 | | Report (issue) | | Sequence Along Coal Creek to Idaho Springs Formation Front Range, Colorado By JOHN D. WELLS, DOUGLAS M...____ Boulder Creek Granite and the quartz monzonite_ __________-__-__---_----_--_-_---_-Boulder Creek...1. Index maps of the Coal Creek area, Eldorado Springs, Ralston Buttes, and Blackhawk quadrangles..-_________...alinements in andalusite and cordierite. 12 4. Triangular diagram of Boulder Creek Granite.______________________...SEQUENCE ALONG COAL CREEK TO IDAHO SPRINGS FORMATION, FRONT RANGE, COLORADO By JOHN D. WELLS, DOUGLAS M |  | | Report (issue) | | Geology of Precambrian Rocks Central City District Colorado GEOLOGICAL SURVEY PROFESSIONAL PAPER 474-C Prepared... Geology of Precambrian Rocks Central City District Colorado By P. K. SIMS and D. J. GABLE SHORTER CONTRIBUTIONS...1918Geology of Precambrian rocks, Central City district, Colorado, by P. K. Sims and D. J. Gable. Washington, U...district, Colorado. 1964. (Card2) 1. Geology, Stratigraphic Pre-Cambrian. 2. Geology Colorado Gilpin Co...________________ Amphibolite__ _ -__---__-______________. Cordierite-amphibole gneiss_______________ Calc-silicate |  | | Report (volume) | | Part of the Morrison Quadrangle Jefferson County, Colorado GEOLOGICAL SURVEY BULLETIN 1251-E Geology...Part of the Morrison Quadrangle Jefferson County, Colorado By D. J. GABLE CONTRIBUTIONS TO GENERAL GEOLOGY...rocks along the mountain front due west of Denver, Colorado UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON...gneiss and amphibolite._________________________ Cordierite-bearing biotite gneiss_____________________________...Amphibolite in hornblende gneiss _________________ 4. Cordierite-bearing biotite gneiss and associated rocks. |  | | Journal (article/letter/editorial) | | SOME MINERAL OCCURRENCES IN THE GUFFEY REGION, COLORADO* Jeuos E. Bnven, []niversity of Michigan, Ann...north-central Fremont County and southeast Park County in the Front Range of central Colorado. Its center is...those which have been correIated with the Idaho Springs formation and closely associatedmigmatite. Cord.ierite:Sterrett...ierite:Sterrett (1923) recognized cordierite in the Climax pegmatite, which is one of the main deposits...pp. 43-45) and Heinrich (1950) discussed the cordierite occurrencein detail, including its extensive |  | | Report (issue) | | Metamorphism of Some High-Grade Cordierite Gneisses, Front Range, Colorado Dolores J. Gable U.S. Geological...SOCIETY OF AMERICA, INC. Colorado Building P.O. Box 1719 Boulder, Colorado 80302 Printed in the United.............. . Distribution and occurrence of cordierite .............................................................. . Stratigraphic relations of cordierite-bearing gneiss .................. .............chemical composition of cordierite-bearing gneisses ................... . Cordierite-bearing biotite gneiss |  | | Report (volume) | | Geology of the Eldorado Springs Quadrangle Boulder and Jefferson , Counties, Colorado C_-J / By JOHN D. WELLS...__________________________ Boulder Creek Granodiorite__________________________ Inclusions in the Boulder Creek Granodiorite_________...Sandstone_____--__--__-_-___---____________ Lykins Formation.__________________________________ Mesozoic r...rocks__________________________________________ Ralston Creek Formation.. __________________________ Morrison Formati...ILLUSTRATIONS Page PLATE 1. Geologic map of the Eldorado Springs quadrangle..___.