二叠纪末生物大灭绝和环境变化是地质历史时期规模最大、影响最深刻的地质事件，对这次生物事件和其后生物复苏过程及其环境背景的研究是深入认识地球生命系统、揭示地球环境与生命过程作用机理的一个重要窗口。通过对浙江煤山晚二叠世长兴期和早三叠世印度期新鲜连续的钻探岩芯样品，测试类胡萝卜素、C26-30甾烷和2-甲基藿烷等用来判定光合作用和透光带硫化的烃类生物标志化合物；C20+无环类异戊二烯、3-甲基藿烷和中支链烷烃的丰度及稳定同位素，来分析这一时期的沉积物中是否存在甲烷循环细菌、有氧甲烷菌包括硫酸盐还原菌的硫循环细菌。同时对这些岩芯进行Mo同位素辅助研究，利用δ98/95Mo等指标，研究长兴期-印度期的古海洋氧化还原条件。以古海洋环境为依据，结合高分辨率精细沉积学和高分辨率生物地层学研究，探讨长兴期- - 印度期生物与环境的协同演化。

The end-Permian mass extinction and associated dramatic environmental changes have been ranked unanimously as the largest geological event during the earth hitory. Study of this event and subsequent recovery, and its palaeoenvironmental background has become an important window to unravel the co-evolution of the life and environment in critical transitions.In this project, we will use the Changhsingian and Induan drill core samples previously drilled at Meishan, South China and employ new isolation methodology (extract #2) to measure abundances and stable isotopic compositions of C20+ acyclic isoprenoids (methane-cycle archaea), 3-methylhopanes (aerobic methanotrophs) and mid-chain branched alkanes (sulfur cycle bacteria including sulfate reducing bacteria). Hydrocarbons diagnostic for phototrophs and euxinic environment such as carotenoids (diverse phototrophs), C26-30 steranes (algae), 2-methylhopanes (cyanobacteria) will be measured as well. In addition, one new redox proxy, molybdenum isotope, will be analyzed to investigate the paleoenvironmental background during the end-Permian mass extinction and Early Triassic recovery. Combined with high-resolution sedimentological studies and high-resolution biostratigraphical and geochronologic calibrations from Late Permian to Early Triassic, this study will provide more new understanding of the paleoenvironmental conditions of the critical transition around the Paleozoic and Mesozoic transitions.