X-射线岩心扫描系统对海洋沉积物成分测定质量的综合评价和校正
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摘要
基于采自东海内陆架泥质区的沉积物岩心,利用X-射线岩心扫描系统对其进行高分辨成分扫描,同时利用台式偏振X射线荧光光谱仪对该岩心进行元素测定,通过对比研究评价了X-射线岩心扫描系统元素扫描分析质量。研究表明:(1)X-射线岩心扫描系统对海洋沉积物元素分析质量可以分为四类,Ⅰ类元素分析结果可信度高、可以直接作为含量对待,Ⅱ类具有重要的参考价值,Ⅲ类具有一定参考价值,而Ⅳ类无参考价值。(2)海洋沉积物的X-射线岩心扫描元素分析受到压实作用的影响,其中钙、铁、钾、钛、硅等5种元素压实效应明显,通过压实校正可以有效消除压实作用造成的元素垂向上的系统波动。(3)对钙、铁、钾、钛、硅等5种元素,X-射线岩心扫描强度与传统的XRF元素含量之间具有良好的线性关系,相关系数在0.47~0.87,可以据此进行扫描强度和元素含量的换算。
Based on Core C0702 in the East China Sea mud area,an elemental analysis quality was appraised by comparing the results of two analysis methods,which are an X-ray fluorescence core scanner(X-ray core scanner)and an X-ray fluorescence spectrometer(XRF).The results show that:(1) The elements detected by the X-ray core scanner can be divided into four classes.Elements in ClassⅠshow a high detecting quality,and the intensities of these elemente measured by the X-ray core scanner can be taken as contents directly.The measuring intensities of elements in ClassⅡare great significance,and those in ClassⅢare small significance.However,the measured intensities of elements in ClassⅣare worthless and minor significant.(2) The analysis results of element itensities in marine sediments detected by the X-ray core scanner affected by compaction,especially,Ca,Fe,K,Ti,Si are more vulnerable.A formula for eliminating this effect via calibration is proposed.(3) The measuring results of Ca,Fe,K,Si,Ti detected by the two methods show a good linear relationship(with correlation coefficients of 0.46-0.87),so the element intensities of Ca,Fe,K,Si,Ti detected by the X-ray core scanner could be converted into the chemical content according to the relationship.
Based on Core C0702 in the East China Sea mud area,an elemental analysis quality was appraised by comparing the results of two analysis methods,which are an X-ray fluorescence core scanner(X-ray core scanner)and an X-ray fluorescence spectrometer(XRF).The results show that:(1) The elements detected by the X-ray core scanner can be divided into four classes.Elements in ClassⅠshow a high detecting quality,and the intensities of these elemente measured by the X-ray core scanner can be taken as contents directly.The measuring intensities of elements in ClassⅡare great significance,and those in ClassⅢare small significance.However,the measured intensities of elements in ClassⅣare worthless and minor significant.(2) The analysis results of element itensities in marine sediments detected by the X-ray core scanner affected by compaction,especially,Ca,Fe,K,Ti,Si are more vulnerable.A formula for eliminating this effect via calibration is proposed.(3) The measuring results of Ca,Fe,K,Si,Ti detected by the two methods show a good linear relationship(with correlation coefficients of 0.46-0.87),so the element intensities of Ca,Fe,K,Si,Ti detected by the X-ray core scanner could be converted into the chemical content according to the relationship.
引文
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[2]汪品先,翦知湣.寻求高分辨率的古环境记录[J].第四纪研究,1999(1):1-17.
[3]Croudace I W,Williams-Thorpe O.A low dilution,wavelength-dispersive X-ray fluorescence procedure for the analysis of archaeological rock artefacts[J].Archaeometry,1988,30:227-236.
[4]Croudace I W,Rindby Anders,Rothwell R Guy.ITRAX:description and evaluation of a new multi-function X-ray core scanner[M]∥Rothwell R G.New Techniques in Sediment Core Analysis:Special Publications.Geological Society,London,2006:51-63.
[5]Jenkins R.X-Ray Fluorescence Spectrometry[M].2nd Chichester:Wiley,1999.
[6]Kido Y,Koshikawa T,Tada R.Rapid and quantitative major element ananlysis method for wet fine-grained sediments using an XRF microscanner[J].Marine Geology,2006,229(3/4):209-225.
[7]Rothwell R G,Rack F R.New techniques in sediment core analysis:an introduction[J].Geological Society,London,Special Publications,2006,267(1):1-29.
[8]Kujau A,Nurnberg D,Zielhofer C.Mississippi River discharge over the last~560 000years-Indications from X-ray fluorescence core-scanning[J].Palaeogeography,Palaeoclimatology,Palaeoecology,2010,298:311-318.
[9]Kylander M E,Ampel L,Wohlfarth B,et al.High-resolution X-ray fluorescence core scanning analysis of Les Echets(France)sedimentary sequence:new insights from chemical proxies[J].Journal of Quaternary Science,2011,26(1):109-117.
[10]杨文光,郑洪波,王可,等.南海东北部MD05-2905站36ka BP以来的陆源碎屑沉积特征与东亚季风的演化[J].地球科学进展,2007(10):1012-1018.
[11]梅西,张训华,郑洪波,等.南海南部120ka以来元素地球化学记录的东亚夏季风变迁[J].矿物岩石地球化学通报,2010,29(2):134-141.
[12]雷国良,张虎才,常凤琴,等.湖泊沉积物XRF元素连续扫描与常规ICP-OES分析结果的对比及校正———以兹格塘错为例[J].湖泊科学,2011,23(2):287-294.
[13]Liang L J,Sun Y B,Yao Z Q.Evaluation of high-resolution elemental analyses of Chinese loess deposits measured by X-ray fluorescence core scanner[J].Catena,2012(92):75-82.
[16]李国会,马光祖,罗立强,等.X射线荧光光谱分析中不同价态硫对测定硫的影响及地质试样中全硫的测定[J].岩矿测试,1994,13(4):264-268.
[17]Zavarin M,Doner H E.Interpretation of heterogeneilty effects in synchrotron X-ray fluorescence microprobe date[J].Geochem Trans,2002,3(7):51-55.
[18]Tjallingii R,Rohl U,KOLLING M,et al.Influence of the water content on X-ray fluorescence core-scanning measurement in soft marine sediment[J].Geochem,Geophys,Geosysr,2007,2(8):2-3.
[19]Weltje G J,Tjallingii R.Calibration of XRF core scanners for quantitative geochemical logging of sediment cores:theory and application[J].Earth and Planetary Science Letters,2008,27(3/4):423-438.
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