 | | Report (chapter) | | service click here to receive free e-mail alerts when new articles cite this article Permission request click...Auckland, PB 92019 Auckland Mail Centre 1142, Auckland, New Zealand (e-mail: ie.smith@auckland.ac.nz) Abstract:...Cenozoic arc-type volcanic arc in southeastern Papua New Guinea developed in an environment of complex tectonic...associated low-Mg rocks. The low-Mg rocks are plagioclase-phyric and contain augite and hypersthene with...genetically unrelated to the arc-type rocks in Papua. The high-Mg rocks represent magmas derived by partial |  | | Journal (article/letter/editorial) | | Potassium Calc-Alkaline Rocks from Cape Nelson, Eastern Papua P. d-_~]~ Department of Geology, Australian National...High-K ealo-alkaline rocks from Cape Nelson, eastern Papua are dominated by andesites containing numerous...two Quaternary stratavolcanoes, Mount Victory (1925 metres) and Mount Trafalgar (1720 metres), and several...k-~ ~ c G "~°' : * E ~ '" -----.-'~,~. , New ~' ,-,,~i~ v " ' :.:...':'.~ ~ ~ I 5ol .I~ouga...I Fig. 1. New Guinea and Solomon Island area with location of Cape Nelson volcanoes Mount Victory and |  | Humphreys, M. C. S., Zhang, J., Cooper, G. F., Macpherson, C. G., Ottley, C. J. (2019) Identifying the ingredients of hydrous arc magmas: insights from Mt Lamington, Papua New Guinea. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 377 (2139) 20180018 doi:10.1098/rsta.2018.0018 | Journal (article/letter/editorial) | | hydrous arc magmas: insights from Mt Lamington, Papua New Guinea Research M. C. S. Humphreys, J. Zhang...hydrous arc magmas: insights from Mt Lamington, Papua New Guinea. Phil. Trans. R. Soc. A 377: 20180018...geology, petrology, volcanology Keywords: Mt Lamington, subduction, magma, crystal textures, amphibole...subduction zone magmatism at Mt Lamington volcano, Papua New Guinea. Our approach uses existing trace...melts (AEMs). The AEM compositions show that Mt Lamington andesites and plutonic enclaves are dominated |  | | Journal (article/letter/editorial) | | isotope ratios of Quaternary volcanic rocks from Papua New Guinea R. W. PAGE & R. W. JOHNSON LITHOS . Page...isotope ratios of Quaternary volcanic rocks from Papua New Guinea. Lithos 7, 91-100. Strontium isotope data...volcanic rocks from six separate areas in Papua New Guinea suggest a subdivision into two broad grzups...mantle. Volcanoes of the second group (on the Papua New Guinea mainland) have generally a higher and wider...available for most of the island arcs between Japan and New Zealand, at the we:;tern margin of the Pacific Ocean |  | | Journal (article/letter/editorial) | | Reappraisal of the concept using case histories from Papua New Guinea D i f MACKENZIE I.E.M. SMITH* ) Bureau ...seven late Cenozoic volcanic provinces in Papua New Guinea are used in this paper to identify three volcanic...have minimal significance for the rocks from Papua New Guinea. A preferred system of circumoceanicrock nomenclature...International Union of Geological Sciences (IUGS)], and a new procedure is recommended for the recognition of rock...provinces at convergent plate boundaries in Papua New Guinea. These associations are distinguished on a |  | Zhang, J., Davidson, J. P., Humphreys, M. C. S., Macpherson, C. G., Neill, I. (2015) Magmatic Enclaves and Andesitic Lavas from Mt. Lamington, Papua New Guinea: Implications for Recycling of Earlier-fractionated Minerals through Magma Recharge. Journal of Petrology, 56 (11) 2223-2256 doi:10.1093/petrology/egv071 | Journal (article/letter/editorial) | | Enclaves and Andesitic Lavas from Mt. Lamington, Papua New Guinea: Implications for Recycling of Earlier-fractionated...2015 ABSTRACT Mt. Lamington is a composite, dome-forming volcano in Papua New Guinea, sitting on the Papuan...of the enclaves is dominated by amphibole and plagioclase, similar to the andesitic