 | | 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) | | porphyry Cu-Au mineralization at the Dizon mine, Philippines William P. Midea1 | Keiko Hattori1 | Gabriel...Sciences, University of the Philippines Diliman, Quezon City, Philippines Correspondence William P. Midea...geothermobarometry, Fe-Ti oxide geothermobarometry, Luzon arc, magma oxidation, magmatic hydrothermal activity...Au-rich porphyry Cu deposit in the Luzon arc, Philippines. The Luzon arc hosts many young, <10 Ma, porphyry...the water contents. 2 | R EGIONAL G EOLOG Y The Luzon arc formed in response to the eastward subduction |  | | Journal (article/letter/editorial) | | Southeast Porphyry Cu-Au Deposit, Mankayan, Philippines Akira IMAI Abstract: The Lepanto Far Southeast...Cu-Au deposit in Mankayan, Benguet Province, Philippines. The principal orebody consists of potassic alteration...heterogeneous entrapping in the two-fluid unmixing region. Sulfur isotopes of aqueous sulfide and sulfate...associated magmatic hydrothermal deposits in the western Luzon arc. The Lepanto Far Southeast (FSE) porphyry Cu-Au...Mineral District, Benguet Province, northern Luzon, Philippines (e.g., Gonzalez, 1956; Garcia, 1991). A set |  | 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...2006 Abstract The dacite pumice erupted from Mt. Pinatubo on June 15, 1991 (whole-rock, rhyolitic groundmass...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 |  | | 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...(Williams et al. 1990), or Mount Pinatubo (Westrich and Gerlach 1992). Mount Pinatubo injected an estimated...magnetite + ilmenite in hydrous hornblende- and biotite-bearing plutonic rocks. The Cajon Pass suite, therefore...systems such as El Chichón, Nevado del Ruiz, and Mount Pinatubo. GEOLOGY OF GRANITIC ROCKS IN THE CAJON PASS |  | | 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) | | Susceptibility:A Case Study from the Barberton Region, South Africa Shunso Ishiharal, Laurence J. Robb2...collection of Archaean granitoids of the Barberton region using a portable KT5 magnetic susceptibilitymeter...entire range of Archaean granitoids in the Barberton region, housed at the Economic Geology Research Institute...these plutons comprise fine- to medium-grained biotite-bearing (10-15%) tonalite and trondhjemite (Robb...containing upto 25% hornblende, in addition to biotite (Robb et al., 1986). The TTG suite varies greatly |  | Reich, Martin, Parada, Miguel A., Palacios, Carlos, Dietrich, Andreas, Schultz, Frank, Lehmann, Bernd (2003) Adakite-like signature of Late Miocene intrusions at the Los Pelambres giant porphyry copper deposit in the Andes of central Chile: metallogenic implications. Mineralium Deposita, 38 (7) 876-885 doi:10.1007/s00126-003-0369-9 | Journal (article/letter/editorial) | | giant porphyry copper deposit in the Andes of central Chile: metallogenic implications Received: 12 November...the Los Pelambres giant porphyry copper deposit, central Chile (32S). Located within the southern portion...Keywords Adakites Æ Giant porphyry copper deposits Æ Central Andes Introduction The genetic link between magmatism...crust (Cathles 1981; Sawkins 1990). The Andes of central Chile host some of the world’s largest porphyry...black line), and the volcanic gap separating the Central Volcanic Zone (CVZ) and the Southern Volcanic Zone |  | | Journal (article/letter/editorial) | | of amphibole, plagioclase (An30 – 50), quartz, biotite, sphene, magnetite, and apatite, plus anhydrite...by Jones et al. (1967). Igneous activity in the region began in the Late Cretaceous with the intrusion...plagioclase (f 20 vol.%), amphibole (f 5 vol.%), biotite (f 5 vol.%), and quartz (f 2 vol.%) disseminated...assemblage plagio- 151 clase + amphibole + quartz + biotite + magnetite + sphene + apatite + anhydrite F K-feldspar...Strongly altered; some grains rounded 20 Anhydrite Biotite Magnetite K-feldspar Decomposed to an orange-brown |  | | Journal (article/letter/editorial) | | Porphyry and Lepanto Epithermal Cu–Au Deposits, Philippines Jeffrey W. HEDENQUIST,1,2 Antonio ARRIBAS R.1...world-class Far Southeast (FSE) porphyry system, Philippines, includes the FSE Cu–Au porphyry deposit, the...hypersaline liquid formed potassic alteration (biotite) near sea level. The S isotopic composition of...the Mankayan mineral district of northern Luzon, Philippines (Hedenquist et al., 1998). The Lepanto high-sulfidation...Dating of alunite in the lithocap and hydrothermal biotite of the porphyry