Mineralogy and Geochemistry of the Lower Cretaceous Coals in the Junde Mine, Hegang Coalfield, Northeastern China

Abstract

Hegang coalfield is one of the areas with abundant coal resources in Heilongjiang Province. Characteristics of minerals and geochemistry of No. 26 coal (lower Cretaceous coals) from Junde mine, Hegang coalfield, Heilongjiang province, China, were reported. The results showed that No. 26 coal of Junde mine is slightly enriched in Cs, Pb, and Zr compared with world coals. The minerals in No. 26 coal of Junde mine primarily include clay minerals and quartz, followed by calcite, siderite, pyrite, monazite, and zircon. The diagrams of Al2O3–TiO2, Zr/Sc–Th/Sc, Al2O3/TiO2–Sr/Y, and Al2O3/TiO2–La/Yb indicate that the enriched elements in No. 26 coal were mainly sourced from the Late Paleozoic meta-igneous rocks in Jiamusi block. The volcanic ash contribution to No. 26 coal seems very low. Sulfate sulfur indicating oxidation/evaporation gradually decreases during No. 26 coal formation.

Geochemistry, Mineralogy, and Coal Petrology of No. 4 Coal in Sandaoling Mine, Turpan-Hami Basin, Northwest China: Provenance and Peat Depositional Environment

“…4 coal samples. Therefore, th change in total sulfur content is attributed to the change in reducing water in this stud [41,116].…”

“…Al2O3/TiO2 ratio is appropriate for determining the source of sediments, including coal seams. Generally, when Al2O3/TiO2 > 21, the sediment source is felsic igneous rocks; when 8 < Al2O3/TiO2 < 21, the source of the sediment is intermediate igneous rocks; and when 3 < Al2O3/TiO2 < 8, the sediment source is mafic igneous rocks [41,79].…”

“…4 coal, and the lack of detailed studies on provenance and sedimentary environment limits the comprehensive understanding of ore resources in the Turpan-Hami Basin. Previous studies have shown that the maceral index should be carefully used in the study of sedimentary environments and paleoclimate [2], and numerous studies have demonstrated the efficacy of utilizing geochemistry and mineralogy to investigate provenance and sedimentary environments [1][2][3][33][34][35][36][37][38][39][40][41][42]. By combining the two methods with coal petrology and applying them to the study of No.…”

Cooperative Exploration Model of Coal–Gallium Deposit: A Case Study of the Heidaigou Coal–Gallium Deposit in the Jungar Coalfield, Inner Mongolia, China

“…Coal, as a unique sedimentary deposit, not only serves as fuel but also harbors coal-type strategic metal deposits [10][11][12]. The 2006 discovery of an exceptionally large Ga-enriched coal deposit in the Inner Mongolia Jungar Coalfield has illuminated the metallogeny of dispersed elements, such as Ga, positioning the study of coal-Ga resources at the forefront of research [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. This has led to the identification of several coal-Ga deposits ranging from medium to super-large sizes, and the Ga resource ranges from 400 to over 2000 t [30][31][32].…”

Advances in Exploration, Development and Utilization of Coal and Coal-Related Resources: An Overview

“…The Special Issue encompasses a series of research papers, which provide several representative research aspects of advances in exploration, development and utilization of coal and coal-related resources. For instance, Li et al and Wei et al discussed the geological and geochemical characterization, respectively, of coals from typical coalfields in China, with special emphasis on the strategic metal enrichment in coal [10,11]. Zhang et al investigated the distribution, occurrence, and integration of As in Permian coals in North China, and inverted influence of depositional environment on enrichment of As and other toxic elements in coal [12].…”