Alcock and Muller (1999) assert four inferences regarding Grenville gneisses near New Russia, N.Y. (named “New Russia gneiss complex” by them) and the adjacent ca. 1130 Ma Marcy anorthosite massif. These four inferences follow: (1) metamorphism and anatexis of the New Russia complex were due to contact effects in the thermal aureole of the ca.1130 Ma Marcy anorthosite; (2) pressure estimates in the gneiss suggest anorthosite emplacement pressures of ∼750 MPa; (3) heat from intrusion of the Marcy anorthosite and coeval anorthosite–mangerite–charnockite–granite (AMCG) plutons caused regional granulite-facies metamorphism of the Adirondack Highlands; and (4) the Marcy anorthosite massif,...

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