The quest for regolithic howardites. Part 1: Two trends uncovered using noble gases
Cartwright, J. A., Ott, U., Mittlefehldt, D. W., , Quinn, J. E.(2013). The quest for regolithic howardites. Part 1: Two trends uncovered using noble gases. Geochimica et Cosmochimica Acta, 105, 395-421. https://doi.org/10.1016/j.gca.2012.11.047
Ni, Al2O3 contents, estimated E:D ratio, estimated regolithic grade, and estimated carbonaceous chondrite proportion in our ten howardites, the regolithic howardites defined by Warren et al. (2009), and five other possible regolithic howardites
ICPMS, XRF
Ni, Al2O3
2
He and Ne noble gas concentrations for our measured howardites and Murchison. Concentrations given in ccSTP/g
MS
Ne21cos, He3, He4, Ne22, Ne20tr
3
Ar, Kr and Xe noble gas concentrations for our measured howardites and Murchison. Concentrations given in ccSTP/g
MS
Ar38cos, Ar36, Kr84, Ar40, Xe132, Ar36tr
4
He and Ne ratios of our measured howardites and Murchison
MS
Ne22_Ne21cos, Ne21_Ne22, Ne20_Ne22, He3_He4
5
Ar, Xe and elemental ratios of our howardites and Murchison
More details are available for the following variables
CALCULATED
UNKNOWN
Preferred age. The T126 is used as the preferred age for SCO 06040, as the cosmogenic Xe content is least likely affected by the loss of the 1000 °C step compared to Ne and Ar.
