Abstract
Pyrite, a mineral that can cause potential environmental issues in coal mining, is commonly found in coal seams around intrusions. In this paper, pyrites from the Yuandian Coal Mine (Huaibei Coalfield, Anhui, Eastern China) were studied using SEM, Raman and LA-ICP-MS. The pyrite morphologic and geochemical data suggest that (1) four pyrite generations are present (framboidal sedimentary pyrites (Py I) in the original coal, coarse-grained magmatic pyrites (Py II) in the intruding diabase, fine-grained metamorphic pyrites (Py III) in the intrusive contact aureole, and spheroid/vein hydrothermal pyrites (Py IV) in the cokeite); and (2) concentrations of cobalt, nickel, arsenic, selenium, lead and copper in the metamorphic pyrites are much higher than the other pyrite generations. We propose that mafic magmatism is the main contributor of the toxic elements to the intrusion-related cokeite at Yuandian.
Highlights
IntroductionThe thermal metamorphism in coal seams around intrusions has received increasing attention in recent years [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16], with studies dedicated mainly to intrusion-related cokeite [17,18,19], gas outbursts [20,21,22], geochemical components (especially toxic metals) and anomalies [23,24,25,26,27,28,29,30,31,32,33,34,35]
Some authors suggested that metamorphism/metasomatism could not affect immobile elements such as rare earth elements (REEs) [27,28,29,30,38]
Spherical pyrite aggregates mainly filled in the pores of cokeite and encapsulated a large number of mesocarbon microbeads (MCMB) (Figure 3h)
Summary
The thermal metamorphism in coal seams around intrusions has received increasing attention in recent years [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16], with studies dedicated mainly to intrusion-related cokeite [17,18,19], gas outbursts [20,21,22], geochemical components (especially toxic metals) and anomalies [23,24,25,26,27,28,29,30,31,32,33,34,35]. Pyrite occurs in different rock types in the mine (coal seams, magmatic intrusions and the contact metamorphic aureole between them), allowing systematic mineral geochemical comparison
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