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Interlaboratory comparison of magnesium isotopic compositions of 12 felsic to ultramafic igneous rock standards analyzed by MC-ICPMS

Teng, Fang-Zhen and Yin, Qing-Zhu and Ullmann, Clemens V and Chakrabarti, Ramananda and von Strandmann, Philip AE Pogge and Yang, Wei and Li, Wang-Ye and Ke, Shan and Sedaghatpour, Fatemeh and Wimpenny, Joshua and Meixner, Anette and Romer, Rolf L and Wiechert, Uwe and Jacobsen, Stein B (2015) Interlaboratory comparison of magnesium isotopic compositions of 12 felsic to ultramafic igneous rock standards analyzed by MC-ICPMS. In: GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS, 16 (9). pp. 3197-3209.

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Official URL: http://dx.doi.org/10.1002/2015GC005939

Abstract

To evaluate the interlaboratory mass bias for high-precision stable Mg isotopic analysis of natural materials, a suite of silicate standards ranging in composition from felsic to ultramafic were analyzed in five laboratories by using three types of multicollector inductively coupled plasma mass spectrometer (MC-ICPMS). Magnesium isotopic compositions from all labs are in agreement for most rocks within quoted uncertainties but are significantly (up to 0.3 parts per thousand in Mg-26/Mg-24, > 4 times of uncertainties) different for some mafic samples. The interlaboratory mass bias does not correlate with matrix element/Mg ratios, and the mechanism for producing it is uncertain but very likely arises from column chemistry. Our results suggest that standards with different matrices are needed to calibrate the efficiency of column chemistry and caution should be taken when dealing with samples with complicated matrices. Well-calibrated standards with matrix elements matching samples should be used to reduce the interlaboratory mass bias.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the AMER GEOPHYSICAL UNION, 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA
Department/Centre: Division of Mechanical Sciences > Centre for Earth Sciences
Depositing User: Id for Latest eprints
Date Deposited: 15 Dec 2015 07:47
Last Modified: 15 Dec 2015 07:47
URI: http://eprints.iisc.ac.in/id/eprint/52918

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