 | | 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...include nepheline syenite and hornblende-biotite syenite in the McClure Mountain Complex, nepheline syenite...the Gem Park Complex, and quartz syenite in the complex at Democrat Creek. The nepheline syenite and hornblende-biotite |  | | 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...petrology 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 (volume) | | Mafic-Ultramafic Layered Intrusion at Iron Mountain Fremont County Colorado GEOLOGICAL SURVEY BULLETIN 1251-A... Mafic-Ultramafic Layered Intrusion at Iron Mountain Fremont County Colorado By DANIEL R. SHAWE and RAYMOND L...funnel-shaped intrusive complex associated with younger alkalic rocks of the McClure Mountain Complex UNITED STATES...mafic-ultramafic layered intrusion at Iron Mountain, Fremont County, Colo____- ________ In pocket 1. Geologic...McClure Mountain Complex showing location and geologic setting of the mafic-ultramafic complex at Iron |  | | Journal (article/letter/editorial) | | ites fromthe Wet MountainsArea, Fremont and Custer Counties,Colorado TnEOr)ORE J. ARMBRUSTMACHER Abstract...Carbonatites associated with alkalic rocks of the McClure Mountain and Gem Park Complexes, andthecomplex at DemocratCreek...(1.45 b.y.) (Taylor et al., 1975a,b) (Fig. Park Complex(Parker and Sharp, 1970) outlined 1). variousdetailsof...McClure Mountain dikeswere mappedwithin the Iron Mountainmafic- Complex,the Gem Park Complex,and the...the complex ultramaficportion of the McClure Mountain Com- at Democrat Creek. The mafic-ultramaficparts |  | | Report (issue) | | Carbonatites of the Gem Park Complex, Custer and Fremont Counties, Colorado GEOLOGICAL SURVEY PROFESSIONAL...CARBONATITES OF THE GEM PARK COMPLEX, CUSTER AND FREMONT COUNTIES, COLORADO S a n g re d a C r i s... GEM MOUNTAIN Sawatch Range ark -Cbtrfplex ving pyroxenite and gabbro of the Gem Park Complex. -«...Carbonatites of the Gem Park Complex, Custer and Fremont Counties, Colorado By RAYMOND L. PARKER and WILLIAM...GEOLOGICAL SURVEY PROFESSIONAL PAPER 649 The Gem Park Complex its geology and mineralogy, and its niobium distribution |  | | Journal (article/letter/editorial) | | ALKALIC ROCKS OF THE ARKANSAS RIVER AREA, FREMONT COUNTY, COLORADO.4. THE PINON PEAK BRECCIA PIPES1 E. Wru...Assrnecr The Pinon Peakbrecciapipesin Fremontcounty, colorado,are satelriticto the tion are recorded, thus...bodies of the alkalic province of Fremont and custer counties, colorado. The pinon peak breccia pipes, herein...are satellitic to the Mcclure Mountainrron Mountain complex, just as the Democrat creek comprex has marginal...s (3.3 airline miles) from its consanguineous complex, whereasin Democrat Gulch the brecciasare adjacent |  | | Journal (article/letter/editorial) | | (about 19131, Esterbrook copper district, Albany County. John Taylor collection. An ideal and inexpensive...Dyck and Grace Dyck and wus titled “The Sunrise Iron Mine near Hartville, Wyoming”; it appeared in the...Minerals was titled “The Copper Mountain Pegmatite District, Freniont County, Wyoming” and was in the JulylAugust...most notable ones. The localities are listed by county and then in alphabeticnl order. Where numerous...names are from Hausel (1986). Localities by County Albany County Allanite pegmatite, 12 miles W of Bosler |  | | Journal (article/letter/editorial) | | ALKALIC ROCKS OF THE ARKANSAS RIVER AREA, FREMONT COUNTY, COLORADO. 2. FETID GAS FROM CARBONATITE AND RELATED...Michigan. Assrnecr The Goldie carbonatite of Fremont County, Colorado, and its associated rocks contain a fetid...around the Iron Hill alkalic-carbonatitic complex in Gunnison County, Colorado These Colorado occurrences...igneousprovince west and southwestof Canon City, Colorado,have been describedby Heinrich and Dahlem (1965)...1963)lies in the dike halo of the McClure Mountain-Iron Mountain complex, the largest of the three alkalic intrusive |  | | Journal (article/letter/editorial) | | ldbe detectedin amountsaslow as300 ppm. Ferrous iron waspresentin mostdolomiticcarbonatitesamplesand...to sample includingsilicates,phosphates,sulfates,iron oxides, preparation and measurement(Wambeke, 1960)...onlyduringthelast35 years(Deans,1966;Kapustin, Mountain Pass district, California; Oka, Quebec, 1980)...be dis- Canada;Iron Hill, Powderhorn district, Colorado;and covered. GemPark,Colorado(Fig. 1). Althoughthe...Similarly, the HOH-bending vibration district,Colorado;O -- Oka Carbonatite,Quebec,Canada. mode,coupledwith |  | | Report (issue) | | Washington Zinc ore, Friedensville, Pa. Banded iron-formation. Palmer, Mich. 6. Ribbon asbestos ore...