Ubiquitous isotopic anomalies in Ti from normal Allende inclusions

The Isotope Geochemistry of Ni

“…1), which they noted was in keeping with a neutronrich, equilibrium process nucleosynthesis. These findings were pleasingly compatible with 170 anomalies in neutron-rich isotopes of Ca (Jungck et al, 1984) and Ti (Heydegger et al, 1979;Niederer et al, 1980;Niemeyer and Lugmair, 1981) from previous studies and excesses of 54 Cr in their own work (Birck and Lugmair, 1988). This landmark contribution identified the key mass-independent variations in Ni isotopes that would subsequently become apparent in bulk meteorite analyses.…”

Isotopic records in CM hibonites: Implications for timescales of mixing of isotope reservoirs in the solar nebula

“…6a). One possibility is that there might exist one dominant source for 26 Mg depletions (perhaps well-mixed interstellar dust), whereas titanium isotope variations in CAIs and hibonites are known to require mixing of at least 4 different components (Niemeyer and Lugmair, 1981;Fahey et al, 1987a). As expected, the magnesium anomalies also do not correlate with oxygen isotopic composition probably because the latter is generated by a pervasive chemical effect in the early solar system (see Section 5.5 below).…”

“…Ireland (1988Ireland ( , 1990 demonstrated that the isotopic characteristics of CM hibonites are correlated with morphological type, in that the PLACs typically exhibit large isotope anomalies (excesses and deficits) in the neutron-rich isotopes of calcium and titanium (Fahey et al, 1985(Fahey et al, , 1987aIreland et al, 1985;Hinton et al, 1987;Zinner et al, 1986). These anomalies are qualitatively similar to those found commonly in CV CAIs (e.g., Niederer et al, 1980;Niemeyer and Lugmair, 1981;Niederer and Papanastassiou, 1984), but quantitatively exceed the latter by more than two orders of magnitude, thus constituting the largest isotopic anomalies of nucleosynthetic origin for minerals considered to have formed in the solar system.…”

Short-Lived Radionuclides and Early Solar System Chronology

“…In principle, excesses of a radiogenic daughter isotope could be 'inherited' from an interstellar (grain) component, in a manner similar to what is known to have occurred for some stable isotope anomalies in CAIs and, to a smaller extent, in bulk meteorites (e.g., Begemann, 1980;Burkhardt et al, 2011;Carlson et al, 2007;Dauphas et al, 2002;Fahey et al, 1987;Niederer et al, 1980;Niemeyer and Lugmair, 1981;Qin et al, 2011;Trinquier et al, 2009;Zhang et al, 2012). In such a case, the correlation of excess daughter isotope with radioactive parent would represent a mixing line rather than in situ decay from the time of last chemical fractionation.…”