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Variable distribution of s-process Hf and W isotope carriers in chondritic meteorites – Evidence from 174Hf and 180W

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Variable distribution of s-process Hf and W isotope carriers in chondritic meteorites – Evidence from 174Hf and 180W. / Elfers, Bo Magnus; Sprung, Peter; Pfeifer, Markus; Wombacher, Frank; Peters, Stefan T.M.; Münker, Carsten.

In: Geochimica et Cosmochimica Acta, Vol. 239, 15.10.2018, p. 346-362.

Research output: Contribution to journalArticle

Harvard

Elfers, BM, Sprung, P, Pfeifer, M, Wombacher, F, Peters, STM & Münker, C 2018, 'Variable distribution of s-process Hf and W isotope carriers in chondritic meteorites – Evidence from 174Hf and 180W' Geochimica et Cosmochimica Acta, vol. 239, pp. 346-362. https://doi.org/10.1016/j.gca.2018.08.009

APA

Elfers, B. M., Sprung, P., Pfeifer, M., Wombacher, F., Peters, S. T. M., & Münker, C. (2018). Variable distribution of s-process Hf and W isotope carriers in chondritic meteorites – Evidence from 174Hf and 180W. Geochimica et Cosmochimica Acta, 239, 346-362. https://doi.org/10.1016/j.gca.2018.08.009

Vancouver

Elfers BM, Sprung P, Pfeifer M, Wombacher F, Peters STM, Münker C. Variable distribution of s-process Hf and W isotope carriers in chondritic meteorites – Evidence from 174Hf and 180W. Geochimica et Cosmochimica Acta. 2018 Oct 15;239:346-362. https://doi.org/10.1016/j.gca.2018.08.009

Author

Elfers, Bo Magnus ; Sprung, Peter ; Pfeifer, Markus ; Wombacher, Frank ; Peters, Stefan T.M. ; Münker, Carsten. / Variable distribution of s-process Hf and W isotope carriers in chondritic meteorites – Evidence from 174Hf and 180W. In: Geochimica et Cosmochimica Acta. 2018 ; Vol. 239. pp. 346-362.

Bibtex

@article{a07954a542dd4737ae67d76b45606257,
title = "Variable distribution of s-process Hf and W isotope carriers in chondritic meteorites – Evidence from 174Hf and 180W",
abstract = "The stepwise acid digestion of primitive chondritic meteorites allows the identification of nucleosynthetic isotope anomalies that are otherwise hidden on the bulk rock scale. Here, we present combined Hf and W isotope data for acid leachates, residues, and bulk rock aliquots of several primitive chondrites that include highly precise analyses of the heavy p-process isotopes 174Hf and 180W. Including data for these two p-process isotopes enables, for the first time, the clear-cut discrimination between s- and r-process contributions to the Hf and W isotope inventory. Our analyses reveal Hf and W isotopic homogeneity at the bulk rock scale, but significant Hf and W isotope anomalies that are complementary between acid leachates and residues. Since both r- to p-process isotope ratios are invariant in leachates and residues, the observed anomalies can unambiguously be tied to variable contributions of carrier phases enriched in s-process nuclides, as previously inferred for, i.e., Mo and Ru in leaching experiments. Hafnium and W isotope anomalies co-vary in leachate and residue fractions from CM chondrites, whereas CO and CV chondrites are characterized by distinctly larger Hf isotope anomalies compared to W. This observation is most likely explained by more efficient homogenization of s-process W carrier(s) or, alternatively, by local redistribution of anomalous W into secondary less resistant phases during parent body and/or nebular processing. This implies the presence of different s-nuclide carrier phases for Hf and W. Several carriers of s-process-material appear to have been selectively dissolved by our leaching protocol, while contributions from r- and p-process Hf and W carrier phases appear invariant, possibly due to the generally more labile nature of their carrier phases during solar nebula and/or parent body processing.",
keywords = "Early solar system, Hafnium, Nucleosynthetic isotope anomalies, p-Process, Presolar carrier phases, Tungsten",
author = "Elfers, {Bo Magnus} and Peter Sprung and Markus Pfeifer and Frank Wombacher and Peters, {Stefan T.M.} and Carsten M{\"u}nker",
year = "2018",
month = "10",
day = "15",
doi = "10.1016/j.gca.2018.08.009",
language = "English",
volume = "239",
pages = "346--362",
journal = "Geochimica et Cosmochimica Acta",
issn = "0016-7037",
publisher = "Elsevier",

}

RIS - suitable for import to EndNote

TY - JOUR

T1 - Variable distribution of s-process Hf and W isotope carriers in chondritic meteorites – Evidence from 174Hf and 180W

AU - Elfers, Bo Magnus

AU - Sprung, Peter

AU - Pfeifer, Markus

AU - Wombacher, Frank

AU - Peters, Stefan T.M.

