 | | Report (issue) | | Geology and Ore Deposits of the Cuyuna North Range Minnesota GEOLOGICAL SURVEY PROFESSIONAL PAPER...407 Geology and Ore Deposits of the Cuyuna North Range Minnesota By ROBERT GORDON SCHMIDT GEOLOGICAL...1924Geology and ore deposits of the Cuyuna North range, Minnesota. Washington, U.S. Govt. Print. Off....87-91. l.Geology Minnesota Cuyuna North range. 2.Ore-deposits Minnesota Cuyuna North Range. S.Iron ores Minnesota...Minnesota Cuyuna North range. I.Title: The Cuyuna North range, Minnesota. (Series) For sale by the Superintendent |  | | Journal (article/letter/editorial) | | 1965 IRON PHYLLOSILICATES OF THE CUYUNA DISTRICT IN MINNESOTA R. L. Bre.rB, Minneapolis Metallwrgy...of the Trommald iron-formation in the Cuyuna district, Minnesota, showed the following minerals in order...order of decreasing abundance: Mn-Mg-siderite, stilpnomelane, minnesotaite, magnetite, quartz, two unidentified...destroyed primary layering. Three samples of stilpnomelane and one of minnesotaite were concentrated from...diffraction and difierential thermal analyses. Stilpnomelane samples gave a distinct ammoniacal odor when |  | | Report (issue) | | GEOLOGY OF THE CUYUNA DISTRICT, MINNESOTA: A PROGRESS REPORT UNIVERSITY OF MINNESOTA MINNESOTA GEOLOGICAL...DIRECTOR BULLETIN 36 The Geology of the Cuyuna District, Minnesota A PROGRESS REPORT BY FRANK F. GROUT...WOLFF, SR. MINNEAPOLIS· 1955 THE UNIVERSITY OF MINNESOTA PRESS PRINTED AT LUND PRESS, INC., MINNEAPOLIS...mines of the Cuyuna district in considerable detail. About 1940 a brief synopsis of Cuyuna geology was...the University of Minnesota. In 1941 Mr. Grout started active field work on the Cuyuna largely in connection |  | | Journal (article/letter/editorial) | | in manganese-rich iron-formation, Cuyuna Iron Range, Minnesota, USA PETER L. McSWIGGEN, G. B. MOREY AND...CLELAND Minnesota Geological Survey, 2642 University Avenue, St. Paul, Minnesota 55114, USA Abstract...on the North range segment of the Early Proterozoic Cuyuna Iron Range of east-central Minnesota has shed...Proterozoic manganiferous iron ores of east-central Minnesota casts doubt on the historic interpretation of...and Sr-rich baryte veins elsewhere in the Cuyuna North range. KEVWOROS: hyalophane, Ba-feldspar, iron-formation |  | | Journal (article/letter/editorial) | | States are in the Lake Superior region, in Minnesota, Wisconsin, and Michigan. Thinner units occur...iron-formation stratigraphy,however, differ greatly from one range to another; it is likely that each area of iron-formation...contemporaneous sediments. The iron-formations range in thicknessfrom about 100 feet to more than 2,000...content of unoxidized rock typically is in the range of 25 to 35 percent. Beds of iron-formation as much...oœthe separaterangesin Montana, State Surveysof Minnesota,Wisconsin,and Michi"Geologyof the Wyoming, and |  | | Journal (article/letter/editorial) | | Springer-Verlag 1971 Phase Relations of Biotite and Stilpnomelane in the Greenschist Fades EDWIlq H . :BRowN Western...1971 Abstract. Phase relations of biotite and stilpnomelane and associated silicate minerals have been studied...from Scotland, Minnesota-Michigan iron range, and northwest Washington. That stilpnomelane in the greenschieht...experiments, and phase relationships. Alteration of stilpnomelane after metamorphism not only oxidizes iron but...effects must be made in using analyses of brown stilpnomelane in studies of phase relations. Two discontinuous |  | | Journal (article/letter/editorial) | | variety of volcanic and sedimentary rock types and range in thickness up to a b o u t 300 m (Table I). SVOP-IF...(Markland, 1966). SVOP-IF displays the greatest range in silica content among classified iron-formation...Canada Sweden Sweden USSR Canada Canada Canada USA 1 2 3 4 5 6 7 8 9 iO ii 12 >60 24 ...9 Helen, iO Outerring; Precambrian !~7:ii Pickle Crow; {$iddle-Late Precambrian W: 12 Soudan B2 AI ...6 .... 19 USA 230 Cg,fLs Mn,Gn,St Cht,Cal 46 4 0.90 18.7 19.7 0.63 2.98 20 USA 153 sMu,tMu |  | | Report (issue) | | BIBLIOGRAPHY OF MINNESOTA 1951-1980 GEOLOGY ves ai é Lita: ae i if “Pe va MINNESOTA GEOLOGICAL...DIRECTOR BULLETIN BIBLIOGRAPHY SURVEY 46 OF MINNESOTA GEOLOGY 1951-1980 COMPILED G.B. MOREY, NANCY...NANCY BY BALABAN, AND LYNN Gn UNIVERSITY OF MINNESOTA ST. PAUL e 1981 SWANSON ISSN 0076-9169 @...