地质与资源2026，Vol.35Issue(1)：27-37,11.DOI:10.13686/j.cnki.dzyzy.2026.01.003
苏北滨海平原沉积物粒度组成及古气候指示
Grain-size components of sediments in the Northern Jiangsu Coastal Plain and its paleoclimatic implications
摘要
Abstract
The analysis of sediment grain-size characteristics enables the interpretation of sediment provenance,depositional environments,and paleoclimatic records.This study examines sensitive grain-size components indicative of paleoclimatic variations and associated climatic evolution through the analysis of grain-size composition in sediments from borehole JS1,located in the Northern Jiangsu Coastal Plain and dating from the late Middle Pleistocene onward,using principal component analysis,frequency distribution curves,and the Sahu discrimination method.The results show that the sediments are predominantly governed by two principal factors:grain-size components 0.178-17.18 μm(F11)and 18.86-39.78 μm(F3).Variations in F3 content exhibit cyclicity consistent with glacial/interglacial rhythms,reflecting broad global climate patterns.The vertical distribution profile of F11 closely matches the paleomagnetic record from Zhenjiang,supporting its use as a proxy for East Asian Summer Monsoon intensity.A comparative analysis reveals that the distribution curves of the sensitive components F11 and F3 record two major winter monsoon events during the MIS 7 and MIS 5 interglacials,as well as one pronounced East Asian Summer Monsoon event during MIS 3.Moreover,Mann-Kendall abrupt change-point analysis identifies two significant climatic shifts:an abrupt intensification of the East Asian Summer Monsoon around 34 ka and a marked transition to a warmer climate at approximately 4.3 ka.关键词
沉积环境/敏感粒度组分/古气候/季风事件/Mann-Kendall检验/滨海平原/江苏省Key words
sedimentary environment/sensitive grain-size component/paleoclimate/monsoon event/Mann-Kendall test/the Coastal Plain/Jiangsu Province分类
天文与地球科学引用本文复制引用
李芳梨,葛勤..苏北滨海平原沉积物粒度组成及古气候指示[J].地质与资源,2026,35(1):27-37,11.基金项目
国家自然科学基金项目"有机质对弱透水层中铀活化迁移的作用机理研究"(42202288) （42202288）
中国中铁股份公司课题"江西流域综合治理技术研究"(2021-重大-08). （2021-重大-08）
