 coal seam in the Northern Guizhou  Province is mainly enriched in Li, and the elements exhibit a trend of gradual enrichment from west to east, mainly influenced by the weathering and fragmentation of the Emeishan high-titanite basalt of the Kangzhou Craton and the top acidic rocks, as well as the input of felsic volcanic ash.

Key words: critical elements；enrichment characteristics；material sources；late permian coal；the Northern Guizhou Province