 | | 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) | | basalt-rhyolite volcanic products display tschermakitic pargasite (37%), magnesiohastingsite (32%) and magnesiohornblende...whereas for magnesiohastingsite and tschermakitic pargasite species, H2Omelt uncertainties can be as high...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 |  | | 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 |  | 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) | | active arcs (Avacha of Kamchatka arc and Iraya of Luzon–Taiwan arc) to fertile spinel lherzolite of highpressure...replacement by the continental lherzolite at the region of backarc to continental margin. Asthenospheric...Asthenospheric upwelling beneath the continental region, which has frequently occurred at the Western Pacific, has...Continental margin 1. Introduction The Western Pacific region has been one of the most mobile zones, having had...Takahashi, 1978a; Aoki, 1987). The Western Pacific region is especially noteworthy to provide peridotite |  | | 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 |  | | 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) | | , 2009). The Caraja¤s province is part of the Central Amazonian province (Tassinari & Macambira, 2004)...material is formed of centimeter-sized euhedral pargasite to magnesium-hornblende crystals (Fig. 3e and...four localities with a portable drill core. The central parts of the cores exhibit no apparent interaction...Rio Maria suite is a Mg-hornblende; subordinate pargasite and Mg-hastingsite occur in the layered rocks...1998). As an example, the experimental work on the Pinatubo dacite discussed below comes from a study of a |  | | Report (chapter) | | eruptions, such as E1 Chich6n in 1982 or M o u n t Pinatubo in 1991, have illustrated how volcanic events...However, although minor, this species plays a central role in the monitoring of active volcanoes because...identified for the 1991 Pinatubo eruptions. The huge SO2 cloud released by Mount Pinatubo cannot be accounted...al. (1998b) worked with the dacite from the Mount Pinatubo 1991 eruption. The haplogranite compositions...magmatic differentiation is eruptions of Mount St Helens, Mount Pel6e, accompanied by a decrease in temperature |  | | Report (chapter) | | available elsewhere, except Iraya volcano, in the Philippines (see Arai et al. 2007). The volcanic front is...ARAI Fig. 1. Schematic map of the Kamchatka arc region, modified from Ishimaru et al. (2007, fig. 1)....been also reported from Iraya volcano, Luzon arc, Philippines (e.g. Arai et al. 1996, 2004). Arai et...the xenoliths suite from the Iraya volcano, Philippines (almost 90% of the total). There is no difference...C-type peridotites are variable in chemistry from pargasite through edenite to magnesiohornblende, and have |  | Kiss, Balázs, Harangi, Szabolcs, Ntaflos, Theodoros, Mason, Paul R. D., Pál-Molnár, Elemér (2014) Amphibole perspective to unravel pre-eruptive processes and conditions in volcanic plumbing systems beneath intermediate arc volcanoes: a case study from Ciomadul volcano (SE Carpathians) Contributions to Mineralogy and Petrology, 167 (3) doi:10.1007/s00410-014-0986-6 | Journal (article/letter/editorial) | | the youngest volcano in the Carpathian–Pannonian region produced crystal-rich high-K dacites that contain...is the youngest volcano of Carpathian–Pannonian region and referred as a potentially active volcano (Szakács...the southeastern edge of the Carpathian–Pannonian region, and this is the youngest 123 Contrib Mineral...sketch map of the Carpathian–Pannonian region in Eastern-Central Europe. The cross-hatched areas show the...(kfp); a small pargasite (parg) microphenocryst with thin opaque rim. c, d Pargasite crystal overgrowth |  | | Journal (article/letter/editorial) | | shallow conditions (P up to *1 GPa). Kaersutite and pargasite are species almost exclusively found in alkaline...Ecuador; Apacheta-Aguilucho Volcanic Complex, Andean Central Volcanic Zone, Chile; Cerro Jeu-Jepén pluton,...magnesiohornblende (Mg-Hbl), tschermakitic pargasite (Tsc-Prg), pargasite (Prg), magnesiohastingsite (Mg-Hst)... tschermakitic pargasite ([4]Al [ 1.5, Ti \ 0.5 and A(Na ? K) B 0.5 apfu), pargasite s.s. (hereafter...