 | | Journal (article/letter/editorial) | | basalt--andesite--dacite association, rich in plagioclase and by- and Q-normative. East of Lombok, the...the volcanic rocks of Tambora and Sangeang Api on Sumbawa belong to a potassic ne---trachybasalt--trachyandesite...Benioff-zone depths, but both the Tambora and the Sangeang Api associations are far more potassic than would...among the lowest for the Sunda arc, but from Sangeang Api (0.70460--0.70500) are significantly higher...Mid-Atlantic Ridge, may also occur in the Birunga province, and might not arise from processes unique to |  | | Journal (article/letter/editorial) | | helium isotopes: Examples from the Sunda arc, Indonesia M. Gasparon a, D.R. Hilton b,1, R. Varne a a Geology...central Sumatra and Sumbawa in the Sunda arc of Indonesia. Olivine crystals in mantle xenoliths (lherzolite)...number of volcanic centres in the Sunda arc of Indonesia. We show that because 3 H e / 4 H e ratios can...quasi-continental in composition and thickness in west Java, whereas it is oceanic in thickness and probably...a matrix of augite, plagioclase and olivine, and lack phenocrysts of plagioclase, hypersthene and hydrous |  | | Journal (article/letter/editorial) | | A suite of lavas erupted in 1985–1986 from Sangeang Api volcano in the Sunda arc are characterised by... degassing raises the solidus and increases plagioclase stability thereby forcing crystallisation such...369 0.035 0.122 0.059 Galunggung Galunggung Sangeang Api 1982 1982 1985 [13] [13] [13] 49.14 49.01...011 – 1.086 0.777 0.119 0.016 Sangeang Sangeang Sangeang Sangeang 1985 1985 1985 1985 [14] [14] [14]...SA2 SA2 duplicate SA10 48076 SA88/303 SA9 Api Api Api Api 10.318 7.927 10.180 8.824 17.41 33.00 19 |  | | Journal (article/letter/editorial) | | district in the Sunda Arc, South Western Sumbawa, Indonesia Marco L. Fiorentini • Steve L. Garwin Received:...Sunda arc in the Batu Hijau district, Sumbawa, Indonesia. The low-K calc-alkaline magmatic suite in the...Hijau porphyry district in southwestern Sumbawa, Indonesia (Figs. 1, 2). We argue that the whole-rock radiogenic... from the well-defined Java Trench to 123 the west to a series of shallow troughs (Timor Trough) and...subducting slab increases from *55o to 65oN from west to east across the margin of the Roo Rise, as indicated |  | | Journal (article/letter/editorial) | | from the Gangdese area and Quill, Pelée, and Sangeang Api volcanoes) that differentiate at high pressures...replacement of Cpx, and the crystallization of plagioclase may be suppressed. This crystallization sequence...primary basalt samples with high Dy/Yb ratios from Sangeang Api (Fig. 10a of Wang et al. 2019), of which originated...potassic magma evolution beneath Sangeang Api volcano, East Sunda arc, Indonesia. Journal of Petrology 44, 491-515 |  | | Journal (article/letter/editorial) | | (Varekamp 1979). The Roman Volcanic Region, Italy Indonesia Edgar recommends the hypothesis of Ninkovich...approximately equal depth to the Benioff Zone are plagioclase-rich, hyand Q-normative rocks of the basalt-andesite-dacite...trachybasalts and trachyandesites (Tambora and Sangeang Api volcanoes); ne- and lc-normative leucitites...the Sunda arc lavas. However, the lavas from Sangeang Api (0.70460-0.70500) are significantly higher and...Catalogue of active volcanoes of the World, Part I. Indonesia, 271 pp, Int Volc Assoc Rome Ninkovieh D, Hays |  | | Journal (article/letter/editorial) | | of liquids which coexist with this amphibole. Plagioclase is the anhydrous liquidus phase between 1 atm...liquid coexist with clinopyroxene or olivine (+_ plagioclase), do resemble those of naturally occurring low-silica...Foden amphibole + clinopyroxene _+ olivine + plagioclase + liquid is one in which the liquid is buffered...liquids will rise, eventually to fractionate plagioclase-rich assemblages yielding