Research paperPrimordial Ce isotopic composition of the solar system
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Cited by (33)
Cerium stable isotope analysis of synthetic and terrestrial rock reference materials by MC-ICPMS
2021, TalantaCitation Excerpt :Early works by Umemoto [23] and Kuroda [24], reported chemical separation methods of Ce from the sample matrix, which are necessary for its precise isotopic measurements, and compared measured chondritic and terrestrial values. The introduction of La–Ce geochronometer by Tanaka and Masuda [25] focused most of Ce isotopic studies in the following years towards radiogenic 138Ce measurements [26–32], leaving stable isotope variations poorly investigated. However, recent works on this subject have produced interesting data and a promising opening of a new topic in REE geochemistry [33–41].
Earth's chondritic light rare earth element composition: Evidence from the Ce–Nd isotope systematics of chondrites and oceanic basalts
2019, Earth and Planetary Science LettersCitation Excerpt :Hence, if nucleosynthetic isotope anomalies would play a role, a covariance between the mass fractionation corrected 140Ce/142Ce and 138Ce/136Ce in chondrites would be expected, but is not observed (supplementary Fig. 1), consistent with the results from Makishima and Masuda (1994b). The MORB data produced in this study overlap with the MORB data presented by Bellot et al. (2015) and by Makishima and Masuda (1993) (after correction to a common AMES value for Bellot et al., 2015 and a common BCR value for Makishima and Masuda, 1993). For a given range in 143Nd/144Nd, MORB show greater variation in 138Ce/136Ce than OIB, consistent with observations from pioneering Ce isotope studies (Makishima and Masuda, 1994a; Tanaka et al., 1987) although the magnitude of the observed variability is greatly reduced.
Cerium stable isotope ratios in ferromanganese deposits and their potential as a paleo-redox proxy
2016, Geochimica et Cosmochimica ActaCitation Excerpt :All the samples were measured in triplicate to account for any analytical uncertainty. The δ142Ce value of the working standard was later compared with an international standard (JMC304), originally used in the 138La–138Ce decay system (Tanaka and Masuda, 1982; Makishima and Masuda, 1993; Tanimizu and Tanaka, 2002). Our 33 times measurement on the JMC304 on three different days showed δ142Ce of −0.001 ± 0.024‰ (2 sigma) relative to the Wako Ce solution using the standard bracketed technique.
Ce isotope systematics of island arc lavas from the Lesser Antilles
2015, Geochimica et Cosmochimica ActaCitation Excerpt :Then it seems reasonable to assume that their Ce isotopic compositions are also identical and that the difference represents an analytical biais. Two pioneer studies provided Ce isotopic values for meteoritic materials including chondrites and achondrites from the eucrite group (Shimizu et al., 1984; Makishima and Masuda, 1993). The average chondritic value for 138Ce/142Ce was defined at 0.0225652 ± 24 and is equal to 0.0225664 when the data are normalized to our BCR-2 value (see part 2.3.2).
What coupled cerium and neodymium isotopes tell us about the deep source of oceanic carbonatites
2014, Earth and Planetary Science LettersGeochemical significance of the Rb-Sr, La-Ce and Sm-Nd isotope systems in A-type rocks with REE tetrad patterns and negative Eu and Ce anomalies: The Cretaceous Muamsa and Weolaksan granites, South Korea
2013, Chemie der ErdeCitation Excerpt :ɛ(T) is determined using the equation ɛ(T) = (Rsam(T)/RCHUR(T) − 1) × 10,000 (Table 2; DePaolo and Wasserburg, 1976), where Rsam(T) and RCHUR(T) refer to the isotopic ratios of 143Nd/144Nd or 138Ce/142Ce for the sample and CHUR (chondritic uniform reservoir), respectively, at time T. Present-day parameters for the Nd isotope are (143Nd/144Nd)CHUR(0) = 0.512638, (147Sm/144Nd)CHUR(0) = 0.1966 (Wasserburg et al., 1981). For the (138Ce/142Ce)CHUR(0) value, Makishima and Masuda (1993) suggested 0.0225652 for the present-day bulk earth is 0.0225652 and the 138La/142Ce ratio is 0.00306. Makishima and Masuda (1993) reported 0.0225685 for the 138Ce/142Ce value for JMC304.