 | Lajoinie, M.F., Lanfranchini, M.E., Recio, C., Sial, A.N., Cingolani, C.A., Ballivián Justiniano, C.A., Etcheverry, R.O. (2019) The Lomagundi-Jatuli carbon isotopic event recorded in the marble of the Tandilia System basement, Río de la Plata Craton, Argentina. Precambrian Research, 326. 447-461 doi:10.1016/j.precamres.2018.03.012 | Journal (article/letter/editorial) | | Miguel area. The calcite-diopside marble, hosted by biotite gneiss and intruded by 2.12 Ga garnet-leucogranite...Lomagundi-Jatuli isotopic event. other outcrops from the South African cratons (Schidlowski et al., 1976; Gauthier-Lafaye...2010) is located in South America, and it is mainly exposed in Uruguay, Paraguay, south-eastern Brazil, and...the boundary of the RPC could be extended further south (to the limit with the Patagonia terrane; Ramos...km stretch south of Azul city (Frisicale et al., 1999), and a 25-km-long belt located south of Tandil |  | Maffini, M. Natalia, Wemmer, Klaus, Radice, Stefania, Oriolo, Sebastián, D'Eramo, Fernando, Coniglio, Jorge, Demartis, Manuel, Pinotti, Lucio (2017) Polymetallic (Pb-Zn-Cu-Ag ± Au) vein-type deposits in brittle-ductile transtensional shear zones, Eastern Sierras Pampeanas (Argentina): Age constraints and significance for the Late Paleozoic tectonic evolution and metallogenesis. Ore Geology Reviews, 89. 668-682 doi:10.1016/j.oregeorev.2017.07.003 | Journal (article/letter/editorial) | | representative mineralized areas comprise, from north to south, three main districts: Oro, Las Guindas and Piedra...selected study areas, Las Guindas and Oro districts, local mapping and structural analysis of individual deposits...Orientation and along-strike continuity The Las Guindas district is made up of two major mineralized NNW-trending...to 100 m and frequent bifurcations from north to south, link to form a larger through-going structure which...The most important past-producing mine of the district for Pb-Ag-(Au), the Natacha mine, is located at |  | | Journal (article/letter/editorial) | | Central Andes: The Arequipa and Related Terranes Victor A. Ramos Laboratorio de Tectónica Andina, Universidad...massif is explained by a backarc, which further south changed to open oceanic conditions and subsequent...Figure 1), was considered an integral part of the South American continent (Cobbing et al. 1977) since the...dilemmas on the crustal growth proposed for the South America basement by Cordani et al. (1973). Cordani...where the Arequipa basement was an integral part of South America, and the mobilistic approach, which interpreted |  | | Corporate Document (Series) | | Geology and major deposits, Heazlewood mineral district ... Main mineral locations and 1:100 000 scale...sills, equivalent to those in Antarctica and South Africa. This dolerite is also mostly unmineralised...widespread uplift and erosion, but there were some local high-level, lamprophyric and alkaline igneous intrusions...mine at Beaconsfield and mines in the Mathinna district being the major producers. The former Tasmania...Heazlewood area (fig.4 Prospectors worked their way south through difficult terrain and rainforest, and found |  | | Report (chapter) | | crustal extensional detachment system V. Pease and J. Argent Geological Society, London, Special Publications...University on September 7, 2012 180 V. PEASE & J. ARGENT through a crustal-scale detachment fault system...fault surface of the SMDF at c. 14.3 Ma (K-Ar biotite and sanidine; Simpson et al. 1991) define the cessation...correlative Fenner Gneiss, a coarse-grained, porphyritic biotite granite (Hazzard & Dosch 1937; Bender et al. 1990)...of the exposure north of Interstate 40 (Fig. 2). South of Interstate 40, Late Cretaceous granodioritic |  | | Journal (article/letter/editorial) | | it is also one of the largest gold producers in South America. The deposit is characterized by an alteration-zoning...with phenocrysts of alkali feldspar, plagioclase, biotite, and very rare amphibole in a fine-grained feldspathic...groundmass. The abundance of hydrous minerals, such as biotite phenocrysts and apatite microphenocrysts, is consistent...rocks underwent moderate degrees of