Composition, age, and petrogenesis of Late Cretaceous intrusive rocks in the central Big Belt Mountains, Broadwater and Meagher counties, Montana

Du Bray, E. A.; Snee, L. W.

Abstract:

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.

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USGS Numbered Series

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38285

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Du Bray, E. A.; Snee, L. W.

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ENGLISH

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30 p.

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Professional Paper

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1657

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Composition, age, and petrogenesis of Late Cretaceous intrusive rocks in the central Big Belt Mountains, Broadwater and Meagher counties, Montana; 2002; PP; 1657; Du Bray, E. A.; Snee, L. W.

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2002

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citation/reference

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Composition, age, and petrogenesis of Late Cretaceous intrusive rocks in the central Big Belt Mountains, Broadwater and Meagher counties, Montana; 2002; PP; 1657; Du Bray, E. A.; Snee, L. W.