 | | Journal (article/letter/editorial) | | the Cayconi volcanic field, Cordillera de Carabaya, SE Peru Hamish A. Sandeman *, Alan H. Clark Department...The Cayconi district of the Cordillera de Carabaya, SE Peru, exposes a remnant of an upper Oligocene –...in the Oligo-Miocene rocks of the Cordillera de Carabaya, suggesting that the S-type rocks in this area...2004 Elsevier B.V. All rights reserved. Keywords: Peru; Inner arc; S-type magmas; Potassic mafic magmas;...et al., 1984; 1990a), a long-lived petrogenetic province distinct in numerous respects from the contemporaneously |  | | Journal (article/letter/editorial) | | Cordierite±Biotite Rhyodacite, Valle Ninahuisa, Puno, SE Peru: Petrological Evidence for Hybridization of...in the Central Andean Inner Arc of southeastern Peru, is interpreted as a pristine analogue of a Lachlan-type...hsandema@nrcan.gc.ca that of the subsequent, 7^17 Ma, Macusani Formation ash-flows, and other strongly peraluminous...granites and rhyolites, including the well-known Macusani rhyolites. Moreover, a nearby, closely allied...latitude, 70 350 300 W longitude in Puno Department of southeastern Peru. The valley is eroded into the SE |  | | Journal (article/letter/editorial) | | Springer-Verlag1988 The Miocene-Pliocene Macusani Volcanics, SE Peru I. Mineralogy and magmatic evolution...Canada, 1470, Lima 13, Peru Abstract. The Miocene-Pliocene Macusani volcanics, SE Peru, outcrop in three...activity from 10 to 4 Ma in the Macusani field. The volcanics in the Macusani basin comprise crystal-rich...is essentially constant throughout the entire Macusani field. Two distinct generations of plagioclase...Miocene-Pliocene peraluminous volcanics from the Macusani area, SE Peru. Compared to previously described peraluminous |  | | Journal (article/letter/editorial) | | 1. GEOLO(~tCAL SECTIOh'S through tl, e A~DES of PERU and Bo1,1vIA : I I - - F r o m tl~e P o w r o f............. (2) The Country between Arequipa and Puno .................. (3) The Country between Tirapata...Expedition ix) Peru. I t deals with a second and pal~llel section drawn through the south of Peru from the...and the port of Puno on Lake Titicaca, is accessible by the Southern Railway of Peru, of which we were...taken. For the continuation of the section beyond Puno through the Eastern Cordillera, it was found necessal |  | De Wispelaere, Sidoine, Cabaret, Delphine, Levelut, Claire, Rossano, Stéphanie, Flank, Anne-Marie, Parent, Philippe, Farges, François (2004) Na-, Al-, and Si K-edge XANES study of sodium silicate and sodium aluminosilicate glasses: influence of the glass surface. Chemical Geology, 213 (1) 63-70 doi:10.1016/j.chemgeo.2004.08.033 | Journal (article/letter/editorial) | | (namely water and CO2). A study of a 30-year-old albite glass and a natural rhyolitic glass confirms these...natural glass (rhyolite, highly polymerized) from Macusani, Peru. The albitic glass was prepared by Yannick...contact with air, and (2) a natural rhyolite from Macusani (Peru), donated by Michel Pichavant (ISTO, Orléans...pebble of a natural rhyolite from Macusani (bmacusaniteQ, Puno region, Peru: Farges and Rossano, 2000), which...30-year-old slice) and a rhyolite glass from Macusani, Peru (30 millions years old). hydrated media for |  | Harlaux, Matthieu, Kouzmanov, Kalin, Gialli, Stefano, Laurent, Oscar, Rielli, Andrea, Dini, Andrea, Chauvet, Alain, Menzies, Andrew, Kalinaj, Miroslav, Fontboté, Lluís (2020) Tourmaline as a Tracer of Late-Magmatic to Hydrothermal Fluid Evolution: The World-Class San Rafael Tin (-Copper) Deposit, Peru. Economic Geology, 115 (8). 1665-1697 doi:10.5382/econgeo.4762 | Journal (article/letter/editorial) | | The World-Class San Rafael Tin (-Copper) Deposit, Peru Matthieu Harlaux,1,†,* Kalin Kouzmanov,1 Stefano...A., Jr. Lorenzo Bernini 149, San Borja, Lima 27, Peru Abstract The world-class San Rafael tin (-copper)...(-copper) deposit (central Andean tin belt, southeast Peru) is an exceptionally large and rich (>1 million...Miocene Sn-W ± Cu-Zn-Pb-Ag deposits in southeast Peru. Rare earth †Corresponding author: mharlaux@unr...