 | | Report (issue) | | Peninsula, Mich. 10. Porphyry molybdenum ore, Colorado 11. Zinc ore, Edwards, N.Y. 12. Manganese nodules...Elements in the Wet Mountains Area, Fremont and Ouster Counties, Colorado By THEODORE J. ARMBRUSTMACHER GEOLOGY...elements in the Wet Mountains area, Fremont and Custer Counties, Colorado. (Geology and resources of thorium...16:1049-F 1. Thorium ores—Colorado—Wet Mountains Region. 2. Earths, Rare—Colorado—Wet Mountains Region. 3...Mountains Region. 4. Mines and mineral resources—Colorado—Wet Mountains Region. I. Title. II. Series. III |  | | Journal (article/letter/editorial) | | ites fromthe Wet MountainsArea, Fremont and Custer Counties,Colorado TnEOr)ORE J. ARMBRUSTMACHER Abstract...with alkalic rocks of the McClure Mountain and Gem Park Complexes, andthecomplex at DemocratCreek,canbeclassified...that the carbonatitereplacing the earlier alkalic dikes also was derived from igneoussources. Exchangeof...hornblendegneisses, associated with and cuttingrocksof the Gem Park and amphibolites--andPrecambrianintrusivegran...Subsequentwork at the Gem Plumeage (1.45 b.y.) (Taylor et al., 1975a,b) (Fig. Park Complex(Parker and Sharp |  | | Journal (article/letter/editorial) | | Complexes in the Wet Mountains Area, Fremont and Custer Counties, Colorado Theodore J. Armbrustmacher and Carl...Carl E. Hedge US Geological Survey, Denver, Colorado 80225, USA Abstract. Concentrations of Rb, Sr, and...alkaline complexes in the Wet Mountains area, Colorado, show that rocks formed as end-products of a variety...nepheline syenite and hornblende-biotite syenite in the McClure Mountain Complex, nepheline syenite pegmatite...the Gem Park Complex, and quartz syenite in the complex at Democrat Creek. The nepheline syenite and |  | | Report (issue) | | in the Wet Mountains Area, Custer and Fremont Counties, Colorado GEOLOGICAL SURVEY PROFESSIONAL PAPER...in the Wet Mountains Area, Custer and Fremont Counties, Colorado By THEODORE J. ARMBRUSTMACHER GEOLOGICAL...of rocks of the McClure Mountain Complex, Gem Park Complex, and complex at Democrat Creek and associated...in the Wet Mountains area, Custer and Fremont Counties, Colorado. (Geological Survey Professional Paper...16:1269 1. Alkalic igneous rocks. 2. Petrology Colorado Wet Mountains. I. Title. II. Series. QE462.A4A76 |  | | Report (issue) | | beryl production from the Harding pegmatite, Taos County. Current drilling in the Apache Warm Springs deposit...were discovered in the Victorio Mountains, Luna County in the early 1900s. Gulf Minerals Resources, Inc...also is found in the nepheline syenite at Wind Mountain, Otero County and in the molybdenum porphyry...porphyry deposit at Questa, Taos County, although not in economic concentrations. Tertiary rhyolites from Iron...(blue) in the area (defined by McLemore, 2010a). Red line is boundary of Alamosa basin. Major granitic-rhyolite |  | | Report (volume) | | The cover depicts a crystal of the mineral zircon (ZrSi0 4 ), which is contained by most igneous rocks...relatively high concentrations of uranium and thorium, zircon is commonly used for isotopic dating. Artwork by... and Stanley H. Evans, Jr. 1 B. Uranium-lead zircon ages and common lead measurements for the Archean...sedimentary rocks of the Espanola basin, Santa Fe County, New Mexico, by Glen A. Izett and C. W. Naeser... Geochronology of basement granite, Stephenson County, Illinois, by ZellE. Peterman, S. S. Goldich, Lynn |
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