利用广州地区南北2个不同沉积地貌区的钻孔进行孢粉分析,结合测年和沉积信息,分析了广州所代表的珠江三角洲地区晚更新世以来的沉积环境和气候变化。孢粉分析结果显示:在晚更新世珠江三角洲地区气候经历了偏冷干-偏凉干-暖湿-热湿-偏凉干-冷干的变化过程,末次冰期对本区具有明显影响,使全新世和晚更新世孢粉组合表现出一定的差异;全新世气候明显转暖湿,整体上以暖湿为主,但出现了一些小的气候波动事件,最明显的是在2 250 a BP 前后偏凉干的变化;该区在晚更新世和全新世各经历过一次海侵
combined with the informations on dating and sedimentation of two drilling cores located at different depositiongeomorphological area in the northern and southern part of Guangzhou
the deposition environmental and climatic changes since the late Pleistocene in Guangzhou
the Pearl River Delta
are suggested. Pollen records show that the climate during the late Pleistocene changed as below: partially drycold
slightly cooldry
warmhumid
hotmoisture below
partially cooldry
colddry. The obvious influence from the Last Maximum Glaciation resulted in the difference of pollen assemblage characteristics between the Holocene and the late Pleistocene. The climate became generally warm and humid in the Holocene
but being alterated with some minor climatic fluctuation events
eg. the most obvious partial drycool transition around 2250a BP. Two transgressions have affected the delta during the late Pleistocene and the Holocene. Not only the variations of climatic and sealevel changes of two cores are consistent each other
but also a good correspondence between climate and sealevel change is shown. The differences on stratigraphy
sedimentary facies and pollen characteristics of two cores were resulted from the distinctive location
sedimentary environment and the topography of depositional bed.〗
关键词
古气候孢粉沉积晚第四纪珠江三角洲
Keywords
paleoclimatepollensedimentationLate Quaternarythe Pearl River Delta