deposit indicate the same age, |  | 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) | | 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) | | THE GEOLOGY OF LUZON, P.I. WARREN D. SMITH, PH.D. Chief of Division of Mines, Bureau of Science, Manila...INTRODUCTION PHYSIOGRAPHY The CoastalPlains The Central Plain The Albay Plain The Intermediate Uplands...ECONOMIC Coal Iron Oil Gold Copper INTRODUCTION Luzon is the largest island of the Philippine group and...mining field, evidence is already abundant that Luzon will before many years have a place in the very...very first rank. Finally, M'anila, the capital of Luzon, through her Bureau of Science, an institution not |  | de Ignacio, Cristina, Castiñeiras, Pedro, Márquez, Álvaro, Oyarzun, Roberto, Lillo, Javier, López, Iván (2003) El Chichón Volcano (Chiapas Volcanic Belt, Mexico) Transitional Calc-Alkaline to Adakitic-Like Magmatism: Petrologic and Tectonic Implications. International Geology Review, 45 (11) 1020-1028 doi:10.2747/0020-6814.45.11.1020 | Journal (article/letter/editorial) | | much resembling adakitic magmas (e.g., the 1991 Pinatubo eruption). We propose that these rocks were generated... 1987; Fig. 1A). In contrast with the typical Central America volcanic arc, the Chiapas volcanic belt...0020-6814/03/700/1020-9 $25.00 canic belt from the westernmost Central American volcanoes and from the Mexican volcanic...the atmosphere (compared with 20 Mt of SO2 by Mount Pinatubo in 1991; Pasteris, 1996). Another remarkable...setting of volcanic belts in southern Mexico and Central America. See location of the Chiapas volcanic belt |  | XIAO, Bo, QIN, Kezhang, LI, Guangming, LI, Jinxiang, XIA, Daixiang, CHEN, Lei, ZHAO, Junxing (2012) Highly Oxidized Magma and Fluid Evolution of Miocene Qulong Giant Porphyry Cu-Mo Deposit, Southern Tibet, China. Resource Geology, 62 (1) 4-18 doi:10.1111/j.1751-3928.2011.00177.x | Journal (article/letter/editorial) | | rocks, particularly those rich in hornblende or biotite, appear to have crystallized at oxygen fugacity...in Mexico (Luhr et al., 1984) and Mount Pinatubo in the Philippines (Bernard et al., 1991). The Qulong...of Lhasa city, the capital of Tibet Autonomous Region and 45 km north of the YarlungTsangpo River (the...Miocene intrusions observed is: granodiorite, biotite monzogranite, monzogranitic porphyry, granodiorite...and biotite (10 vol. %). Accessory minerals are zircon, apatite, magnetite and sphene. The biotite monzogranite |  | | Journal (article/letter/editorial) | | the Dizon Porphyry Cu-Au Deposit, Zambales, Philippines Akira IMAI* Department of Earth and Planetary...porphyry Cu-Au deposit in western central Luzon, Zambales, Philippines, is documented in terms of mineral...enveloped by chlorite alteration overprinting biotite alteration, 2) stockwork quartz veinlets with chalcopyrite...system. Keywords: Dizon, porphyry Cu deposit, Philippines, Luzon, fluid inclusion, hydrothermal system, sulfur...Au-rich porphyry Cu deposits in the western Luzon arc, Philippines (Bureau of Mines and Geosciences (BMG) |  | | Report (chapter) | | a function of the pressure in the magma storage region, the physical properties of the magma, such as...such as OH, CO2 and S in their structure, e.g., biotite, hornblende, and Fe-sulfide, and these phenocrysts...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 |  | | Journal (article/letter/editorial) | | S as SO2− (Fig. 2). For example, Mount Pinatubo in the 4 Philippines is well known for its anhydrite phenocrysts...its flank (Hattori & Keith, 2001). Magmas for the Pinatubo eruption products had high fO2, above FMQ + 2...geothermobarometry by Zhang and Audétat (2017); Pinatubo from Hattori (1993), Scaillet and Evans (1999)...submarine volcanic rocks, forming the Green Tuff region of propylitic alteration from Hokkaido to Kyushu...associated Lepanto high sulfidation Au deposit in Philippines, were formed at approximately 1.4 Ma (Arribas |  | Cao, MingJian, Hollings, Pete, Cooke, David R., Evans, Noreen J., McInnes, Brent I.A., Qin, KeZhang, Li, GuangMing, Sweet, Gabe, Baker, Mike (2018) Physicochemical Processes in the Magma Chamber under the Black Mountain Porphyry Cu-Au Deposit, Philippines: Insights from Mineral Chemistry and Implications for Mineralization. Economic Geology, 113 (1) 63-82 doi:10.5382/econgeo.2018.4544 | Journal (article/letter/editorial) | | under the Black Mountain Porphyry Cu-Au Deposit, Philippines: Insights from Mineral Chemistry and Implications...deposit in the