__In pocket FIGURE 1. Index map |  | | Report (issue) | | Crystalline Rocks, Park and Jefferson Counties, Colorado GEOLOGICAL SURVEY PROFESSIONAL PAPER 608-B General...Crystalline Rocks, Park and Jefferson Counties, Colorado By C. C. HAWLEY and R. A. WOBUS GEOLOGY AND ORE...TARRYALL REGION, PARK AND JEFFERSON COUNTIES, COLORADO GEOLOGICAL SURVEY PROFESSIONAL PAPER 608-B...Tarryall region, Park and Jefferson Counties, Colorado) (Geological Survey Professional Paper 608-B)...Stratigraphic Pre-Cambrian. 2. Geology-Colorado Park Co. 3. Geology Colorado Jefferson Co. 4. GraniteColorado |  | | Report (issue) | | Washington Zinc ore, Friedensville, Pa. Banded iron-formation, Palmer, Mich. 6. Ribbon asbestos ore, Quebec...Peninsula, Mich. 10. Porphyry molybdenum ore, Colorado 11. Zinc ore, Edwards, N.Y. 12. Manganese nodules...ocean floor 13. Botryoidal fluorite ore, Poncha Springs, Colo. 14. Tungsten ore, North Carolina Rutile...Gneiss and Related Rocks, East-Central Front Range, Colorado By SHERMAN P. MARSH and DOU1GLAS M. SHERIDAN GEOLOGY...and geochemical study of rutile-bearing rocks in Colorado and a description of their occurrence elsewhere |  | | Journal (article/letter/editorial) | | underlying Gilpin County, Colorado, and adjacent parts of Clear Creek and Boulder counties are of pre-Cambrian...pre-Cambrian age. The Idaho Springs formation, a quartz biotite schist of sedimentary origin, is really...Geology of Gilpin County and Adjacent Parts of Clear Creek and Boulder Counties, Colorado," U.S. Geol. Surv...resembling tillite. The St. Joe-Clearwater2 region of Idaho, comprising about 250 square miles, lies about 30...The base on which they rest is not exposed. The formation of this area which is correlated with the St. |  | | Report (issue) | | METAMORPHIC ROCKS OF THE CENTRAL FRONT RANGE. COLORADO By Dolores J. Gable ' Edited bv William. D............................................. 12 Cordierite-garnet-gedrite-biotite gneiss...................................... 12 Cordierite-biotite-quartz-plagioclase and cordierite-garnet-biotite gneiss.............................................. 14 Cordierite-sillimanite-biotite gneiss ............................................................. 14 Cordierite-magnetite-sillimanite-biotite gneiss and mag |  | | Journal (article/letter/editorial) | | The Johns Hopkins University, Baltimore, MD 21218, USA Abstract. Monophase negative-crystal shaped CO2...1700 m.y.-old migmatites from the east-central Colorado Front Range. They are, however, quite rare in...the scale of a few centimeters suggest that the formation of these inclusions was related to the migmatization...crusts. The importance of fluid in migmatite formation, however, has long been apparent. Because partial...partial melting seems to be responsible for the formation of a majority of migmatites (for example, Johannes |  | | Journal (article/letter/editorial) | | its own structure rather than permitting their formation as separate grains (Rogers,1961). RBsur,rs On...samplesinclude: Idaho Springs Formation (2) and Mt. Morrison Gneiss (2), Front Range, Colorado; Pellisier...Roan Mountain complex, North Carolina; Valley Springs Gneiss (3), Texas; and a metasomatized(?) schist...by investigatingmetacrystsin two sectionsof the Idaho SpringsFormation. Photomicrographswere made of 10...VOL 53, JANUARY FEBRUARY, 1S68 STAINING FOR CORDIERITE AND FELDSPARSIN THIN SECTION1 SyracuseUn'i'aersity |  | | Report (issue) | | Geology and Ore Deposits of the Front Range Colorado By T. S. LO\'ERING and E. N. GODDARD GEOLOGICAL...in cooperation with the Colorado State Geological Survey Board and the Colorado Metal Mining Fund ~ oopr...Metamorphic rocks ________________________ _ Idaho Springs formation _______________ _ Swandy ke hornblende..._ Quartz diorite and associated hornblendite_ Boulder Creek granite _________________ _ Pikes Peak granite...stratigraphic relations __ Fountain formation ________________ _ Ingleside formation ________________ _ Lyons sandstone |  | | Journal (article/letter/editorial) | | Childs Mielenz, Bureau of Reclamation, Denver, Colorado Werner Nowacki, Universitiit, Bern, Switzerland...Nevada. PETROLOGY OF THE GIIFFEY-MICANITE RXGION, COLORADO university ^iiff-'"l; lll'i.l.., "t Michigan...southeast part of Park County and in the north-central part of Fremont County, Colorado, is underlain chiefly...The preCambrian rocks include: (1) The Idaho Springs formation, which consists of mica schists and gneisses...Fe-Mn phosphates, magnetite, bismutite, beyerite, cordierite-pinite, sillimanite, monazite, and uranothorite |  | Collins, Donley S., Cobban, Robert R., Foord, Eugene E., Murphy, Jack A. (1989) Bibliography for update and revision of U.S.G.S. Bulletin 1114, Minerals of Colorado -- a 100 year record, by Edwin B. Eckel, Part A - Paper copy --Bibliography data file disks. Open-File Report Vol. 1989 (89-206) US Geological Survey doi:10.3133/ofr89206a | Report (issue) | | Survey Denver, Colorado Department of Geology, Denver Museum of Natural History Denver, Colorado NOTE FOR...revision of U.S.G.S. Bulletin 1114, Minerals of Colorado A 100 year record, by Edwin B. Eckel By Donley...Prepared in cooperation with Friends of Mineralogy - Colorado Chaptar, and the Denver Museum of Natural History...references dealing with the mineralogy of the state of Colorado. It is part of a more than 10 year effort to update...and revise U.S.G.S. Bulletin 1114, Minerals of Colorado: A 100 year record, by Edwin B. Eckel (1961). |  | | Report (volume) | | Eureka Gulch Area Central City District Gilpin County Colorado GEOLOGICAL SURVEY BULLETIN This report concerns...Eureka Gulch Area Central City District Gilpin County Colorado By P. K. SIMS, F. W. OSTERWALD, and E. W. TOOKER...OF CLEAR CREEK, GILPIN, AND LARIMER COUNTIES, COLORADO GEOLOGICAL SURVEY BULLETIN 1032-A This report...silicate gneiss___________________________ _________ Cordierite-anthophyllite-garnet gneiss. _______________________...23 24 27 29 31 IV GEOLOGY AND ORE DEPOSITS, COLORADO ILLUSTKATJONS PLATE 1. Geologic maps of the Eureka |  | | Report (issue) | | Basement in Colorado GEOLOGIC A I, Rock Units of the Precambrian Basement in Colorado By OGDEN TWETO...TWETO GEOLOGY OF THE PRECAMBRIAN BASEMENT IN COLORADO U.S. GEOLOGICAL SURVEY PROFESSIONAL PAPER 1321-A...igneous rocks in outcrop and the buried basement in Colorado UNITED STATES GOVERNMENT PRINTING OFFICE...1912-1983 Rock units of the Precambrian basement in Colorado. (Geological Survey Professional Paper ; 1321-A)...Geology, Stratigraphic Pre-Cambrian. 2. Geology Colorado. QE653.T9 1986 551.7'1'09788 I. Title. For sale |  | | 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 |  | | Journal (article/letter/editorial) | | THE CHIEF LITHIUM PEGMATITE, DEVILS HOLE, FREMONT COUNTY, COLORADO1 E. Wu. HnrNnrcu eNo Rrcnann W. VraN...) . and chemicals corporation in canon city, colorado. However, Iithium minerals were rumored to have...schistsof the Idaho Springs formation: hornblende gneiss' calc-silicate gneiss, cordierite gneiss, qttartzite...Geologic map of the Chief pegmatite' Devils Hole, Colorado' gradational contacts with wali-zone rock. In... oF THE RBcroN Lithium pegmatitesare rare in Colorado,indeed in the entire Rocky asMountain belt from |  | | Report (issue) | | GEOLOGICAL SURVEY Locatable Mineral Reports for Colorado, South Dakota, and Wyoming provided to the U.S.............................................. 1 COLORADO ................................................San Isabel and White River National Forests Lake County Land Exchange Offer (Iocmin40) .................................. 