p-Process 180W anomalies in iron meteorites: Nucleosynthetic versus non-nucleosynthetic origins

Schulz, T.; Münker, Carsten; Peters, Stefan T.M.

doi:10.1016/j.epsl.2012.11.009

Cited by 26 publications

(42 citation statements)

References 56 publications

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“…We note that our 2 SD on ε 180 W is comparable to those of recent studies (Schulz et al. ; Cook et al. ), despite our study including measurement of 180 W in high‐resolution of small silicate samples with low W concentrations such as CAI BE (~300 ng W).…”

Section: Discussionsupporting

confidence: 89%

“…The IVB irons show a large spread in ε 180 W, indicating that the anomalies do not represent a reservoir uniformly enriched in p ‐nuclei and sampled by the IVB parent body prior to its differentiation as proposed by Schulz et al. (). Notably, our low‐resolution ε 180 W data resemble that of Schulz et al.…”

Section: Discussionmentioning

confidence: 76%

“…It is debated whether 180 W is subject to burnout or production during prolonged exposure to cosmic rays (Schulz et al. ; Cook et al. ).…”

Section: Discussionmentioning

confidence: 99%

“…Indeed, spurious burnout signatures were observed in Bendego (IC) and Ainsworth (IIAB) (Schulz et al. ) indicating that the net effect of prolonged cosmic ray exposure is to lower ε 180 W so that burnout dominates putative cosmogenic production of 180 W. In contrast, Cook et al. () showed evidence of cosmogenic production of 180 W, particularly for the IVB iron meteorites.…”

Section: Discussionmentioning

confidence: 99%

“…These included Cape York (IIIAB), Rhine Villa (IIIE), and Bendego (IC) as well as the IVB iron meteorites Tlacotepec, Skookum, and Weaver Mountains, all of which were chosen for direct comparison to the data set of Schulz et al. (). Furthermore, we provide 180 W measurements of a bulk CI chondrite Ivuna and a CAI from CV3 chondrite NWA 8722.…”

Section: Samples and Analytical Methodsmentioning

confidence: 99%

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Tungsten isotopes in bulk meteorites and their inclusions—Implications for processing of presolar components in the solar protoplanetary disk

Holst

Paton

Wielandt

et al. 2015

Meteorit & Planetary Scien

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We present high precision, low-and high-resolution tungsten isotope measurements of iron meteorites Cape York (IIIAB), Rhine Villa (IIIE), Bendego (IC), and the IVB iron meteorites Tlacotepec, Skookum, and Weaver Mountains, as well as CI chondrite Ivuna, a CV3 chondrite refractory inclusion (CAI BE), and terrestrial standards. Our high precision tungsten isotope data show that the distribution of the rare p-process nuclide 180 W is homogeneous among chondrites, iron meteorites, and the refractory inclusion. One exception to this pattern is the IVB iron meteorite group, which displays variable excesses relative to the terrestrial standard, possibly related to decay of rare 184 Os. Such anomalies are not the result of analytical artifacts and cannot be caused by sampling of a protoplanetary disk characterized by p-process isotope heterogeneity. In contrast, we find that 183 W is variable due to a nucleosynthetic s-process deficit/r-process excess among chondrites and iron meteorites. This variability supports the widespread nucleosynthetic s/r-process heterogeneity in the protoplanetary disk inferred from other isotope systems and we show that W and Ni isotope variability is correlated. Correlated isotope heterogeneity for elements of distinct nucleosynthetic origin ( 183 W and 58 Ni) is best explained by thermal processing in the protoplanetary disk during which thermally labile carrier phases are unmixed by vaporization thereby imparting isotope anomalies on the residual processed reservoir.

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Section: Discussionsupporting

confidence: 89%

Section: Discussionmentioning

confidence: 76%

“…It is debated whether 180 W is subject to burnout or production during prolonged exposure to cosmic rays (Schulz et al. ; Cook et al. ).…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Samples and Analytical Methodsmentioning

confidence: 99%