lava hosts. The textures...PUB, and thus that the PUB contaminated the Mt. Lamington magmas. We demonstrate that this is highly unlikely...assimilation; magmatic enclaves; magma recharge; Mt. Lamington; ophiolite contamination; Papuan Ultramafic Belt |  | Johnson, R. W., Macnab, R. P., Arculus, R. J., Ryburn, R. J., Cooke, R. J. S., Chappell, B. W. (1983) Bamus volcano, Papua New Guinea: Dormant neighbour of Ulawun, and magnesian-andesite locality. Geologische Rundschau, 72 (1) 207-237 doi:10.1007/bf01765907 | Journal (article/letter/editorial) | | Bamus volcano, Papua New Guinea: dormant neighbour of Ulawun, and magnesian-andesite locality By R. W...und die gleiehe Entfemung (70---160 km) yen der New Britain BenioffZone k6nnen Anzeiehen dafiir sein...positions over the same depths (70--160 kin) to the New Britain Benioff *) Authors' addresses: R. W. JOHNSON...MACNAB, Bwagaoia, Misima Island, Milne Bay, Papua New" Guinea; R.J. ARCULUS,Research School of Earth Sciences...Volcanelogieal Observatory, P.O. Bex 886, Babaul, Papua New Guinea; B. W. CHAP~ELL, Department of Geology, Australian |  | | Journal (article/letter/editorial) | | P. Hoblitt Oxidized sulfur-rich mafic magma at Mount Pinatubo, Philippines Received: 16 January 2003...during the early stages of the 1991 eruption of Mount Pinatubo, Philippines, contain amphiboles that crystallized...deposits. Introduction The cataclysmic eruption of Mount Pinatubo on 15 June 1991, was preceded by the extrusion...magmas. Geological background and eruption history Mount Pinatubo is a part of the Luzon arc (Fig. 1), whose...activity, which were followed by the formation of new fumaroles and degassing of increasing amounts of |  | | Journal (article/letter/editorial) | | and a vari able amount of silicic glass. The plagioclase is albitized. Secondary amphibole and mica are...ture, consisting of amphibole, clinopyroxene, plagioclase, K-feldspar and titanomagnetite. The groundmass...standard high-titanium riftogenic shoshonites of Papua New Guinea and northern Kamchatka (Fig. 2). It should...those of Fiji and the alkalic basaltoids of the New Hebrides, which also are related to the ac tivity...5) high-titanium shoshonites of Lamington volcano, Papua New Guinea [12]. Open circles) Paleogene shoshonites |  | | Report (chapter) | | in Papua New Guinea H.L. Davies & A.L. Jaques SUMMARY: The major ophiolite complexes of Papua New Guinea...ophiotite complexes in Papua New Guinea: the April in the west, Marum in the centre, and Papua Ultramafic Belt...setting of each of the complexes, and present some new data for the April complex, and recently acquired...for the Marurn and PUB. We then put forward some new ideas on emplacement of ophiolite which take into...rocks consisting of two pyroxenes and calcic plagioclase, with some olivine, no opaques and no amphibole |  | | Journal (article/letter/editorial) | | Cenozoic volcanic rocks from southeastern Papua New Guinea I. E. M. SMITH AND W. COMPSTON L1THOS Smith...in Cenozoic volcanic rocks ~orn southeastern Papua New Gmnea. L/t/ms, Vol. 15, pp. 1~:g)--206.Oslo. ISSN...episodes of ~ate Cenozoic volcanism in southeastern Papua. Eocene tholeiitic basalts have initial ~Sr/~3r...7041+_2) in contrast to those from the contiguous Papua New Guinea mainland (0.7036-0.7054). This isotopic discontinuity... University of Auckland, Pri~ate Bag. Auckland, New Zealand; W. Compston, Research School of Earth Sciences |  | | Journal (article/letter/editorial) | | has found a single inclusion of anhydrite in plagioclase from a hornblende trachyandesite from Cerro Lanza...trachyandesites from the 1951 eruptions of Mt. Lamington, Papua New Guinea (Taylor, 1958; Arculus et al, 1983),...localities, including El Chichon (Luhr, 1983), Mt Lamington (Taylor, 1958; Arculus et ai, 1983), Santorini...and resulting textures showed abundant relict plagioclase