摘要
通过对武汉东西湖区典型第四纪钻孔ZK02孔沉积物的粒度特征分析,重建了武汉东西湖区第四纪以来的沉积环境演变过程。结果显示,该区早更新世时期为河流相的沉积环境;中更新世—晚更新世晚期,为河湖交替相的沉积环境;全新世早期—全新世中期,为开阔的河流相沉积环境;全新世中期以来,整体处于湖泊沼泽相的沉积环境。区域上地层对比还显示该区全新世地层沉积厚达50 m,可能是晚更新世晚期全球气温骤降,海平面急剧下降导致汉江水系下切侵蚀后快速堆积形成的,沉积记录显示末次冰盛期该区存在最深海拔达-22 m的深切河槽现象。
Through analyzing grain size characteristics of the typical quaternary core sediments in Dongxihu District, Wuban, the paper rebuilt the sedimentary environment evolution process since the Quaternary. The results showed that Dongxihu District was a river phase sedimentary environment in the early Pleistocene, a river-lake facies sedimentary en- vironment in Middle Pleistocene to late Pleistocene. Early Holocene to Middle Holocene was a open fiver facies sedimentary environment, overall in the lacustrine swamp facies sedimentary environment since Middle Holocene. Regional stratigraphic correlation also showed the Holocene sedimentary thickness was not less than 50 meters, which was probably affected by global drop in temperatures during late stage of late Pleistocene, and sea level sharply dropped caused the Han River down-cutting and sediments accumulated rapidly. Sedimentary records showed that the fiver depth reached an alti- tude of -22 meters belowthe in last glacial maximum period.
出处
《资源环境与工程》
2015年第3期259-266,共8页
Resources Environment & Engineering
关键词
ZK02钻孔
第四纪
粒度
沉积环境
武汉
ZK02 core
Quaternary
grain size
sedimentary environment
Wuhan