silicarich andesite...influence is that of the combined crystallisation of plagioclase + augite + olivine + magnetite (POAM) from parental |  | | Journal (article/letter/editorial) | | 226 Ra-disequilibrium crystallization ages of plagioclase and alkali-feldspar Alessandro Fabbrizio a,⁎...February 2009 Editor: R.W. Carlson Keywords: Plagioclase alkali-feldspar partition coefficients Ra–Th model...for plagioclase and alkali-feldspar in equilibrium with silicate melts. In anorthitic plagioclase, alkalis...albitic plagioclase Na is compatible, whereas Ca and Sr are always compatible in plagioclase. Dplagioclase/melt...is 0.55 ± 0.01. Dalkali-feldspar/melt Ra For plagioclase, DRa and XAn are related as RT lnDRa [kJ/mol] |  | | Journal (article/letter/editorial) | | highlighting the complex magmatic records preserved in plagioclase phenocrysts, and the di¡erent, much younger record...Hawaii, 1955, P is Parinacota, Chile, SA is Sangeang Api, Indonesia, and the data sources are [28,29,36,37...on Hawaii [28] up to 3000 years from Sangeang Api in Indonesia, the Tonga arc and Mount St. Helens [29^31]...recently studies have used di¡usion of Sr and Ba in plagioclase feldspars [13,23], and Fe and Mg in clinopyroxenes...clinopyroxenes [24]. The di¡usion of Ca and Na in plagioclase is slow compared to that for Sr and Ba [46]. The |  | Wang, Jun, Wang, Qiang, Dan, Wei, Yang, Jin-Hui, Yang, Zong-Yong, Sun, Peng, Qi, Yue, Hu, Wan-Long (2019) The role of clinopyroxene in amphibole fractionation of arc magmas: Evidence from mafic intrusive rocks within the Gangdese arc, southern Tibet. Lithos, 338. 174-188 doi:10.1016/j.lithos.2019.04.013 | Journal (article/letter/editorial) | | (2) small crystals of Type-2 clinopyroxene, plagioclase, and biotite within the host. Textural and geochemical...basaltic melts can reduce the stability field of plagioclase relative to ferromagnesian silicates (e.g., pyroxene...Jurassic–early Tertiary igneous rocks define an east–west-trending Andean arc-type ACCEPTED MANUSCRIPT magmatic...fine-grained matrix (0.2 to 1.0 mm) CE consisting of plagioclase (Pl; ~30–50 vol.%), Cpx (~20–40 vol.%), biotite...subterrane in an area between Daggyai Co in the west and Jiacha in the east (Ma et al., 2017; Meng et |  | | Journal (article/letter/editorial) | | precursory Cpx (Wang et al., 2019). Furthermore, plagioclase did not crystallize with Amp (and Type-1 Cpx)...[The potassic magmas of the Sangeang Api Volcano, East Sunda Arc, Indonesia (Turner et al., 2003) also...magma evolution beneath Sangeang Api volcano, East Sunda arc, of Indonesia. Journal of Petrology 44 |  | | Report (chapter) | | Ruapehu, New Zealand, Price et al. 2007; Sangeang Api, Indonesia) yield similar conclusions to that presented...crystallization ages obtained by Cooper & Reid (2003) for plagioclase (c. 2 –4 ka) and pyroxene (c. 0.15 – 5.7 ka)...Helens (and other volcanoes such as Ruapehu and Sangeang Api), because differentiation and cooling appear...potassic magma generation at Sangeang Api volcano, east Sunda arc, Indonesia. Journal of Petrology, 44, |  | Price, Richard C., Smith, Ian E.M., Stewart, Robert B., Gamble, John A., Gruender, Kerstin, Maas, Roland (2016) High-K andesite petrogenesis and crustal evolution: Evidence from mafic and ultramafic xenoliths, Egmont Volcano (Mt. Taranaki) and comparisons with Ruapehu Volcano, North Island, New Zealand. Geochimica et Cosmochimica Acta, 185. 