(-Cu) deposit (central Andean tin belt, southeast Peru) that represents an exceptionally large and rich |  | Wandji, Pierre, Tchokona Seuwui, Dieudonné, Bardintzeff, Jacques-Marie, Bellon, Hervé, Platevoet, Bernard (2008) Rhyolites of the Mbépit Massif in the Cameroon Volcanic Line: an early extrusive volcanic episode of Eocene age. Mineralogy and Petrology, 94 (3) 271-286 doi:10.1007/s00710-008-0013-6 | Journal (article/letter/editorial) | | Line (CVL) is a continental intraplate volcanic province (Fig. 1a) in Central Africa. This huge tectonic...Fe2O3 for Fe, MnTiO3 for Ti and Mn, Cr2O3 for Cr, albite for Na, orthoclase for K and Al, counting times...Total CIPW Norm Quartz Corundum Aegirine Orthoclase Albite Anorthite *Diopside Ca *Diopside Mg *Diopside Fe...Escalant 1988), Cerro Cancahuine, Peru (Sandeman and Clark 2004), Macusani, Peru (Pichavant et al. 1988) 279...Afar Rift Corsica Iceland 0.1 Martinique Peru Macusani 0.01 Cs Rb Ba Th U crust in the genesis of |  | | Journal (article/letter/editorial) | | associated autunite mineralisation from Macusani Meseta, Peru. Mean δ238U values of uranium minerals relative...Canada, and peraluminous rhyolites from Macusani Meseta, Peru, to better understand (1) the primary mechanisms...and phosphates. Peraluminous rhyolites from Macusani, Peru were measured because they are the source of...represented by autunite veins hosted in Macusani Meseta rhyolites from Peru. Six stages of uranium mineralisation...for magmatic related, except for calcrete and Macusani mineralisation at < 50oC. Unconformity and related |  | | Journal (article/letter/editorial) | | June 11, 1989; accepted August 7, 1990 Summary Albite-topaz kerotophyres, termed ongonites, were discovered...rocks elsewhere (Beauvoir and Cinovec granites; Macusani glass). Ongonites are fluorine-rich peraluminous...granitoids with orthoclase and albite phenocrysts, high modal and normative albite content and the presence...Granite von Beauvoir und Cinovec, das Glas von Macusani) verglichen. Ongonite sind Fluor- und Aluminiumreiche...Introduction The discovery by Kovalenko et al. (1970) of albite topaz keratophyres (ongonites) closely associated |  | | Journal (article/letter/editorial) | | a natural F-, B-, and Prich composition (Macusani glass, Peru). Starting material and procedures Starting...composition of the natural sample (MAC-JV1, Macusani glass, Peru) used in this study is given in Table 2...the experiments. Table 2. Composition of the Macusani starting glass - Experimental procedure Experimental...given composition and P-T conditions (e.g. for albite melts, see the review of Dingwell 1987). Thus,...are given in Table 4 10 [] P-bearing melt ] [] Macusani melt ~ ? - . " 9 c,~/4"- I " .,4 ,~. 8oooc |  | | Journal (article/letter/editorial) | | occurrences are the Cenozoic ignimbritic tuffs of Macusani in Peru (Arribas and Figueroa 1985). Peralkaline granites...exemplified by the mid-European Variscan uranium province, which extends over more than 2,000 km from Spain...metalogenia de las mineralizaciones uraniferas de Macusani, Puno (Peru). Proc. IAEA Vienna, Symp. Uranium deposits... (in Russian) Kish L, Cuney M (1981) Uraninite–albite veins from the Mistamisk Valley of the Labrador...late-tectonic granitic pegmatites, south west Grenville Province, Canada. Ore Geol Rev 11:197–227 Leroy J, George-Aniel |  | | Journal (article/letter/editorial) | | rhyolites. Phenocrystsconsist of quartz, sanidine, and albite (10-500/ototal) in a glassyor fine-grained groundmass...erupted at 4.7 Ma in the eastern Basin and Range province (Lindsey, niently divided into two units, a pyroclastic...sodic (Ab*r-nr)than z plagioclasereported for Macusani glass (Abr.*o) (PichaFig. 2. Stratigraphic columnof... although it remains less than l. Reducing the albite TABLE 3. Representative analysesof feldspar 42...typical topaz rhyolites ofthe easternBasin and Range province, Ztcon occurs as 5-50 pm diameter microphenocrysts |  | | Journal (article/letter/editorial) | | magmatic fractionation. Rock-forming minerals (quartz, albite, spodumene and mica) display δ7Li signatures that...mineralogy of the dikes includes: quartz, K-feldspar, albite, spodumene, various micas (lepidolite, muscovite...rock-forming minerals, quartz, spodumene, feldspar, albite and mica, as follows: SQF (spodumene–quartz–feldspar)...