海洋地质与第四纪地质2025，Vol.45Issue(6)：163-172,10.DOI:10.16562/j.cnki.0256-1492.2025031801
基于HR-Peeper的海底冷泉沉积物高分辨孔隙水地球化学特征研究
High-resolution pore-water geochemical characteristics of cold seep sediments based on HR-Peeper
摘要
Abstract
The physicochemical properties of cold seep sedimentary environments are highly dynamic;studying their biogeochemical processes is crucial for understanding the environmental impact of methane seepage.Using the"Shenhaiyongshi"manned submersible,we collected push-core sediment samples from the Haima cold seep in the Qiongdongnan Basin,South China Sea,and compared the applicability of HR-Peeper and traditional Rhizon methods in pore-water sampling.Results demonstrate that HR-Peeper enables precise millimeter-scale(5 mm)resolution measurements of key parameters,including anion and cation concentrations,dissolved inorganic carbon(DIC)concentrations,and carbon isotope compositions.This method provided a clearer depiction of elemental fluxes and the transformation of authigenic carbonate mineral phases in cold seep environments.Compared to the Rhizon method,the HR-Peeper exhibited superior resolution and accuracy in characterizing sulfate-driven anaerobic oxidation of methane(SD-AOM)and carbonate precipitation mechanisms.In addition,we found that carbonate minerals precipitated primarily as aragonite in surface sediments and the aragonite transitioned to high-magnesium calcite at greater depths,which was clearly observed in the vertical profiles of calcium,magnesium,and strontium ion concentrations.The HR-Peeper showed significant advantages in high-resolution pore-water studies,offering a reliable technique for evaluating element fluxes at the sediment-water interface,tracing carbon sources,and investigating authigenic carbonate systems.These findings contribute to a deeper understanding of the biogeochemical processes associated with submarine methane seepage.关键词
甲烷厌氧氧化/水合物/孔隙水/自生碳酸盐岩/"海马"冷泉Key words
anaerobic oxidation of methane/hydrate/pore-water/authigenic carbonate/Haima seep分类
海洋科学引用本文复制引用
FENG Dewei,GONG Shanggui,JIANG Xinyu,FENG Dong..基于HR-Peeper的海底冷泉沉积物高分辨孔隙水地球化学特征研究[J].海洋地质与第四纪地质,2025,45(6):163-172,10.基金项目
国家自然科学基金项目"海底冷泉沉积地球化学"(42225603),"海底冷泉自生碳酸盐沉淀速率对钙锶稳定同位素分馏的影响及其地质记录"(42476069) （42225603）
