High-Resolution Measurements of Mercury's Surface

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High-resolution measurements of Mercury’s surface composition with the MESSENGER X-Ray Spectrometer Elizabeth A. Frank1 Larry R. Nittler1 Audrey H. Vorburger2 Shoshana Z. Weider1 Richard D. Starr3,4 Sean C. Solomon1,5 1Carnegie Institution of Washington 2American Museum of Natural History 3The Catholic University of America 4NASA Goddard Space Flight Center NASA/APL/CIW 5Columbia University Data X-Ray Spectrometer (XRS) data collected April 2011 through April 2015: ~19,000 quiet-Sun spectra (Mg, Al, Si) ~1,800 flare analyses (Mg, Al, Si, S, Ca, Ti, Fe) Observations from the low-altitude campaign have allowed us to resolve geological-scale features. 1Nittler et al. 2011; Weider et al. 2012, 2014, 2015 plains outlines from Denevi et al. (2013) Maps: Mg/Si December 2013 (Weider et al. 2015) northern plains Caloris high-Mg region (HMR) New Maps: Al/Si December 2013 (Weider et al. 2015) northern plains HMR Caloris New Maps: Al/Mg northern plains HMR Caloris Maps: S/Si, Ca/Si, Fe/Si Previous S/Si New S/Si Previous Ca/Si New Ca/Si Previous Fe/Si New Fe/Si previous maps from Weider et al. (2015) Maps: Mg/Si, footprints <100 km across Features of interest: High-Mg region (HMR) Mg/Si S/Si Impact basin?1 Fe/Si crustal thickness2 1Weider et al. 2015 2James et al. 2014 Features of interest: Crater in HMR Mg/Si Mg/Si HMRAl/Si Features of interest: Crater in HMR Mg/Si Mg/Si HMR Al/Si Features of interest: Crater in HMR HMR D = ~150 km Praxiteles Features of interest: Rachmaninoff MDIS enhanced color Mg/Si Features of interest: Caloris MDIS enhanced color Mg/Si Features of interest: Fresh deposit near Gauguin Crater 75 Mg/Si 70 0.90 0.75 2020 kmkm GauguinGauguin 0.60 65 0.50 0.30 0.15 60 Al-Akhtal Al-Akhtal 0.00 55 -110 -105 -100 -95 -90 -85 -80 Summary • Low-altitude orbits and an active Sun allowed for the highest-resolution geochemical maps of Mercury. • The high-Mg region is S-, Ca-, and Fe-rich but also heterogeneous. • Small-footprint measurements show resolvable correlations with geologic features. • Future: BepiColombo will provide high-resolution XRF measurements (including of the S. hemisphere!). Footprints Ai = footprint area weighting factor (wi): σi = error Maps: S/Si Previous: Weider et al. (2015) New Maps: Ca/Si Previous: Weider et al. (2015) New Maps: Fe/Si Previous: Weider et al. (2015) New Maps: Fast neutrons (Lawrence et al. 2015, LPSC).

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