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Carbonaceous chondrites (CCs) may have been the carriers of water, volatileand moderately volatile elements to Earth. Investigating the abundances ofthese elements, their relative volatility, and isotopes of state-change tracerelements such as Zn, and linking these observations to water contents, providevital information on the processes that govern the abundances and isotopicsignatures of these species in CCs and other planetary bodies. Here we reportZn isotopic data for 28 CCs (20 CM, 6 CR, 1 C2-ung, and 1 CV3), as well astrace element data for Zn, In, Sn, Tl, Pb, and Bi in 16 samples (8 CM, 6 CR, 1C2-ung, and 1 CV3), that display a range of elemental abundances fromcase-normative to intensely depleted. We use these data, water content datafrom literature and Zn isotopes to investigate volatile depletions and todiscern between closed and open system heating. Trace element data have beenused to construct relative volatility scales among the elements for the CM andCR chondrites. From least volatile to most, the scale in CM chondrites isPb-Sn-Bi-In-Zn-Tl, and for CR chondrites it is Tl-Zn-Sn-Pb-Bi-In. Theseobservations suggest that heated CM and CR chondrites underwent volatile lossunder different conditions to one another and to that of the solar nebula, e.g.differing oxygen fugacities. Furthermore, the most water and volatile depletedsamples are highly enriched in the heavy isotopes of Zn. Taken together, theselines of evidence strongly indicate that heated CM and CR chondrites incurredopen system heating, stripping them of water and volatiles concomitantly,during post-accretionary shock impact(s).

geochimica et cosmochimica acta

A history of violence: insights into post-accretionary heating in  carbonaceous chondrites from volatile element abundances, Zn isotopes, and  water contents