机译:最新的二叠纪古火和大气中的氧气水平:来自云南东部华南煤炭的矿物组成的证据
State Key Laboratory of Coal Resources and Safe Mining and School of Geosciences and Survey Engineering China University of Mining and Technology Beijing 100083 China;
Institute of Disaster Prevention Langfang 065201 China;
Coal Geology and Prospecting Institute of Yunnan Province Kunming 650218 China;