Elemental mapping by Dawn reveals exogenic H in Vesta's regolith.

  title={Elemental mapping by Dawn reveals exogenic H in Vesta's regolith.},
  author={T H Prettyman and David W. Mittlefehldt and N. Yamashita and David J. Lawrence and Andrew W. Beck and William C. Feldman and tiMotHy J. Mccoy and H Y McSween and Michael J. Toplis and T. N. Titus and Pasquale Tricarico and R. C. Reedy and John S. Hendricks and Olivier Forni and Lucille Le Corre and J. Li and Hugau Mizzon and Vishnu Reddy and Carol A. Raymond and Christopher T Russell},
  volume={338 6104},
Using Dawn's Gamma Ray and Neutron Detector, we tested models of Vesta's evolution based on studies of howardite, eucrite, and diogenite (HED) meteorites. Global Fe/O and Fe/Si ratios are consistent with HED compositions. Neutron measurements confirm that a thick, diogenitic lower crust is exposed in the Rheasilvia basin, which is consistent with global magmatic differentiation. Vesta's regolith contains substantial amounts of hydrogen. The highest hydrogen concentrations coincide with older… CONTINUE READING
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