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 |  | | Journal (article/letter/editorial) | | this type are principally of quartz, feldspar, and iron oxides and are known from at least 13 widely scatteredareas:...Idaho; (3) Hall Mountain, Idaho; (4) Wet Mountains, Colorado; (5) Powderhorn, Colorado; (6) Laughlin Peak...Cottonwood area, Arizona; (11) Monroe Canyon,Utah; (12) Mountain Pass, California; and (13) Wausau, Wisconsin....are all extremely rare except in the veins at Mountain Pass, which contain substantialamounts of bastnaesite...biotite, chlorite, barite, apatite, and fluorite. Iron oxide minerals, especially limonite and hematite |  | | Book (edition) | | Carbonatites are now the major sources of RE elements (Mountain Pass, California) and of Nb (Oka, Quebec and Araxa...those of the undersaturated alkalic group—the nepheline syenites and their relatives. Rare, mineralogically...Cu, barite, vermiculite, CaCOs;, fluorite, Ti, nepheline, and Zr. HISTORY OF CARBONATITE STUDIES Although...detailed geological survey of the Alné Island complex and announced his results in a series of papers...bodies of limestone intimately connected with the nepheline rocks. Generally the limestone is INTRODUCTION |  | | Report (issue) | | _________________ ___. Nevada ___________ Elko County. - ______ ... _ Star mine, Harrison Pass _____... Tuscarora Range _____ _ ._. ________ Humboldt County Golconda manganese-tungsten depositNorth workings...County__-__--__----__-.___-_-__ Barite deposits, Battle Mountain area.. California-Nevada Barite Co. 63 64 64...naine________________ Mine near Green Talc mine. _____ Nye County ____ _._-___-________-___ Gabbs area __ _____________________..._____ Brucite and magnesite deposits. __ Pershing County __ Rocks in the West Humboldt Range ..~ Limerick |  | | Report (issue) | | tons Be, grade <0.26% Be) to world-class (Spor Mountain, 7,011,000 metric tons, grade 0.266% Be). In New...beryl production from the Harding pegmatite, Taos County. Current drilling in the Apache Warm Springs deposit...known as Spor Mountain Be-U-F or epithermal volcanic-hosted deposit. The Iron Mountain deposit, also...were discovered in the Victorio Mountains, Luna County in the early 1900s. Gulf Minerals Resources, Inc...Beryllium also is found in the nepheline syenite at Wind Mountain, Otero County and in the molybdenum porphyry |  | | Book | | Lengai natrocarbonatite volcano and the Ilimaussaq complex, but comparative studies on alkaline rocks have...amphiboles'. The rocks included are, therefore, the nepheline syenites (phonolites) and ijolites (nephelin...instance, containing normative but not moda.l nepheline, are excluded. However, sometimes these rocks...rocks contain such a high proportion of normative nepheline that it must be present as an occult phase in...other hand many occurrences are so extensive and complex that the descriptions will only be adequate to |  | | Report (volume) | | Minerals of Colorado: A 100- Year Record By EDWIN B. ECKEL GEOLOGICAL SURVEY BULLETIN 1 1 14 A...knowledge____________________________________ Future of Colorado mineralogy______________________________________...mineral localities and metallic mineral deposits of Colorado ________________________________ In pocket III...mineral localities and metallic mineral deposits of Colorado, has not been included in this reprint. Many of...especially Fischer and others, 1946). MINERALS OF COLORADO: A 100-YEAR RECORD By EDWIN B. EcKEL ABSTRACT |  | | Catalog/List | | enlarged photograph of a piece of Obsidian, from Lake County, Oregon, which shows a Conchoidal fracture. t...75 1.00 .60 .60 2:50 (basic calcium, aluminum, iron and cerium orthosilicate Massive; Virginia or N...2.00 .30 .60 .25 .So .60 AMOSITE (hydrous iron magnesium calcium silicate) Shredded; Transvaal...1.50 AMPHIBOLE (Chiefly complex metasilicates of calcium, magnesium and iron) Actinolite Xline, fibrous;.......... .. 