328-357 doi:10.1016/j.gca.2015.12.009 | Journal (article/letter/editorial) | | Island. Egmont (Mt. Taranaki) is located on the west coast of the North Island and 29 Ruapehu lies...Ruapehu xenoliths are predominantly pyroxene-plagioclase 33 granulites derived from Mesozoic meta-greywacke...Gabbroic xenoliths (Group 1) are composed of 37 plagioclase, clinopyroxene and amphibole whereas ultramafic...olivine (Group 4). In 39 Group 1 xenoliths plagioclase and clinopyroxene and in some cases amphibole...Volcano (2518 m) is located in Taranaki province on the west coast of New 145 Zealand’s North Island |  | | Journal (article/letter/editorial) | | ankaramitic arc magmas from Lombok (Sunda arc, Indonesia): Mineral and melt inclusion evidence Marlina...N 1) from Rinjani volcano, Lombok (Sunda arc, Indonesia) contain phenocrysts of clinopyroxene and olivine...ankaramitic basalt samples from the island of Lombok (Indonesia), and the melt inclusions in their olivine crystals... (unpublished); squares: samples from the north-west coast of Lombok (near the village of Obel–Obel)...clinopyroxene crystals and scarce small (b0.5 mm) plagioclase crystals, set in a fine-grained groundmass of |  | | Journal (article/letter/editorial) | | differentiation at Gede Volcanic Complex, West Java, Indonesia Heather Katherine Handley • Colin G. Macpherson...Volcanic Complex (GVC) of the Sunda island arc (West Java, Indonesia) consists of multiple volcanic centres and...small-degree compositional zoning observed in plagioclase phenocrysts of all eruptive groups (up to *20...the mid- to lower crust, and fractionation of plagioclase, clinopyroxene, Fe–Ti oxide ± olivine ± orthopyroxene...the geochemical character of the moderately thick West Javan arc crust is relatively immature compared |  | | Journal (article/letter/editorial) | | and trace element variations at Salak Volcano, Indonesia Heather K. Handley a,⁎, Jon P. Davidson a, Colin...Floor, Jalan Asia Afrika No. 8, Jakarta 10270, Indonesia a r t i c l e i n f o Article history: Received...s t r a c t Volcanic rocks from Salak Volcano in West Java display intriguing minor and trace element...incompatible behaviour during fractionation of plagioclase, clinopyroxene and Fe-Ti oxide ± orthopyroxene...within the single volcanic centre at Salak Volcano in West Java, and so this volcano provides a great opportunity |  | | Journal (article/letter/editorial) | | igneous minerals: olivine, pyroxenes, amphibole, plagioclase, the partition coefficients for Pb are expected...resulting in Ra becoming compatible. Accumulation of plagioclase has been frequently cited as a possible source...Cunningham et al., 2009; Berlo et al., 2006) and plagioclase separates can indeed have 210Pb excess (Bennett...2006, 2008b). Addition of a young population of plagioclase crystals to a magma could therefore result in...in 210Pb excesses. However the amount of plagioclase crystals required to create the observed excesses |  | | Journal (article/letter/editorial) | | elemental geochemistry of primitive magmas from Indonesia–Australia collision zone Marlina Elburg a,b,⁎...Subduction Mineral chemistry Arc-continent collision Indonesia A B S T R A C T Melt inclusions within forsterite-rich...olivine crystals in two mixed magmas from the Indonesia–Australia collision zone provide information on...lava contains phenocrysts of complexly zoned plagioclase, green–brown hornblende, biotite, resorbed quartz...consists of a vesicular network of elongated plagioclase and hornblende (0.1–0.5 mm) with very little |  | Altherr, Rainer, Topuz, Gültekin, Siebel, Wolfgang, Şen, Cüneyt, Meyer, Hans-Peter, Satır, Muharrem, Lahaye, Yann (2008) Geochemical and Sr–Nd–Pb isotopic characteristics of Paleocene plagioleucitites from the Eastern Pontides (NE Turkey) Lithos, 105 (1) 149-161 doi:10.1016/j.lithos.2008.03.001 | Journal (article/letter/editorial) | | clinopyroxene, analcime (former leucite), Ti-magnetite, plagioclase, sanidine, apatite and accessory biotite. The...plagioleucitite with phenocrysts of clinopyroxene and plagioclase, but not of leucite. Analcimized leucite is,...Ti-magnetite, analcime (leucite), sanidine, plagioclase, apatite and altered glass. Type-II rocks are...fine-grained groundmass of clinopyroxene, Ti-magnetite, plagioclase, sanidine, analcime (leucite) and accessory biotite...Ti-magnetite and plagioclase are embedded in a groundmass of sanidine, plagioclase, leucite (analcime) |  | | Journal (article/letter/editorial) | | uranium-series disequilibria thorium–radium dating plagioclase pyroxene trace-element partitioning a b s t...the phases analyzed by Zellmer and coauthors (plagioclase, pyroxene, and magnetite). Therefore, either...been documented experimentally in the case of plagioclase (Miller et al., 2007; Fabbrizio et al., in press)...whole rocks; diamonds, pyroxene; triangles, plagioclase; squares, magnetite. Filled black and grey symbols...caption to Table 1. proposed in the case of rapid plagioclase growth due to degassing during magma ascent that |  | | Journal (article/letter/editorial) | | representative particles include glass, 82 plagioclase, quartz, alkali feldspar, albite, spinels, iron...ferrokaersutite, kaersutite, ferro-edenite and plagioclase, as 182 well as Ti-augite, apatite, anorthoclase...wt.%), olivine (Fo77-80, CaO = 0.4–1.0 wt.%), plagioclase 187 (An40-66, FeO = 1.2 wt.%), titanomagnetite...58 – 68 wt.%; Na2O + K2O = 7.6 – 9.4 wt.%), plagioclase (An33-57, FeO = 0.14 – 0.34 200 wt.%), titanomagnetite...comparable 224 to alkali feldspar (Na-rich plagioclase or anorthoclase). The most abundant “matrix” |  | | Journal (article/letter/editorial) | | similar and composed essentially of clinopyroxene, plagioclase, alkali feldspar, and Fe–Ti oxides. The analytical...and mafic xenoliths (in vol.%) AZ Host basalt Plagioclase K-feldspar Host basalt 55% An77–57 3.5–0.3...Views dominated by coarse plates of untwinned plagioclase (Plg) and clinopyroxene (CPX). E.S. Farahat...thickness of about 140 cm and trending north 80° west. The dyke is highly fractured and intensively weathered...scale bars are 1.0 mm long. a) A large blade of plagioclase (Plg) showing irregular extinction poikilitically |  | Snyder, Darin C., Widom, Elisabeth, Pietruszka, Aaron J., Carlson, Richard W., Schmincke, Hans-Ulrich (2007) Time scales of formation of zoned magma chambers: U-series disequilibria in the Fogo A and 1563 A.D. trachyte deposits, São Miguel, Azores. Chemical Geology, 239 (1) 138-155 doi:10.1016/j.chemgeo.2007.01.002 | Journal (article/letter/editorial) | | is extinct) in the east and Sete Cidades in the west (hachured lines mark calderas). The eastern and...Parinacota, Chile; T is Toba Tuff; SA is Sangeang Api, Indonesia. Data from Volpe and Hammond (1991), Reagan...controls of the partitioning of Sr and Ba between plagioclase feldspar, silicate melts, and hydrothermal solutions...gene- 155 ration beneath Sangeang Api volcano, east Sunda arc, Indonesia. Chem. Geol. 44, 491–515. Vasquez |  | | Journal (article/letter/editorial) | | (filled circles) and those from the Asal rift and Sangeang Api in the Sunda arc. After George et al. 2004 ...al. (2003) analysed U–Th–Ra disequilibria in plagioclase separates from a number of volcanoes and found...(partially crossed polars) of olivine crystals in a plagioclase-rich matrix. The positions of two electron microprobe...contrast, Zellmer et al. (1999) used Sr zoning in plagioclase crystals from St. Vincent (Lesser Antilles) and...major- plus trace-element zoning in olivine and plagioclase (see data compilation in Costa and Chakraborty |  | | Journal (article/letter/editorial) | | for the three measured minerals (phlogopite, plagioclase, and K-feldspar). While there are a number of...phlogopite, leucite (Fabbrizio et al., 2008), plagioclase Fig. 4. Semi-logarithmic plot of (a) DRa and...cpx = clinopyroxene, phl = phlogopite, plg = plagioclase, lc = leucite, ap = apatite. The bold lines on...variation for K-feldspar (Ab100Or0–Ab0Or100) and plagioclase (Ab100An0–Ab0An100). The bold lines connecting...variation of DRa and of DRa/DBa for K-feldspar and plagioclase, calculated with T = 1000 °C, in function of |
|
