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U-Pb zircon geochronology and implications of Cambrian plutonism in the Ellsworth Belt, Maine

Pollock, Jeffrey C ; Reusch, Douglas N ; Dunning, Gregory R

Canadian journal of earth sciences, 2022-02, Vol.59 (2), p.111-122 [Periódico revisado por pares]

1840 Woodward Drive, Suite 1, Ottawa, ON K2C 0P7: National Research Council of Canada

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Título:
U-Pb zircon geochronology and implications of Cambrian plutonism in the Ellsworth Belt, Maine
Autor: Pollock, Jeffrey C ; Reusch, Douglas N ; Dunning, Gregory R
Assuntos: absolute age ; Analysis ; Annidale Belt ; Appalaches ; Appalachians ; Belts ; block structures ; Cambrian ; Cambrien ; Cameron Road Granite ; Coasts ; Crustal thickness ; dates ; Deformation ; Earth science ; Ellsworth Belt ; Ellsworth Schist ; facies ; faults ; Faults (Geology) ; foliation ; Ganderia ; Gandérie ; Geochronology ; Geochronometry ; Granite ; granites ; Greenschist facies ; géochronologie ; igneous and metamorphic rocks ; igneous rocks ; Lamoine Granite ; Lead ; Littoral environments ; low-grade metamorphism ; Magma ; Magmatism ; Maine ; metamorphic rocks ; Metamorphism ; Metamorphism (Geology) ; Methods ; Natural history ; nesosilicates ; Orogeny ; orthosilicates ; Paleozoic ; Penobscot Bay ; Penobscott Orogeny ; Petrology ; plutonic rocks ; protoliths ; Radiometric dating ; Schist ; schistosity ; Schists ; Sedimentary facies ; silicates ; Subduction ; Subduction (geology) ; systems ; Thickening ; U/Pb ; United States ; Uranium-lead dating ; Zircon ; zircon group
É parte de: Canadian journal of earth sciences, 2022-02, Vol.59 (2), p.111-122
Descrição: The Ellsworth belt is one of several fault-bounded blocks exposed along the southeastern coast of Maine that formed within Ganderia. New ID-TIMS U-Pb geochronological data integrated with field relationships provide additional insights into the timing of magmatism and deformation in the Ellsworth belt. The deformed Lamoine Granite was selected for U-Pb zircon analysis to: (i) establish the protolith age; (ii) provide direct temporal constraints on regional low-grade metamorphism and deformation; and (iii) elucidate relationships between the Ellsworth belt and coeval rocks elsewhere in the Appalachian orogen. The Lamoine Granite was emplaced within the Ellsworth Schist at 492 ± 1.7 Ma; this is the first unequivocal evidence for a Furongian magmatic event in the Ellsworth belt. The schistosity in the Lamoine Granite is parallel to the main fabric of the host Ellsworth Schist and provides a maximum estimate for timing of the regional metamorphic overprint. Widespread deformation in the Ellsworth belt where kinematic indicators indicate a top-to-northwest sense of shear is attributed to thrusting during which progressive horizontal shortening, caused crustal thickening and peak greenschist facies metamorphism. The Cambrian U-Pb age permits correlation of the Lamoine Granite with the Cameron Road Granite in the Annidale belt of New Brunswick where subduction-related magmas intruded the Penobscot arc-back-arc and were subsequently deformed during the Penobscot Orogeny.
Editor: 1840 Woodward Drive, Suite 1, Ottawa, ON K2C 0P7: National Research Council of Canada
Idioma: Inglês

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U-Pb zircon geochronology and implications of Cambrian plutonism in the Ellsworth Belt, Maine

Pollock, Jeffrey C ; Reusch, Douglas N ; Dunning, Gregory R

1840 Woodward Drive, Suite 1, Ottawa, ON K2C 0P7: National Research Council of Canada

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