海洋地质与第四纪地质2024，Vol.44Issue(4)：200-211,12.DOI:10.16562/j.cnki.0256-1492.2023100101
XRF岩芯连续扫描结果的可靠性评估及校正:以青海湖沉积为例
Reliability assessment and calibration of elemental signal values by XRF core scanning in Qinghai Lake
摘要
Abstract
XRF core scanning has been extensively employed for semi-quantitative analysis of elements in various sediment types over the past three decades,particularly in lacustrine deposits due to its rapid,continuous,non-destructive,and high-resolution advantages.However,despite the susceptibility of element signal values obtained through XRF core scanning to instrument settings and core physical properties,there remains a scarcity of comprehensive evaluation regarding data reliability and calibration effects.In this study,a 2.39-m-long sedimentary core from Qinghai Hu(Lake)(QHH)was obtained for high-resolution scanning using an XRF core scanner.Physical and chemical characteristics in water content,grain size distribution,loss on ignition,and actual elemental composition were analyzed for each subsample.Moreover,the accuracy of element signal values and ratios by XRF core scanning and their influencing factors was effectively assessed,and the reliability of calibration results was simultaneously calibrated using internationally recognized models such as Normalized Median-scaled Calibration and Multivariate Log-ratio Calibration(MLC).Results demonstrate that the Zr signal values corresponded accurately to the actual contents in the sediment core sequence,while weak correlations were observed for Si and Ti,indicating their limited significance.Additionally,the presence of higher water content in the core sections significantly attenuated in signal intensity and fluctuation amplitude for elements of Al,Si,K,Ca,Ti,Fe and Mn.Reversely,dry core sections exhibited greater fluctuations in signals of above elements due to high-resolution scanning and variations in particle composition,thereby attenuating their correlations with actual concentrations.Trace elements of higher atomic weights,such as Rb,Sr,and Zr,demonstrated reduced susceptibility to the variations in water content and particle composition in terms of signal distributions.Finally,using the ratio between adjacent elements based on the XRF core scanning was proven a highly effective approach for quickly eliminating the consistent influence of multiple factors.Furthermore,the multivariate log-ratio calibration(MLC)model exhibited superior calibration effects on individual element signal values throughout the QHH core and within each core section.These findings not only offered valuable reference to the scientific application of high-resolution data acquired by XRF core scanning for lake sediments,but also established a foundation for the reconstruction of climate change and for comprehension of human-environment relationships in the northeastern Tibetan Plateau.关键词
XRF岩芯连续扫描/元素比值/校正模型/湖泊沉积/青海湖Key words
XRF core scanning/element ratio/calibration model/lacustrine deposit/Qinghai Lake分类
天文与地球科学引用本文复制引用
张航瑜,王夏青,黄平安,万的军,刘峰贵,唐湘玲,周科翰..XRF岩芯连续扫描结果的可靠性评估及校正:以青海湖沉积为例[J].海洋地质与第四纪地质,2024,44(4):200-211,12.基金项目
青海省自然科学基金项目"布哈河流域沉积物DNA的埋藏过程及其记录的近2000年人地关系演变"(2022-ZJ-920) （2022-ZJ-920）
国家自然科学基金项目"黄土高原湫沟沉积物DNA记录的近500年农牧活动与环境间交互胁迫和适应"(42167062) （42167062）
湖南省教育厅科学研究优秀青年项目(21B0611,22B0697) （21B0611,22B0697）
湖南文理学院博士科研启动基金项目(22BSQD08,22BSQD14) （22BSQD08,22BSQD14）
地理学应用特色学科资金(湘教通[2022]351号) （湘教通[2022]351号）
