 | | Journal (article/letter/editorial) | | Oligocene-Miocene Crucero Supergroup of the southern Peru Inner Arc domain provide a previously unavailable...zone separating the sites of anatexis in southern Peru and northern Bolivia. This is inferred to represent...subdivisions of the Andean orogenic belt in southern Peru and contiguous northern Bolivia. The approximate...westerly of these constitutes the 6000- to 8000-m-deep Peru-Chile trench and the forearc slope (Llanuras Costaneras)...western Bolivia, but narrows markedly in southeastern Peru, where an extensive 4000- to 5000-m-high mountainous |  | Clark, Alan H., Farrar, Edward, Kontak, Daniel J., Langridge, Robert J., Arenas F., Mario J., France, Lynne J., McBride, Sandra L., Woodman, Priscilla L., Wasteneys, Hardolph A., Sandeman, Hamish A., Archibald, Douglas A. (1990) Geologic and geochronologic constraints on the metallogenic evolution of the Andes of southeastern Peru. Economic Geology, 85 (7) 1520-1583 doi:10.2113/gsecongeo.85.7.1520 | Journal (article/letter/editorial) | | MetallogenicEvolution of the Andes of Southeastern Peru ALANH. CLARK,EDWARDFARlIAR,DANIELJ. KONTAK,*ROBERT... GedlogoConsultor,Caminosdel Inca 698, Lima 33, Peru LYNNEJ. FRANCE,**SANDRA L. MCBRIDE,PRISCILLA L...post-Paleozoic metallogenicevolutionof southeastern Peru is clarifiedon the basisof the stratigraphic an...the UpperTriassicto LowerJurassic (190-225 Ma) Carabaya batholithin the Inner Arc; magmagenesisresultedfrom...contiguous centralAndeantransects, southeastern Peru differsmarkedlyfrom other areasof the countryin |  | | 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 |  | Pichavant, Michel, Kontak, Daniel J., Briqueu, Louis, Herrera, Jacinto Valencia, Clark, Alan H. (1988) The Miocene-Pliocene Macusani Volcanics, SE Peru. Contributions to Mineralogy and Petrology, 100 (3) 325-338 doi:10.1007/bf00379742 | Journal (article/letter/editorial) | | Springer-Verlag 1988 The Miocene-Piiocene Macusani Volcanics, SE Peru II. Geochemistry and origin of a felsic...1470, Lima 13, Peru Abstract. The Miocene-Pliocene Macusani ash-flow tufts from SE Peru, containing magmatic...fractionated relative to the first erupted. The Macusani magmas are direct products of crustal melting...fail to account for a number of features of the Macusani magmas, aH2o was internally controlled and magma...temperatures (up to 800 ~ C) in the source region. The Macusani magmas are generated as low melt fraction batches |  | Spikings, R., Reitsma, M.J., Boekhout, F., Mišković, A., Ulianov, A., Chiaradia, M., Gerdes, A., Schaltegger, U. (2016) Characterisation of Triassic rifting in Peru and implications for the early disassembly of western Pangaea. Gondwana Research, 35. 124-143 doi:10.1016/j.gr.2016.02.008 | Journal (article/letter/editorial) | | Characterization of Triassic Rifting in Peru and implications for the early disassembly of western...Schaltegger, U., Characterization of Triassic Rifting in Peru and implications for the early disassembly of western...MANUSCRIPT Characterization of Triassic Rifting in Peru and implications for the early disassembly of western...and tectonic setting of the Mitu Rift of southern Peru. The Peruvian Mitu Rift is compared with other Triassic...Proto-Caribbean and Central Atlantic oceans. The Mitu Rift (Peru) was active during ~245 – 240 to ~220 Ma and was |  | | Journal (article/letter/editorial) | | and Triassic Sn–W–(Ag-base metal) metallogenic province, commonly referred to as the Bolivian tin belt...proposal include: (1) the coincidence of the tin province and the Inner Arc in a marked bhumpQ in the Andean...tectonic indentation; (2) the symmetry of the tin province with respect to the Bolivian orocline, the axis...Central Andean tin belt is an elongated metallogenic province, confined to the Eastern Cordillera of the Andean...extending for more than 1000 km from southeastern Peru, through Bolivia, up to northern Argentina (Fig |  | | Journal (article/letter/editorial) | | with SP characteristics are scarce in this vast province (Fig. 1), and the same is true for mafic magmas...Cordillera of Bolivia and Peru (Kari Kari ignimbrite, Schneider, 1987; Macusani volcanics, Pichavant et...Cenozoic volcanic rocks: 1 — Quenamari–Cayconi fields (Macusani ignimbrites; Revancha dyke; San Rafael pluton;...felsic rocks (e.g., granites from Central Spain and Macusani glasses). In the Abdel-Rahman (1994) diagrams...They are similar in this respect to biotites from Macusani glasses (Pichavant et al., 1988a) and from highly |  | | 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) | | 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 |  | 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...mineral resources. Results from the 0.8 Ma Bishop tuff (geothermal) in California, 1.3 to 1.6 Ma Cerro...Mountain tuff (Be, U, F) and 24.6 Ma Pine Grove tuff (Mo) in Utah, and 27.6 Ma Hideaway Park tuff (Mo) in...After each eruption, meteoric water leaches Li from tuff, which drains into playas, where it is concentrated...pegmatite (Congdon and Nash, 1991). Obsidian from Macusani, Peru, has the highest lithium abundance yet reported—of |  | | 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...regarded as a volcanic center to the nearby Atocha tuff units, which therefore represent the unaltered facies...and Harris, 1989), and the strongly peraluminous Macusani tuffs, with inferred metapelitic source, have |  | | Report (issue) | | Geological Survey, Reston, Va.; V. Raul Eyzaguirre, Lima, Peru; Fernando Urquidi B., American Embassy, La Paz,...Argentina, western Boliva, northern Chile, and southern Peru, are potential targets for hydrothermal mineral...volcanism in the central Andean region of southern Peru, northern Chile, western Bolivia, and northwestern...investigations. 1 76" 68' 72° \ 12° 12° PERU Macusani > 16' ijj®...(1984 and the Institute de Geologia y Vh'neria del Peru (1975). 1A Although many papers about the young |  | | Journal (article/letter/editorial) | | CENOZOIC VOLCANISM AND TECTONISM IN T H E ANDES OF PERU Donald C. NOBLE Mackay School of Mines, University...(USA) and Cia. de Minas Buenaventura, S.A., Lima (Peru] Edwin H. M c K E E U.S. Geological Survey, Menlo...major volcanic activity in central and southern Peru, northern Chile, and adjacent areas during the Early...aL, Volcanism and tectonism in the A n d e s o f Peru Pacific basin [3, 7]. Of particular importance...Castrovirryena in Huancavelica Department, central Peru (Fig. 1) [16,17]. This sequence is composed mainly |  | Ericksen, G.E., Smith, R.L., Luedke, R.G., Flores, Mario, Espinosa, Alfredo, Urquidi, Fernando B., Saravia, Fernando (1985) Preliminary geochemical study of ash-flow tuffs in the Morococala and Los Frailes volcanic fields, central Bolivian tin belt. Open-File Report Vol. 1985 (85-258) US Geological Survey doi:10.3133/ofr85258 | Report (issue) | | ash-flow tuffs from the western U. S. and southern Peru ................................ 1 1 4 5 6 8 ABSTRACT...sequences of predominantly quartz latitic ash-flow tuff sheets and minor andesitic to dacitic lavas. The...were determined for what are assumed to be typical tuff sheets representative of both fields; tin values...compositions of unaltered quartz latitic ash-flow tuff sheets that cover part of the central Bolivian tin...geochemical background values with which other samples of tuff sheets with more variable trace-element contents |  | | Journal (article/letter/editorial) | | these unusual eycomb Hills magma body. An underlying tuff (Ttrt) is features,to assesstheir effectson eruption...crystal-liquid rela- underlain by the Kalamazoo Tuff dated at 34 Ma (Hagtions in such magmas that are...obtainable from peg- strum and Gans, 1989). The Kalamazoo Tuff(Tjt) lies unconformably on the Devonian Guilmette...erupted at 4.7 Ma in the eastern Basin and Range province (Lindsey, niently divided into two units, a pyroclastic...elementsby INAA. Separationwas by Crossstratified tuff Kalamazoo use of heavy liquids and a Franz isodynamic |  | | Journal (article/letter/editorial) | | natural samples including a latite, the Peruvian Macusani obsidian, and a topaz rhyolite doped with excess...4 Peralum. 5 F-hpg. P- & F-hpg. 6 P-hpg. Macusani TR8009C8 7 obsidian SiO2 75·10 74·50 71·20...gels and AlPO4. 7 Composition of Macusani obsidian pebble from Peru; sample JV-1 of Pichavant et al....1·96 786 137 Macusani 0·53±0·02 1·44 0·71 0·38 0·6 94-14C 2·00 992 161 Macusani 0·53±0·06 ...1·39 0·66 0·38 0·9 96-8B 2·03 1051 264 Macusani 0·52±0·01 1·17 0·50 0·40 0·2 94-17A 2·00 |  | | Journal (article/letter/editorial) | | southern extension of the Altiplano of southern Peru, Bolivia, and northern Chile, is a high plateau...Dacite 2.03 PANIZOS-CUSI Dacite Porphyry Cusi-Cusi Tuff Poquis12 12.4 Chinchillas Porphy MoretaFm 14 3...15 - - 148 15 8 Tuff Pozuelos C°Lila8-10 b) Ignimbrites 8.95 Ign. 4.2 Tuff Sijes Fm. CCajero4..."inner magmatic arc" is a belt that extends from Peru through the Eastern Cordillera on the ea'stern margin...rocks comes from a 12-Ma age on an ash-flow tuff (Cusi Cusi Tuff) (Ort, 1992) in the overlying pyroclasticepiclastic |  | | Journal (article/letter/editorial) | | volcanic rocks focused mostly on the field near Macusani, Peru, at the northern end of the tin belt (Barnes...American Museum of Natural History, New York; Macusani vitrophyre containing 0·3 wt % H2O) 602 MORGAN...