| Titre : | U.S. Geological Survey professional paper, 1657 - Composition, age, and petrogenesis of Late Cretaceous intrusive rocks in the central Big Belt Mountains, Broadwater and Meagher counties, Montana |
| Auteurs : | Edward A. Du Bray, Auteur ; L.W. Snee, Auteur |
| Type de document : | Bulletin : texte imprimé |
| Paru le : | 01/01/2002 |
| Année de publication : | 2002 |
| Format : | 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. |
Exemplaires (1)
| Code-barres | Cote | Support | Section | Disponibilité |
|---|---|---|---|---|
| FFS035809 | 2.2 USGS PP | Périodiques | Géographique | Consultable sur place Exclu du prêt |
