3 research outputs found
Age and genetic relationships among CB, CH and CR chondrites
The carbonaceous Bencubbin-like (CB), high-metal (CH), and Renazzo-like (CR)
chondrites are metal-rich chondrites that have been suggested to be genetically
linked and are sometimes grouped together as the CR chondrite clan. Of these,
the CB and CH chondrites are thought to have formed in an impact-generated
vapor-melt plume from material that may be isotopically akin to CR chondrites.
We report Mo, Ti, Cr, and Hf-W isotopic data for CB and CH chondrites in order
to determine their formation time, to assess whether these chondrites are
genetically related, and to evaluate their potential link to CR chondrites. An
internal Hf-W isochron for the CH chondrite Acfer 182 yields an age of 3.8 +-
1.2 Ma after the formation of Ca-Al-rich inclusions (CAIs), which is
indistinguishable from the mean Hf-W model age for CB metal of 3.8 +- 1.3 Ma.
The Mo isotopic data for CB and CH chondrites indicate that both contain some
of the same metal and silicate components, which themselves are isotopically
distinct. As such, the different Mo isotopic compositions of bulk CB and CH
chondrites reflect their distinct metal-to-silicate ratios. CR metal exhibits
the same Mo isotopic composition as CB and CH metal, but CR silicates have
distinct Mo and Ti isotopic compositions compared to CB and CH silicates,
indicating that CB/CH chondrites may be genetically related to CR metal, but
not to CR silicates. Together, the new isotopic data are consistent with
formation of CB and CH chondrites in different regions of a common
impact-generated vapor- melt plume and suggest that the CB and CH metal may
derive from a metal-rich precursor genetically linked to CR chondrites. The
Hf-W systematics of CH and CB chondrites indicate that the impact occurred at
3.8 +- 0.8 Ma after the formation of Ca-Al-rich inclusions and, hence, up to ~1
Ma earlier than previously inferred based on Pb- Pb chronology.Comment: 54 pages, 8 figures, 5 table