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Orbital measurements obtained by the MESSENGER Gamma-Ray Spectrometer have been analyzed to determine the surface abundance of chlorine in Mercury’s northern hemisphere. The derived Cl/Si mass ratio is 0.0057±0.001, which for an assumed Si abundance of 24.6wt% corresponds to 0.14±0.03wt% Cl. The abundance of Cl is a factor of 2.9±1.3 higher in the north polar region (>80°N) than at latitudes 0−60°N,...
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