海洋地质前沿2025，Vol.41Issue(4)：4-15,12.DOI:10.16028/j.1009-2722.2024.201
红河流域不同粒级沉积物揭示的风化特征及其控制因素
Weathering characteristics in the Red River catchment and controlling factors revealed by sediments with different grain sizes
摘要
Abstract
Historically,the Red River served as the outlet to the sea for major rivers in the eastern edge of the Tibetan Plateau and is currently one of the main sources of sediment to the northern South China Sea.It is an ideal region for studying the source-sink processes and tectonic-climate-weathering relationships in the South China Sea since the uplift of the Tibetan Plateau.To understand the main controlling factors of silicate weathering in the catchment,we compared the major element characteristics and CIA(chemical index of alteration)of sediments with different grain sizes in the Red River and its tributaries,and analyzed the correlation between CIA and envir-onmental parameters regarding climate,topography,and lithology.Results indicate that coarse-grained sediments are a mixture of quartz and feldspar,and their major element content is significantly influenced by grain size ef-fects and quartz dilution effects,showing no correlation with any environmental parameters.Hence,their CIA may not accurately reflect chemical weathering.In contrast,fine-grained sediments can represent the average com-position of the upstream catchment,and their CIA primarily reflects the degree of chemical weathering in the catchment.Through the correlation analysis between the CIA of fine-grained sediments and environmental para-meters,we found that rainfall and slope are the main controlling factors on weathering in the Red River catch-ment.关键词
化学风化/红河/沉积物/CIA/粒度效应Key words
chemical weathering/Red River/sediments/CIA/grain-size effect分类
海洋科学引用本文复制引用
王是君,李超,段知非,郭玉龙,段晓勇,印萍,杨守业..红河流域不同粒级沉积物揭示的风化特征及其控制因素[J].海洋地质前沿,2025,41(4):4-15,12.基金项目
国家重点研发计划项目(2022YFF0800504) （2022YFF0800504）
国家自然科学基金(42273057,42076063) （42273057,42076063）
亚洲合作资金项目"长江三角洲与红河三角洲海洋地质环境与灾害合作研究" （）
