Carbonaceous achondrites Northwest Africa 6704/6693: Milestones for early Solar System chronology and genealogy

Northwest Africa (NWA) 6704/6693 are medium- to coarse-grained achondrites with unique petrologic and geochemical traits that are distinct from the currently established meteorite groups. Here, we report on the extinct ²⁶Al-²⁶Mg and ⁵³Mn-⁵³Cr systems to establish fine-scale chronology of its formation and Cr and Ti isotopic anomalies to constrain the composition of the source reservoir of NWA 6704/6693. Excesses in the neutron-rich ⁵⁴Cr and ⁵⁰Ti isotopes, due to nucleosynthetic anomalies, separate NWA 6704/6693 from the vast majority of established achondrites and instead resemble the excesses seen among the carbonaceous chondrites; specifically, the CR-type chondrites. The excesses in these isotopes indicate a common feeding zone during accretion in the protoplanetary disk between the source of NWA 6704/6693 and that of the carbonaceous chondrites. The ²⁶Al-²⁶Mg data for pyroxene and plagioclase from NWA 6704 yield a (²⁶Al/²⁷Al)₀ = (3.15 ± 0.38)×10⁻⁷ (MSWD = 0.49) and an initial δ²⁶Mg^∗ = −0.004 ± 0.005 at the time of isotopic closure. This initial (²⁶Al/²⁷Al)₀ translates to an absolute age of 4563.14 ± 0.38 Ma, relative to the D'Orbigny angrite. However, given the potential heterogeneity of ²⁶Al, the D'Orbigny angrite might not be a good age anchor for the purpose of calculating ²⁶Al-²⁶Mg ages. The ²⁶Al-²⁶Mg age relative to another carbonaceous achondrite, NWA 2976, is 4562.66 ± 0.60 Ma. The ⁵³Mn-⁵³Cr systematics of NWA 6704/6693 indicate a (⁵³Mn/⁵⁵Mn)₀ of (2.59 ± 0.34) × 10⁻⁶ (MSWD = 1.2) with an evolved initial ε⁵³Cr of +0.14 ± 0.03. The (⁵³Mn/⁵⁵Mn)₀ yields an ⁵³Mn-⁵³Cr age of 4562.17 ± 0.76 Ma relative to the D'Orbigny angrite. Concordant ages determined using the short-lived ²⁶Al-²⁶Mg and ⁵³Mn-⁵³Cr systems and extant ²⁰⁷Pb-²⁰⁶Pb system (4562.60 ± 0.30 Ma for NWA 6704/6693; Amelin et al., 2019) indicate rapid cooling and nearly contemporaneous closing of multiple isotope systems. The ancient crystallization ages and positive ⁵⁴Cr and ⁵⁰Ti anomalies of NWA 6704/6693 indicate widespread melting and differentiation processes occurring in both non-carbonaceous (NC) and carbonaceous chondrite (CC) regions of the protoplanetary disk. Additionally, we report the Cr and Ti isotopic composition for a petrologic range of CR-type materials (CR2, CR6, and achondrites). The additional Cr and Ti isotopic data for these CR-type materials indicates a range in isotopic composition not previously observed based on CR2 chondrites alone.