 | Richards, Jeremy P., McCulloch, Malcolm T., Chappell, Bruce W., Kerrich, Robert (1991) Sources of metals in the Porgera gold deposit, Papua New Guinea: Evidence from alteration, isotope, and noble metal geochemistry. Geochimica et Cosmochimica Acta, 55 (2) 565-580 doi:10.1016/0016-7037(91)90013-u | Journal (article/letter/editorial) | | metalsulphide veins, to late, very high-grade Au’- and Au-Ag-telluridebearing veins (locally in excess of 3000...and more subtle geochemical differences such as Au/Ag ratios, sulphur content, and base metai abundances...and stockworks (Fig. 2a). Pyrite, sphalerite, and galena are the most common sulphides in A-type veins and...veins are distinguished from type A by their lower Au/Ag and Au/S ratios, and the consequent abundance of...chalwpyrite, &ally abundant Au0 or electrum, and Au-Ag-telhuides, and ram coloradoite (HgTe) and altaite |  | | Report (issue) | | Natural Environment Research Council Polaris House, North Star Avenue, Swindon, Wiltshire SN2 lEU w Swindon...covers the Lake District, the western part of the North Pennines and the adjacent areas of low ground. The...produced in the past from the orefields of the North Pennines and the Lake District, and from the iron...somewhat older slates of the Skiddaw Group to the north. To the south lies lower ground consisting of slates...Eden, the Salway Plain and the western part of the North Pennines. Major subdivisions of the larger area |  | | Report (volume) | | and occurrence _ ____ __ Petrography __ . Quartz basalt Distribution and character- ___. _ Petrography...Quaternary igneous rocks____________________ o Basalt _________________________ ___ Distribution and...___ Lower Mimbres Valley______________________ North-central townships_____________________ Northeastern............ 12 III. A, North end of Florida Mountains; B, Capitol Dome near north end of Florida Mountains...12 V. A, The great spring at old Fort Cummings, north of Deming, N. Mex.; B, Goodsight Peak, 8 miles east |  | | Book | | OF THE PORPHYRY COPPER DEPOSITS Southwestern North America oe ‘ ” MohBy yy a i; ¢ ¢ ¢ GEOLOGY...OF THE PORPHYRY COPPER DEPOSITS Southwestern North America Edited by SINCE RoR EEL LEY. Department...Trends—Precambrian Northeast Structural Trends— North-South (Meridional) Structural Trends—Front Range...shall boundary in Arizona. This transition zone is north of Morenci, Miami-Inspiration, and Bagdad _por-...near a continental borderland; and intercalated basalt and rhyolitic rocks are present. Rhyolitic tuff |  | Gomes, Celso de Barros, Comin-Chiaramonti, Piero, Azzone, Rogério Guitarrari, Ruberti, Excelso, Rojas, Gaston Eduardo Enrich (2018) Cretaceous carbonatites of the southeastern Brazilian Platform: a review. Brazilian Journal of Geology, 48 (2) 317-345 doi:10.1590/2317-4889201820170123 | Journal (article/letter/editorial) | | 6 Juquiá (Serrote) Plug, dike Mg-ca, Ca-ca Py, AG, I-Mel, NS, S, Sd, AB, Te, Pho, Fe Do, Ank, Cc,... 4-6, 13 22 Morro do Engenho Vein Ca Py, Pe, AG, NS Cc, Phl n.d. 2, 4-6, 13, 90, 94 23 Santo... 112 27 Cerro Cañada Stock Ocelli in ijolite AG, NS, I Cpx, Ol, Bi, Cc Lower Cretaceous 103-106...Rock abbreviations: A, ankaratrite; AB, alkali basalt; AG, alkali gabbro; Ana, analcimite; Apt, apatitite;...feldspar; Fl, fluorite; Flca, fluorocarbonates; Ga, galena; Go, goethite; Gr, garnet; Hb, hornblende; Hm, |
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