@ ISBN 0-934938-01-6 The University of Minnesota is committed to the policy that all persons shall have...bibliography brings Minnesota Geological Survey Bulletin 34, ‘‘Bibliography of Minnesota Geology,’’ by T |  | | Journal (article/letter/editorial) | | amphiboles __+ rhodonite __+ hyalophane __+ Mn stilpnomelane -t- ilmenite. The Mn amphiboles are identified...gondites point to metamorphic conditions in the range of 450-500~ at 2 - 3 kbar. KEYWORDS" gondite, manganese...In Ghana, six parallel greenstone belts trending north to northeast are recognized. The Nangodi belt in...postdates cryptomelane. The compositions of white micas range from ordinary muscovite (MgO and FeO < 2 wt.%, MnO...(Tir)* Dannemorite (Dan)* Manganophyllite (Mph)* Stilpnomelane (Stilp)* Parsettensite (Pars)* Hyalophane (Hyal)* |  | | Report (issue) | | glauconite.________ 6. Analyses of minnesotaite, stilpnomelane, 8 thuringite, and bavalite_ _________ 7. Values...Occurrences of iron-rich beds of Precambrian age 23. North and South America,. 34 24. Europe and Asia__--___--_36...depositional or diagenetic origin, have a wide range of physical and chemical properties, in part because...hematite, and magnetite; siderite, with a substantial range in amounts of manganese, magnesium, and calcium...thuringite and other chlorites); minnesotaite, and stilpnomelane; and pyrite and marcasite. Many of these minerals |  | | Journal (article/letter/editorial) | | paleoenvironmental more recently been named Algoma type in North typesand three intermediatesare differentiatedin...irregular ironstone. Oolitic texture is common in North green patchescontaining20 percent Fe. Its basal...Precambrian MECS Uda SCOS Roper River SCOS Constance Range SVOP Per Geijer-Kiruna SVOP Kiirunavaara-Kiruna...DWAT Savant Lake INT2 Lake St. Joseph SVOP Pickle Crow INT3 Seminoe INT3 Nova Lima SVOP Soudan MECS Cascade-Mozaan...46, 63*, 135 160', 186 14, 90, 189' MECS Bong Range Middle PrecambrianW 55*, 77, 171 • Acronymsfor |  | | Journal (article/letter/editorial) | | Greenland), they are part of Archean cratons and range in age from about 3.5 until 2.5 Ga. Their overall...deformation of extensive BIFs of the Hamersley Range of Western Australia and the Transvaal Supergroup...the dolomite-ankerite series), greenalite, stilpnomelane, and riebeckite, and locally pyrite. Minnesotaite...(ranging from 43 to 56 wt%). CaO and MgO contents range from 1.75 to 9.0 and from 1.20 to 6.7 wt%, respectively...in the evaluation of rock types that reflect a range in Fe content (from ferruginous to Fe-rich) all |  | | Report (volume) | | '"fhe Marquette Range Super~oup in the . G0gebic Iron District, Michigan and Wisconsin GEOLOGICAL SURVEY...Department of Natural ResourceS! The Marquette Range Supergroup in the Gogebic Iron District, Michigan...Data Schmidt, Robert Gordon, 1924The Marquette Range Supergroup in the Gogebic iron district, Michigan...---------------------------Strata of Marquette Range Supergroup-----------Chocolay Group------------...degrees Fahrenheit ~ ~ l:%j ~ 00 THE MARQUETTE RANGE SUPERGROUP IN THE GOGEBIC IRON DISTRICT, MICHIGAN |  | | Journal (article/letter/editorial) | | greenalite,stilpnomelane,minnesotaite,siderite,and ankerite. Fe shalescontain chamosite, stilpnomelane, siderite...to attempt to posed lithologies, display a wide range in take into accountthe modificationcausedby metametamorphicgrade...tablesandfigures.1, WestWeld Range;2, CentralWeld Range;g, EastWeld Range;4, Hill 50 Gold Mine; 5, Koolanooka;...Clackline;12, Mt. Bakewell;15, Johnston Range;14, Trough Well; 15, North Range,Kooyanobbing; 16, CorinthianGold...which20 to 40 vol.percentismaghole$, centralWeld Range(Fig. $), illustratesfea- netiteoccurringin 1-to |  | | Book | | G.B. MOREY Minnesota Geological Survey, 1 6 3 3 Eustis Street, St. Paul, Minnesota 55108, U.S.A. .... . . . . . . . . . . . . . Iron-formations of north-central Wisconsin . . . . . . . . . . . . . . ....the term and gave it an unchallenged position in North American literature; he included in the term “all...volcanic, or metasedimentary rocks”. The local Minnesota name “taconite”, earlier used as a synonym of...which would have been called “iron-formation” in North America (e.g., Wagner, 1928). While Beukes (1973) |  | | Journal (volume) | | of the Pic de Fon Iron Oxide Deposit, Simandou Range, Republic of Guinea, West Africa I. L. Cope, J....Brief History of High-Grade Iron Ore Mining in North America (1848-2008) Philip E. Brown 361 