 | | Journal (article/letter/editorial) | | of Porphyry Cu Deposits of the Western Luzon Arc, Philippines: K-Ar ages, SO3 Contents of Microphenocrystic...the following porphyry Cu deposits in the western Luzon arc are determined: Lobo-Boneng (10.5±0.4 Ma), Santo...associated with porphyry Cu deposits in the western Luzon arc contains sulfur as SO3 detectable by electron...magmatism of the western Luzon arc, from tonalitic rocks of the Luzon Central Cordillera of about 15 Ma...Ma to an active magmatism at Mount Pinatubo. Thus, the western Luzon arc has been generating porphyry |  | | Journal (article/letter/editorial) | | (southwestern Hokkaido through northeastern Honshu to central Honshu), Izu-Bonin arc, Kyushu-Palau ridge, Southwest...were compared to those from the Western Luzon arc, Philippines, to better understand the metallogenesis...associated with porphyry Cu deposits in the Western Luzon arc contain >0.1 wt% S as SO3. Such high SO3 contents...in the Western Luzon arc, from 15 Ma old tonalitic plutonic rocks of the Luzon Central Cordillera to present-day...present-day volcanism at Mount Pinatubo. The accessory apatite in intrusive rocks associated with porphyry |  | Oyarzun, Roberto, Márquez, Alvaro, Lillo, Javier, López, Ivan, Rivera, Sergio (2001) Giant versus small porphyry copper deposits of Cenozoic age in northern Chile: adakitic versus normal calc-alkaline magmatism. Mineralium Deposita, 36 (8) 794-798 doi:10.1007/s001260100205 | Journal (article/letter/editorial) | | the 1991 anhydrite-rich dacitic pumice of Mount Pinatubo, Philippines; this volcanic eruption led to massive...turn, be regarded as the plutonic equivalents to Pinatubo-type volcanic rocks (Pasteris 1996). Porphyry...temperatures above the stability ®eld of pyrite (e.g., Mount Pinatubo; Imai et al. 1996), the dominant sulfur mineral...Rye (1993); Imai et al. (1996). L Luzon porphyries; P Mount Pinatubo; Ch El ChichoÂn; H hematite; S sulfur;...LB Lomas Bayas; SG Sierra Gorda. Mount Pinatubo: average 1991 pumice (after Bernard et al. 1996). Fields |  | Borisova, Anastassia Yu., Pichavant, Michel, Polvé, Mireille, Wiedenbeck, Michael, Freydier, Remi, Candaudap, Frédéric (2006) Trace element geochemistry of the 1991 Mt. Pinatubo silicic melts, Philippines: Implications for ore-forming potential of adakitic magmatism. Geochimica et Cosmochimica Acta, 70 (14) 3702-3716 doi:10.1016/j.gca.2006.04.030 | Journal (article/letter/editorial) | | element geochemistry of the 1991 Mt. Pinatubo silicic melts, Philippines: Implications for ore-forming potential...13 April 2006 Abstract The dacite pumice erupted from Mt. Pinatubo on June 15, 1991 (whole-rock, rhyolitic...minimum of 100 t Au and 5 · 105 t Cu from the Mt. Pinatubo magma. Our data suggest that intrusives having...Cl, Sr/Y, Pb/Ce, Mo/Ce, As/Ce and Sb/Ce in Mt. Pinatubo melts reflect the contribution of deep fluids derived...et al., Trace element geochemistry of the Mt. Pinatubo silicic melts 1997; Mungall, 2002). Understanding |  | | Report (chapter) | | site of the Bataan Nuclear Power Plant, the Philippines A. M. F. LAGMAY1*, R. RODOLFO1, H. CABRIA1, J...Science, University of the Philippines, Diliman, Quezon City 1101, the Philippines 2 Marine Science Institute...Science, University of the Philippines, Diliman, Quezon City 1101, the Philippines 3 Clermont Université...Development, University of the Philippines, Diliman, Quezon City 1101, the Philippines *Corresponding author (e-mail:...sector of Mount Natib, a potentially active volcano in the Bataan volcanic arc in western Luzon, is the |  | | Journal (article/letter/editorial) | | Oxidized sulfur-rich mafic magma at Mount Pinatubo, Philippines Received: 16 January 2003 / Accepted:...early stages of the 1991 eruption of Mount Pinatubo, Philippines, contain amphiboles that crystallized...releasing sulfur from the melt are not applicable to Pinatubo. Instead, the oxidized state of the dacitic magma...reflects that of parental mafic magma and the source region in the sub-arc mantle. Our results fit a model in...disproportionate sulfur output during the 1991 Mt. Pinatubo eruption suggests that oxidized mafic melt is an |  | Jakubowski, Ryan T., Fournelle, John, Welch, Sue, Swope, R. J., Camus, Patrick (2002) Evidence for magmatic vapor deposition of anhydrite prior to the 1991 