Cryogenic cave carbonate and implications for thawing permafrost at Winter Wonderland Cave, Utah, USA

• Main Authors: Munroe, Jeffrey, Kimble, Kristin, Spötl, Christoph, Serrato Marks, Gabriela, Mcgee, David, Herron, David
• Other Authors: Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
• Format: Article in Journal/Newspaper
• Language: English
• Published: Springer Science and Business Media LLC 2021
• Subjects: Ice; permafrost
• Online Access: https://hdl.handle.net/1721.1/133805.2

<jats:title>Abstract</jats:title><jats:p>Winter Wonderland Cave contains perennial ice associated with two types of cryogenic cave carbonate (CCC) formed during the freezing of water. CCC<jats:sub>fine</jats:sub> is characterized by relatively high δ<jats:sup>13</jats:sup>C values, whereas CCC<jats:sub>coarse</jats:sub> exhibits notably low δ<jats:sup>18</jats:sup>O values indicating precipitation under (semi)closed-system conditions in a pool of residual water beneath an ice lid. Previous work has concluded that CCC<jats:sub>coarse</jats:sub> forms during permafrost thaw, making the presence of this precipitate a valuable indicator of past cryospheric change. Available geochronologic evidence indicates that CCC formation in this cave is a Late Holocene or contemporary process, and field observations suggest that the cave thermal regime recently changed in a manner that permits the ingress of liquid water. This is the first documented occurence of CCC<jats:sub>coarse</jats:sub> in the Western Hemisphere and one of only a few locations where these minerals have been found in association with ice. Winter Wonderland Cave is a natural laboratory for studying CCC genesis.</jats:p>