 | Taylor, Cliff D., Finn, Carol A., Anderson, Eric D., Joud, M. Y., Taleb, M. A., Horton, John D. (2015) Algoma-, Superior-, and oolitic-type iron deposits of the Islamic Republic of Mauritania (phase V, deliverable 83): Chapter O in Second projet de renforcement institutionnel du secteur minier de la République Islamique de Mauritanie (PRISM-II). Open-File Report Vol. 2015 (2013-1280) US Geological Survey doi:10.3133/ofr20131280o | Report (issue) |
| terrane, and (4) the Saouda Group of the Inchiri district. Neoarchean Algoma-type BIF is present in the...Eizzene and Oumachouema Groups of the Inchiri district, (6) the Ijibbitene Group of the Ijibbitene massif........................... 48 5.2.5 The Inchiri district.................................................location of geochronology samples DB07RIM-46a (quartzite in lower member) and DB07RIM-46b (muscovite schist...member of the Tazadit Formation, banded quartz-hematite IF. Location of sample CT07RIM33-1. USGS photo |
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| terrane, and (4) the Saouda Group of the Inchiri district. Neoarchean Algoma-type BIF is present in the...Eizzene and Oumachouema Groups of the Inchiri district, (6) the Ijibbitene Group of the Ijibbitene massif........................... 48 5.2.5 The Inchiri district.................................................location of geochronology samples DB07RIM-46a (quartzite in lower member) and DB07RIM-46b (muscovite schist...member of the Tazadit Formation, banded quartz-hematite IF. Location of sample CT07RIM33-1. USGS photo |
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| CENTRAL MINNESOTA INCLUDING THE CUYUNA IRON-ORE DISTRICT BY E. C. HARDER AND A. W. JOHNSTON MINNEAPOLIS... 23 Descriptions of rock outcrops.............................. 30 Outcrops of silicic igneous rocks.... . . . . . . . . . . . . . . . .... . . . 40 Outcrops of subsilicic igneous rocks. . . . . . . . . ...counties. . . . . . . . . . . . . . . . . . . 52 Outcrops of slate, schist, and other metamorphic rocks...southern St. Louis counties. . . . . . . . 65 90 Outcrops of sandstone and other clastic rocks. . . . . |
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| County . . . . . . . . . . . . · .23 Iron Springs district deposits . . . . . . . . . . . . . . . 23 Location... . . . . 31 9. Size and shape of Iron Springs district intrusions, from outcroppings and geophysical...porphyry, Iron Mountain. . 40 13. Iron-Springs district iron occurrences, Iron County . . . . . . . ....Washington County iron occurrences .84 30 Bull Valley district iron occurrences, Washington County . . . . .... . . .90 31. Pilot iron deposits, Bull Valley district, Washington County . . . . . . . . . . . .93 |
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| ...........................................9 Quartzite conglomerate ............................................................................ 17 Quartzite .............................................................................. 25 Muscovitic quartzite .............................................................................35 5. Sketch of quartzite outcrop showing groups of arcuate layers .......56 6. Sketch of quartzite outcrop showing sigmoidal, recurved, and truncated hematite layers ........ |
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| most part schist and gneiss but also phyllite, quartzite, and crystalline limestone, all strongly folded...alluvial overburden is thin between widespread outcrops, so all the deposits could be mined from open...relief with the exception of several disconnected quartzite ridges. The southern boundary is transitional;...side of the Iguatu basin, the Serra de Moraes, a quartzite ridge, rises above gently rolling country. At...area (pp. 129-132), except the ridge-forming quartzite, underlie the areas of comparatively low relief |
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| INTRODUCTION THE Pre-Cambrian terrain of Singhbhum district in Bihar and its adjoining areas of Keonjhar,...recognition of two distinct orogenic belts in this region and to the suggestion of a new correlation for...TEXT-FIG. 1.—Map showing the location of the Singhbhum region and the generalized structural trends in the Pre-Cambrians...FRAMEWORK OF THE REGION SOUTH OF THE COPPER BELT THRUST (a) Previous Work.—This region is characterized...undoubted Pre-Singhbhum granite metamorphics of this region were included by Dunn and Dey (1942) within their |
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| Geology and Ore Deposits of the Itabira District Minas Gerais, Brazil GEOLOGICAL SURVEY PROFESSIONAL...341-C Geology and Ore Deposits of the Itabira District Minas Gerais, Brazil By JOHN VAN N. DORR 20 and...___________________________ Schists____________________________ Quartzite and meta-arkose(?)_________ Dolomitic schist ...46 47 49 49 50 51 Page Geology of the Itabira district Continued Structure Continued Folds in other ...ores-_________-___-_--_-------------_-_-----_High-grade hematite ores. _____-___-_---_-__----_ Chemical charac |
