Several main results on the evolutions of the life and environment on early earth are summarized as follows:(1) the oxygenation of surface environment didn''t cease until a stable stage for 0.4Ga appeared after 1.6Ga;(2) compared to the isotopic compositions of kerogens and coexisted carbonates, the differences between two can effectively carrier the signals from local environments and bio-assemblages;(3) multiple isotopic relationships between kerogens and individual alkanes in Proterozoic samples were observed, which would depend on the specific biogeochemical processes;(4) repeated biogeochemical changes were observed accompanying Neoproerozoic glaciations, which suggesting that environmental rather than evolutionary forces were driving the biogeochemical changes;(5) the bio-radiations after Neoproterozoic glaciations were definitely suggested by molecular and isotopic data to be at the early Cambrian and after the middle of Doushantuo deposition with different triggers for them.

研究獲得以下重要認識：（1）古元古代地表環(huán)境的氧化可能一直持續(xù)到中元古代早期(約1.6Ga)，而在此之后的4億年里則保持相對穩(wěn)定亚洲黄色高清视频在线观看；（2）相對于傳統(tǒng)的干酪根和碳酸鹽的碳同位素組成，二者之差則能更好反映區(qū)域環(huán)境的演化特征；（3）在元古代干酪根與單體烷烴類之間存在多種碳同位素組成關系男女晚上做爽爽的视频无遮挡；而其與不同的生物地球化學過程有關；（4）全球海洋生物地球化學特征隨新元古代多次冰期出現(xiàn)循環(huán)波動国产精品大陆，這顯然為環(huán)境因子的驅動www.免费视频在线观看；（5）在新元古代大冰期之后，分子與同位素數(shù)據(jù)顯示地球生命在陡山沱中后期和早前寒武紀出現(xiàn)兩次大輻射国产乱轮性爱，然而兩次生命輻射的本質卻是不同的国产Av人人澡夜夜澡人人爽。