Matches in SemOpenAlex for { <https://semopenalex.org/work/W1969542981> ?p ?o ?g. }
- W1969542981 endingPage "480" @default.
- W1969542981 startingPage "469" @default.
- W1969542981 abstract "The IVA iron meteorites are magmatic cumulates from the core of a small asteroid, which broke apart ∼ 400 Ma ago. As the depletion of this planetary body in volatile elements is expected to be reflected in high U/Pb ratios of its minerals, we embarked on analyzing the isotope composition of Pb in the cm-sized troilite inclusions of Muonionalusta and Gibeon, both iron meteorites belonging to the IVA family. The bulk of the data for nine troilite subsamples of Muonionalusta scatter with an apparent age of 4.57 Ga, which is shown to reflect the presence of both primordial and common terrestrial Pb components, in addition to radiogenic Pb. The most radiogenic subsample, however, has fractions with 206Pb/204Pb ratios as high as over 1000 and gives a statistically significant 207Pb*/206Pb* age of 4565.3 ± 0.1 Ma (MSWD = 0.08), consistent with the 182Hf–182W metal–silicate segregation age of 2.4 ± 2.0 Ma. These data make the age of Muonionalusta the oldest documented yet for all differentiated bodies in the Solar System and constitute the first high-precision Pb–Pb age determined for crystallization of a phase contained within an iron meteorite group, hence advancing our understanding of early Solar System chronology. Using literature values for the cooling rate, and assuming a closure temperature for Pb of 300 °C, it is further estimated that the IVA parent body accreted within 1 Ma of CAI formation and had cooled to the Pb closure temperature within an additional 1–2 Ma. The overlap between the high-precision Pb–Pb and Hf–W ages points to a small, or rapidly fragmented, planetary body. The isotopic composition of Pb in Gibeon troilite yields a significantly younger age of 4544 ± 7 Ma (MSWD = 1.5), consistent with evidence from the 107Pd–107Ag chronometer, but we believe this age has been reset by melting upon shock. One puzzling observation is that the apparent 232Th/238U of Muonionalusta troilite is particularly low (∼ 0.32), requiring a mechanism capable of efficiently fractionating Th from U, presumably the reduction of U to its trivalent form or the crystallization of phosphate. Average Pb concentrations of the order of 5–10 ppb and high 238U/204Pb ratios of > 1000 require U concentrations in troilite in the sub-ppb to one ppb range. This may indicate that troilite inclusions in IVA meteorites do not represent metal-sulfide unmixing, but rather correspond to late-stage S-rich liquid residues from extreme crystallization of the interstitial melts." @default.
- W1969542981 created "2016-06-24" @default.
- W1969542981 creator A5000404492 @default.
- W1969542981 creator A5018498431 @default.
- W1969542981 creator A5036994564 @default.
- W1969542981 creator A5058724816 @default.
- W1969542981 creator A5075189526 @default.
- W1969542981 date "2010-08-01" @default.
- W1969542981 modified "2023-09-25" @default.
- W1969542981 title "The early formation of the IVA iron meteorite parent body" @default.
- W1969542981 cites W1964621123 @default.
- W1969542981 cites W1965350012 @default.
- W1969542981 cites W1969628171 @default.
- W1969542981 cites W1969970773 @default.
- W1969542981 cites W1975279400 @default.
- W1969542981 cites W1976201010 @default.
- W1969542981 cites W1987105179 @default.
- W1969542981 cites W1988400527 @default.
- W1969542981 cites W1989091662 @default.
- W1969542981 cites W2005384095 @default.
- W1969542981 cites W2005863246 @default.
- W1969542981 cites W2007105153 @default.
- W1969542981 cites W2007377514 @default.
- W1969542981 cites W2007621360 @default.
- W1969542981 cites W2008398749 @default.
- W1969542981 cites W2014301832 @default.
- W1969542981 cites W2015342954 @default.
- W1969542981 cites W2028487454 @default.
- W1969542981 cites W2031054266 @default.
- W1969542981 cites W2033136430 @default.
- W1969542981 cites W2033716739 @default.
- W1969542981 cites W2034945236 @default.
- W1969542981 cites W2035363714 @default.
- W1969542981 cites W2036061423 @default.
- W1969542981 cites W2040328046 @default.
- W1969542981 cites W2042559531 @default.
- W1969542981 cites W2043150001 @default.
- W1969542981 cites W2044633001 @default.
- W1969542981 cites W2047040143 @default.
- W1969542981 cites W2047046308 @default.
- W1969542981 cites W2051210927 @default.
- W1969542981 cites W2054842898 @default.
- W1969542981 cites W2057820877 @default.
- W1969542981 cites W2059163403 @default.
- W1969542981 cites W2060462572 @default.
- W1969542981 cites W2066235510 @default.
- W1969542981 cites W2070527352 @default.
- W1969542981 cites W2073066596 @default.
- W1969542981 cites W2078007647 @default.
- W1969542981 cites W2088908442 @default.
- W1969542981 cites W2089996312 @default.
- W1969542981 cites W2091287137 @default.
- W1969542981 cites W2094493155 @default.
- W1969542981 cites W2094919066 @default.
- W1969542981 cites W2096471541 @default.
- W1969542981 cites W2106296941 @default.
- W1969542981 cites W2114282862 @default.
- W1969542981 cites W2123531734 @default.
- W1969542981 cites W2129791551 @default.
- W1969542981 cites W2144798637 @default.
- W1969542981 cites W2148448627 @default.
- W1969542981 cites W2154820986 @default.
- W1969542981 cites W2159682293 @default.
- W1969542981 cites W2169812777 @default.
- W1969542981 cites W2322852410 @default.
- W1969542981 doi "https://doi.org/10.1016/j.epsl.2010.05.036" @default.
- W1969542981 hasPublicationYear "2010" @default.
- W1969542981 type Work @default.
- W1969542981 sameAs 1969542981 @default.
- W1969542981 citedByCount "45" @default.
- W1969542981 countsByYear W19695429812012 @default.
- W1969542981 countsByYear W19695429812013 @default.
- W1969542981 countsByYear W19695429812014 @default.
- W1969542981 countsByYear W19695429812015 @default.
- W1969542981 countsByYear W19695429812016 @default.
- W1969542981 countsByYear W19695429812017 @default.
- W1969542981 countsByYear W19695429812018 @default.
- W1969542981 countsByYear W19695429812019 @default.
- W1969542981 countsByYear W19695429812020 @default.
- W1969542981 countsByYear W19695429812021 @default.
- W1969542981 countsByYear W19695429812022 @default.
- W1969542981 countsByYear W19695429812023 @default.
- W1969542981 crossrefType "journal-article" @default.
- W1969542981 hasAuthorship W1969542981A5000404492 @default.
- W1969542981 hasAuthorship W1969542981A5018498431 @default.
- W1969542981 hasAuthorship W1969542981A5036994564 @default.
- W1969542981 hasAuthorship W1969542981A5058724816 @default.
- W1969542981 hasAuthorship W1969542981A5075189526 @default.
- W1969542981 hasConcept C116862484 @default.
- W1969542981 hasConcept C121332964 @default.
- W1969542981 hasConcept C127313418 @default.
- W1969542981 hasConcept C130635790 @default.
- W1969542981 hasConcept C17409809 @default.
- W1969542981 hasConcept C178790620 @default.
- W1969542981 hasConcept C185592680 @default.
- W1969542981 hasConcept C199289684 @default.
- W1969542981 hasConcept C2776342828 @default.
- W1969542981 hasConcept C2777108582 @default.