Elevating Geoscience in the Southeastern United States: New Ideas about Old Terranes—Field Guides for the GSA Southeastern Section Meeting, Blacksburg, Virginia, 2014
This volume includes 10 field guides that explore the diverse geology of the southern and central Appalachians. These guides examine both ancient rocks and modern landscape processes, highlighting new research ideas regarding these old terranes. Three guides focus on the geology of the Appalachian Plateau and Valley and Ridge, considering topics such as the enigmatic Eocene igneous rocks, the gas-rich Marcellus and Millboro Shales, and new models for karst formation. The 2011 M5.8 Mineral, Virginia, earthquake literally shook up our understanding of the Piedmont and two guides focus on new research in the epicentral region. Two guides take in the Paleozoic to Proterozoic geology of the Blue Ridge province. The volume is rounded out by three guides focused on Mesozoic geology, including the world-class Lagerst–tte fauna in the Dan River basin, a unique uranium deposit at Coles Hill, Virginia, and the tectonics of the Scottsville Basin.
Active features along a “passive” margin: The intriguing interplay between Silurian–Devonian stratigraphy, Alleghanian deformation, and Eocene magmatism of Highland and Bath Counties, Virginia
Department of Geology and Environmental Science, MSC 6903, 395 South High Street, James Madison University, Harrisonburg, Virginia 22807, USA
Department of Geology and Environmental Science, MSC 6903, 395 South High Street, James Madison University, Harrisonburg, Virginia 22807, USA
Department of Geology and Environmental Science, MSC 6903, 395 South High Street, James Madison University, Harrisonburg, Virginia 22807, USA
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Published:January 01, 2014
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CiteCitation
John T. Haynes, Elizabeth A. Johnson, Steven J. Whitmeyer, 2014. "Active features along a “passive” margin: The intriguing interplay between Silurian–Devonian stratigraphy, Alleghanian deformation, and Eocene magmatism of Highland and Bath Counties, Virginia", Elevating Geoscience in the Southeastern United States: New Ideas about Old Terranes—Field Guides for the GSA Southeastern Section Meeting, Blacksburg, Virginia, 2014, Christopher M. Bailey, Lorrie V. Coiner
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Abstract
This two-day trip highlights new findings from structural, stratigraphic, and petrologic research in the Valley and Ridge province of Highland, Bath, and Augusta Counties, Virginia, and Pendleton County, West Virginia. The structural emphasis on Days 1 and 2 will be at several scales, from the regional scale of folds and faults across the Valley and Ridge, to outcrop-and hand sample-scale structures. Stops will highlight deformation associated with previously unmapped faults and a second-order anticline in Silurian and Lower Devonian carbonate and siliciclastic strata, specifically the Silurian Tonoloway Limestone, the Silurian–Devonian Helderberg Group, and the Devonian Needmore Shale. The stops on Day 1 will also focus on facies changes in Silurian sandstones, the stratigraphy of the Keyser–Tonoloway formational contact, and new discoveries relevant to the depositional setting and regional facies of the McKenzie Formation in southern Highland County. The focus of the stops on Day 2 will be on the petrology and geochemistry of several exposures of the youngest known volcanic rocks (Eocene) in the eastern United States. Discussions will include the possible structural controls on emplacement of these igneous rocks, how these magmas and their xenoliths constrain the depth and temperature of the lower crust and mantle, and the tectonic environment that facilitated their emplacement.
- Alleghany Orogeny
- Appalachians
- Bath County Virginia
- carbonate rocks
- Cayugan
- Cenozoic
- clastic rocks
- crust
- Devonian
- emplacement
- Eocene
- faults
- field trips
- folds
- grainstone
- guidebook
- Helderberg Group
- Highland County Virginia
- igneous rocks
- inclusions
- Keyser Limestone
- lithofacies
- lower crust
- magmatism
- mantle
- mapping
- McKenzie Formation
- melting
- Middle Silurian
- North America
- Paleogene
- Paleozoic
- passive margins
- plate tectonics
- road log
- sandstone
- sedimentary rocks
- Silurian
- tectonics
- Tertiary
- Tonoloway Limestone
- unconformities
- United States
- Upper Silurian
- Valley and Ridge Province
- Virginia
- volcanic rocks
- whole rock
- xenocrysts
- xenoliths
- Needmore Shale