phenocrysts. Subsequent experiments using crimped...subhedral crystalline phases with no relict plagioclase and apparent dissolved H 2 O contents in accord |  | | Journal (article/letter/editorial) | | pyroxene-plagioclase basalts to plagioclase andesite-basalts. They are porphyritic and have plagioclase very...minerals. The microprobe indicates that the plagioclase in the least altered basalt varieties is andesine-labradorite...consists of microlites of clinopyroxene with some plagioclase together with granules of magnetite embedded...phenocryst balance and the occurrence of a new assemblage: plagioclase (60-65%) + clinopyroxene (30-35%) + orthoclase...(<1%). The groundmass is composed mainly of plagioclase, potash feldspar, and clinopyroxene, together |  | | Journal (article/letter/editorial) | | Rutherford (1988) for El Chichon trachyandesite and Mount St Helens dacite show the combined effect of changing...apparently not anhydritesaturated, e.g. the Yn tephra of Mount St Helens (Geschwind & Rutherford 1992), indicating...closely studied in this context. The 1951 Mt Lamington andesite is another example of an anhydrite- ...Pallister et al. 1996). It contained phenocrysts of plagioclase, quartz, hornblende (commonly rimmed with cummingtonite)...shown in Figures 3 and 4. Melt inclusions in plagioclase phenocrysts contain up to 6-4 wt% H 2 O and 80 |  | | Journal (article/letter/editorial) | | igneous minerals including apatite, amphibole, plagioclase, quartz, and titanite. In total, anhydrite inclusions...in a number of recent eruptions, including Mount Lamington, Pinatubo, Lascar, Shiveluch, and Augustine...visible cleavage in amphibole and twinning in plagioclase—were used to select the least altered samples...references therein. Anhydrite inclusions in plagioclase and orthopyroxene from Augustine volcano, previously...investigated a range of phases, including amphibole, plagioclase, clinopyroxene, titanite, and apatite. Crystal |  | | Journal (article/letter/editorial) | | Clinoenstatite in a Volcanic Rock from the Cape Vogel Area, Papua by W. B. D A L L W I T Z , 1 D. H. G R E E N , 2...author (J. E. T.) from Cape Vogel, north-eastern Papua. Clinoenstatite had not previously been found in...ABSTRACT A porphyritic volcanic rock from Cape Vogel, Papua, contains abundant phenocrysts of multiply twinned...Belt and associated volcanic rocks, north-eastern Papua, OPHIOLITIC SUBMARINE SEDIMENTS A N D LAVAS \"i...S EASTERN PAPUA. FIG. 2. Locality map and local geology, Cape Vogel, north-eastern Papua. - 0 CAPE |  | | Journal (article/letter/editorial) | | Volcanic Group, Woodlark Island (Muyuw), eastern Papua I. D. Lindley To cite this article: I. D. Lindley...Volcanic Group, Woodlark Island (Muyuw), eastern Papua, Australian Journal of Earth Sciences, 63:6, 731-754...Volcanic Group, Woodlark Island (Muyuw), eastern Papua I. D. Lindley Research School of Earth Sciences...calc-alkaline to shoshonitic Okiduse Volcanic Group (new name). It provides an exposure of upper Cenozoic...Watou Mountain Eruptive Centre (new name) and the Uvarakoi Caldera (new name). The mafic–intermediate Watou |  | | Journal (article/letter/editorial) | | augite and hornblende, with microphenocrysts of plagioclase. The water-saturated phase relations reproduce...apatite, olivine and augite, with scattered plagioclase microphenocrysts. On the lower slopes of the...above (but with less augite), and hornblende and plagioclase as unambiguous phenocrysts. The lava emitted...western Mexico (Wallace & Carmichael, 1992), Papua New Guinea (Ruxton, 1966; Arculus et al., 1983), and...Mexico, Luhr & Carmichael (1985); Mount Lamington, Papua New Guinea, Arculus et al. (1983)]. This is in |  | | Journal (article/letter/editorial) | | compilation emphasizes the dominance of calcic plagioclase (labradorite-anorthite) amongst the phenocryst...between