 | | 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) | | Associated Carbonatites of the Gem Park Complex, Custer and Fremont Counties, Colorado GEOLOGICAL SURVEY PROFESSIONAL...ASSOCIATED CARBONATITES OF THE GEM PARK COMPLEX, CUSTER AND FREMONT COUNTIES, COLORADO S a n g re d a C r...,,'*^ ,,' -aCr* Gem Park, Colo. View northwestward from Democratic Mounta GEM MOUNTAIN Sawatch Range...-Cbtrfplex ving pyroxenite and gabbro of the Gem Park Complex. -« "*» +** 4ifa. Mafic-Ultramafic Igneous...Associated Carbonatites of the Gem Park Complex, Custer and Fremont Counties, Colorado By RAYMOND L. PARKER and |  | | 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...the McClure Mountain Complex, nepheline syenite pegmatite in the Gem Park Complex, and quartz syenite...syenite in the complex at Democrat Creek. The nepheline syenite and hornblende-biotite syenite at McClure Mountain |  | | Journal (article/letter/editorial) | | Canada;Iron Hill, Powderhorn district, Colorado;and covered. GemPark,Colorado(Fig. 1). Althoughthe four study...Similarly, the HOH-bending vibration district,Colorado;O -- Oka Carbonatite,Quebec,Canada. mode,coupledwith...Procedures IH = Iron Hill, Powderhorn district, Colorado; GP = Gem Park 1984). Manyrock-forming mineralshavebroadabsorption...Fe+2andFe+3(HuntandSalisbury, 1970). Geological Survey, Denver, Colorado; and from Electronicabsorption processes alsoare...Biotite, microcline,hornblende} augRe,rutlie Oka Complex,Quebec (Gold, 1969, p. 49-50; Gold andVallee, 1969 |  | | Book | | Lengai natrocarbonatite volcano and the Ilimaussaq complex, but comparative studies on alkaline rocks have...other hand many occurrences are so extensive and complex that the descriptions will only be adequate to...Deloro stock 1 0 1 Sulli vc1n Island 102 K i pawa complex and Lake Tortue 103 Northwestern Quebec dykes 1...Baie-des-Moutons 1 59 K i n g ' s Point 1 60 La Scie complex otre Dame Bay area 161 1 62 Topsails 163 H a re...marbles of Lower Palaeozoic age, or older. The complex consists of an outer zone of quartz monzonite and |  | | Report (issue) | | ...................... . Powderhorn District, Colorado ................. . Mountain Pass, California...Area, Colorado ................ . Bearpaw Mountains, Montana ................. . Ravalli County, Montan81-...Montan81- Lemhi County, Idaho .. Magnet Cove and Potash Sulfur Springs, Ar· kansas ........................Bearpaw Morntains, Mont.; (5) Ravalli County, Mont., and Lemhi County, Idaho; and (6) Magnet Cove-Potash...one such area, the Dismal Swamp placer in Elmore County, 10 EXPLANATION I 3 1 1 1 1 1 Placer locality |  | | Report (issue) | | Peninsula, Mich. 10. Porphyry molybdenum ore, Colorado 11. Zinc ore, Edward, N. Y. 12. Manganese nodules...a low silica content. These rocks represent a complex sequence of alkalic rocks that were intruded into...an oval-shaped body of intrusive rock in Crook County, Wyo. This area makes up the higher part of the...the margins of the area, they are lumped as one complex unit in the central part of the region. The fieldwork...WYOMING samples. The principal mafic mineral is aegirine-augite, which may make up as much as 20 percent of |  | | Report (issue) | | upper part of the Hanson Creek Formation in Eureka County, Mullens and F. G. Poole . . . . . . . . . . ....distribution in a granite stock near Bull Canyon, Lemhi County, Idaho, by M. H. Staatz, C. M. Bunker, and C. A...Thomas, Keg, and Desert calderas, central Juab County, Utah, by D. R. Shawe 43 51 57 67 Petrology and...reconstituted rocks of Mule Ear diatreme, San Juan County, Utah, by R. A. Cadigan and D. E. Stuart-Alexander...nitrate in ground water and streams, southern Nassau County, Long Island, N.Y., by N. M. Perlmutter and Ellis |
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