从晚古生代冰室到早中生代温室的气候转变:兼论东特提斯低纬区的沉积记录与响应

The Earth 's Penultimate Icehouse-to-greenhouse Climate Transition and Related Sedimentary Records in Low-latitude Regions of Eastern Tethys

地球在晚古生代晚期—中生代早期经历最近一次从冰室到温室的气候转变,是理解未来地球冰川消融、全球变暖等气候转变的重要窗口。这一时期的沉积记录和气候模型研究揭示,冰川活动、大气pCO_2和气候状态间存在复杂的耦合和反馈机制,同时伴随发生陆表植被更替和生物迁移。随冰川消融、大气pCO_2升高和全球变暖,低纬大陆区干旱化趋势和季节性降雨增强,出现季风气候并在冰室之后的三叠纪温室盛行。华南和华北是位于东特提斯低纬区的主要大陆,其石炭—二叠系在沉积和生物特征上与Pangea超大陆西侧热带区差异显著,蕴含有丰富的深时气候变化信息。基于前人成果,在简述石炭—三叠纪全球气候变化的基础上,对东特提斯低纬区石炭—三叠纪沉积记录进行总结,阐明其深时古气候研究意义和研究前景。

During the Period of Pangea in the Carboniferous-Triassic time,there occurred the Earth`s last climate transition from icehouse to greenhouse state,which provides an unique deeptime window to understand the climate impact of deglaciation and global warming in the near future.Studies on the sedimentary records of this period revealed that glaciation,atmosphere CO2 concentration and climate have complicated coupling and feedback mechanisms along with floral replacement on lands and faunal migration in oceans.Low-latitude continents became drying with seasonal precipitation corresponding with Gondwana deglaciation,atmosphere p CO2 rising and temperature increase especially in the west tropical Pangea and monsoon climate came into its acme during the Triassic when the landmass of Pangea symmetrically spreading across the equator.Both North China and South China were island land blocks in the low-latitude eastern Tethys region during the Carboniferous-Triassic era.There developed sedimentary and biological records quite different from the counterparts in the western tropical Pangea,achieving critical information for deeptime climate changes.In this contribution,we briefly review the Carboniferous-Triassic paleoclimate evolution and then discuss the related sedimentary records of North China and South China,pointing out several potential study topics for future deeptime paleoclimate research in China.