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

Evolution of the Blue Ridge basement complex in the eastern Great Smoky Mountains: Evidence from zircon U-Pb geochronology and Nd-Pb isotope geochemistry of basement gneisses
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Published:March 29, 2018
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CiteCitation
D.P. Moecher, E.D. Anderson, D.F. Loughry, Jr., R.J. Quinn, E.A. Larkin, K.B. Walsh, S.D. Samson, A.M. Satkoski, E. Tohver, 2018. "Evolution of the Blue Ridge basement complex in the eastern Great Smoky Mountains: Evidence from zircon U-Pb geochronology and Nd-Pb isotope geochemistry of basement gneisses", Geology at Every Scale: Field Excursions for the 2018 GSA Southeastern Section Meeting in Knoxville, Tennessee, Annette Summers Engel, Robert D. Hatcher, Jr.
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ABSTRACT
The eastern Great Smoky Mountains basement complex consists of the following components: (1) ca. 1350–1325 Ma orthogneiss and mafic xenoliths that represent some of the oldest crust in Appalachian Grenville massifs (similar to “pre-Grenville” basement components in the Adirondack, Green Mountain, Hudson Highland, and Shenandoah massifs); (2) ca. 1150 Ma augen orthogneisses and granitic orthogneisses correlating with the Shawinigan phase of Grenville magmatism; and (3) paragneisses (cover rocks) that have either pre- or syn-Grenville (i.e., Mesoproterozoic) versus post-Grenville (Neoproterozoic) depositional ages, and that experienced Taconian metamorphism and migmatization. Mesoproterozoic paragneisses contain major zircon age modes that require a component...
- absolute age
- Appalachians
- basement
- biotite gneiss
- Blue Ridge Province
- crystallization
- dates
- field trips
- gneisses
- Great Smoky Mountains
- Grenvillian Orogeny
- inclusions
- ion probe data
- magmatism
- major elements
- mass spectra
- Mesoproterozoic
- metamorphic rocks
- metasedimentary rocks
- nesosilicates
- North America
- orthogneiss
- orthosilicates
- outcrops
- paragneiss
- Precambrian
- Proterozoic
- protoliths
- road log
- SHRIMP data
- silicates
- Southern Appalachians
- spectra
- trace elements
- U/Pb
- United States
- upper Precambrian
- xenoliths
- zircon
- zircon group
- Dellwood Quadrangle