1 x 2" .50 2.50 1.50 ARSENOPYRITE (iron sulfarsenide) Xline, high grade; Ontaria, New Hampshire |  | | Report (issue) | | pipes in the Bokan Mountain district of Alaska, carbonatite dikes, and apatite-bearing iron deposits in the................. . Veins and Pipes in the Bokan Mountain District, Alaska ...................................... . 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 ..................... |  | | Report (volume) | | therefore a wide range of colors. Impurities, such as iron, chromium, and copper, also tint the minerals. Care...generally is more easily synthesized than one of complex composition. Although the diamond has the simplest...Del Norte County; Trinity River, Trinity County; Spanish Creek and Gopher Hill, Plumas County; Placerville...Dorado County; Cherokee Flats, Yankee Hill,and Oroville, Butte County; French Corral, Nevada County; Indian...Indian Gulch and Volcano, Amador County; and Alpine Creek, Tulare County. Other western localities are: |  | | Journal (article/letter/editorial) | | JanuaryFebruary: Ferro-axinite on calcite, Dodo mine, Puiva Mountain, KhantyMansi Avt. Okrug, Tyumen’ Oblast’, Russia...quartz, Manhan River mine, Easthampton, Hampshire County, Massachusetts. Marvin Rausch specimen, Jeff Scovil...branch of the Calumet and Hecla mine, Houghton County, Michigan. A. E. Seaman Mineral Museum (Michigan...JulyIAugust: Vanadinite and wulfenite, Old Yuma mine, Pima County, Arizona. Les Presmyk specimen, Jeff Scovil photo...claim, Lake George intrusive center, Teller County, Colorado. Dave Bunk specimen, Jeff Scovil photo. November/December: |  | | Journal (article/letter/editorial) | | MICHAEL J. GOBLA 19055 East Bethany Place Aurora, Colorado 80013 gobla@copper.net Unless otherwise noted...Indian Queen mine ca. 1905 at Farlin, Beaverhead County. 208 ROCKS & MINERALS Downloaded by [University...mines at Butte in Silver Bow County and the Black Pine mine in Granite County have produced many fine crystal...Beaverhead County, the pegmatites of Jefferson County, and the Snowbird mine in Mineral County continue...Highlands Centennial Nugget in 1989 in Silver Bow County. The seventh largest gold nugget found in Montana; |  | | Journal (article/letter/editorial) | | Samuel A. Bowring U–Pb systematics of the McClure Mountain syenite: thermochronological constraints on the...baddelleyite, titanite and apatite from the McClure Mountain syenite, from which the 40Ar/39Ar hornblende standard...54-1116, 77 Massachusetts Ave., Cambridge, MA 02139, USA E-mail: schoene@mit.edu Tel.: +1-617-2530844 Fax:...dating methods. We present data from the McClure Mountain syenite, the source of a widely used standard...standard in 40Ar/39Ar dating, the McClure Mountain hornblende (MMhb; Alexander et al. 1978; Samson and Alexander |  | | Catalog/List | | ....... . 65 ALLANITE (basic calcium, aluminum, iron and cerium orthosilicate) Massive; Virginia, or...South Dakota .................13 AMOSITE (hydrous iron magnesium calcium silicate) Shredded,· Transvaal.....64 AMPHIBOLE (Chiefly complex metasilicatcs of calcium, magnesium and iron) Acti11olite Xline, fibrous... . . . . . . . . . . . 7 APHROSIDERITE (hydrous iron magnesium aluminum silicate) Dodecahedrons of dark...Columbia 1 x 2 ', .60 .......... . 136 ARSENOPYR ITE (iron sulfarscnide) Xli11e, high grade; Ontario, New Hampshire |  | | Catalog/List | | 76 .25 .60 .10 .26 .50 Al\fOSITE (hydrous iron magnesium calcium silicate) Shredded; Transvaal...Quartz AMPHIB'OLE (Chiefly complex metasilicates of calcium, magnesium and iron) Actinolite Xline, fibrous;... ... .... . ... . .. . . . . . .. ARSENOPYRITE (iron sulfarsenide) Xline, high grade; Ontario Rocky;...35 1.00 .15 .35 2.00 .75 AXINITE (acid calcium iron-manganese aluminum boron sili cate) Xline, brown;..... . . ASTROPHYLLITE (a complex hydrous silicate of sodium, potassium, iron, manganese, and titanium) |  | | Journal (article/letter/editorial) | | Childs Mielenz, Bureau of Reclamation, Denver, Colorado Werner Nowacki, Universitiit, Bern, Switzerland...charge and radius. SAIITE AND ACTINOLITE AT IRON MOUNTAIN, MISSOURI* VICTORT. ALI,EN AND JOSEPHJ. TAIIEY...Salite, actinolite, dolomite, and fluorite at Iron Mountain, Missouri, are reported for the first time....series, occurs in a skarn formed by the action of iron-bearing solutions on andeSitic lava of pre-Cambrian...actinolite with 7:1.645' a:1.625; ZAe :15". The iron garnet, andradite (N:1.88)' replaces actinolite |
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