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Karst hydrogeology of Tuckaleechee Cove and the western Great Smoky Mountains, Tennessee and North Carolina

By
Benjamin V. Miller
Benjamin V. Miller
U.S. Geological Survey, Lower Mississippi–Gulf Water Science Center, 640 Grassmere Park, #100, Nashville, Tennessee 37211, USA
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Michael W. Bradley
Michael W. Bradley
U.S. Geological Survey, Lower Mississippi–Gulf Water Science Center, 640 Grassmere Park, #100, Nashville, Tennessee 37211, USA
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Teresa L. Brown
Teresa L. Brown
Lincoln Memorial University, Department of Chemistry and Physics, 6965 Cumberland Gap Parkway, Harrogate, Tennessee 37752, USA
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Published:
March 29, 2018
Publication history
08 January 2018

ABSTRACT

The geology of Great Smoky Mountains National Park (GRSM) in Tennessee and North Carolina is dominated by siliciclastics and metamorphic strata. However, in the western portion of GRSM, a series of carbonate fensters (windows) expose the Lower Ordovician–age section of the Knox Group, a series of dolomite and limestone units that are partially marbleized as a result of contact metamorphism from the Great Smoky fault. The fensters create opportunities for allogenic recharge to occur at points along the contact of the surrounding insoluble strata with the underlying soluble carbonates. The combination of chemically aggressive surface recharge and vertical relief has resulted in the formation of deep caves, many of which have active streams and water resources. Though the karst is limited in extent and the number of caves is fairly small, the significance of the resources is substantial, with several of the caves in the area over 150 m in depth and at least two being major bat hibernacula. In 2017, the U.S. Geological Survey (USGS) began a study to better understand the hydrologic behavior of these karst systems through hydrologic and geochemical monitoring, groundwater tracing using fluorescent dyes, and seepage runs. Stage and water-quality instrumentation was installed in two caves in GRSM, the main stream of Bull Cave, and in a sump pool in Whiteoak Blowhole, at 173 m and 70 m below land surface, respectively. Following setup of the cave sites, dye injections were conducted to determine discharge points for four of the deep cave systems on Rich Mountain and Turkeypen ridge. Results show water in these systems has an extremely rapid travel time, with tracers detected from caves to springs in less than 24 h for each of the systems. This field guide describes the complex geology, regional hydrogeology, and unique landscape characterized by high-gradient subterranean streams, carbonate fensters, and deep caves of the GRSM karst.

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GSA Field Guides

Geology at Every Scale: Field Excursions for the 2018 GSA Southeastern Section Meeting in Knoxville, Tennessee

Annette Summers Engel
Annette Summers Engel
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Robert D. Hatcher, Jr.
Robert D. Hatcher, Jr.
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Geological Society of America
Volume
50
ISBN electronic:
9780813756509
Publication date:
March 29, 2018

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