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GEOREF RECORD

Orogenic to postorogenic (1.20-1.15 Ga) magmatism in the Adirondack Lowlands and Frontenac Terrane, southern Grenville Province, USA and Canada

William H. Peck, Bruce W. Selleck, Martin S. Wong, Jeffrey R. Chiarenzelli, Karen S. Harpp, Kurt Hollocher, Jade Star Lackey, Joseph Catalano, Sean P. Regan and Andrew Stocker
Orogenic to postorogenic (1.20-1.15 Ga) magmatism in the Adirondack Lowlands and Frontenac Terrane, southern Grenville Province, USA and Canada
Geosphere (Boulder, CO) (October 2013) 9 (6): 1637-1663

Abstract

Magmatism in the southern Grenville Province records a collisional and postcollisional history during the period 1.20-1.15 Ga in the Adirondack Lowlands (New York State, USA) and the Frontenac terrane (Ontario, Canada). The 1.20 Ga bimodal Antwerp-Rossie suite of the Adirondack Lowlands was produced by subduction in the Trans-Adirondack backarc basin. This was followed by intrusion of the 1.18 Ga alkalic to calc-alkalic Hermon granite, which may have been generated by melting of metasomatized mantle during collision of the Adirondack Lowlands and Frontenac terrane during the Shawinigan orogeny. The Hyde School gneiss plutons intruded the Adirondack Lowlands at 1.17 Ga, and Rockport granite intruded into the Adirondack Lowlands and Frontenac terrane, stitching the Black Lake shear zone, which marks the boundary between these terranes. Subsequent extensional collapse and lithospheric delamination caused voluminous anorthosite-mangerite-charnockite-granite plutonism. In the Frontenac terrane, this event is represented by the 1.18-1.15 Ga Frontenac suite, which is composed predominately of ferroan granitoids produced from melting of the lower crust by underplating mafic magmas. The Edwardsville, Honey Hill, and Beaver Creek plutons are newly recognized members of this suite in the Adirondack Lowlands. High oxygen isotope ratios of this suite in the central Frontenac terrane and western Adirondack Lowlands point to the presence of underthrust altered oceanic rocks in the lower crust. Oxygen isotopes of the Frontenac suite in both terranes preclude its derivation from mantle melts alone.


EISSN: 1553-040X
Serial Title: Geosphere (Boulder, CO)
Serial Volume: 9
Serial Issue: 6
Title: Orogenic to postorogenic (1.20-1.15 Ga) magmatism in the Adirondack Lowlands and Frontenac Terrane, southern Grenville Province, USA and Canada
Affiliation: Colgate University, Department of Geology, Hamilton, NY, United States
Pages: 1637-1663
Published: 20131011
Text Language: English
Publisher: Geological Society of America, Boulder, CO, United States
References: 87
Accession Number: 2013-084974
Categories: Igneous and metamorphic petrologySolid-earth geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 8 tables, geol. sketch map
N43°00'00" - N45°00'00", W76°00'00" - W74°00'00"
Secondary Affiliation: St. Lawrence University, USA, United StatesUnion College, USA, United StatesPomona College, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201350
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