 | | Journal (article/letter/editorial) | | Ophiolite Copper Occurrence ERICH U. PETERSEN Department of Geological Sciences,The University of Michigan...College,Hanover, New Hampshire03755 Abstract The Oxec copperdepositof Upper Cretaceousage lies in the...serpentinitebody that makes up the Sierra de Santa Cruz, Guatemala. Recognitionof the ore host rocks as chloritized...sulfide depositis of the ophiolite copper type. In the mine vicinity, the ultramafic-maficassemblage consistsof...Comparisonwith ocean-floortholeiites indicatesthat the Oxec assemblageis strongly enriched in Na20 and H20, |  | | Journal (article/letter/editorial) | | EVIDENCE FOR FLUID MIXING IN THE OXEC CYPRUS-TYPE COPPER DEPOSIT, GUATEMALA PAULA N. WILSON AND ERICH U...salinity duringformationof the Oxec deposit. GeologicSetting The Oxec copperdeposit,in east-centralGuatemala...Wilson,1974). The ophiolite stratigraphyexposedin the mine area, from bottom to top, iscomposedof a serpen...ascertaintemperatureand salinitychar- sentedby an epidote-albite-chlorite-actinolite-sphene assemblage in...basaltsis almostexclusivelyquartz and chlorite. Oxec systemthan havepreviouslybeen reportedfor The d |  | Hodges, C.A., Cox, D.P., Singer, D.A., Case, J.E., Berger, B.R., Albers, J.P. (1984) U.S. Geological Survey-INGEOMINAS mineral resource assessment of Colombia. Open-File Report Vol. 1984 (84-345) US Geological Survey doi:10.3133/ofr84345 | Report (issue) | | UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL SURVEY U.S. GEOLOGICAL SURVEY-INGEOMINAS MINERAL...(Domain 12). The nearest well-explored deposit, Oxec in Guatemala (Peterson and Zantop, 1980), apparently is...consists mainly of illite, adularia, chlorite, epidote, and calcite. Deposits occur most commonly within...around these deposits characterized by chlorite-epidote-pyrite and Fe-rich carbonates. Using wet chemical...deposits being mined at Cerro Matoso, in the department of Cordoba, contain 2.6 percent Ni, 0.06 percent |  | | Journal (article/letter/editorial) | | ratio):chlorite, hematite, pyrite, quartz, kaolinitc,epidote, paragonitc,magnetite,sphalerite,phlogopite,al-...(chrysotile) great enoughto causesaturationwith epidote. Epidote competeswith chlorite and kaolinitc for A1+•...socauseschloriteto begin dissolving.The ongoingprecipitationof epidote,paragonitc,magnetite,and phlogopiteat a mole rate...> 125, thoseexperimentsdone usingan semblage (epidote-quartz-tremolite-albite-minneso-online sampling...nt quantitiesof calcium-bearingsilicates,like epidote, fail to precipitate (as discussed above). Activity |  | | Report (issue) | | UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL SURVEY U.S. GEOLOGICAL SURVEY-INGEOMINAS MINERAL...Norte Cty, CA Santa Helena, Antioquia, Colombia Goto Mine, Luzan, P.I. References Wells, F. G. et al 1946...Alteration Diopside-hedenbergite+grossular-andradite+epidote. amphibole±chlorite±ilvaite. Late stage Ore Controls...tmorillonite. Igneous rocks may be altered to epidote pyroxene garnet or to potassic and phyllic assemblages...pluton Approximate scale 100 to 500 m Pyroxene + epidote alteration (endoskarn) or potassic/phyllic alteration |  | | Journal (article/letter/editorial) | | volcaniclastic rocks to the overlying chlorite-epidote–altered laminated mudstone of the Thelwood Formation...559 560 JONES ET AL. FIG. 5. Map of the Battle mine, showing the underground sampling sites of siliceous...thick occur in the southern and eastern parts of the mine property, in the South Flank and Thelwood Valley...and the overlying laminated argillite in the HW mine (23 Shop). section, abundant detrital quartz and... Map of the distribution of chert in the Battle mine area in plan view projected to surface (Jones, 2002) |  | | Report (issue) | | UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL SURVEY GEOLOGIC AND GRADE-TONNAGE INFORMATION ON...DOLOMITE OYSCRASITE ELECTRUM EMPLECTITE ENARGITE EPIDOTE FAH LORE FELDSPAR FIBROFERRITE FLUOR ITE FREIBERGITE...HILL ORIJARVI OSBOURNE LAKE OSHIO OSTRA HOGKULLA OXEC PABINEAU RIVER PARONEN PARYS MTN PASUQUIN PATER...Agriculture and Natural Resources and Geological Survey Department, p. 117-128. Adams, R. L., Burton, C. C. J.,...Agriculture and Natural Resources and Geological Survey Department, p. 751-757. Albers, John P., 1953, Geology and |  | | Report (volume) | | West 920 Riverside Ave. WASHINGTON, D.C.