Petrogenesis of Mesozoic, Peraluminous Granites in the Lamoille Canyon Area, Ruby Mountains, Nevada, USA

Two groups of closely associated, peraluminous, two-mica granitic gneiss were identified in the area. The older, sparsely distributed unit is equigranular (EG) with initial εNd ∼ − 8·8 and initial 87Sr/86Sr ∼0·7098. Its age is uncertain. The younger unit is Late Cretaceous (∼80 Ma), pegmatitic, and...

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Bibliographic Details
Published in:Journal of petrology 2003-04, Vol.44 (4), p.713-732
Main Authors: LEE, SANG-YUN, BARNES, CALVIN G., SNOKE, ARTHUR W., HOWARD, KEITH A., FROST, CAROL D.
Format: Article
Language:English
Subjects:
crustal melting
Late Cretaceous
leucogranite
peraluminous
Sevier orogeny
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Summary:Two groups of closely associated, peraluminous, two-mica granitic gneiss were identified in the area. The older, sparsely distributed unit is equigranular (EG) with initial εNd ∼ − 8·8 and initial 87Sr/86Sr ∼0·7098. Its age is uncertain. The younger unit is Late Cretaceous (∼80 Ma), pegmatitic, and sillimanite-bearing (KPG), with εNd from −15·8 to −17·3 and initial 87Sr/86Sr from 0·7157 to 0·7198. The concentrations of Fe, Mg, Na, Ca, Sr, V, Zr, Zn and Hf are higher, and K, Rb and Th are lower in the EG. Major- and trace-element models indicate that the KPG was derived by muscovite dehydration melting (
ISSN:0022-3530
1460-2415
DOI:10.1093/petrology/44.4.713