climactic eruption of Mount Pinatubo, Philippines. American Mineralogist, 87 (8) 1029-1045 doi:10.2138/am-2002-8-901 | Journal (article/letter/editorial) | | prior to the 1991 climactic eruption of Mount Pinatubo, Philippines RYAN T. JAKUBOWSKI,1,* JOHN FOURNELLE...ABSTRACT Anhydrite (CaSO4) phenocrysts from Mount Pinatubo pumices show evidence of having responded dynamically...the magma at depth. At least a portion of the Pinatubo anhydrite phenocrysts provided substrates for...such as Nevado del Ruiz (Fournelle 1990) and Mount Pinatubo. It has been predicted experimentally that...1984). Mount Pinatubo pumice: chemistry and mineralogy Beginning in mid-March 1991, Mt. Pinatubo, a composite |  | | Journal (article/letter/editorial) | | km3 of dacitic tephra at Pinatubo Volcano on the Philippine island of Luzon ( Scott et al., 1996; Wolff...Wolff and Hoblitt, 1996). Based on TOMS data, the Pinatubo SO2 cloud was estimated at 14 to 26 Mt (Krueger...temperature of 800 to 850°C. In the case of the 1991 Pinatubo dacites, conventional sulfur isotopic measurements...anhydrite and chalcopyrite crystals from the 1991 Pinatubo eruption by ion microprobe. For the andesitic...eruption cloud (Krueger et al., 1995), and fresh pumice contained ⬃1.2 wt.% SO3, almost entirely in the |  | Yoshikawa, Masako, Tamura, Akihiro, Arai, Shoji, Kawamoto, Tatsuhiko, Payot, Betchaida D., Rivera, Danikko John, Bariso, Ericson B., Mirabueno, Ma. Hannah T., Okuno, Mitsuru, Kobayashi, Tetsuo (2016) Aqueous fluids and sedimentary melts as agents for mantle wedge metasomatism, as inferred from peridotite xenoliths at Pinatubo and Iraya volcanoes, Luzon arc, Philippines. Lithos, 262. 355-368 doi:10.1016/j.lithos.2016.07.008 | Journal (article/letter/editorial) | | peridotite xenoliths at Pinatubo and Iraya volcanoes, Luzon arc, Philippines Masako Yoshikawa, Akihiro...peridotite xenoliths at Pinatubo and Iraya volcanoes, Luzon arc, Philippines, LITHOS (2016), doi: 10...R Philippines IP as inferred from peridotite xenoliths at Pinatubo and Iraya volcanoes, Luzon arc...Volcanology and Seismology (PHIVOLCS), Quezon City, Philippines d Faculty of Science, Fukuoka University, Fukuoka...Sciences, University of the Philippines, Diliman, Quezon City 1101, Philippines Christchurch City Council |  | | Journal (article/letter/editorial) | | and one calc-alkaline composition) from the Philippines. The experiments were performed over a fO2 range...and epithermal and porphyry-type deposits is the central question addressed in this paper. We approach the... (2005; see below), all from the North Luzon arc, Philippines (Fig. 1a; bulk rock compositions in Table...Table 1). Recent (<20 Ma) magmatism in the North Luzon arc is linked to the current subduction of the South...rocks selected all come from this recent North Luzon magmatism. They have ages < 3 Ma (Table 1). Diorite |  | | Journal (article/letter/editorial) | | explosive eruptions such as El Chichón (1982) and Pinatubo (1991) have found that the S contents determined...(approximately 1 cm thickness) from eruptions at Pinatubo (Luzon, Philippines) in 1991, Tambora (Sumbawa, Indonesia)...Ash-fall volumes from historic eruptions such as Pinatubo (~2 km3, second biggest in 20th century) and Tambora...and bury the landscape with a layer of ash and pumice fragments up to 200 m thick. During emplacement...merely 20 times the amount of SO2 produced by Pinatubo in 1991, or about Gaseous Products The large |  | | Report (issue) | | eastern front of the Sierra Nevada mountains in central California. Volcanic gases can also severely damage...example, USGS scientists studying the gases of Mount St. Helens have determined that about a total of...the climactic May 18 eruption. Careful study of Mount St. Helens gases using chemical sensors installed...generated by the eruption of Mount Pinatubo, a volcano in the Philippines Luzon volcanic arc, on June 12...12,1991. The climactic eruption of Mount Pinatubo occurred three days later on June 15,1991, and was one |  | Oyarzun, Roberto, Márquez, Alvaro, Lillo, Javier, López, Ivan, Rivera, Sergio (2002) Reply to Discussion on "Giant versus small porphyry copper deposits of Cenozoic age in northern Chile: adakitic versus normal calc-alkaline magmatism" by Oyarzun R, Márquez A, Lillo J, López I, Rivera S (Mineralium Deposita 