I was surprised to see Pat Rocher's picture of a salt lake near Paso Sico, since I was in the area in December (just before Christmas) and am currently processing and assembling my photos from that trip. I was in Argentina and Chile for two and a half months, so I have a few pictures to sort through.
I didn't get all of the way up to Paso Sico, but made it to Laguna Miscanti and Laguna Miniques, which are about 55 km WNW of Paso Sico. I put this pano together last month and was inspired to share.
Nikon D5100, Nikon 18-200 VR zoom, polarizer, pre-processed in DxO, resized with a slight contrast adjustment in Corel Photo-Paint. Shot 22 Dec 2012.