Calcium isotopic ratios and rare earth element abundances in refractory inclusions from the Allende CV3 chondrite

Huang, Shichun; Farkaš, Juraj; Yu, Gang; Petaev, M. I.; Jacobsen, S. B.

doi:10.1016/j.gca.2011.11.002

Cited by 81 publications

(48 citation statements)

References 60 publications

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“…No matter whether a secondary correction is applied, ( 40 Ca/ 44 Ca) N values reported by Huang et al . () are different from other studies (Russell et al . , Simon et al .…”

Section: Mass‐independent Isotopic Compositions Of Geological Materialscontrasting

confidence: 99%

“…Mass‐independent Ca isotopic data are commonly reported in traditional ε values relative to a certain geological reservoir, for example, carbonate NIST SRM 915a (Huang et al . , Naumenko‐Dèzes et al . ).

ε^{i / 44} Ca false(SAM false) = [\frac{{(^{i} Ca /^{44} {Ca}_{normalSAM})}_{N}}{{(^{i} Ca /^{44} {Ca}_{SRM 915 a})}_{N}} - 1] \times 1000

where i can be 40, 43, 46 or 48, and subscript N represents internal normalisation to 42 Ca/ 44 Ca = 0.31221.…”

Section: Two Types Of Ca Isotopic Effectsmentioning

confidence: 97%

“…, Huang et al . ), age information by the 40 K‐ 40 Ca isotopic system (Marshall and DePaolo , , Caro et al . ) and the global Ca cycle from the surface to deep mantle (De La Rocha and DePaolo , Farkaš et al .…”

Section: Two Types Of Ca Isotopic Effectsmentioning

confidence: 99%

“…Natural Ca isotopic effects can be divided into two types, namely mass‐independent and mass‐dependent isotopic effects (e.g., Niederer and Papanastassiou , Huang et al . ). During unspiked measurements, natural and instrumental mass‐dependent fractionation is internally corrected to 42 Ca/ 44 Ca = 0.31221 using the exponential law (Russell et al .…”

Section: Two Types Of Ca Isotopic Effectsmentioning

confidence: 99%

“…Discrimination of these two types of effects can be obtained using combined mass‐independent and mass‐dependent isotopic measurements (Huang et al . , Schiller et al . ) or based on simultaneously reported δ 44/40 Ca and δ 44/42 Ca using a 43 Ca‐ 48 Ca double‐spike (Huang et al .…”

Section: Two Types Of Ca Isotopic Effectsmentioning

confidence: 99%

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Mass‐Independent and Mass‐Dependent Ca Isotopic Compositions of Thirteen Geological Reference Materials Measured by Thermal Ionisation Mass Spectrometry

Wang

Zhu

et al. 2016

Geostandard Geoanalytic Res

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We report mass‐independent and mass‐dependent Ca isotopic compositions for thirteen geological reference materials, including carbonates (NIST SRM 915a and 915b), Atlantic seawater as well as ten rock reference materials ranging from peridotite to sandstone, using traditional ε and δ values relative to NIST SRM 915a, respectively. Isotope ratio determinations were conducted by independent unspiked and 43Ca‐48Ca double‐spiked measurements using a customised Triton Plus TIMS. The mean of twelve measurement results gave ε40/44Ca values within ± 1.1, except for GSP‐2 that had ε40/44Ca = 4.04 ± 0.15 (2SE). Significant radiogenic 40Ca enrichment was evident in some high K/Ca samples. At an uncertainty level of ± 0.6, all reference materials had the same ε43/44Ca and ε48/44Ca values. We suggest the use of δ44/42Ca to report mass‐dependent Ca isotopic compositions. The precision under intermediate measurement conditions for δ44/42Ca over eight months in our laboratory was ± 0.03‰ (with n ≥ 8 repeat measurements). Measured igneous reference materials gave δ44/42Ca values ranging from 0.27‰ to 0.54‰. Significant Ca isotope fractionation may occur during magmatic and metasomatism processes. Studied reference materials with higher (Dyn/Ybn) tend to have lower δ44/42Ca, implying a potential role of garnet in producing magmas with low δ44/42Ca. Sandstone GBW07106 had a δ44/42Ca value of 0.22‰, lower than all igneous rocks studied so far.

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“…No matter whether a secondary correction is applied, ( 40 Ca/ 44 Ca) N values reported by Huang et al . () are different from other studies (Russell et al . , Simon et al .…”

Section: Mass‐independent Isotopic Compositions Of Geological Materialscontrasting

confidence: 99%