36:794–798, 2001) Mineralium Deposita, 37 (8) 795-799 doi:10.1007/s00126-002-0286-3 | Journal (article/letter/editorial) | | LE La Escondida; SG Sierra Gorda. Mount Pinatubo: average 1991 pumice (after Bernard et al. 1996). Fields... the Andean chain should be wider in southern central Chile, and obviously this is not the case. Magma... and the Ollague and Pinatubo volcanoes. (i) Initial Ollague Volcano Pinatubo Volcanoa Chuquicamatab...know that the major thickening process in the Central Andes took place during the Late Cenozoic, i.e...data from 15 andesite–dacite stratovolcanoes from central Chile, which suggest melting, assimilation, storage |  | | Journal (article/letter/editorial) | | understanding volatile enrichment mechanisms is central to understanding the driving forces of explosive...by the eruptions of El Chichón in 1982 and Mount Pinatubo in 1991. In both of these events, gases and...presence of anhydrite microphenocrysts in silicic pumice (e.g., Luhr et al. 1984; Pallister et al. 1996)...(Williams et al. 1990), or Mount Pinatubo (Westrich and Gerlach 1992). Mount Pinatubo injected an estimated...systems such as El Chichón, Nevado del Ruiz, and Mount Pinatubo. GEOLOGY OF GRANITIC ROCKS IN THE CAJON PASS |  | | Journal (article/letter/editorial) | | 381–411 1999 The 15 June 1991 Eruption of Mount Pinatubo. I. Phase Equilibria and Pre-eruption P–T–f...ejected during the 15 June 1991 eruption of Mt Pinatubo, to define the pre-eruption conditions of this...the dacite was already oxidized. KEY WORDS: Pinatubo; sulfur; arc-magmas; f O2; water INTRODUCTION...Mt) ejected in the 15 June 1991 eruption of Mount Pinatubo and the ensuing climatic effects (Bluth et...of S-bearing phase relations in arc magmas. The Pinatubo volcano ejected between 6000 and 10 000 Mt of |  | | Journal (article/letter/editorial) | | (Fig. 1). Krakatau and Guntur are located in the central sector of the Sunda arc, where oceanic crust of...are frequent. The lavas from the parasitic and central craters all have similar compositions. Samples...7 S 74 +4.1 4 +4.5 9 +3.4 2.4 +3.2 historic pumice fall historic lava £ow 53.1 1.21 17.2 50.3 1.10...430^2450 ppm in slab-derived melts in the Luzon arc, Philippines [9]. It is therefore reasonable to assume...inclusions in mantle xenoliths from Batan Volcano in the Luzon arc [9]. Addition of V0.75% sediment-derived £uid |  | Segschneider, B, Landis, C.A, Manville, V, White, J.D.L, Wilson, C.J.N (2002) Environmental response to a large, explosive rhyolite eruption: sedimentology of post-1.8 ka pumice-rich Taupo volcaniclastics in the Hawke's Bay region, New Zealand. Sedimentary Geology, 150 (3) 275-299 doi:10.1016/s0037-0738(01)00200-7 | Journal (article/letter/editorial) | | sedimentology of post-1.8 ka pumice-rich Taupo volcaniclastics in the Hawke’s Bay region, New Zealand B. Segschneider...ignimbrite from the Taupo Volcanic Centre in the central North Island of New Zealand produced a f30 km3...decades after its emplacement. In the Hawke’s Bay region in the eastern North Island, three large rivers...no systematic chronological trend towards lower pumice contents in these fluvial facies. Four characteristic...controlled by the unusual hydrodynamic properties of pumice, particularly its low and variable density. Automated |  | Hidalgo, Paulo J., Vogel, Thomas A., Rooney, Tyrone O., Currier, Ryan M., Layer, Paul W. (2011) Origin of silicic volcanism in the Panamanian arc: evidence for a two-stage fractionation process at El Valle volcano. Contributions to Mineralogy and Petrology, 162 (6) 1115-1138 doi:10.1007/s00410-011-0643-2 | Journal (article/letter/editorial) | | May 2011 Ó Springer-Verlag 2011 Abstract In the Central American Volcanic Arc, adakitelike volcanism has...magma-type as well as to contrast its origin with other Central American silicic magmas. The Quaternary volcanic...K2O/Na2O, when compared with other Quaternary Central American volcanics at similar SiO2. These chemical...research is part of a series of studies in the Central American Volcanic Arc (CAVA) that focus on the...Vogel et al. 2004, 2006; Deering et al. 2007). This region is of importance because it has developed some |  | | Journal (article/letter/editorial) | | evolution recorded in plagioclase zoning in 1991 Pinatubo eruption products Kirxo Hlrronrr lxo