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| 3Va miles to the inch. Crossesindicate outcrops: Q, quartzite. G, greenstone. S, schist. saw several...fifteenyearsago Mr. Ayersbroughtto the writer samples of quartzite from the north shoreof Dam Lake, which were recognizedas...that county. In the samereport2 the greenstone outcrops in the vicinityof Dam and Long lakesare described...Animikieandprobably cuttingthe quartziteof the region. The Quartziteat Dam Lake.--There is no unequivocalevidenceas...this out-crop is another exposureof the same quartzite. This is on the S. W. ¬, S. E. ¬, sec. 34, T. |
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| PREFACE The barytes deposits of the Cartersville district of Georgia are the most productive in the United...geology and barite deposits of the Cartersville district, Ga.: ·The Tradesman, pp. 35-37, May 22, 1910...in ten days of :field work in the Cartersville district. Georgia continues to lead the states in the production... . . . . . . . . . . . . 17 -1H Oarters·ville district ......................................... 19-125... . . . . . . . . . . . . . . . 22-23 Weisner quartzite ............................ :. . . . . . 23-25 |
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| Keywords: Baraboo interval Dake Quartzite Laurentia The Statherian Baraboo Quartzite (1710–1650 Ma) is present...quartzites outcropping across the southern Lake Superior region. Collectively, these quartzites are known as Baraboo...Baraboo interval stratigraphy above the Baraboo Quartzite in the Baraboo Ranges is unresolved, limiting...unconformity. The lower sequence comprises the Baraboo Quartzite, Seeley Slate, and Freedom Formation. The upper...upper sequence comprises the Dake Quartzite and Rowley Creek Slate. The depositional age of the upper sequence |
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| ________________ Virginia - __ -__ _ ___________ Farmville district, Buckingham, Prince Edward, and Charlotte Counties...schist and gneiss. Kyanite schist _____ Kyanite quartzite ___________ ______________________ Hornblende...deposits Continued Virginia Continued Farmville district, etc. Continued Rock types Continued Other quartzose...localities North Carolina-South Carolina Kings Mountain district, Cleveland, Gaston, and Lincoln Counties, N.C...schist Manganiferous schist Kyanite quartzite Sillimanite quartzite Yorkville quartz monzonite. _._ Diabase |
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| as an intrusive into the Baraboo (Huronian?) quartzite. Cleavelandite dike apophyses in the advancing...type of xenolith. GBNBner-SrerpurNr The Baraboo quartzite is a pre-Cambrian inlier in the Paleozoicstrata...as a well known "canoe shaped" fold (1). The quartzite is probably Huronian in age. On the south margin...granite is shown here to be intrusive into this quartzite. Since this is a controversial question to which...considered the rock as part of the pre-Baraboo quartzite basement. Later Alden (3) quoted Steidtman to |
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| _ Canga_ _-_-_-_--__----_______._____________ Hematite __________________________________ Physiographic...quartz-ankerite rock_ __________________________ Quartzite __________________________ Conglomerate. _____________________...Tamandu& Group..____________t____________ Cambotas Quartzite..___________________ Unnamed formation___________________...Formation. _ _ _ _ Fe~cho do Funil Formation. Tabooes Quartzite. _______ Barreiro Formation. ______ Sabara Formation...Photograph of typical bare outcrops and cliffs of the Cambotas Quartzite in the Serra do Caraga_ _______ |
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| Cambrian dolomite- ____________ Oxide ores in Erwin quartzite. ' _ _ __ Oxide ores in Shady dolomite _ Oxide...__________________ Johnson County ___ ___ _ Shady Valley district _________________________ Reynolds mine________...Continued. Johnson County Continued. Mountain City district ____ __________________ Taylor Valley mine___...Doe Valley mine______________1___________ Butler district ______________________________ Proffit prospe...___'. _ Carter County '. _ __ ________ Butler district _________________ __ _ __________ Elk mine __ |
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| _______________ Chapter D. Geology of the Felch Mountain district, by Carl A. Lamey Introduction. ___________--...Chocolay group___ -----------------------Sturgeon quartzite-___________-----__--Occurrence and characteri...--------------Ferruginous quartz-mica schist and quartzite __________-__-_--------Feldspathic quartz-mica...al metamorphism_ -------------------Sturgeon quartzite.____________-_------Randville dolomite____ --... CONTENTS Chapter D. Geology of the Felch Mountain district Con page Structure _______-__-__________-___--____-_-_-__ |
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| group.__________________________ Conglomerate-quartzite sequence _____ Minas series-_______________________________...-_------------Composition of the ore bodies Microtexture of the hematite.. Origin of the ore__------_--_Soft itabirite__-______-___-__-__...Rubble ore and rolados- _ -----------High-grade hematite ore_ _______-__--_..-___-TaquariL _ _________...__-----__--_-____---__Summary of Aguas Claras hematite deposits ___-___--------_---__----.-_ Fazenda...Summary of the Tamandua-CapitSo do Mato-Serra da Gama region--- ___ Bauxite Brick Clay___ _ _________________ |
