Temperature variability and paleo-ecological changes during the Cenomanian-Turonian Supergreenhouse

在塞诺马尼亚-图罗尼亚时期(约100-89 Ma)，地球经历了异常温暖的气候模式，这意味着在那段时间里地球是一个无冰的世界。相反，同期全球海平面变化的记录显示出巨大的波动，据我们目前的理解，这种波动只能由冰盖的消长引起。本研究方案旨在研究这一争议。中心研究目标是超级温室气候对生命的古生态影响(物种进化和灭绝)。在关于海平面变化的持续时间、速度和幅度的四个主要研究问题中，将使用坦桑尼亚钻探活动中保存极为完好的独特材料来研究古温度变化和生物圈变化。这些剖面代表了南特提斯洋第一个完整且保存完好的塞诺曼人/图罗尼亚人的记录。以有孔虫古生物学、稳定同位素分析和碳酸盐沉积学测量为核心的多指标地学工具是本次研究的核心。古生物标本的不同寻常的保存有可能提供非常可靠的高时间分辨率的古温度记录。此外，保存异常完好的形态细节为一些钙质微化石的详细分类学研究提供了前所未有的机会。

During the Cenomanian-Turonian time interval (~100-89 Ma) Earth experienced unusually warm climate modes suggesting an ice-free world during that time. On the contrary, the record of global sea level change during the same time shows huge fluctuations that can, to our current understanding, only be induced by the waxing and waning of ice sheets. This research proposal aims at studying this controversy. The central research target is the paleo-ecological impact of a Supergreenhouse climate on life (species evolution and extinction). In four major research questions regarding the duration, rates and magnitude of sea level change, paleo-temperature variations and biosphere changes will be investigated using unique, exceptionally well-preserved material from the Tanzania Drilling campaign. These sections represent the first complete and well-preserved record of the Cenomanian/Turonian in the Southern Tethys Ocean. The multi-proxy geoscientific tools central to this study are foraminiferal paleontology and stable isotope analysis combined with carbonate sedimentological measurements. The unusual preservation of the paleontological specimens has the potential to provide an exceptionally reliable paleo-temperature record at high temporal resolution. Furthermore, unusually well preserved morphological details enable unprecedented opportunity for detailed taxonomic studies of some calcareous microfossils.