Item talk:Q56725: Difference between revisions
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Latest revision as of 23:09, 14 August 2024
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Detrital zircon analysis confirms that the Silurian-Devonian Quantico Formation is a postorogenic successor basin, with zircons derived primarily from Ordovician Chopawamsic Formation volcanic rocks. Detrital zircons from strata of the Long Island syncline, previously mapped as a separate successor basin, have a peri-Gondwanan component distinct from Laurentian-sourced rocks of the Potomac terrane to the west. Volcanism of the Chopawamsic Formation spanned at least 14 million years during the Ordovician. The Chopawamsic Formation contains sheet-like Late Ordovician-Silurian granodioritic and tonalitic intrusions that were once mapped as Carboniferous. Biotite-muscovite migmatitic paragneiss, which borders the Chopawamsic Formation on its southeast side and also occurs east of the Lakeside fault, preserves evidence of Silurian deformation and metamorphism, with a Carboniferous (Alleghanian) overprint. Limited SHRIMP-RG analysis of detrital zircons from this paragneiss yields a Laurentian (Mesoproterozoic) signature, which suggests that the structurally concordant contact between volcanic rocks of the Chopawamsic Formation and paragneiss is either a pre-Alleghanian fault or an unconformity.", "description": "Report: vi, 28 p.; 2 Tables", "publisher": { "@type": "Organization", "name": "U.S. Geological Survey" }, "author": [ { "@type": "Person", "name": "Evans, Nick H.", "givenName": "Nick H.", "familyName": "Evans", "affiliation": [ { "@type": "Organization", "name": "Center for Sustainable Groundwater" } ] }, { "@type": "Person", "name": "Burton, William C. bburton@usgs.gov", "givenName": "William C.", "familyName": "Burton", "email": "bburton@usgs.gov", "identifier": { "@type": "PropertyValue", "propertyID": "ORCID", "value": "0000-0001-7519-5787", "url": "https://orcid.org/0000-0001-7519-5787" }, "affiliation": [ { "@type": "Organization", "name": "Florence Bascom Geoscience 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