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Scientiﬁc Note

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Quantitative chemical analyses of rocks with X-ray ﬂuorescence analyzer:

major and trace elements in ultrabasic rocks

Kimiko Seno and Yoichi Motoyoshi^῍

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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*ῌLiBO,),*ῌLi,B.O1). The matrix correction method and the peak-over-back method were adopted for the measurements of major elements and trace elements, respectively.

: *+,-.X !RIX-***'/0123: RhῌW 456789: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( ABC@DEF GHI JK

SiO^,LMNOPI JQMgORFeOSTUVF CEICr, Ni, CoWXHYZ [\LMN]VF ÊDI -<_à=>bc=>@=defg hàijBklEmc=>Bm3[\nopqBr stu BvEwo[EF xHyz=>@{| !Spectroflux No.+**B;

2*ῌLiBO^,),*ῌLi^,B^.O¹( }~B+:, !( [\

EF u QA@[\I HnC\V:

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῍ῌ0*+,-.F National Institute of Polar Research, Research Organization of Information and Systems, Kaga+-chome, Itabashi-ku, Tokyo+1-῍2/+/.

,>, Vol..2, No.,,32῍+*3,,**.

Nankyoku Shiryoˆ (Antarctic Record), Vol..2, No.,,32῍+*3,,**.

ῌ,**.National Institute of Polar Research 98

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01 +330(/21 ,**,(345*6 3/ 789: ;<=>?@

89:?@AB!"( 9-'CDE JG-+, JG-+a, JG-,, JG--, JR-+, JR- ,, JR--, JA-+, JB-+, JB-+a, JB-,, JB--, JGb-+, JGb-,, JF-+, JF-,, JH-+, JP-+( )F-D EG5H56 IJ+,KL-MN+-CONP3QR/ STU -F-ONP3VW"3XK/ QYZ[K\5]^_àÒN- +,./ bcdKF-eP)fg*hGìjkKl`6 G lmnok+/ pYZ3qSiO^,[Kl/ FeOrMgOstuKQ

6YZ3Cr, Ni, CoGv*YZK]3/ wxYZ^Xy-z{^

|%}$~dL-MN+Ga`i/ 'CDE-)*F3 -jkK 1`6 U321 ,**,( / !-mnok+-ONP)V W"*/ 'CDEJP-+VBB+( -DE/"gRJG-+a

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JF-,, JH-+, JP-+ : http: //www.aist.go.jp/RIODB/geostand/welcomej.html !"#$%&' ()

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Cr4Ni`Wabcdef Xghijklmn opqrs Cr4Ni tu;Hv% w .&% SiO^,, Al^,O^-xryhijkl zqtC$'Fe^,O^-, MgO{y|}G w;Hv ~$ AU-+_῍AU-04%0

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SiO^,, Al^,O^-, Fe^,O^-, MgO wVWXY,Y; G :\]S+:, L'rs Spectroﬂux No.+**B,^_

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Table+. List of chemical reagents and standard solutions for atomic absorption analysis.

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ῌ,Imaietal.,+33/,+333 Table,.Recommendedvaluesofgeochemicalstandardsamplesnormalizedto+**ῌtotal(Imaietal.,+33/,+333).

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Table-. Compositions of synthetic samples prepared by mixing geochemical standard samples.

ῌ . opj(qn rst$EqnGH Table.. Artiﬁcially synthesized samples of ultrabasic composition.

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+ TiO^,, Al^,O^-, Fe^,O^-, CaO, Na^,O, K^,O, P^,O^/, +

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Table/. Measuring conditions for each element.

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Fig.+. 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

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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-+:#"

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Fig.,. Calibration curves for trace elements based on the peak-over-back correction method.

:Peak-over-back value,:Synthetic standard sample,R:Correlation coe$cient

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ῌ 1 JP-+ῌ A, C, D, E, F;

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Table1. Comparison of analyses for geochemical standard sample JP-+ and peridotites from Kimberley,South Africa(A,C,D,E,F;unpublished data).

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Table2. Comparison of analyses for geochemical standard sample JP-+ and mixed standards samples.

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Imai, N., Terashima, S., Itoh, S. and Ando, A. (+333):+332compilation of analytical data for ﬁve GSJ reference samples: the “Instrumental analysis series”. Geostand. Newsl.,,-,,,-ῌ,/*.

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