Baguio district, Northern Luzon (Philippines) is associated with late Miocene to Pliocene...Introduction The Baguio district of Northern Luzon, Philippines (Fig. 1A) is considered one of the world’s...Yonsei University user 64 CAO ET AL. 18O 120O Luzon 123O Fig.B Manila 126O A 120O32' 120O34'...granodiorite Pliocene & Pleistocene intrusions Central Cordillera diorite complex Mafic Dike complex |  | | Journal (article/letter/editorial) | | on a Pleistocene adakite from Mindanao in the Philippines have been used to establish near-liquidus and...relationships relevant to conditions in the East Philippines subduction zone. The experimental starting material...Adakite Volcanic arc Crystal fractionation Philippines Surigao Introduction Adakite is a term applied...an adakite from the Surigao peninsula in the Philippines, where adakitic rocks are prevalent (see Sajona...archipelago (Fig. 1). At its northern end, in southeast Luzon, the arc is fully mature but in its southern part |  | Cooke, D. R., Deyell, C. L., Waters, P. J., Gonzales, R. I., Zaw, K. (2011) Evidence for Magmatic-Hydrothermal Fluids and Ore-Forming Processes in Epithermal and Porphyry Deposits of the Baguio District, Philippines. Economic Geology, 106 (8) 1399-1424 doi:10.2113/econgeo.106.8.1399 | Journal (article/letter/editorial) | | and Porphyry Deposits of the Baguio District, Philippines DAVID R. COOKE,1,† CARI L. DEYELL,1,* PATRICK...7001, Australia 2 Anglo American Exploration Philippines Inc., 1101 Pearlbank Centre Building, 146 Valero...Salcedo Village, Makati City, Metro Manila, Philippines Abstract The Baguio district contains a diverse...plate and the Scarborough Ridge beneath northern Luzon over the past 3 m.y. Rapid uplift and exhumation...sulfidation epithermal veins of the southern and central Baguio district are mostly between +1 and +6 per |  | | Journal (article/letter/editorial) | | andesite-rhyolite 5–40 B20 B5 B25 tr Iriga Philippines Basalt-andesite 7–23 B5 B10 1–9 Btr B2...1–5 B1 11 12 Lassen Mt. Bulusan California Philippines Andesite-dacite Basaltic andesite-rhyolite ...Basalt tr-24 B4 B12 B8 B3 B1 20 Pinatubo Philippines Basalt-dacite 13–29 9–35 B6 B19 21...orthopyroxene, Oxides magnetite and ilmenite, Bi biotite, K-feld Kfeldspar, Qtz quartz tr trace amounts...Reventador, Ecuador; Shiveluch, Kamchatka; Pinatubo, Philippines; Rindjani, Indonesia; Egmont, New Zealand) |  | | Journal (article/letter/editorial) | | assemblage is dominated by amphibole^plagioclase^biotite and epidote minerals, all of inferred magmatic...The Mg/(Mg þ Fe) ratios of both amphibole and biotite indicate fO2 conditions in the range NNO þ 0·5...ignition at 10008C. The compositions of amphibole, biotite and epidote were determined by electron microprobe..., 2009). The Caraja¤s province is part of the Central Amazonian province (Tassinari & Macambira, 2004)...saussuritized plagioclase and contain amphibole biotite magmatic epidote as their principal mafic minerals |  | Schaarschmidt, Anna, Klemd, Reiner, Regelous, Marcel, Voudouris, Panagiotis C., Melfos, Vasilios, Haase, Karsten M. (2021) The formation of shoshonitic magma and its relationship to porphyry-type mineralisation: the Maronia pluton in NE Greece. Lithos, 380. 105911pp. doi:10.1016/j.lithos.2020.105911 | Journal (article/letter/editorial) | | beneath Eurasia since the Cretaceous, and the Aegean region (Fig. 1) has been extending since 35 Ma due na...Oligocene sediments and volcanic rocks in the central part and by greenschist-facies rocks of the Circum...contain clinopyroxene, orthopyroxene, plagioclase, biotite, apatite, amphibole, K-feldspar and minor olivine...the monzodiorite are plagioclase, clinopyroxene, biotite, Kfeldspar, apatite, amphibole, zircon, magnetite...to 2 mm in size) of plagioclase, pyroxene and biotite are surrounded by large interstitial K-feldspar |  | | Journal (article/letter/editorial) | | (Nielson 1976), the USA (Nielson 1979), and the Philippines (Sillitoe and Gappe 1984). Corbett and Leach...high-temperature core (>700◦ C to ∼500◦ C) rich in biotite and potassium feldspar (‘potassic alteration’)...(‘phyllic alteration’), which in turn grades into a region of lower temperature, greenschist facies metamorphism...outward from a central source only a couple of hundreds of metres across. In most deposits, biotite and magnetite...most distinguishing attribute is feldspar- and biotite-destructive ‘alteration halos’ that are of a lighter |
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