clinopyroxene-biotite-apatite-titanite fractionation. Several samples...shoshonitic compositions are also known in the South American Andes, being mainly confined to the Central |  | Feraud, G., Alric, V., Fornari, M., Bertrand, H., Haller, M. (1999) 40Ar/39Ar dating of the Jurassic volcanic province of Patagonia: migrating magmatism related to Gondwana break-up and subduction. Earth and Planetary Science Letters, 172 (1) 83-96 doi:10.1016/s0012-821x(99)00190-9 | Journal (article/letter/editorial) | | large igneous province (LIP) of Patagonia (southern South America), which is one of the largest silicic provinces...Mesozoic volcanic province of Patagonia, in southern South America (Fig. 1), represents one of the largest...Gondwana (after [7], modified). SA D South America, A D Africa, AP D Antarctica Peninsula, ANT D Antarctica...(B) paleogeographic reconstructions of southern South America illustrating troughs and sags, after Uliana...and (2) preceding the formation of the earliest South Atlantic seafloor (in the east) and a marginal basin |  | | Journal (article/letter/editorial) | | Pershinskoe skarn magnetite deposit (the Olginsky district), Novogorbushinskoe skarn deposit (the Dalnegorsk...magnetite zone located in the south-western part of the Komsomolsk ore district in highly amphibolized Jurassic...associated with manganoan ilmenite, pyroxene, biotite (Table II, P-50 a-c), chlorite and hydromuscovite...Novogorbushlnskoe s k ~ deposit; M-9, the Ko~somolsk ore district, f = Fe/(Fe+Mg) at.%. pyroxene skarn C1-K amphibole...- garnet; P-5Oa~ 5577a - pyroxene; P - 9 0 b - biotite; P-50O -llmenite. SHORT C O M M U N I C A T I |  | Ford, A., Hagemann, S.G., Fogliata, A.S., Miller, J.M., Mol, A., Doyle, P.J. (2015) Porphyry, epithermal, and orogenic gold prospectivity of Argentina. Ore Geology Reviews, 71. 655-672 doi:10.1016/j.oregeorev.2015.05.013 | Journal (article/letter/editorial) | | deposits such as those in the El Indio–Pascua gold district which hosts the Veladero and Pascua-Lama high...side of the border), and the Deseado Massif gold district which hosts, amongst others, the Cerro Vanguardia...Massif. Below a brief description of the regional district geology and deposit setting is provided. For a...Hagemann (2011a). 2.1. North-western Argentina gold district in Juyuy, Salta and Catamarca provinces (Orogenic)...in the hydrothermal evolution), sulfidation, and local silicification of pelite and psammite wallrocks. |  | | Journal (article/letter/editorial) | | minerals are irregularly distributed through a local valley fill and are mostly epigenetic but partially...5 kilometers east of the junction with a north-south valley known as Cueva Blanca. The locality lies...Supisaino) west of Loma Blanca and aligned in a north-south direction, forms the most striking morphologicalfeature...kilometers to the south and by Turner (1964\ to the zone of the Nevado de Cachi still further south. However,...Recent fluvial and pyroclastic sediments form a local valley fill. Related to the large volcanic system |  | | Journal (article/letter/editorial) | | other volcanic and sedimentary rocks present in the local underlying stratigraphy. 4.2.2. Interpretation Sharp...fragments and 5% opaque minerals; hornblende, biotite and potassium feldspar together represent ~ 4%...foreland, related to the flat subduction in the south Central Andes (see Kay and Mpodozis, 2002). Compiling...exceptional sources were responsible for increasing the local sedimentation rate. Considering the complete stratigraphy...with the volcaniclastic apron would have led to local flexural isostatic subsidence (Bahlburg and Furlong |  | | Book | | est) de feldspath, ME ‘4 et de mica (ici de la biotite, noire). : Formations magmatiques Gisements...Dédiée au physicien cristallographe autrichien Victor von Lang (1838-1921). © Cu°*4 (S0,)(0H)6°2 H20... Miargyrite, Argent rouge antimonié + Du grec mikros, peu considérable, et argyros, argent, soit «moins...