 | | Report (issue) | | GEOLOGICAL SURVEY PRELIMINARY SCIENTIFIC RESULTS OF THE CREEDE CALDERA CONTINENTAL SCIENTIFIC DRILLING PROGRAM...AND AUTHIGENIC MINERAL DISTRIBUTIONS IN THE OLIGOCENE CREEDE FORMATION, COLORADO, USA By Daniel Larsen...U.S. Government. ABSTRACT The Oligocene Creede Formation represents an exceptionally well-preserved...(CSDP) core provide a record of depositional and mineral-water interaction processes following caldera collapse...authigenic mineral distributions also provide information regarding the role of the Creede Formation in the |  | | Report (issue) | | RECENT MINING DEVELOPMENTS IN THE CREEDE DISTRICT, COLORADO By ESPEK S. LAKSEN ABSTRACT The Creede district...reverse fault in the extreme northern part of the district. Silver in amounts sufficient to stimulate extensive...rich in silver. Some of the tuff beds of the Creede formation are partly altered to bentonite, and the Metalloid...by Emmons and Larsen 1 on the Creede district was completed, the district has produced over $5,000,000...detailed to the work and spent about 10 days in the district in the summer of 192T and 3 days in August, 1928 |  | | Report (issue) | | Bibliography and Index of Colorado Geology 1983 by Atnerican Geological Institute Colorado Geological Survey...Resources Denver, Colorado I 1987 Information Series 21 BIBLIOGRAPHY AND INDEX OF COLORADO GEOLOGY 1983...Geological Institute Colorado Geological Survey Department of Natural Resources Denver, Colorado 1987 The Colorado...opportunity employer. ii BIBLIOGRAPHY AND INDEX OF COLORADO GEOLOGY SERIALS LIST AAPG Bullett n. [Tulsa...the Mineral Industry. New York, NY: Society of Mining Engineers of American Institute of Mining, Metallurgical |  | | Report (issue) | | (Eocene), Cathedral Bluffs area, northwestern Colorado, by J. R. Donnell and A. C. Austin . . . . . ...Clark's Tertiary molluscan types from the Yakataga district, Gulf of Alaska, by W. 0. Addicott, Saburo Kanno...(Refugian) nannoplankton in the Church Creek Formation near Monterey,central California, by E. E. Brahb...• Clinoptilolite-bearing tuff beds in the Creede Formation, San Juan Mountains, Colo., T. A. Steven and...Mineralogy Clay minerals, Longfellow mine, San Juan County, Colo., by R. G. Luedke and J. W. Hosterman .. |  | | Journal (article/letter/editorial) | | Opalitc, Bretz, Cordero, and other minesin the district producedapproximately135,000 flasksof mercurybetween1926...documented.Instead,potassium feldspar,zeolites, montmorillonite,andquartzsuggestintermediateargilliealteration...Silvertoncaldera,Colorado(Mayor and Fisher, 1972); (2) silverdepositsin the Creede Formation,Creede caldera,...Colorado(StevenandEaton, 1975); (3) gold vugsin silicifiedrocks,mineralizationandsilicification in the...the Klondike Mountain Formation, Republic, probablywere essentiallycontemporaneous. None- Washington(Full |  | | Report (issue) | | osphate nodules from the Wills Point Formation, Hopkins County, Tex., by Charles Milton and A. P. Bennison____..._________ The source of travertine in the Creede Formation, San Juan Mountains, Colo., by T. A. Steven...abdophane from a rare-earth occurrence, Valley County, Idaho, by J. W. Adams________________________________...disposal well at the Rocky Mountain Arsenal, Adams County, Colo., by C. T. Wrucke and D. M. Sheridan____...uranium deposits in the southern San Juan basin mineral belt, New Mexico-An hypothesis, by H. C. Grang |  | | Report (issue) | | Geology and Mineral Deposits of the Poncha Springs NE Quadrangle, Chaffee County,Colorado By RALPH E.... 626 Prepared in cooperation with the Colorado State Mining Industrial Development Board UNITED STATES..._________________________ _ Browns Canyon Formation _________________ _ Dry Union Formation ______________________ _ Quaternary...Ralph E. Van Alstine and Doak C. Cox _________ _ Colorado-American mine ______________ -_Delay adit and... Geologic map of the Colorado-American fluorspar mine, Browns Canyon district. Geologic map of underground |  | | Report (issue) | | Goldfield-type vs. Creede-type epithermal deposits. Distinctive characteristics; Goldfield-type & Creede-type deposits...Complex. SW-NE cross section, Summitville mining district, Colorado. After Steven and Ratte, 1960. Schematic...sphalerite crystal from locality NJP-X, OH vein, Creede, Colorado. Fluid inclusion homogenization temperature-salinity...locality NJP-X, OH vein, Creede, Colorado. Longitudinal section, OH vein, Creede, Colorado showing distribution...fluid inclusions in quartz crystal, OH vein, Creede, Colorado. Courtesy, N. Foley. Fluid inclusion homogenization |  | | Report (chapter) | | volcanism: a review R. H. Sillitoe Department of Mining Geology, Royal School of Mines, Imperial College...pre-existing faults; in the San Juan Mountains, Colorado, in particular, earlier fractures related to caldera...regional phenomenon not directly related to vein formation. Alternatively, zones or vein haloes consist of...consisting of sedimentary and intru, sive rocks. Post-mineral volcanic units, particularly felsic tufts, are...comparable with those in the San Juan Mountains, Colorado (see below). Uplift of fault blocks occurred along |  | | Book | | MINES AND MINERALS OF THE GREAT AMERICAN RIFT (COLORADO-NEW MEXICO) Sine —_—< ¢ te om At _SHT 40...MINES AND MINERALS OF THE GREAT AMERICAN RIFT (COLORADO-NEW MEXICO) Richard Walker Holmes and Marrianna...American Rift (Colorado-New Mexico). Bibliography: p. Includes index. 1. Mines and mineral resources—Colorado...resources—Colorado. 2. Mines and mineral resources—New Mexico. I. Kennedy, Marrianna B. II. Title. III. Title: Great...possible steps should be taken to preserve our mineral heritage, whether in physical form as irreplaceable |  | | Report (issue) | | and Ore Deposits ofthe Summitville District San Juan Mountains Colorado By THOMAS A. STEVEN and JAMES C...PAPER 343 Prepared in cooperation with the Colorado Metal Mining Fund Board UNITED STATES GOVERNMENT PRINTING...classification and nomenclature__--.-_------Conejos formation ___________._______L.______-__ Lithology.____..._--___---Illite-kaolinite zone ___________________ Montmorillonite-chlorite zone __________ Supergene alteration...the Summitville district and surrounding areas. Geologic map of the Summitville district, and section showing |  | | Report (issue) | | Lohman_ 125. ~iocene vertebrates of the Barstow Formation in southern California, by G. E. Lewis_________________________...~iguel County, Colo., by F. W. Cater_ 129. A Pleistocene section at Leonards Cut, Burke County, N.C.,...in a volcanic sequence related to the Creede caldera, Colorado, by J. C. Ratte and T. A. Steven ___ ...geochemical prospecting data from the Rocky Range, Beaver County, Utah, by J. J. Connor and A. T. ~iesch_______...part of the Smyrna ~ills quadrangle, Aroostook County, ~aine, by Louis Pavlides and F. C. CanneY---- |  | | Report (volume) | | GEOLOGY OF THE SAN JUAN REGION OF SOUTHWESTERN COLORADO BY WHITMAN CROSS AND ESPER S. LARSEN UNITED...sandstone________________________________________ Morrison formation.______________________________________ Cretaceous...________ Animas formation._________ ____________________________ Torrejon formation.___°____________...___°____________________________________ Wasatch formation._______ ______ _____________________.____ Ridgway till..-..._______ __ __ _-________-__-_'---__--__Blanco Basin formation._______-_ ____________-________---_-_ Volcanic |  | | Report (issue) | | GEOLOGICAL SURVEY PRELIMINARY SCIENTIFIC RESULTS OF THE CREEDE CALDERA CONTINENTAL SCIENTIFIC DRILLING PROGRAM...LOG PROCESSING BOREHOLES CCM-1 AND CCM-2, CREEDE, COLORADO By P. H Nelson J.E. Kibler U.S. Geological...into the Creede Formation and underlying volcanics immediately south and west of Creede, Colorado. Logs...each borehole. INTRODUCTION In support of the Creede drilling project, geophysical logs were acquired...acquired in two boreholes drilled into the moat of the Creede caldera during the autumn of 1991 (see Bethke, |  | | Journal (article/letter/editorial) | | chemistryevolutionand ore depositionin the main-stageCreede, Colorado, epithermalsystem.An extensivegeologic,mineralogic...andhematitewith only minorsulfidesin the central district veins. Boiling ceasedwhen the saturationpressureof...manyresearchers in previousand ongoingstudiesat Creede. Resultsof the calculationsshowthat strongnorthsouthmineralogical...siderite; latebot•oidal pyr•e, marcasite •uthern C•e district • Disseminated • Quartz intrusivelatite mineralization...latebot•oidalpyrite,marc•e Quartz latite ,,::• flow Creede • Formation • Volcanic tuffs, flows Fault- stippledwhere |  | 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 (issue) | | ...................................... Sumpter County.................................................................................... Vallecitos District..................................................................... Armargosa (River Valley) District............................. Other Deposits.................................................. Colorado...................................................................... Meigs-Attapulgus-Quincy District.............................. Twiggs Clay Belt |  | | Report (issue) | | Volcanic Rocks Associated With the Creede Caldera San Juan Mountains Colorado GEOLOGICAL SURVEY PROFESSIONAL...PAPER 524-H Prepared in cooperation with the Colorado Mining Industrial Development Board ASH FLOWS AND...