AU - Münker, Carsten

PY - 2018/10/15

Y1 - 2018/10/15

N2 - The stepwise acid digestion of primitive chondritic meteorites allows the identification of nucleosynthetic isotope anomalies that are otherwise hidden on the bulk rock scale. Here, we present combined Hf and W isotope data for acid leachates, residues, and bulk rock aliquots of several primitive chondrites that include highly precise analyses of the heavy p-process isotopes 174Hf and 180W. Including data for these two p-process isotopes enables, for the first time, the clear-cut discrimination between s- and r-process contributions to the Hf and W isotope inventory. Our analyses reveal Hf and W isotopic homogeneity at the bulk rock scale, but significant Hf and W isotope anomalies that are complementary between acid leachates and residues. Since both r- to p-process isotope ratios are invariant in leachates and residues, the observed anomalies can unambiguously be tied to variable contributions of carrier phases enriched in s-process nuclides, as previously inferred for, i.e., Mo and Ru in leaching experiments. Hafnium and W isotope anomalies co-vary in leachate and residue fractions from CM chondrites, whereas CO and CV chondrites are characterized by distinctly larger Hf isotope anomalies compared to W. This observation is most likely explained by more efficient homogenization of s-process W carrier(s) or, alternatively, by local redistribution of anomalous W into secondary less resistant phases during parent body and/or nebular processing. This implies the presence of different s-nuclide carrier phases for Hf and W. Several carriers of s-process-material appear to have been selectively dissolved by our leaching protocol, while contributions from r- and p-process Hf and W carrier phases appear invariant, possibly due to the generally more labile nature of their carrier phases during solar nebula and/or parent body processing.

AB - The stepwise acid digestion of primitive chondritic meteorites allows the identification of nucleosynthetic isotope anomalies that are otherwise hidden on the bulk rock scale. Here, we present combined Hf and W isotope data for acid leachates, residues, and bulk rock aliquots of several primitive chondrites that include highly precise analyses of the heavy p-process isotopes 174Hf and 180W. Including data for these two p-process isotopes enables, for the first time, the clear-cut discrimination between s- and r-process contributions to the Hf and W isotope inventory. Our analyses reveal Hf and W isotopic homogeneity at the bulk rock scale, but significant Hf and W isotope anomalies that are complementary between acid leachates and residues. Since both r- to p-process isotope ratios are invariant in leachates and residues, the observed anomalies can unambiguously be tied to variable contributions of carrier phases enriched in s-process nuclides, as previously inferred for, i.e., Mo and Ru in leaching experiments. Hafnium and W isotope anomalies co-vary in leachate and residue fractions from CM chondrites, whereas CO and CV chondrites are characterized by distinctly larger Hf isotope anomalies compared to W. This observation is most likely explained by more efficient homogenization of s-process W carrier(s) or, alternatively, by local redistribution of anomalous W into secondary less resistant phases during parent body and/or nebular processing. This implies the presence of different s-nuclide carrier phases for Hf and W. Several carriers of s-process-material appear to have been selectively dissolved by our leaching protocol, while contributions from r- and p-process Hf and W carrier phases appear invariant, possibly due to the generally more labile nature of their carrier phases during solar nebula and/or parent body processing.

KW - Early solar system

KW - Hafnium

KW - Nucleosynthetic isotope anomalies

KW - p-Process

KW - Presolar carrier phases

KW - Tungsten

UR - http://www.scopus.com/inward/record.url?scp=85051632306&partnerID=8YFLogxK

U2 - 10.1016/j.gca.2018.08.009

DO - 10.1016/j.gca.2018.08.009

M3 - Article

VL - 239

SP - 346

EP - 362

JO - Geochimica et Cosmochimica Acta

T2 - Geochimica et Cosmochimica Acta

JF - Geochimica et Cosmochimica Acta

SN - 0016-7037

ER -