Browsing by Author "Srogi, L.A."
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Item Bedrock Geologic Map Of The Piedmont OF Delaware And The Adjacent Pennsylvania(Newark, DE: Delaware Geological Survey, University of Delaware, 2000) Schenck, W.S.; Plank, M.O.; Srogi, L.A.Item Bedrock Geology Of The Piedmont Of Delaware And Adjacent Pennsylvania(Newark, DE: Delaware Geological Survey, University of Delaware, 2000) Plank, M.O.; Schenck, W.S.; Srogi, L.A.This report accompanies a new map that revises the original bedrock geologic maps of the Delaware Piedmont compiled by Woodruff and Thompson and published by the Delaware Geological Survey (DGS) in 1972 and 1975. Combined detailed mapping, petrography, geochemistry, and U-Pb geochronology have allowed us to redefine two rock units and formally recognize eleven new units. A section of the Pennsylvania Piedmont is included on the new map to show the entire extent of the Mill Creek Nappe and the Arden Plutonic Supersuite.Item Geochemistry Of The Mafic Rocks, Delaware Piedmont And Adjacent Pennsylvania And Maryland: Confirmation Of Arc Affinity(Newark, DE: Delaware Geological Survey, University of Delaware, 2001) Plank, M.O.; Srogi, L.A.; Schenck, W.S.; Plank, T.A.Geochemical data from Ordovician and Silurian mafic rocks in the Wilmington Complex in Delaware, the James Run Formation in Cecil County, Maryland, and the Wissahickon Formation in Delaware and Pennsylvania were collected in conjunction with preparation of a new geologic map of the Delaware-Pennsylvania Piedmont. Although concentrations of most elements may have been disrupted by metamorphism, the more stable high field strength elements, including the rare earth elements (REE), are consistent within mapped lithodemic units and are compared to modern basaltic magmas from relatively well known tectonomagmatic environments.