A short-lived 26Al induced hydrothermal alteration event in the outer solar system: Constraints from Mn/Cr ages of carbonates

摘要: Abstract A key process in the early solar system that significantly affects further evolution and transport of highly volatile elements throughout hydrothermal parent body alteration. To determine whether alteration outer bodies occurred more or less simultaneously due to a sequence multiple different events, we investigated low-temperature hydrothermally altered CM CI chondrites along with volatile-rich CM-like clasts C1 abundant mineral phases contain volatiles. In this respect, are particularly important as they closely resemble but originate from isotopically bodies. Specifically, applied SIMS-based Mn/Cr situ dating technique carbonates, common formed phase meteorites. The ages dolomites well calcites reveal nearly all carbonates were within brief period between 2-6 Ma after CAI formation. Given sharp separation, hardly any material contains later than ∼6 formation, likely near-contemporaneously among system. Further, timing matches peak heating 26Al decay ceased at ∼5 Hereby, these results consistent model which precipitated fluid produced by melting ice. also show other potential events (e.g., impacts) only negligibly contributed creating environments where fluid-mediated dissolution precipitation was possible. Additionally, isotopic (H, O, Cr, S) differences most not caused aqueous and, thus, best explained spatially reservoirs.