Mark C. Nottingham's research while affiliated with The University of Manchester and other places

... However, this method relies on the choice of cosmogenic and trapped Ne endmember ratio values, which might lead to discrepancies. Due to this, we prefer to use a second method, based on the study of Nottingham et al. (2022). In this study, the shielding depth is determined using the Ne three-isotope plot, by establishing a mixing line for the different heating steps between cosmogenic and trapped endmembers. ...

... While the exact origin of the variations in Δ 33 S and Δ 36 S values in 75081, 690 is not clear, it appears to be different from the shared 34 S enrichment with 74241, 204, and likely originates from photolytic reactions of S-bearing gaseous molecular species, such as S, SO, SO 2 , H 2 S, and HS. The components of the soils are ancient (Goswami and Lal, 1974), and based on 40 Ar/ 36 Ar trapped for 74241 (7.4) compared to 75081 (0.7), 74241 may have last been exposed to space weathering at 3.13 Ga compared to 0.25 Ga for 75081 (e.g., Curran et al., 2020) which suggests either MIF-S is not linked to processes occurring >3.0 Ga or length of exposure to space weathering is critical for MIF-S production. Although extra-lunar sulfur is thought to contribute to the total sulfur observed in soils (Kerridge et al., 1975;Thode and Rees, 1979), our data are not consistent with acquisition of the MIF-S signature from these sources: the sulfur isotope compositions observed in the meteorite record (Antonelli et al., 2014;Labidi et al., 2017;Dottin et al., 2018;Wu et al., 2018, and references within) do not match our observations. ...