138 FIGURES OR ATTACHMENTS COLORADO Pike National Forests Shepard and Associates Land...National Forests Lake County Land Exchange Offer 1. Exhibit A: Property that Lake County will consider exchanging |  | | Journal (article/letter/editorial) | | BEARING VEINS, CENTRAL CITY DISTRICT, GILPIN COUNTY, COLORADO • PAUL K. SIMS CONTENTS PAGE Abstract...sulfide-bearingquartz veins in the Central City district, Colorado,within the mineral belt of the Front Range. The...0 104ø tO•ø 50 Miles FIGUREI.-INDEX MAP OF COLORADO SHOWINGLOCATION OF CENTRAL CITY DISTRICT. PARAGœN...CentralCity districtis in the core of the Front Rangeof Colorado• a complexof Precambrianmetamorphicand igneousrocks...Quartz monzonite gneiss Probably equivalent to Boulder Creek granite of Lovering and Goddard (13). Also |  | | Journal (article/letter/editorial) | | by BRUCE R. DOE U.S. Geological Survey, Denver, Colorado INTRODUCTION T H E isotopic composition of lead...within an individual magmatic complex such as the Boulder batholith, and by at least one isotope ratio that...shallow. A large triangular region comprising the Colorado Plateau and the Basin and Range province has not...No. in Appendix A 18-355 15-76 15-62 18-377 Idaho 37-68 15-58 18-364 38-80 38-26 38-48 38-57...0-37 Pb I0> /Pb !0< 17-940 17-770 18090 18-742 Colorado 19156 19-508 19124 18-980 18-908 18-895 18-920 |  | Sheridan, Douglas M., Maxwell, Charles Henry, Albee, Arden Leroy, Van Horn, Richard (1967) Geology and uranium deposits of the Ralston Buttes district, Jefferson County, Colorado, with sections on Paleozoic and younger sedimentary rocks. Professional Paper 520. US Geological Survey doi:10.3133/pp520 | Report (issue) | | Deposits of the Ralston Buttes District Jefferson County, Colorado By DOUGLAS M. SHERIDAN, CHARLES H. MAXWELL...Igneous rocks _________________________ ___ _ Boulder Creek Granodiorite _____________._ Quartz monzonite...___ _ ~ Pennsylvanian and Permian: Fountain Formation ___________________________ _ Permian: Lyons Sandstone..._____________ _ Permian(?) and Triassic(?): Lykins Formation ____________________ --· ___ _ Mesozoic rocks...________________ _ Ralston Creek Formation ___________ _ Morrison Formation _______________ _ Cretaceous |  | | Report (issue) | | carbonate replacement ores of the Drum Mountains, Juab County, Utah, by T. S. Levering, J. H. McCarthy, and Irving...Thortveitite associated with fluorite, Ravalli County, Mont., by R. L. Parker and R. G. Havens __-____-__-____...fluorine in mineralized tuff, Spor Mountain, Juab County, Utah, by W. R. Griffitts and L. F. Rader, Jr....Dawson County, Ga., by J. W. Stewart---___-_---_---_----_-------------_----------10. Cordierite-bearing...in Precambrian rocks, Central City quadrangl -, Colorado, by P. K. Sims and D. J. Gable...._______..___ |  | | Journal (article/letter/editorial) | | of COLORADO ED RAINES Geology Museum Colorado School of Mines 1310 Maple Street Golden, Colorado 80401...Ouray County. Raines-Pettem collection, photographer unknown. B etween 1868 and 1922, Colorado produced...with another 50 million pounds mined in San Juan County (Henderson 1926). During the twentieth century...mined (Beaty, Landis, and Thompson 1990). Total Colorado production prior to 1958 reached 585 million pounds...copper; Colorado mined gold, silver, lead, and zinc. Nearly all of the copper produced in Colorado has been |
|