Hrnoaxr...Plagioclase,the most abundant phenocrystat Mount Pinatubo, displaysvarying textures and compositions...abundant in the gloundmass glass. White dacitic pumice, the most voluminous product of the June 15 eruption... The interiors of phenocrysts from the dacitic pumice and the dome-forming andesite are remarkably similar...microlites in the groundmassglassof the June l5 dacitic pumice indicate rapid magma ascentduring the eruption |  | | Journal (article/letter/editorial) | | elsevier.com/locate/epsl The impact of the 1991 Mount Pinatubo tephra fallout on the geochemical environment...September 2001 Abstract Seven years after the 1991 Mount Pinatubo eruption, the current geochemical environment...a program to reconstruct and model the 1991 Mount Pinatubo tephra fallout and to monitor the recolonization...evaluated by mathematical simulations. 1.1. The Mount Pinatubo eruption of 1991 In June of 1991, a series...series of magmatic explosions occurred at Mount Pinatubo, Philippines, which progressively evolved into a climactic |  | | Report (issue) | | is "blown to bits", producing volcanic ash and pumice instead of lava flows. 5) The volcanic history...Rhyolite Canyon Tuff is a vast layer of welded ash and pumice that is found throughout the Chiricahua Mountains...in 1883 and the eruptions of Mount St. Helens in 1980 and Mt. Pinatubo in 1991 look small by comparison...Valley caldera, near Mammoth Mountain in east-central California, and calderas in Yellowstone National...surrounding landscape. 1. July 22,1980 eruption of Mount St. Helens view from the south. Photo byR.L. Christiansen |  | Manville, V., Segschneider, B., Newton, E., White, J.D.L., Houghton, B.F., Wilson, C.J.N. (2009) Environmental impact of the 1.8 ka Taupo eruption, New Zealand: Landscape responses to a large-scale explosive rhyolite eruption. Sedimentary Geology, 220 (3) 318-336 doi:10.1016/j.sedgeo.2009.04.017 | Journal (article/letter/editorial) | | Volcaniclastics Fluvial sedimentology Taupo ignimbrite Pumice Lahar a b s t r a c t Large-scale ignimbrite eruptions...exemplified here by the 1.8 ka Taupo eruption in the central North Island of New Zealand. This eruption generated...(2009) 318–336 319 Fig. 1. Geological map of the central North Island, New Zealand, showing the river systems...et al., 1979), Mount St. Helens (Major et al., 2000; Major and Mark, 2006) and Pinatubo (Newhall and Punongbayan...at 1.8 ka from the Taupo Volcanic Zone in the central North Island of New Zealand, using information |  | | Report (chapter) | | a function of the pressure in the magma storage region, the physical properties of the magma, such as...volcanoes there is good evidence for a magma storage region in the crust, a magma reservoir from which the... including Mount St. Helens (Scandone and Malone 1985), Mount Pinatubo in the Philippines (Pallister...such reservoirs did exist at 3-5 and >8 km under Mount Rainier at the time of its most recent (2,200 years...seismic evidence generally indicates a magma storage region in the crust or near the crustmantle boundary. |  | | Journal (article/letter/editorial) | | from Mount Pinatubo (Philippines), Volcán Popocatépetl (Mexico), Satsuma– Iwojima (Japan) and Mount St...Fe–S–O melt, degassing, magma mixing, Pinatubo, Popocatépetl, Mount St. Helens, Bingham, Tintic, Satsuma–Iwojima...suite d’échantillons provenant du mont Pinatubo (Philippines), du volcan Popocatépetl (Mexique), Satsuma–Iwojima...Tower, 8741 Paseo de Roxas Blvd., Makati City, Philippines 1233 38#5-oct.00-2188-12 1233 23/11/00, 13:14...Fe–S–O immiscible, dégazage, mélange de magmas, Pinatubo, Popocatépetl, mont St. Helens, Bingham, Tintic |  | | Journal (article/letter/editorial) | | controls on the formation of mafic enclaves or banded pumice Benjamin J. Andrews • Michael Manga Received:...mixing can occur in a fluid manner to produce banded pumice or in a brittle manner to form enclaves. We propose...computed tomography analysis demonstrates that banded pumice from the 1915 Mt. Lassen eruption lacks crystal...dikes should generate fluid mixing and form banded pumice within days to weeks of emplacement. Similar relationships...apply to other modeled magmatic systems, including Pinatubo, Unzen, and Ksudach/Shtuybel’ volcanoes. For all |
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