1 Perchlorate and volatiles of the brine of Lake Vida (Antarctica): Implication for the in situ 2 analysis of Mars sediments 3 Fabien Kenig1, Luoth Chou1, Christopher P. McKay2, W. Andrew Jackson3, Peter T. Doran1,4, 4 Alison E. Murray5, Christian H. Fritsen5. 5 6 1Department of Earth and Environmental Sciences, University of Illinois at Chicago, Chicago, 7 Illinois, USA. 8 2Space Science Division, NASA Ames Research Center, Moffett Field, California, USA. 9 3Civil and Environmental Engineering Department, Texas Tech University, Lubbock, Texas, 10 USA. 11 4Present address: Department of Geology and Geophysics, Louisiana State University, Baton 12 Rouge, Louisiana, USA. 13 5Division of Earth and Ecosystem Sciences, Desert Research Institute, Reno, Nevada, USA 14 15 Corresponding author: F. Kenig, Department of Earth and Environmental Sciences, University of 16 Illinois at Chicago, M/C 186, 845 West Taylor Street, Chicago, IL 60607, USA 17 (
[email protected]) 18 19 20 Key points: 21 1- The brine of Lake Vida (Antarctica) contains oxychlorines complicating the study of 22 volatiles 23 2- Carbon-limited experiments do not provide data on the effects of oxychlorine breakdown 24 3- High reduced-carbon/oxychlorine ratio is needed to detect organics on Mars via pyrolysis 25 if these reactants co-occur 1 26 Abstract 27 The cold (-13.4 ˚C), cryoencapsulated, anoxic, interstitial brine of the >27 m-thick ice of Lake 28 Vida (Victoria Valley, Antarctica) contains 49 μg·L-1 of perchlorate and 11 μg·L-1 of chlorate. 29 Lake Vida brine (LVBr) may provide an analog for potential oxychlorine-rich subsurface brine 30 on Mars.