Physical Sciences and Mathematics Commons^™

Bridging The Gap Between The Foreland And Hinterland Ii: Geochronology And Tectonic Setting Of Ordovician Magmatism And Basin Formation On The Laurentian Margin Of New England And Newfoundland, Francis A. Macdonald, Paul M. Karabinos, James L. Crowley, Eben B. Hodgin, Peter W. Crockford, John W. Delano

Geosciences Faculty Publications and Presentations

Ordovician strata of the Mohawk Valley and Taconic allochthon of New York and the Humber margin of Newfoundland record multiple magmatic and basin-forming episodes associated with the Taconic orogeny. Here we present new U-Pb zircon geochronology and whole rock geochemistry and neodymium isotopes from Early Paleozoic volcanic ashes and siliciclastic units on the northern Appalachian margin of Laurentia. Volcanic ashes in the Table Point Formation of Newfoundland and the Indian River Formation of the Taconic allochthon in New York yield dates between 466.16 ± 0.12 and 464.20 ± 0.13 Ma. Red, bioturbated slate of the Indian River Formation record a …