The coal-forming environment during mass extinction in the latest permian: Evidence from geochemistry of rare Earth elements

The C 1 coal of Latest Permian during mass extinction in eastern Yunnan was studied to reveal the terrestrial paleoenvironment and influence geological events on coal-formation extinction. An analysis Rare Earth Elements (REEs) conducted from Yantang Mine Xuanwei, Province, which deposited latest Permian. A total 24 samples coals, partings, roofs floors were taken fresh face underground mine. results REEs indicated that REE content (∑REE) varies 23.99 μg/g 267.94 μg/g, averaged 122.69 μg/g. is enriched light (LREE) relative heavy (HREE), signifying fractionation between LREE HREE. Most seam are depleted Eu various degrees slightly Ce, especially two partings sub-seams B 3 show significant negative anomalies. geochemical characteristics a weak oxidation environment; sedimentary environment turbulent middle-later stage coal-forming process; affected by basalt clastic materials Khangdian Oldland acidic synsedimentary volcanic ash period. Tonsteins similar those marine Permian-Triassic boundary (PTB) layers South China, both derived felsic volcanism caused closure Paleo-Tethys at southwestern margin China. Furthermore, also eruption Siberian large igneous province (SLIP) early stage.