(spodumene–quartz–feldspar–lepidolite), QA (quartz–albite), QFL (quartz–feldspar–lepidolite), and QM (quartz...6.0 2.6 2.7 8.3 12.0 4.6 7.8 12.8 9.2 4.6 A = albite. F = feldspar. L = lepidolite. M = mica. Q = quartz |  | | Journal (article/letter/editorial) | | granite-pegmatite systems: experimental results with Macusani glass at 200 MPa David London, Richard L. Hervig...lithophile-element-rich rhyolite obsidian from Macusani, Peru, reveal high miscibility of H20 and silicate...mica, quartz, albite, and orthoclase. The volumetric proportion of (mica + orthoclase)/albite increases slightly...melt to near unity with the vapor-deposition of albite. The abundances of most trace elements in residual...study using rhyolite obsidian (macusanite) from Macusani, Peru (Barnes et al. 1970; Noble et al. 1984; Pichavant |  | | Journal (article/letter/editorial) | | Li-rich granitic pegmatites:Part II. Spodumene* albite * quartz equilibrium M,rnrrNn Llcncrrr' ANsorr...kbar to study the equilibrium between spodumene,albite, quartz, and the coexisting hydrothermal chloride...spodumeneas well as in albite is very much restricted. When spodumenecoexistswith albite and quartz, the alkali...Na/(Na + Li) in the fluid buffered by coexisting albite and spodumene, with or without melt, is constant...and B qtnrtz, has been found in the Macusani volcanic glass, Peru (French et al., 1978; London, 1987; |  | | Report (chapter) | | structure of a mythic narration. The Tuscan Magmatic Province and the Island of Elba granitic rocks Regional... Geological sketch map of the Tuscan Magmatic Province and location of the main ore deposits exploited...felsic magmas to generate the Tuscan Magmatic Province intrusive and extrusive products exposed over...(Serri et al. 1993). Thus the Tuscan Magmatic Province with its peraluminous boron-rich granites and...deposits of Elba are part of the metallogenic province of Tuscany. Exploitation since Etruscan time (Corretti |  | | Journal (article/letter/editorial) | | of a two-mica ignimbrite suite: the Macusani Volcanics, SE Peru Michel Pichavant and Jean-Marc Montel...ABSTRACT: The Miocene-Pliocene Macusani ash-flow tuffs and glasses from SE Peru are a rare example of two-mica...Cordillera Oriental in the Central Andes. In the Macusani field, the rocks are characterised by andalusite...differences between the magmatic evolution of the Macusani Volcanics and of Hercynian and Himalayan two-mica...paper focusses on the Miocene-Pliocene Macusani Volcanics from SE Peru, which, so far, constitute the only |  | | Journal (article/letter/editorial) | | compositions (muscovite-quartzalbite and muscovite-quartz-albite-biotite + aluminum silicate + cordierite) performed...metastableextension of the reaction muscovite + quartz + albite + HrO : melt * aluminum silicate. Biotite is stable...crystalline tial melting of the assemblagequartz + albite + musphasesare known. Becauseother elements important...TheHrO-saturated haplogranite solidus(quartz + albite* orthoclase+ HrO : melt)and thesubsolidus second...wasdelineatedby Yoderand Eugster(1955).Abbreviations:Ab : albite, Als : aluminumsilicate,Ms : muscovite,Qtz: quaftz |  | Borisova, A. Y., Pokrovski, G. S., Pichavant, M., Freydier, R., Candaudap, F. (2010) Amorphous Materials: Properties, Structure, and Durability: Arsenic enrichment in hydrous peraluminous melts: Insights from femtosecond laser ablation-inductively coupled plasma-quadrupole mass spectrometry, and in situ X-ray absorption fine structure spectroscopy. American Mineralogist, 95 (7) 1095-1104 doi:10.2138/am.2010.3424 | Journal (article/letter/editorial) | | spectroscopy, in a rhyolitic peraluminous glass from Macusani (SE Peru) that is representative of anatectic melts...and in volcanic rhyolites from the Macusani volcanic field in Peru [100–300 ppm, Pichavant et al. (1987)]...an As-enriched natural silicate glass from the Macusani volcanic field (macusanite), representative of...enriched peraluminous obsidian glass from the Macusani area, SE Peru, named macusanite (Pichavant et al. 1987...description The Pliocene obsidian glasses from Macusani, SE Peru, are associated with felsic peraluminous ash-flow |  | | Journal (article/letter/editorial) | | microperthitic hypersolvus