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| ----------------------------------'Pyrite and hematite...·------------------------------------------...size........ 26 A. A. Kyanite-impregnated quartzite forming crags on the southwest end of Graves Mountain...section of fresh quartzite from open cut in the saddle of Graves Mountain. Quartzite (qtz) is replaced... B. Thin section of quartzite from the south side of Graves Mountain. Quartzite (qtz) is replaced by...--------- !l6 Sketch of a vertical face of quartzite on the south side of Graves Mountain near the |
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| ---------------------1 72-18 2 FossiL ORES OR HEMATITE ORES-----------------------------------------...operation in the county, the ore, limonite or brown hematite, being taken from deposits in the vicinity or...that have been mined in Georgia are red hematite and brown hematite. Magnetite is known to occur at several...factor in production of iron. At one time red hematite (fossil ore) was produced in considerable quantities...counties. The ore is used chiefly for paint. Brown hematite or limonite has always been an important ore. |
 | Jacobson, Herbert S., Pierson, C.T., Danusawad, Thawisak, Japakasetr, Thawat, Inthuputi, Boonmai, Siriratanamongkol, Charlie, Prapassornkul, Saner, Pholphan, Narin (1969) Mineral investigations in northeastern Thailand. Professional Paper 618. US Geological Survey doi:10.3133/pp618 | Report (issue) |
| visits to villages in the area to locate mineral outcrops or boulders known to the local residents, followed...erosion above an elevation of 300 m where rock outcrops are only slightly weathered, in contrast with...Sandstone, quartzite, phyllitic shale, slate, and limestone. Unnamed Argillite, quartzite, slate, phyllite...rocks including phyllitic shale and sandstone, quartzite, slate, and limestone which were previously included...metamorphism has formed slate, phyllite, argillite, and quartzite. Schist has also been reported (Saurin, 1963) |
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| ___ Karst and related breccias.______________ Hematite concentrations._-____-_--_-____ Metamorphic limestones...unconformity.______---_-___________-.____. Troy Quartzite.____________________________________ Definition..._________________ Lateral variations__._________--__-___-_-_. Quartzite member______________________________ Stratigraphy...87 ILLUSTRATIONS Page FIGURES 1-4. Maps: 1. Outcrops of younger Precambrian rocks in Arizona._____..._______________-____--_------------------2. Outcrops of older Precambrian terrane, showing types of rocks |
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| Deposits of the James River-Roanoke River Manganese District Virginia GEOLOGICAL SURVEY BULLETIN 1008 Geology...·Deposits oftheJatnes River-Roanoke River Manganese District Virginia By GILBERT H. ESPENSHADE GEOLOGICAL...particularly manganese, of the James River-Roanoke River district UNITED STAT.ES GOVERNMENT, PRINTING. OFFICE•...circulation___________________ Relations of the outcrops of the manganese deposits to the upland surface...10. 11. 12. · manganese district, Virginia. showing distribution of quartzite, white marble, mineral deposits |
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| 24W MAP OF TH E GIANTS RANGE GRANITE, POKEGAMA QUARTZITE, AND SURROUNDINGS, MINNESOTA Shows location of...Marquette district....................................... Southern Complex of the Marquette district............................................ Marquette region..................................................minerals of Keweenawan granite and other granites of region........................................................................... Sandstones of Felch district.............................................. |
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| ____________________ 1 U.S. Geological Survey, Western Region Earth Surface Processes Team W904 Riverside Avenue...polygon and arc feature classes, respectively. Each region or route subclass has its own feature attribute...First-order rock units are stored in the rockunit region subclass by grouping related polygons to associate...up a single rock unit. The units stored in this region subclass are the ones shown on the plot-file map...basement, cover, surficial) and stored in additional region subclasses. These subclasses allow the database |
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| . . . . . . . . . . . . . . . . . . LORRAIN QUARTZITE . . . . . . . . . . . . . . . . . . . . . . ....SHEGUIANDAH COSBY TOWNSHIP BAR RIVER BELLEVUE GRENVILLE QUARTZITE . . . . . . . . . . . . . . . . . . . . . . ....writer examined a number of occurrences of Lorrain quartzite along the north shore of Lake Huron. Brief preliminary...occurs commonly as pegmatitic and vein quartz, quartzite, sandstone, and unconsolidated sand. Deposits...quarry, near Whitefish Falls, district of Sudbury, to supply quartzite for flux, and this single operation |
