Cryogenic cave carbonate and implications for thawing permafrost at Winter Wonderland Cave, Utah, USA
Jeffrey S. Munroe, Kristin Kimble, Christoph Spötl, Gabriela Serrato Marks, David McGee, David Herron
Abstract
Abstract Winter Wonderland Cave contains perennial ice associated with two types of cryogenic cave carbonate (CCC) formed during the freezing of water. CCC fine is characterized by relatively high δ 13 C values, whereas CCC coarse exhibits notably low δ 18 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 coarse 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 coarse 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.