albite-rich microphenocrysts (T > 650 Ê C) and late fine-grained albite-poor crystals....peraluminous two-mica rhyolites and granites of Alaska, Peru, South-West England, Portugal, Czech Republic, Mongolia...plagioclase cut and replaced by late turbid pure albite [1.6 mm]; e) microphenocrist of Carlsbad twinned...resorbed quartz surrounded by sericitised turbid late albite [1.6 mm]; i) polished surface of a hand specimen...exclusively by fine-grained turbid albite and K – feldspar. Fig. 3 d shows late albite cutting and replacing an |  | Zhu, Jin-Chu, Li, Ren-Ke, Li, Fu-Chun, Xiong, Xiao-Lin, Zhou, Feng-Ying, Huang, Xiao-Long (2001) Topaz–albite granites and rare-metal mineralization in the Limu District, Guangxi Province, southeast China. Mineralium Deposita, 36 (5) 393-405 doi:10.1007/s001260100160 | Journal (article/letter/editorial) | | Huang Topaz±albite granites and rare-metal mineralization in the Limu District, Guangxi Province, southeast...2001 Ó Springer-Verlag 2001 Abstract The topaz±albite granites of the Limu district are ultra-acidic...leucocratic microcline-albite granite, through albite-microcline granite, topaz±albite granite, pegmatite...mineralization, and melt inclusions in quartz, topaz, and albite are typical features indicative of their crystallization...petrographic textures and mineral associations. The topaz± albite granites and associated mineralization in the Limu |  | | Journal (article/letter/editorial) | | Springer-Verlag 1989 Vapor-undersaturated experiments with Macusani glass + H20 at 200 MPa, and the internal differentiation...Vapor-undersaturated fractional crystallization experiments with Macusani glass (macusanite), a peraluminous rhyolite obsidian...(LiA1Si5012) + mica; and (4) late-stage, fine-grained albite+mica intergrowths that are deposited from alkaline...crystallization at 200 M P a for the Macusani rhyolite obsidian (macusanite) from SE Peru (Barnes et al. 1970; Pichavant...Time-temperaturepaths Experimental methodology Macusani glass (macusanite) was ground under ethanol to |  | | Journal (article/letter/editorial) | | from southern Peru to northern Argentina and is the easternmost metallogenic province of the central...porphyry systems. 313 314 DIETRICH ET AL. 76° PERU 72° Neogene-Recent volcanic arc Triassic and Tertiary...Proterozoic basement rocks 16° 68° San Rafael Macusani 16° Cerro Verde Chojlla Cuajone La Paz Toquepala...and Harris, 1989), and the strongly peraluminous Macusani tuffs, with inferred metapelitic source, have...in 319 320 DIETRICH ET AL. agreement with albite-oligoclase fractionation (Llallagua, Cerro Rico) |  | Hofstra, A. H., Todorov, T. I., Mercer, C. N., Adams, D. T., Marsh, E. E. (2013) Silicate Melt Inclusion Evidence for Extreme Pre-eruptive Enrichment and Post-eruptive Depletion of Lithium in Silicic Volcanic Rocks of the Western United States: Implications for the Origin of Lithium-Rich Brines. Economic Geology, 108 (7) 1691-1701 doi:10.2113/econgeo.108.7.1691 | Journal (article/letter/editorial) | | extensional tectonics that produced the Basin and Range province and Rio Grande rift, an evolving pattern of closed...pegmatite (Congdon and Nash, 1991). Obsidian from Macusani, Peru, has the highest lithium abundance yet reported—of...SILICIC VOLCANIC ROCKS, WESTERN USA 10,000 Macusani, Peru 3400 ppm Lithium ppm 1,000 90th 100 50th...extensional tectonics that produced the Basin and Range province and the Rio Grande rift. This setting also produced...Rio Grande Rift Rio Grande Rift Basin and Range province Rift State New Mexico Colorado Utah Utah New Mexico |  | | Journal (article/letter/editorial) | | crystallization experiments with obsidian from Macusani, Peru; the composition of that obsidian is virtually...2006). Melt containing 4 wt% H2O derived from the Macusani obsidian (saturated at ~10 wt% H2O) at 200 MPa...plagioclase (+ quartz ± zinnwaldite) evolves to albite (An2) – K-feldspar pairs (Fig. 2); compositions...K-feldspar Figure 2. A representative experiment with Macusani glass + 3–4 wt% added H2O, preconditioned at 750...inward to patchy crystals of K-feldspar and albite. Isolated albite crystals occur with Li-mica and abundant |
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