古近纪气候变化在东海盆地内的化石记录

古近纪气候演化经历了由"温室气候"向"温凉气候"转变的过程,在此期间发生了三次显著的气候事件,分别为PETM极热事件、Oi-L骤冷事件和Mi-L降温事件。利用东海陆架盆地内孢粉、有孔虫等古生物资料探讨了全球古气候变化背景下东海陆架盆地内古生物差异性变化,并根据特征孢粉组合恢复东海陆架盆地内不同时期古植被以及古气候,在此基础上将东海陆架盆地温度、湿度变化曲线与全球温度变化曲线、海平面变化作对比分析,结果显示东海陆架盆地气候演变与全球气候变化具有一定的耦合关系,并且对渐新世时期东海陆架盆地气候变化的原因进行了初步探讨,认为渐新世时期季风气候的形成导致了东海陆架盆地花港组整体呈现湿润的气候特征。

Sedimentary Response to Paleoclimate Change in the East China Sea Shelf Basin

The climate evolution of the Paleogene experienced changing from "greenhouse climate" to "ice chamber climate". During this period, three significant climate events occurred:the PETM event, the Oi-L event and the Mi-L event. Using pollen and foraminifera data, we discuss the ancient biological differences in the East China Sea Shelf Basin based on the global palaeoclimate. According to the characteristics of the pollen assemblage with the monsoon climate formed in the Oligocene, we restore the ancient plant and climate patterns in the East China Sea Shelf Basin. Based on this, a comparison was carried out on the temperature and humidity changes in the East China Sea Shelf Basin, with special references to global temperature and sea level changes. We suggest that a certain coupling relationship exists between the climate changes in the East China Sea Shelf Basin and global sea level change, which helps us better understand climate change in the East China Sea Shelf Basin during the Oligocene. The formation of the monsoon climate during the Oligocene led to the humid climate characteristics of the Huagang Formation in the East China Sea Shelf Basin.