 | | Journal (article/letter/editorial) | | LONG-LIVED HYDROTHERMAL SYSTEM IN THE FRESNILLO SILVER DISTRICT, MEXICO: CONSTRAINTS FROM 40Ar/39Ar GEOCHRONOLOGY...Environmental Sciences Department, New Mexico Institute of Mining and Technology, Socorro, New Mexico 87801 2New...and Mineral Resources, New Mexico Institute of Mining and Technology, 801 Leroy Place, Socorro, New Mexico...and dikes are the youngest igneous rocks in the district. Spatial association of Tertiary volcanic rocks...sulfate alteration, and epithermal veins makes the district ideal for evaluating the temporal relations between |  | | Journal (article/letter/editorial) | | BE LT N 1. Hombre Muerto 2. Cerro Plegado 3. El Peñón 4. Cazadero Grande M O B. Western Sierras...abbreviations from Kretz (1983). (a) Sample 01–24 from El Peñon, clinopyroxene (Cpx), garnet (Grt) and titanite...plagioclase (Pl) and quartz (Qtz). (b) Sample 01–80 from Sierra Umango, titanite grains of different size are randomly...annealed matrix of calcite. (c) Sample 01–89 from Sierra Umango, titanite behaves rigid in the deformed...grains appear to be rounded. (d) Sample 01–111 from Sierra de Maz, titanite marks the foliation in a rigid |  | Witt, W. K., Hagemann, S. G., Villanes, C., Vennemann, T., Zwingmann, H., Laukamp, C., Spangenberg, J. E. (2016) Multiple Gold Mineralizing Styles in the Northern Pataz District, Peru. Economic Geology, 111 (2) 355-394 doi:10.2113/econgeo.111.2.355 | Journal (article/letter/editorial) | | Gold Mineralizing Styles in the Northern Pataz District, Peru* W. K. Witt,1 S. G. Hagemann,1 C. Villanes...Abstract Gold production from the northern Pataz district in the eastern Andean Cordillera of Peru has been...batholith, in the Vijus-Santa Filomena area of the district. Both are located within a central horst; similar...hydrothermal alteration in the northern Pataz district. Introduction The Pataz-Parcoy goldfields are...main sites of hydrothermal activity in the Pataz district: (1) batholith-hosted veins and related alteration |  | | Journal (article/letter/editorial) | | proportions. Minor and trace constituents include epidote-clinozoisite, tourmaline, rutile, zircon, oxides-hydroxides...tunnel construction in mountain regions and deep mining operations (e.g., Brown and Trollope 1967), and...High explosive VZ-#10.929 EP7: K/T boundary, El Peñon, northeast Mexico 34 4 9.5 Composition B |  | | Book (edition) | | especies. Cabe señalar la actuación de Roberto Beder por el aporte del estudio de los minerales en las calizas...Brodtkorb, M.K. de, Gordillo, C. y Gay, H.D., 1983, el número de minerales ascendía a 466 debido principalmente...incorporación del estudio de minerales radiactivos. El anexo de la tercera versión, publicado por Milka...Pezzutti, S. Tourn, y M.E. Vattuone constó de 3 tomos. El primero incluyó las clases I (elementos) y II (sulfuros...sulfosales, seleniuros y telururos), publicado en 2002. El Tomo 2, involucró las clase III (halogenuros), clase |
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