^1,2,3Zongcheng Lin et al. (>10)*
¹Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai 264209, China
²Department of Earth & Planetary Sciences and McDonnell Center for the Space Sciences, Washington University, St Louis, Missouri 63130, USA
³Key Laboratory of Lunar and Deep Space Exploration, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
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Reference
Lin Z et al. (2015) Correlated compositional and mineralogical investigations at the Chang′e-3 landing site. Nature Communications 6,8880
Link to Article [doi:10.1038/ncomms9880]

^1,2Zongcheng Ling, ¹Fengke Cao, ¹Yuheng Ni, ¹Zhongchen Wu, ¹Jiang Zhang, ¹Bo Li
¹Shandong Provincial Key Laboratory of Optical Astronomy & Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai 264209, China
²Key Laboratory of Lunar and Deep Space Exploration, Chinese Academy of Sciences, Beijing 100012, China

Detailed chemical, structural and spectroscopic properties of jarosite solid solution minerals are key information for their potential discoveries by future remote sensing and in-situ detections on Mars. We successfully synthesized seven homogeneous K-Na jarosite solid solutions under hydrothermal conditions at 140°C, whose phase identifications and chemical compositions are confirmed by X-ray diffraction (XRD) and inductively coupled plasma mass spectrometry (ICP-MS). The chemical ratios of K/(K+Na) in jarosite solid solutions lead to systematic shifts of their characteristic Raman peaks ν1 (SO4)2− (from 1006 to 1011.3 cm−1), ν3 (SO4)2− (from 1100.6 to 1111.2 cm−1), ν2 (SO4)2− (from 434.2 to 444.8 cm−1) with the increase of Na content. While the OH stretching mode decreases with even larger peak position variations (e.g., ∼3410 cm−1 peak shifts from 3410.5 to 3385.7 cm−1) as the K-Na jarosite solid solutions are enriched in Na content. Raman spectroscopic measurements of the seven K-Na jarosite solid solutions enabled us to build a calibration that uses Raman peak positions to estimate K-Na variation in jarosite, which is the key step for their possible applications in the future Raman applications on Mars’ missions (e.g., ExoMars and Mars 2020 missions). The band assignments and compositional related variations of their XRD, near-infrared (NIR) and mid-infrared (MIR) spectra also provide informative clues for identifying the jarosite minerals and inferring their composition during Martian in-situ and remote sensing measurements.

Reference
Ling Z,Cao F,Ni Y,Wu Z,Jiang Zhanga,Li B (2016) Correlated analysis of chemical variations with spectroscopic features of the K-Na jarosite solid solutions relevant to Mars. Icarus (in Press)
Link to Article [doi:10.1016/j.icarus.2016.01.028]
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