The pyrite morphology and distribution in tectonically deformed coal（TDC）were observed by electron microscope（EM）and scanning electron microscope（SEM）, combined with structural distribution constants and associated elements in coal, the distribution of pyrite and its tectonic control was discussed. The formation mechanism of pyrite in TDC is the result of the sedimentary environments and tectonic stress, according to the pyrite morphology the formation can be divided into 4 stages, 12 types, and the pyrite forms are closed to the stress-strain conditions. We further find that there is good correlation between mercury（Hg）and sulfur in pyrite sulfur（Sp.d）, the Hg concentration presents a high-low-high temporal changing pattern with the increase of the degree of TDC deformation, which influenced by tectonic coal formation mechanism. Formation mechanism of pyrite in TDC can be divided into two modes: syngenetic mode and epigenetic mode. The former was controlled by sedimentary environments and tectonic conditions, and the latter was related to structural reworking and TDC deformation. We conclude that physical change process provides the occurrence space and conditions of pyrite in brittle deformation stage, and dynamic metamorphism and mechanochemical provides the motivation for the redistribution（include migration, disperse and aggregation）of elements, all that influence the formation of pyrite type and distribution in TDC.
Li Yunbo Jiang Bo Qu Zhenghui . Pyrite occurrence characteristics and geological control in tectonically deformed coal from the Linsu mining area，Huaibei coalfield，China[J]. Chinese Journal of Geology, 2017, 52(3): 855-870.