海洋地质与第四纪地质2026，Vol.46Issue(4)：14-26,13.DOI:10.16562/j.cnki.0256-1492.2025040101
MIS5以来东海内陆架泥质区环境变化
Environmental changes in the mud area of the inner shelf of the East China Sea since MIS 5:Evidence from biomarkers
摘要
Abstract
Glycerol dialkyl glycerol tetraethers(GDGTs),an emerging class of biomarkers,have been widely applied in studies of marginal sea sedimentary records and environmental evolution due to their significant advantages in indicating the sources of organic matter,reconstructing sea surface temperature(SST)during geological periods,and reflecting environmental responses to variations in material input.However,the relatively high sedimentation rates in the mud area of the inner shelf of the East China Sea limit long-term investigations of environmentally sensitive muddy sedimentary records.In this study,the ECS1601 core,located at the southern end of the mud area on the inner shelf of the East China Sea,was selected as the research object.By integrating lithological characteristics,stratigraphic chronology,grain-size parameters,and GDGT-related indices,the evolution of the sedimentary environment in this muddy area since Marine Isotope Stage 5(MIS 5)was investigated.Results show that since MIS 5,the relative contributions of terrestrial and marine organic matter in the study area have been mainly controlled by sea-level fluctuations.During periods of high sea level,the proportion of marine-derived organic matter increased.Meanwhile,the sources of organic matter were also jointly influenced by hydrodynamic conditions driven by the East Asian monsoon and environmental changes within the drainage basin.During the MIS 4,the mean SST fluctuated from 16.38 to 26.66 ℃,and the SST exhibited relatively large variability influenced by multiple end-member sources,whereas the SST fluctuations in other stages were comparatively moderate.Meanwhile,the relationship between organic matter composition and the sedimentary environment in the mud area over a long-term timescale(since MIS 5)was also revealed.Our findings provided important evidence for understanding the geological history of the region and global environmental change,and contributed new data to related global comparative studies.关键词
沉积记录/甘油二烷基甘油四醚 GDGTs/环境变化/东海泥质区Key words
sedimentary record/glycerol dialkyl glycerol tetraethers(GDGTs)/environmental change/mud area of the East China Sea分类
海洋科学引用本文复制引用
祝文君,胡刚,李琦,孙成鹏..MIS5以来东海内陆架泥质区环境变化[J].海洋地质与第四纪地质,2026,46(4):14-26,13.基金项目
国家自然科学基金"东海陆架晚更新世强制海退三角洲前积层记录及演化"(42476058) （42476058）
中国地质调查局项目(DD20242759) （DD20242759）
