Modeling and mitigation of sample relief effects applied to chemistry measurements by the Mars Science Laboratory Alpha Particle X‐ray Spectrometer

摘要: The Alpha Particle X-ray Spectrometer (APXS) onboard the Mars rover Curiosity conducts high-precision in situ chemical measurements of rocks and regolith. Target surfaces are not always flat thus can pose issues for interpretations that assume such. Here, we investigate when variable target relief is an important effect to consider APXS targets. We provide operational recommendations on how most efficiently study targets significant changes surface with rover-arm-mounted Hand Lens Imager camera. Additionally, deconvolve chemistry heterogeneous vertical encountered along Curiosity's traverse, providing composition visible endmembers process. Specifically, presented here deconvolved endmember compositions two recent first a manganese-rich, calcium-rich, zinc-rich dark-toned vein at Garden City chemically visually unique compared intermixed light-toned Ca-sulfate-dominated vein. other weathered Mg-sulfate-rich nodule previously had nickel enrichment. distinctly different both nodules traverse provides further evidence either multiple fluid events or evolving ancient Mars. Copyright © 2017 John Wiley & Sons, Ltd.