(hereafter pargasite; [4]Al [ 1.5, Ti \ 0.5, A (Na ? K) [ 0.5 apfu and [6]Al C Fe3?), magnesiohastingsite ([4]Al |  | | Journal (article/letter/editorial) | | of the dacite that chamber ascended through the central part of the conduit that suffered low shear stress...breakage of phenocrysts during magma ascent along the region of high shear stress near the conduit walls. The...deposits: the 1991 eruption products of Pinatubo, Philippines (Pallister et al., 1996; Polacci et al.... 2005; Rosi et al., 2004). Both eruptions, at Pinatubo and Quilotoa, are characterized by crystal rich...~ 6 10 wt% Al2O3) and lath shaped, Al2O3 rich pargasite phenocrysts (Mg# 64.7 69.2, ~ 11.5 14 wt% Al2O3) |  | | Report (chapter) | | volcanic field and the Tancı́taro– Nueva Italia region in the Mexican Arc from Ownby et al. (2008, 2011)...on the compositions of rocks erupted in a given region or from a given magmatic system. As crustal conditions...erupted compositions 261 Mount St. Helens (n=240) 20 Mount Hood (n=107) 12 Mount Jefferson (n=48) 44...GEOROC database for Mount St Helens, Mount Hood, and Mount Jefferson. Data for Mount Hood also include...volcanism. This idea originated from a study of Mount Hood, Oregon, and this andesitic volcano provides |  | RodrÍguez, Carolina, Sellés, Daniel, Dungan, Michael, Langmuir, Charles, Leeman, William (2007) Adakitic Dacites Formed by Intracrustal Crystal Fractionation of Water-rich Parent Magmas at Nevado de Longaví Volcano (36·2°S; Andean Southern Volcanic Zone, Central Chile) Journal of Petrology, 48 (11) 2033-2061 doi:10.1093/petrology/egm049 | Journal (article/letter/editorial) | | Volcano (3628S; Andean SouthernVolcanic Zone, Central Chile) UNIVERSITE¤ DE GENE'VE, DE¤PARTEMENT DE...chemically distinct from other evolved magmas of the region in that they have high La/Yb (15^20) and Sr/Y (60^90)...plate margins originates in the high-temperature region of the asthenospheric mantle wedge as a consequence...position of the SVZ relative to the Northern, Central, and Austral Volcanic zones (NVZ, CVZ, and AVZ...primarily of thick andesitic flows that radiate from a central vent. Basalts and basaltic andesites predominate |  | Tang, Gong-Jian, Wang, Qiang, Wyman, Derek A., Li, Zheng-Xiang, Zhao, Zhen-Hua, Yang, Yue-Heng (2012) Late Carboniferous high εNd(t)–εHf(t) granitoids, enclaves and dikes in western Junggar, NW China: Ridge-subduction-related magmatism and crustal growth. Lithos, 140. 86-102 doi:10.1016/j.lithos.2012.01.025 | Journal (article/letter/editorial) | | Granitoid Enclave Dike Crustal growth Ridge subduction Central Asian Orogenic Belt a b s t r a c t We report...the Keramay area, of the western Junggar region of Central Asian Orogenic Belt (CAOB). Zircon U–Pb dating...granites. All granitoids, enclaves and dikes in this region have high positive εNd(t) (+ 7.13 to + 9.74) and...between crust- and mantle-derived magmas. The Central Asian Orogenic Belt (CAOB), also known as “the...2000). (b) Geological map of the western Junggar region (Tang et al., 2010). (c) Simplified geological map |  | | Journal (article/letter/editorial) | | investigated: (1) MSH–Yn−1 dacite (SiO2: 65 wt%) from Mount St. Helens’ voluminous Yn tephra and (2) MSH–Yn−1...abundance. Communicated by Timothy L. Grove. Keywords Mount St. Helens · Dacite · Inverse experiments · Amphibole...large central volcanoes of the Cascades magmatic arc, USA (Hildreth 2007), particularly at Mount St. Helens...dacite (Hildreth 2007). The eruptive history of Mount St. Helens goes back ~300 ka, with smallvolume eruptions...Holocene (Mullineaux 1986, 1996; Clynne et al. 2008). Mount St. Helens’ largest known eruption produced the |  | | Report (chapter) | | Society, London, Memoirs Chapter 19 Magma storage region processes of the Soufrière Hills Volcano, Montserrat...Library on June 23, 2014 Chapter 19 Magma storage region processes of the Soufrière Hills Volcano, Montserrat...indicate that magma in the pre-existing magma storage region had been heated from approximately 825 to 835 8C...Potentially, global heating of magma in the storage region may influence magma rheology and eruptive styles...that the minimum pressure in the magma storage region was 130 MPa. This corresponds to an estimated depth |  | | Journal (article/letter/editorial) | | expressed by the occurrence of pargasite (up to 20 vol.