Geochemistry Of The Mafic Rocks, Delaware Piedmont And Adjacent Pennsylvania And Maryland: Confirmation Of Arc Affinity
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Date
2001
Journal Title
Journal ISSN
Volume Title
Publisher
Newark, DE: Delaware Geological Survey, University of Delaware
Abstract
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.
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Keywords
Geochemistry, Mafic Rocks, Delaware Piedmont, Pennsylvania, Maryland, Arc Affinity