\VITH THE CREEDE CALDERA SAN JUAN MOUNTA~NS COLORADO I I I R esu rgent dome of the Creede caldera....Volcanic Rocks Associated With the Creede Caldera San Juan Mountains Colorado By JAMES C. RATTE and THOMAS...PAPER 524-H Prepared in cooperation with the Colorado Mining Industrial Development Board UNITED STATES |  | | Report (issue) | | Mount Belknap caldera, Utah. USGS Research on Mineral Resources-1987 Program and Abstracts Edited by...lie Sachs Third Annual V. E. McKelvey Forum on Mineral and Energy Resources U.S. Geological Survey Circular...contributions to U.S. Geological Survey programs in mineral and energy resources. Through active exchanges...learned firsthand about the changing needs of the mineral and energy industries, and we found new ways to...to research, development, and administration in mineral and energy resources as a scientist, as Chief Geologist |  | | Report (issue) | | Prepared in cooperation with the Colorado Geological Survey for the United States Department of Agriculture...Service Development of Industrial Minerals in Colorado Circular 1368 U.S. Department of the Interior...Survey Development of Industrial Minerals in Colorado By Belinda F. Arbogast, Daniel H. Knepper, William...John S. Dersch Prepared in cooperation with the Colorado Geological Survey for the United States Department..., 2011, Development of industrial minerals in Colorado: U.S. Geological Survey Circular 1368, 87 p. Library |  | | Report (issue) | | James C. Wright _____ _ 4. Relation of the Colorado mineral belt to Precambrian structure, by Ogden Tweto...__________ _ 5. Pre-ore age of faults at Leadville, Colorado, by Ogden Tweto ____________________________________________...6. Pre-ore propylitization, Silverton caldera, Colorado, by Wilbur S. Burbank _______________________...to caldera subsidence in the Creede district, San Juan Mountains, Colorado, by Thomas A. Steven and James..._________ ·_________________ _ 9. Alinement of mining districts in north-central Nevada, by Ralph J." |  | | Book | | 310 Pillsbury Drive S. E. Minneapolis, MN 55455, USA Volumes 1 to 9 in this series appeared under the...experience and expertise regarding the occurrence and formation of hydrothermal metal deposits. Finally, my thanks...hydrodynamic aspects of ore formation. These advances have, in turn, allowed the formation of more realistic conceptual...are of considerable aid to the exploration and mining geologist in areas of known mineralization, but...limited utility in terms of the search for new mineral districts. The problem of the geographic distribution |  | | Journal (article/letter/editorial) | | accuracy of ages obtained from this often problematic mineral, incremental heating 40Ar/39Ar experiments were...40Ar/39Ar, recoil, Bridger Formation, Wagon Bed Formation, Wind River Formation, EPMA, tephra, tuff, volcanic...Smith et al. 2003). High-K sanidine is the ideal mineral, but in many cases is not available or is contaminated...14# IA (12 of 12) 0.98 47.50 ± 0.14** Name (formation) mineral analysis type location n SUMS (N – 2) ...datum, Twr = Wind River Formation, Tb = Bridger Formation, Twb = Wagon Bed Formation, MI = Multi-crystal |  | | Report (issue) | | Volcanic Rocks, Southeastern SanJuan Mountains, Colorado GEOLOGICAL SURVEY PROFESSIONAL PAPER 852 ...Volcanic Rocks, Southeastern San Juan Mountains, Colorado By PETER W. LIPMAN GEOLOGICAL SURVEY PROFESSIONAL...volcanic rocks, southeastern San Juan Mountains, Colorado. (Geological Survey Professional Paper 852) Includes..."'Early intermediate-composition rocks (Conejos Formation) .. . Vent facies ........................................ . Volcaniclastic rocks (Los Pinos Formation) ............ . Intrusive rocks ............. |  | | Journal (issue) | | trace-element geochemistry of detrital clay and heavy-mineral suites of the lowermost Amazon River: a provenance...late Neogene siliciclastic foundation (Long Key Formation) of the Florida Keys . . . . . . . . . . . . ...Sublacustrine-fan deposition in the Oligocene Creede Formation, Colorado, U.S.A. . .......... . . . . . . . ....Field trip participation preference given to non-USA attendees (1st 25 seats). Accommodations can be arranged...MYROW F.G. BOURROUILH-LE JAN The Colorado College. Colorado Springs. Colorado Uni\ersite Bordeau, I. Talcnce |
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