%) and phlogopite. Pargasite is characterized by low...aggregates with pargasite-rich veinlets. Samples used for this study consist of harzburgite, pargasite spinel...spinel lherzolite, and phlogopite – pargasite spinel lherzolite (Table 1), and their mineral chemistry and...lherzolite and minor dunite, harzburgite, and pargasite-bearing pyroxenite (Francis 1976, 1978, Roden...basanites less than 1 million years old and include pargasite-bearing spinel lherzolite, with or without phlogopite |  | | Journal (article/letter/editorial) | | linear variation from ferro-edenite, edenite to pargasite from rhyolite to andesite. Pargasitic amphibole...which correspond to a depth of 410 km for storage region of the crust. The fO2 values vary from 14.25 to...as North Anatolian Strike Slip Fault Zone. This region recorded a northward subducting oceanic lithosphere...et al., 1997; S- engör et al., 2003). In this region, first collision-related volcanism ARTICLE IN...Leake et al., 1997) in ferro-edenite, edenite and pargasite. The mineralogical parameters are (CaBX1.5), (Na+K)AX0 |  | | Journal (article/letter/editorial) | | stratocone situated on the eastern edge of the Central Kamchatka Depression, where the Shchapinsky graben...historically active volcanoes (open triangles), the Central Kamchatkan Depression (dark shading), the Kamchatka...orthopyroxene, Fe-Ti oxides, and hornblende. Shaded region represents range of pre-eruptive temperatures based...based on Fe-Ti oxide geothermometry. Patterned region is estimated pre-eruption storage conditions where...varied significantly over the past 4000 years at Mount St Helens (USA), where magma emplacement depths |  | | Journal (article/letter/editorial) | | overgrowth on olivine, and by the presence of pargasite and occasionally phlogopite in ultramafic xenoliths...3 wt.% in the magma in its upper mantle source region (Sakuyama, 1979; Skirius et al., 1990; Schiano...Pre-eruption vapor in magma of the climactic Mount Pinatubo eruption: Source of the giant stratospheric...Fire and Mud: Eruptions and Lahars of Mount Pinatubo, Philippines In: (eds. R. S. Punongbayan and C. G...(1984) A magmatic geohygrometer, application to Mount St. Helens and other dacitic magmas. Geology 12 |  | | Journal (article/letter/editorial) | | cone-forming volcanism in the north and south, and a central region characterized by rhyolitic caldera-forming...1). Since the inception of volcanism in this central region, 1.6 Ma, >6000 km3 of rhyolitic magma has erupted...Location of the central Taupo Volcanic Zone (TVZ) North Island, New Zealand. (b) The central Taupo Volcanic...classified as magnesiohastingsite, rather than pargasite based on the low Alvi content relative to estimated...proposed a model for rhyolite petrogenesis in the central TVZ, which highlighted: (1) the importance of amphibole |  | Shimizu, Kei, Liang, Yan, Sun, Chenguang, Jackson, Colin R.M., Saal, Alberto E. (2017) Parameterized lattice strain models for REE partitioning between amphibole and silicate melt. American Mineralogist, 102 (11) 2254-2267 doi:10.2138/am-2017-6110 | Journal (article/letter/editorial) | | geochemistry of the 1991 eruption products of Mount Pinatubo. In R.S. Punongbayan and C.G. Newhall, Eds...Fire and Mud: Eruptions and lahars of Mount Pinatubo, Philippines, 767–797. University of Washington Press...determination of trace-element partitioning between pargasite and a synthetic hydrous andesitic melt. Earth...changing magma storage prior to explosive eruptions of Mount St. Helens volcano. Bulletin of Volcanology, 57(1)...2(2), 173–480. Heliker, C. (1995) Inclusions in Mount St. Helens dacite erupted from 1980 through 1983 |  | Nagasaki, Shiho, Ishibashi, Hidemi, Suwa, Yukiko, Yasuda, Atsushi, Hokanishi, Natsumi, Ohkura, Takahiro, Takemura, Keiji (2017) Magma reservoir conditions beneath Tsurumi volcano, SW Japan: Evidence from amphibole thermobarometry and seismicity. Lithos, 278. 153-165 doi:10.1016/j.lithos.2017.01.011 | Journal (article/letter/editorial) | | earthquakes occur at depths up to ~12.5 km in the general region around the volcano (Figure 2). The aseismic zone...similar to that observed beneath Pinatubo volcano in the Philippines (Hammer and Rutherford, 2003; Mori...as quartz and olivine, magnesiohornblende and pargasite, and calcic and sodic plagioclases. The bulk SiO2...and examined the relationships among them; the region between the broken NU lines in Figure 8a indicates...of the group-I and group-II melts are within the region of natural magmas, indicating that the estimated |
|