total rock AI20 a and modal phenocrystic plagioclase (found in all data groups, except hornblende...by plagioclase, and interpreted to occur under relatively low pressures. Dominance of plagioclase suggests...index ( > 3 7 ) and to a lesser extent normative plagioclase (>Anso), but using only groundmass compositions...themselves divided on the basis of normative plagioclase composition. Irvine and Baragar [5] suggest criteria |  | | Book (edition) | | INCLUDING MATERIAL FROM THE TERRITORY OF PAPUA AND NEW GUINEA GERMAINE A. JOPLIN, B.A., PH.D., D.Sc...stabilization. The great ultramafic thrust plate in Eastern Papua (Chapter 15), possibly some of the Alpine ultramafic...rocks from some parts of the Territory of Papua and New Guinea is also included in this edition and affects...the composition of the plagioclase differs only in the groundmass. 3 Plagioclase typically zoned. Cores...thank Dr N. H. Fisher for allowing me to include New Guinea and Papuan material collected by members of the |  | | Journal (article/letter/editorial) | | volo/ophenocrysts of (in order of decreasingabundance)plagioclase(3 mm), biotite (1.5 mm), greenhornblende(< I...Monzonite porphyry contains -35 volo/ophenocrystsof plagioclase (-3 mm), K-feldspar (-8 mm), biotite (1.5 mm)...trachybasalts,and cognate inclusions of Mount Lamington, Papua New Guinea: Anhydriteamphibole-bearinglavas and...p.260-290. Princeton University Press,Princeton, New Jersey. Wyman, D.A., and Kerrich, R. (1987) Archean |  | | Report (issue) | | taken February 1983 by Maurice Krafft. Upper right: Mount St. Helens Dome, Washington, viewed from the south...Arizona. Contents Growth of the lava dome at Mount St. Helens, Washington, (USA), 1981-1983 ......rhyolite lava flows in the Snake River Plain volcanic province, southwestern Idaho... Bill Bonnichsen and Daniel...predictable, extrusion of dacite lava in the crater of Mount St. Helens. Second, renewed deformation and seismicity...(and recently observed at Mount St. Helens) are “endogenous,” in which new lava is added to the interior; |  | | Journal (article/letter/editorial) | | rates by measuring microscopic dissolution of plagioclase minerals in exposed rock surfaces. While there...fraction consisted of volcanic glass (36%), plagioclase (29.9%), glassy aggregates (27.5%), pyroxene-amphibole...variable thickness of glass coating microlites of plagioclase (;70%) and ferromagnesian (;30%) minerals. The...similar to the bulk tephra (Table 1) and the plagioclase was of andesine composition with a Ca/Na atomic...(White and Claassen, 1980; White, 1983) and plagioclase minerals at steady state (10216 – 10214 mol/cm2/s) |  | | Journal (article/letter/editorial) | | Centre in New Zealand’s Taupo Volcanic Zone contain olivine, clino- and orthopyroxene, and plagioclase xeno-...inclusions in clinopyroxene, orthopyroxene and plagioclase as well as matrix glasses are rhyolitic to dacitic...Mineral zoning in olivine, clinopyroxene and plagioclase suggest that fractional crystallization occurred...Taupo Volcanic Zone (TVZ) in the North Island of New Zealand marks the surface expression of the magmatic...172:33 subduction of the Pacific Plate beneath New Zealand’s North Island (Graham et al. 1995; Stern |  | | Journal (article/letter/editorial) | | K-group elements relative to LREE, highly calcic plagioclase (to An 93 ), and Cr-rich spinels (cr-number^80)...clinopyroxene and olivine in the proportions 73: 27 Plagioclase is a late crystallizing phase and has an insignificant...accumulation. Average olivine, clinopyroxene, and plagioclase contents are 5-3, 17-4 and 18-3% respectively...textures with low-temperature, post-cumulus phases (plagioclase, augite, and titanomagnetite) in the interstices...the larger phenocrysts and cumulus crystals. Plagioclase phenocrysts are small ( |
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