WANG F F, DING Y L, LI B,et al.Enrichment and source analysis of critical elements in No.6 coal seam of the Late Permian in Northern Guizhou[J].Journal of Henan Polytechnic University(Natural Science) ,2026,45(3):143-153.

doi:10.16186/j.cnki.1673-9787.2024100015

Received:2024/10/12

Revised:2025/04/24

Published:2026/04/28

Enrichment and source analysis of critical elements in No.6 coal seam of the Late Permian in Northern Guizhou

Wang Fangfa1, Ding Yunlong1, Li Bi1, Tang Lifang1, Yang Yi1, Li Shangyuan1, Wang Xiaofang1, Zou Yinhong1, 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 The Northern Guizhou region in China is endowed with abundant coal resources and is rich in diverse critical elements. In this study， the Late Permian Longtan Formation No. 6 coal seam was selected as the research object to explore the enrichment characteristics and sources of critical elements in the coal seam.  Methods Industrial analysis，scanning electron microscopy with energy-dispersive X-ray spectroscopy（SEM-EDX），X-ray fluorescence spectrometry（XRF），and inductively coupled plasma- mass spectrometry （ICP-MS），were employed to analyze the elemental geochemistry and mineral composition of the samples to investigate the origin of critical elements in the coal.  Results The results show that Li，Th，and U in the Late Permian No.6 coal seam of Northern Guizhou are associated with clay minerals，whearas Tl may be hosted in pyrite. Ge and REY （rare earth elements and yttrium） are primarily associated with aluminosilicate minerals. The No.6 coal is enriched in Li， whereas the roof and floor， as well as the partings，are enriched in Nb and Ta. Additionally，the rare earth elements in the coal are of the light rare earth element （LREE）-enriched type.  Conclusions It is concluded that the Late Permian No.6 coal seam in Northern Guizhou is mainly enriched in Li，with the elements exhibiting a trend of gradual enrichment from west to east，primarily controlled by the terrigenous supply of weathered detritus from the Emeishan high-Ti basalt and the overlying acidic rocks， as well as the input of synsedimentary felsic volcanic ash.

Key words:critical metals;enrichment characteristics;material sources;late permian coal;Northern Guizhou