摘要
通过对渤海西部海区TJC孔55.34m以浅地层岩性、测年及孢粉分析等研究,发现该海域晚更新世MIS 5以来的孢粉组合呈现针叶-阔叶-草本规律的旋回性变化,此特征变化是植被-气候-海平面共同作用的结果,气候暖湿、干(凉)冷交替频繁,海平面波动显著。MIS 5e、MIS 5c、MIS 5a、MIS 3及MIS 1(中全新世)阶段气候温暖湿润,陆区则发育针阔叶混交林或落叶阔叶混交林植被,近岸分布有湖沼植被和盐生草地,整体属于高海平面时期的滨海或滨岸浅海环境。MIS 2冰盛期沉积较薄,MIS 5d、MIS 5b、MIS 4和MIS 2阶段,气候偏冷(凉),以草本蒿和藜为主,陆区发育森林草地或针阔叶混交林草地,海平面较低。
The comprehensive study of the upper 55.34 m of core TJC-1 taken from the western Bohai area on sediment lithology,multi-method dating and high resolution spore-pollen data suggests that the changes in pollen assemblage since late Pleistocene are resulted from the joint effects of vegetation,climate and sea-level changes.Conifers,broad-leaved trees and herbs show a regular and cyclic pattern of variation,which indicates a frequent alternation of warm-wet and cold(cool)dry climatic conditions,in addition to significant sea level fluctuation.During the periods of MIS5 e,MIS5 c,MIS5 a,MIS3 and MIS1(early-middle Holocene),mixed coniferous or deciduous broad-leaved forest were developed in the surrounding upland,and lacustrine-halobiotic grass prevailed on the coastal lowland in warm-wet conditions,indicating a coastal or shallow sea environment.There is a thin layer of LGM deposits in MIS2.During the periods of MIS5 d,MIS5 b,MIS4,and MIS2,conifers prevailed on the upland,and Artemisia-Chenopodiaceae dominated herbs in the lowland area under a cold(cool)-dry climate and low sea level.
作者
李杰
李日辉
杨士雄
陈晓辉
陈珊珊
LI Jie;LI Rihui;YANG Shixiong;CHEN Xiaohui;CHEN Shanshan(Key Laboratory of Marine Hydrocarbon Resource and Environment Geology, Qingdao Institute of Marine Geology, Qingdao 266071, China)
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
2018年第2期115-128,共14页
Marine Geology & Quaternary Geology
基金
国家自然科学青年基金"根据现代孢粉传播机制探讨辽东湾北部海域全新世物质来源及陆缘植被变化"(41506062)
国家自然科学青年基金"南黄海中部泥质区高分辨率全新世孢粉记录的环境变化"(41406069)
国土资源部海洋地质调查专项(GZH201200503
GZH201400205)
关键词
孢粉
古环境变化
晚更新世
渤海西部
pollen and spore, palaeoenvironment
late Pleistocene
western Bohai Sea