(bounded by dashed lines) and the locations of the Macusani (MAC) and Los Frailles (LF) volcanic fields. ...Tankha caldera about 20 km to the northwest; this tuff sheet covers approximately two-thirds of the field...Stratigraphic positions between sample locations within each tuff unit were not determined, except for sample 85-24 |  | | Report (issue) | | of beryllium tuff at Spor Mountain, and photograph of nodule from the Spor Mountain tuff................to 2.3 percent beryllium, by weight, and volcanic tuff altered by heated circulating waters at Spor Mountain...example, Anjanabonoina pegmatites in Antananarivo Province, Madagascar, which have a mixed NYF–LCT signature... Viseu); Mozambique (at Alto Ligonhain in the Province of Zambezia); Canada (at the Bernic Lake Mine...Tanco Mine — on the shore of Bernic Lake in the Province of Manitoba; and at the James Bay (Lithium One) |  | | Journal (article/letter/editorial) | | 1992)) a natural obsidian glass from the Macusani area, SE Peru (Pichavant et al., 1987) and five synthetic...glasses used in this study Glass Cl' G8’ Ab12’ G7’ Macusani’ Schott I “‘A. Schott 2’“.’ 343-lP 343-2r 343-3”... 1989). See also Silver and Stolper ( 1989). ‘Macusani glass (Pichavant et al., 1987). “This study. “Micromanometric...the glass inclusion from Bishop Tuff and standard glasses Bishop Tuff( H/Si)sIMs R,J (R, + R,) HZOSIMS...8 Standard (H/Si)slMs R,/(R,+R,) (HISi),, Macusani Schott I”’ Schott Ym 343.1 343.3 0.0032 0.0196 |  | | Journal (article/letter/editorial) | | Lombardo 2002) and Miocene-Pliocene Macusani rhyolite from Peru (Pichavant et al. 1988a, 1988b) as intrusive...simple melting relations of the Makalu granite and Macusani rhyolite. Most samples are ferroan, although the...calc-alkalic suite is the 27 Ma Coyote Summit rhyolite tuff member of the Shingle Pass Formation from the central...associated felsic volcanism of the Etendeka-Paraná province. The ~23 km diameter intrusive complex is composed...by partial melting of pelitic rocks (Makalu and Macusani) have Rb abundances (300–600 ppm) (Fig. 4b) that |  | | Journal (article/letter/editorial) | | San Diego County, CA), and rhyolites (e.g., Macusani, Peru) that are enriched in the volatile and incompatible...1991), the Bishop Tuff, California (Mahood and Hildreth 1983), Macusani volcanics, Peru (Pichavant et al...experiments (LaTourrette et al. 1995), filled diamond Macusani, Peru (Pichavant et al. 1987), filled circle Honeycomb...(Crecraft et al. 1981), squares with crosses Bishop Tuff, California (Mahood and Hildreth 1983). Rectangles...Morococala, Bolivia (Morgan et al. 1995). The data from Macusani, Morococala and the experiments are remarkably |  | | Journal (article/letter/editorial) | | values for these same minerals in rhyolite from Macusani, Peru [from table 6 of Pichavant et al. (1988)] (Table... From Icenhower & London (1995). From Macusani rhyolites, Peru (Pichavant et al., 1987). 2 In evolved...et al., 1989) and peraluminous rhyolite from Macusani, Peru (London et al., 1988) measured, among other...F-, B-, and P-rich system represented by the Macusani glass (London et al., 1988). FLUORINE At the...experiments (LaTourrette et al., 1995); Ο, Macusani, Peru (Pichavant et al., 1987); Χ, Honeycomb Hills |  | | Report (issue) | | youngest, consists of a basal non-welded ash-flow tuff; near-source intermediate-composition flows, flow...to 700 feet thick. The basal non-welded ash-flow tuff, which crops out sporadically in the southern Deep...southern Deep Creek Range, isolated outcrops of the tuff (this map; Rodgers, 1987) suggest that its distribution...paleotopography and post-eruption erosion. The source of the tuff is unknown. Separates of millimeter-sized biotite...based on (1) the lack of co-existing sanidine in the tuff, (2) the contrast in size between the muscovite |  | | Journal (article/letter/editorial) | | phenocryst composition ŽMoore, 1970, 1973.. At the Bishop Tuff, USA, the mean biotite IVŽF. s 2.04 ŽHildreth, 1977...early to late stages ŽHildreth, 1979.. At the Macusani felsic peraluminous volcanics, the biotite–apatite...Ploumanac’h granite Bingham latites Bishop Tuff Macusani volcanics Spanish Lamproites Zimbabwe Great...temperature complies with the restitic nature of the Macusani biotites, as claimed by Pichavant et al. Ž1988...chlorine in granitoids from the Basin and Range province, Western United States. Economic Geology 81, 1484–1494 |
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