«moins d'argent» (car la plus faible teneur en argent des «argents rouges»). - AgSbS> Cristaux tabulaires...et rutile, plus durs. À éclat mat Proustite, Argent rouge clair + Dédiée au chimiste français Joseph |  | | Report (volume) | | SALT LAKE CITY, Utah-Federal Bldg., Rm. 8105, 125 South State St. SPOKANE, Washington-U.S. Post Office Bldg...penetrated by a borehole in the Argenta mining district about 20 km northwest of Dillon, Mont. This unusually...of the hole at 336 m, are mostly coarse-grained biotite-quartz-plagioclase-potassium feldspar-garnet schist...between Archean and Cambrian rocks to the east and south of Argenta. These relations suggest that an onlap...Inferences that the Belt Basin extended far to the south of their present remnant were based solely on tenuous |  | | Report (chapter) | | complexes by hatchure. Extension migrated from south to north, beginning at c. 26 Ma in the Buckskin-Harcuvar...1991). Extension in the corridor progressed from south to north, based on K - A r ages of the oldest volcanic...1982, 1984; Spencer & Turner 1983; Spencer 1985; Argent 1996; Pease 1997). The extrusion of the c. 14.3...onto the exhumed fault surface of the SMDF (K-Ar biotite and sanidine; Simpson et al. 1991), and the untilted...north and a syntectonic intrusive complex to the south (Fig. 2). The gneisses are thought to be similar |  | | Book | | consistent with the Late Permian reference pole for South America. (2) Component B: determined at four sites...implications. Ph.D. thesis, University of Johannesburg, South Africa. UJ web free access Abre P, Zimmermann U, Cingolani...(Argentina). Rb–Sr isotopic age of basement rocks. In: II South American Symposium on Isotope Geology, SEGEMAR anales...(Ordovícico) del Bloque de San Rafael, Mendoza. Rev Asoc Argent Sedimentol 6(1–2):75–90 Mange MA, Maurer HFW (1992)...la Cordillera Frontal de Mendoza. Rev Asoc Geol Argent 64(2):295–302 Varela R, Dalla Salda L (1992) Geocronología |  | | Journal (article/letter/editorial) | | plus les particules d'or, et les appauvrissent en argent. Une dispersion m6canique lat6rale, vers l'aval...l o g i e Le gite d'or d'Ovala fait partie du district aurif6re d'Et6k6 (Et6k6, Dondo-Mobi, Mavikou,...pr6s de 15 tonnes-m6tal pur poor l'ensemble du district. Toute la r6gion est couverte par la for~t dense;...socle (> est form6 d'orthogneiss fi biotite, granitiques fi tonalitiques, structur6s en deux...<>, correspond au contexte g6ologique local du gite +tudi6. Les termes m6ta-volcaniques de ces |  | | Journal (article/letter/editorial) | | These fluids collect certain elements producing a district mineralogical specialization with inhomogeneities...(Derby, 2012). Examples of this type of deposit are District Artillery Park, Arizona, USA (Derby, 2012); Santa...F-Ba and "five-element" veins in the Freiberg district but ruled out a link between them. Examples of...data suggest that the S was leached from the local country rock by circulating waters, whereas the...low-sulfidation gold mineralization can be considered a local variant of the Cu-Au deposits in detachment zones |  | | Book | | Sciences in Brussels and the Royal Museum for Central Africa in Tervuren played an important role in descriptive...originating from foreign countries, especially in central Africa. Also the contributions of mining organizations...the old times minerals were known by traditional local names, given by miners (e.g. quartz, "mispickel';...(German), oro (Spanish), or silver, zilver (Dutch), argent (French), Silber (German), plata (Spanish), or...as a separate mineral, but only as a variety of biotite. In this discussion, the chronology of the first |  | Páez, G.N., Ruiz, R., Guido, D.M., Ríos, F.J., Subias, I., Recio, C., Schalamuk, I.B. (2016) High-grade ore shoots at the Martha epithermal vein system, Deseado Massif, Argentina: The interplay of tectonic, hydrothermal and supergene processes in ore genesis. Ore Geology Reviews, 72. 546-561 doi:10.1016/j.oregeorev.2015.07.026 | Journal (article/letter/editorial) | | mine sites mentioned in the text. b) Photo looking south at the Martha mine operations area showing the location...relatively young gold and silver producing region. 