--U.S. Department of the Interior Bldg., Rm. 2650, 1849 C St.,... U.S. GEOLOGICAL SURVEY BULLETIN 1693 U.S. DEPARTMENT OF THE INTERIOR MANUEL LUJAN, JR., Secretary...based on considerations that extend far beyond the mine itself, in some instances relating to the overall...subject, as in a scale model of the workings of a mine, to a unifying concept that explains or describes...useful sources for multiple deposit types (Canada Department of Energy, Mines and Resources, 1980; DeYoung |  | Doebrich, Jeff L., Albino, G.V., Barker, C.E., Duffield, W.A., Dunn, V.C., Hanna, W.F., McFarlan, J.P., McGuire, D.J., Miller, M.S., Peters, S.G., Plouff, Donald, Raines, G.L., Sawatasky, D.L., Spanski, G.T. (1994) Resource assessment of the Bureau of Land Management's Winnemucca District and Surprise Resource Area, Northwest Nevada and Northeast California. Open-File Report Vol. 1994 (94-712) US Geological Survey doi:10.3133/ofr94712 | Report (issue) | | UNITED STATES DEPARTMENT OF THE INTERIOR U.S. GEOLOGICAL SURVEY RESOURCE ASSESSMENT OF THE BUREAU OF...Rock National Conservation Area), and the impact of mine dewatering on drainage basin groundwater resources...public lands from mineral entry, and the impact of mine dewatering on drainage basin groundwater resources...past decade has created concern about the impact of mine dewatering on groundwater resources in this region...resources for the entire state, as part of a Department of Energy supported program. The NBMG is willing |  | | Book | | Associations and Deposits PARTB Peter Laznicka Department of Earth Sciences, University of Manitoba, Winnipeg...sills), if they are exposed in outcrop or in the mine workings at all. The Climax Mo complex is the best...known (e.g. the Montana Tunnels deposit, Obelisk Mine). The former locality contains disseminated pyrite...joints ~~jr-*~z?Z. Joint pattern ί Quarts veins ft Mine; fr-iron, Cwcefiper, m U.S. Homestead mmmww** Vehicle...accumulated in endocontact stockworks. The small Jessie mine in the Breckenridge field (about 2 t Au; Lovering |  | | Book | | their hard work and dedication. Brian J. Skinner Department of Geology and Geophysics Yale University New...Processes in Geologic History Charles Meyer Department of Geology and Geophysics, University of California...base of the Complex (Vermaak, 1976). At the Atok mine, platinoid minerals tend to occur at the boundaries...outward to the propyllitic assemblage—chlorite-epidote-carbonatepyrite. This outer envelope or zone may...Rye, D. M., and Rye, R. O., 1974, Homestake gold mine; I. Stable isotope studies: Econ. Geol., v. 69, |  | | Book | | Associations and Deposits PARTB Peter Laznicka Department of Earth Sciences, University Man. R3T2N2,...sills), if they are exposed in outcrop or in the mine workings at all. The Climax Mo complex is the best...known (e.g. the Montana Tunnels deposit, Obelisk Mine). The former locality contains disseminated pyrite...accumulated in endocontact stockworks. The small Jessie mine in the Breckenridge field (about 2 t Au; Lovering...cover sequences, and 1034 Fig. 28-14. Jessie gold mine, Breckenridge, Colorado. LITHOTHEQUE, after Ransome |  | | Book | | manuscripts, and tile secretcJn.il ,rnff nl the Department ol Earth Sciences at the Open Un iversity for...Oceanography, La .Jolla, CA 92093, USA. J. S. McCLAIN, Department of Geology, University of Caldornia, Dav 1~,...Ophioli1e S1'111pos111m, C,•pr11s, Geological Survey Department. ieos1a, Cyprus. 182-92 pp. CANN,J, R. 1974....acknowledge the assistance of Mr M. Kassim of the Department or Petroleum and Minerals, Muscat; and the government...2756-62. J. D. SMcWING, Earth Resources Institute, Department of Geology, University College of Swansea, Swansea |  | | Journal (issue) | | topics 124 . Principal Editor R. A. H O W I E Department of Geology Royal Holloway & Bedford New College...the flood basalt contain microcline. calcite. epidote a r t chlorite. T h e R b / S r dating o f the...between 1060 and 1047 m.y. The fission track age on epidote is I 0,m.y. K . A . 1 90M/0034 N e w isotopic...Zn, Cu, Mo. W and Ti. Au occurs at King Solomon's mine at Mand adh Dhahab. Also illustrated are olivine...cpidote relative to other calcic alteration phases. Epidote-rich rocks (epidosites) observed a t t h e base |
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