Part IV...four sheets at a 1:100,000 scale in the Espinhaço Range and has worked widely in Brazil and shield South...Mineração Santa Blandina, and Amarillo Gold, on a broad range of commodities, including gold, diamonds, iron,...is professor of economic geology and teaches a range of undergraduate and graduate classes, many with |  | | Journal (article/letter/editorial) | | diameter composed of greenalite, minnesotaite, or stilpnomelane in a matrix of chert or another silicate where...marked and has been noted all over the world: in North America "In general clastic quartz is scarce throughout...weighted distribution; an average of 136 analyses of North American banded iron formations is represented by...for a full account. Environment of Deposition The North American formations were clearly recognized as sedimentary...and ferrous. The total iron is generally in the range of 0.01-0.025 mg/1 (Cooper, 1935). The greater part |  | | Journal (volume) | | of it (drill holes os. 362 and 363) in the area north of Iso Vuorijärvi form the second iron-formation...there occurs a rather narrow wedge trending from north to south (Fig. 2). This wedge is composed mainly...(e. g. 1973) has deseribed the Preeambrian Goe Range iron fo rmati on with horizons relati- vely rieh...from some early iron-rich mineral, probably stilpnomelane. This mineral is common in low-grade ir on formations...Chauvel 1973). Some authors, however, regard stilpnomelane as areplacement product of volcanic ash or volcanoclastic |  | | Journal (article/letter/editorial) | | Department of Marine, Earth and Atmospheric Sciences, North Carolina State University, Raleigh NC 27695-8208...voluminous literature to appreciate either the range of iron-formation characteristics or the conflicting...pure FeC03, alternatively called chalybite stilpnomelane vivianite Column K: Non-ferriferous or weakly...Agbaja+Batati !?ace MEoee Pale LL cret LL cret Tunisi USA USA USA Nigeti 34”16N 32”59N 4O”lf~N 40”23N T”50N 80463...EM SiIu EM Siiu EM Silo EM Silo E Silo USA USA USA USA USA 76 77 78 79 80 scos INT3 SCOS scos SVOP |  | | Book (edition) | | OX5 1 GB, UK 225 Wyman Street, Waltham, MA 02451, USA Copyright © 2015, 2008 Elsevier B.V. All rights reserved...Series A compositional series is defined as a range of mineral compositions in which, for instance,...minimum/maximum values are provided, they show the range found for different optical axes in cases of optical...mineral section. All minerals of a particular colour range are sorted according to their average reflectance...with small specs of cuprite (bluish grey); North Mine (North Broken Hill Mine; NBH Mine), Broken Hill, |  | | Report (issue) | | 501. During fiscal 1963, numerous Federal, State, County, or Municipal agencies listed on page A247 have...____-_---______ Midcontinent area._______________ Minnesota.__________________ Wisconsin__ _ _ ______________...area.____________ Montana ____________________ North Dakota..______________ Wyoming. ___________________...Plateau_-_____--__-____-____--_-_-_-_ Basin and Range region. _______________________ Columbia Plateau..._. Federal agencies.___________________ State, county, and municipal agencies. 247 247 247 U.S. Geological |  | | Report (issue) | | by a study by Ishihara et al. showing that the range in oxidation states of Archean granitoid intrusions...who have contributed to this volume hold a wide range of views about the composition of the early Earth...contributions of the volume. Our sincere hope is that the range of views propounded in this volume will help students...precipitated from fresh water, has been discovered off the north coast of Iceland (Marteinsson et al., 2001; Geptner...cell: The nature and origin of life: Burlington, North Carolina, Neil Patterson Publishers, 275 p. de Zwart |  | | Report (issue) | | Haven, CT 06520 Red Dog Creek, western Brooks Range, Alaska, in 1979, prior to drilling or mining. Ground...from a series of reactions over a wide temperature range and represent at least partial equilibration to...Western Aus- tralia have recrystallized under a wide range of metamorphism, resulting in diverse mineralogy...Complex. Thompson et al. (1984) values in the range of 5 to 20 during equilibration under typical magmatic...and will commonly be toward the lower end of the range. The available natural data indicate a substantial |
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