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• W2916855757 abstract "Research Article| February 21, 2019 The Physical and Chemical Sedimentology of Two High-Altitude Acid Salars in Chile: Sedimentary Processes In An Extreme Environment Kathleen C. Benison Kathleen C. Benison Department of Geology and Geography, West Virginia University, Morgantown, West Virginia 26506-6300, U.S.A. Search for other works by this author on: GSW Google Scholar Journal of Sedimentary Research (2019) 89 (2): 147–167. https://doi.org/10.2110/jsr.2019.9 Article history first online: 21 Feb 2019 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Kathleen C. Benison; The Physical and Chemical Sedimentology of Two High-Altitude Acid Salars in Chile: Sedimentary Processes In An Extreme Environment. Journal of Sedimentary Research 2019;; 89 (2): 147–167. doi: https://doi.org/10.2110/jsr.2019.9 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyJournal of Sedimentary Research Search Advanced Search Abstract The range of environments that host acid brines has not been fully described. Salar Gorbea and Salar Ignorado are two salars in the Andes Mountains of northeastern Chile with surface and groundwater pH as low as 1.8 and salinity as high as 290‰ total dissolved solids (TDS). These salars are surrounded by active volcanoes and are hosted by volcaniclastic sediments. Volcanogenic groundwaters are low-temperature brines that range from extremely acid to neutral. These groundwaters are the source of waters fed upward into small pools of surface waters scattered throughout the salars. The extreme water chemistry in this arid setting leads to precipitation of an unusual assemblage of chemical sediments, including gypsum and other Ca and Mg sulfates, alunite, jarosite, halite, hematite, kaolinite, and native sulfur. Winds sculpt the salar surface, forming blowouts and large ripples and dunes. In particular, large gravel devils, as well as other wind phenomena, rework both volcaniclastic grains and chemical sediments, including gypsum crystals up to 27 cm long. Extremes in temperature cause freezing and thawing and result in cracks and buckled and puffed polygons. Microbial mats are associated with both the lowest- and highest-pH surface waters. Early diagenesis in the top few centimeters of sediment forms displacive crystals, cements, and concretions. The combination of volcanogenic setting with the extreme conditions of high elevation, high solar radiation, intense aridity, strong winds, high salinity, and low pH makes these among the most extreme surface environments on Earth. This paper provides a comprehensive documentation of the sedimentary processes and products of these rare acid salars for the first time. In addition, this study compares and contrasts salars Gorbea and Ignorado to acid saline lakes elsewhere in the world. These Chilean settings, with their acid-brine sedimentary and diagenetic minerals, strong winds, and volcanic terrain, may serve as previously undescribed terrestrial analogs for some martian and some terrestrial sedimentary systems. You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
• W2916855757 created "2019-03-02" @default.
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• W2916855757 date "2019-02-21" @default.
• W2916855757 modified "2023-10-12" @default.
• W2916855757 title "The Physical and Chemical Sedimentology of Two High-Altitude Acid Salars in Chile: Sedimentary Processes In An Extreme Environment" @default.
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• W2916855757 doi "https://doi.org/10.2110/jsr.2019.9" @default.
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