Quantitative chemical analyses of rocks with X-ray fluorescence analyzer: major and trace elements in ultrabasic rocks

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1 98 Scientific Note X : Quantitative chemical analyses of rocks with X-ray fluorescence analyzer: major and trace elements in ultrabasic rocks Kimiko Seno and Yoichi Motoyoshi,**- +, +, ;,**. -,/ Abstract: Analytical procedures for major and trace elements (SiO,,TiO,,Al,O -, Fe,O -, MnO, MgO, CaO, Na,O, K,O, P,O /, Ba, Co, Cr, Cu, Nb, Ni, Rb, Sr, V, Y, Zn, Zr) in ultrabasic rocks by means of an X-ray fluorescnece analyzer RIGAKU RIX-*** at the National Institute of Polar Research are summarized. Because ultrabasic rocks are generally characterized by relatively low SiO,, high MgO and FeO, and extremely high concentration of Cr, Ni and Co, we newly draw calibration curves by synthesizing standard samples. These standards were prepared by mixing preexisting geochemical standards, chemical reagents and standard solutions for atomic absorption analysis in order to cover the possible chemical compositions of natural ultrabasic rocks. For the elemental analyses, glass beads were prepared from powder samples that were diluted two times by Spectroflux No. +**B (2* LiBO,,* Li,B.O 1). The matrix correction method and the peak-over-back method were adopted for the measurements of major elements and trace elements, respectively. : X RIX-*** : Rh W X SiO,, TiO,, Al,O -,Fe,O -, MnO, MgO, CaO, Na,O, K,O, P,O / Ba, Co, Cr, Cu, Nb, Ni, Rb, Sr, V, Y, Zn, Zr SiO, MgO FeO Cr, Ni, Co Spectroflux No. +**B; 2* LiBO,,* Li,B.O 1 +:, peak-over-back +:, National Institute of Polar Research, Research Organization of Information and Systems, Kaga +-chome, Itabashi-ku, Tokyo +1-2/+/., Vol..2, No.,, 32 +*3,,**. Nankyoku Shiryô (Antarctic Record), Vol..2, No.,, 32 +*3,,**.,**. National Institute of Polar Research

2 X : X RIX-*** : Rh W X +33/ +330,**, JG-+, JG-+a, JG-,, JG--, JR-+, JR-,, JR--, JA-+, JB-+, JB-+a, JB-,, JB--, JGb-+, JGb-,, JF-+, JF-,, JH-+, JP-+ SiO, FeO MgO Cr, Ni, Co X,**, JP-+ JG-+a : +: / +330,**, Cr.,/ ppm, Ni +-- ppm +*** ppm : +:,,. +,.+. JG-+, JG-+a, JG-,, JG--, JR-+, JR-,, JR--, JA-+, JB-+, JB-+a, JB-,, JB--, JGb-+, JGb-,, JF-+,

3 100 Table +. + List of chemical reagents and standard solutions for atomic absorption analysis. JF-,, JH-+, JP-+ : http: // SiO,,TiO,,Al,O -,Fe,O -, MnO, MgO, CaO, Na,O, K,O, P,O / Fe,O - H,O H,O +** Ba, Co, Cr, Cu, Nb, Ni, Rb, Sr, V, Y, Zn, Zr,,.,. JP-+ JG-+a +: +,: + JA-+ - JP-+ JG-+a +: + JP-+ JG-+a *.3*** g,: + JP-+ +.,*** g JG-+a *.0*** g Spectroflux No. +**B -.0*** g,.-. Cr Ni Cr Ni SiO,,Al,O - Fe,O -, MgO AU-+ AU-0 0. Cr, Ni SiO,,Al,O -,Fe,O -,MgO : +:, Spectroflux No. +**B

4 , Imai et al., +33/, +333 Table,. Recommended values of geochemical standard samples normalized to +** total (Imai et al., +33/, +333). X : 101

5 102 Table -. - Compositions of synthetic samples prepared by mixing geochemical standard samples. Table... Artificially synthesized samples of ultrabasic composition. -. Johnson Matthey Spectroflux No. +**B 32* C,* +33/./* C. +,** C 32* C

6 X : 103../ CO, SO, 32* C /** C 1** C 32* C -* 32* C CO, 3** C,**, +,** C.,*,3* +3* / + +* Co-K a, Cr-K a +** 2* /*.* Ni-K a +** 3* /*./ Ti-K b, Fe-K b + X +330,**, + /* / 0 JP-+ JP-+: JGb-+, JGb-,, JH-+ +: + - JP-+: JG-+a, JR--, JA-+, JB-+a,: +. 2 SiO,, MnO, MgO

7 104 Table /. / Measuring conditions for each element. 0 +:, Table 0. Theoretical matrix correction constants for +:, diluted glass beads. + TiO,,Al,O -,Fe,O -, CaO, Na,O, K,O, P,O /, +

8 X : 105 Fig : : R: Calibration curves for major elements based on the theoretical matrix correction method. : Uncorrected value, : Corrected value based on the theoretical matrix correction, R: Correlation coe$cient

9 106..,. Cr, Ni SiO, Al,O - Fe,O - MgO 0 SiO, + JG-+, JG-,, JG--, JR-+, JR-,, JA-+, JB-+, JB-,, JB--, JGb-+, JF-+, JF-,, JP-+ +- JP-+: JG-+a, JR--, JA-+, JB-+a, JB--, JGb-+, JGb-,, JH-+ +: + 2 JP-+: JG-+a, JR--,JA-+, JB-+a,: +. -, +330 peak-over-back +330,**,, Ni Cr AU-+ AU-0 0 Zr-K a Sr-K a Zr /. JP-+ 1 Cr, Ni ppm,**, +: / +:, +, JP-+ JP-+: JB-+a +: +, JP-+: JG-+a,: + - +** 2 Cr Ni Ni Cr,**,

10 X : 107 Fig.,., Peak-over-back : Peak-over-back : R: Calibration curves for trace elements based on the peak-over-back correction method. : Peak-over-back value, : Synthetic standard sample, R: Correlation coe$cient

11 108 1 JP-+ A, C, D, E, F; Table 1. Comparison of analyses for geochemical standard sample JP-+ and peridotites from Kimberley, South Africa (A, C, D, E, F; unpublished data). Table 2. 2 Comparison of analyses for geochemical standard sample JP-+ and mixed standards samples.

12 X : *+/+ :,**, : XRF -+ +0, +1-. Imai, N., Terashima, S., Itoh, S. and Ando, A. (+33/): +33. compilation of analytical data for minor and trace elements in seventeen GSJgeochemical reference samples, Igneous rock series. Geostand. Newsl., +3, +-/,+-. Imai, N., Terashima, S., Itoh, S. and Ando, A. (+333): +332 compilation of analytical data for five GSJ reference samples: the Instrumental analysis series. Geostand. Newsl.,,-,,,-,/* : / +0,/.,*** : X,3 +*1 +,/. +33/ : X + -3.* : X,.* /- 0-.,**, : X : X RIX -*** / : X, : Rh W X X,3.1 1*.

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