1657 - Composition, age, and petrogenesis of Late Cretaceous intrusive rocks in the central Big Belt Mountains, Broadwater and Meagher counties, Montana (Bulletin de U.S. Geological Survey professional paper, 1657 [01/01/2002]) / Edward A. Du Bray

[n° ou bulletin]  est un bulletin de U.S. Geological Survey professional paper (1984-) 1657 - Composition, age, and petrogenesis of Late Cretaceous intrusive rocks in the central Big Belt Mountains, Broadwater and Meagher counties, Montana [texte imprimé] / Edward A. Du Bray, Auteur ; L.W. Snee, Auteur . - 2002 . - 1 vol. (30 p.) : ill. ; 28 cm. Langues : Américain Catégories : Régions Montana Résumé : Cretaceous intrusions hosted by the Proterozoic Newland Formation. The northern intrusion, centered on Boulder Baldy, consists of outer, intermediate, and core zones composed of aegirine-augite quartz monzonite, hornblende quartz monzodiorite, and biotite granodiorite, respectively. The southern intrusion, north of Mount Edith, is compositionally indistinguishable from the intermediate zone of the northern intrusion. [n° ou bulletin]

Exemplaires

Code-barres	Cote	Support	Section	Disponibilité	Origine
FFS035809	2.2 USGS PP	Périodiques	Géographique	Exclu du prêt

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