人力培训东亚地区松辽盆地和美洲大陆北美西部海道的晚白垩纪气候变化记录
Late Cretaceous climate changes recorded in Eastern Asian lacustrine deposits and North American Epieric a strata
：Cretaceous climate data of the long-lived Cretaceous Songliao Basin （SB） in eastern Asia is correlated and compared with the Western Interior Seaway （WIS） on the northern American plate， in order to understand better the dynamics of the Earth's past ‘greenhou’ climates. Nearly continuous Late Cretaceous terrestrial deposition in the Songliao Basin is reprented by two cores totaling 2431 m in length. The Turonian?CMaastrichtian age of the ction is bad on integrated stratigraphy， and is comparable in agewith Upper Cretaceous strata in the WIS. Being consistent with global trends， the dynamic Late Cretaceous climates of both the SB and WIS gradually cooled from the warmest Albian?CCenomanian time to the end of the Maastrichtian with veral intervening warm periods as did the global climate. However regional differences existed，the Songliao Basin climate was humid to mi-humid， warmdeactivate
temperate?Csubtropical and the Western Interior Seaway was in the humid， warm temperate zone and experienced only moderate climatic changes. The shifts of oxygen isotope data in the Songliao Ba
sin were frequent and abrupt，whereas WIS records more gradual change affected mainly by fresh-water runoff mixingwith southern Tethyan and northern Arcticwaters. Sedimentary cycles of eccentricity， obliquity and precession bands are recorded in both the SB and WIS basins. The dimentary cycles in the WIS and SB are interpreted to be related to variations of the wet/dry runoff cycles， which indicate that orbital forcing played an important role in global climate change in Late Cretaceous. The most favorable condition for organic carbon burial in both the SB and WIS basin was bottom water anoxia regardless of the cau of the anoxia. But the organic carbon burial rate was usually much higher in the Songliao Lake than in the WI epeiric a suggesting that giant lakes may rve as important sinks of atmospheric CO2. In both basins organic-rich deposits formed during a ri in water level and incursion of saline waters. The integration of paleoclimate data from Cretaceous marine deposits and terrestrial dimentary
qbs
record will promote our understanding of the Cretaceous ‘greenhou’climate change and may provide insights for a future greenhou world.
worldKeywords：Late Cretaceous；Paleoclimate；Western Interior Seaway；Songliao Basin；Correlation of terrestrial and marine deposits；Greenhou world
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