3. Local geology The mineralization at Martha mine is hosted...trend constitutes a subparallel array of steeply south dipping E–W trending structures (Fig. 2), ranging...high proportion of quartz, sanidine, plagioclase, biotite and amphibole crystal fragments surrounded by an...adularia crystal as an overprint. c) Illite zone: biotite crystal fragments and fiamme structures replaced |  | | Book (edition) | | Southern Africa a Collector’s Guide ■ Rocks, Minerals and Gemstones of Southern Africa & — - ... T ~ '' .rats en&nes L of Southern Africa A Collector’s Guide - Struik Publishers (an operating...suggestions and advice. Author’s Preface Southern Africa has much to offer the amateur geologist, whatever...best plan is to take local advice wherever you are. 9 In small places try the local police station first...usually helpful and will know it there are any local gem clubs and how to get in touch with them. There |  | | Journal (article/letter/editorial) | | - Ceinture des leucogranites (+(ii) granites ~ biotite et granodiorites) associ@s pro parte ~ la zone...sud-armoricaine; 12 - Ceinture des granites ~ biotite et granodiorites (+ leueogranites ultirnes), assoei@s...1973). • Plus au I~ord, une ceinture de granites biotite, accompagn~s de granodiorites et d' injections...hercyniennes sugg~re une origine crustale. Les granites ~ biotite et les granodiorites affleurent plus au Nord; leur...paragen~ses hercyniennes armoricaines. (b) Dans le district de Questembert (Lulzac, 1970b), des filons pegmatitiques |  | Büttner, S.H., Glodny, J., Lucassen, F., Wemmer, K., Erdmann, S., Handler, R., Franz, G. (2005) Ordovician metamorphism and plutonism in the Sierra de Quilmes metamorphic complex: Implications for the tectonic setting of the northern Sierras Pampeanas (NW Argentina) Lithos, 83 (1) 143-181 doi:10.1016/j.lithos.2005.01.006 | Journal (article/letter/editorial) | | Department of Geology, Rhodes University Grahamstown, South Africa Institut für Angewandte Geowissenschaften,...of four zones including the (1) chlorite, (2) biotite–muscovite, (3) garnet–cordierite–sillimanite, and...Geology, Rhodes University, Grahamstown 6140, South Africa. E-mail address: s.buettner@ru.ac.za (S.H. Bqttner)...tectonic and geodynamic background information for local and petrogenetic studies undertaken in the Sierras...shortening during the Andean Orogeny caused the north–south trending outcrop of all units. The box shows the |  | | Journal (article/letter/editorial) | | structures. They are composed of plagioclase, biotite and minor K-feldspar and amphibole crystaloclasts...Si-Fe-Al-Mg-K (only weak local depletion in Al in the western zone), loss in Na, and local loss in Mn-Ca in southwestern...copper deposit (San Pedro) located some 100 km south of the Infiernillo deposit, where a phyllic halo...recursos naturales de Mendoza: Relat. 12º Congr. Geol. Argent., pp. 161-172. Billa, M., Cassard, D., Lips, A...(Argentina): Redefiniciones estratigráficas. Congr. Geol. Argent. Abstracts, Buenos Aires, 1, pp. 541-550. Carpio |  | | Journal (article/letter/editorial) | | the north to the Eastern Pampean Ranges in the south (Figure 1). Southward, the PPP possibly extends...and the Conlara Metamorphic Complex (CMC) in the south, forming a package that different studies consider...mineral occurrences. In the south, the pegmatites of the Valle Fértil district are dominantly of muscovite...districts with Li-bearing pegmatites are, from north to south, El Quemado, Ancasti, Conlara, La Minerals 2022...Córdoba. 3.1. El Quemado Pegmatite District (QPD) The geology of the district consists of a thick turbiditic |  | | Book (edition) | | ), W. Sartorius von Waltershausen. Von Zeph ., Victor von Zepharovitch . Pell ., Bertrand Pelletier...; amalgam natif, de Lisle ; argental mercury ; argent amalgame, Dufr .; dodecohedral mercury, Mohs;.... Annivite . See Tetrahedrite . Anomite . See Biotite. Anorthic melane ore . See Allanite. Anorthisches...Mohs; soda-hornblende. Argent. See Silver. Argent amalgame. See Amalgam . Argent antimonial. See Dyscrasite...Dyscrasite . Argent antimonial ferro -arsenifère . See Dyscrasite. Argent antimonié sulfuré. See Pyrargy |
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Argent, Delmas, Victor Khanye Local Municipality, Nkangala District Municipality, Mpumalanga, South Africa