 | | Journal (article/letter/editorial) | | Fluorine iron biotite from the Honeycomb Hills rhyolite, Utah: The halogen record of decompressionin a...salt I-akecity, utah 84112-l183, ABSTRACT Topaz rhyolite of the Honeycomb Hills, Utah, contains Fe-rich...erupted lavas (-60lo), which form the overlying dome. Values of .fr,o in the pyroclastic sequencerange...bars, whereasthey are less (25-425 bars) in the dome. The ratio of fr,o/f* is an order of magnitude higher...biorangeinabundancefrom l0o/oinearly r the interior of the dome' Accessory s microphenocrystsor inclusions in biclude |  | | Journal (article/letter/editorial) | | Abstract. Basaltic lava flows and high-silica rhyolite domes form the Pleistocene part of the Coso volcanic...< 5 0 % SiO2) were erupted well away from the rhyolite field at any given time. Compositional variation...containing up to 58% SiO2, erupted adjacent to the rhyolite field, formed by mixing of basaltic and silicic...erupted near the Sierra Nevada fault zone. Several rhyolite domes in the Coso volcanic field contain sparse...commingling and local diffusive mixing of andesite and rhyolite at contacts, concentric vesicle distribution, |  | | Journal (article/letter/editorial) | | the formation of large volumes of high-silica rhyolite. SUMMARY OF THE GEOLOGIC HISTORY The Los Humeros...span the compositional range from high-silica rhyolite to basalt. During the last 0-46 Ma, three major...mantle-derived basalts. The volumetric predominance of rhyolite in the early history of the center points to a...Eruption of Teziutlan lavas Eruption of precaldera rhyolite domes Eruption of Xaltipan Ignimbrite Collapse...began ~ 0-47 Ma ago with extrusion of high-silica rhyolite domes (Fig. 1). Shortly thereafter, at 0-46 Ma |  | | Journal (article/letter/editorial) | | + + + -"--- ...... Antlclme showmg cresthne Dome Syncilne, showmg troughhne BaSIn StTlke and dIrectIon...suite are subaqueous silicic volcanic and include rhyolite flows, domes, breccias, tuffs and epiclastic rocks...the following upward-grading stratigraphy: rhyolite dome, vent facies, white exhalite that includes disseminated...polyphase deformation is evident in the basin-and-dome structures in the center of the study area and the...amphibole and mica, which ranges in composition from annite through biotite to phlogopite. Secondary iron oxide |  | | Journal (article/letter/editorial) | | deposits are in or adjacent to calderas or rhyolite lava-dome fields and are hydrothermal. Almost all are...district, Oregon are hosted by weakly peraluminous rhyolite domes and tuffs and are highly enriched in epithermal...newly recognized, westernmost topaz Žperaluminous. rhyolite in the US, are also trace element enriched; gangue...Wyoming, and Texas ŽFinch, 1997.. However, U-rich rhyolite or ash was demonstrably the source of U for most...calderas, and still others are associated with rhyolite intrusions or flows unrelated to calderas. The |  | | Journal (article/letter/editorial) | | Springer-Verlag1986 Rise and fall of a basalt-trachyte-rhyolite magma system at the Kane Springs Wash Caldera...from a chamber zoned from fayalite-bearing alkali rhyolite near 820 ~ C at the roof to a trachytic "dominant...crystallizing magma chamber formed biotite-beating rhyolite in isolated pockets. The most evolved of these...because both mildly peralkaline and metaluminous rhyolite magmas were erupted from this center at different...extension over a broad area of the Basin and Range province in the last 17 Ma (Christiansen and McKee 1978) |  | | Journal (article/letter/editorial) | | olivine basalt parents, to produce a relatively Na- Province. At least five major, differentiated silicic rich...sequences exposed in the canyon country dacite and rhyolite. Within some individual silicic centres, dis-...basalthistory of volcanic development in any individual rhyolite compositional spectrum. Reverse zoning of plagioclase... from basalt to rhyolite rather than the predominantly bimodal (basalt and rhyolite) volcanism characteristic...trachyte, in addition to andesite, dacite and rhyolite (Best & Brimhall, 1974; Le Bas et al., 1986). |  | | Book (edition) | | Graphicraft Limited, Hong Kong Printed and bound in Italy by G. Canale & C. S.p.A., Turin For further information... . . . . . . . . . . . . . . . . . . Superior Province . . . . . . . . . . . . . . . . . . . . . . ....MID-PROTEROZOIC TECTONISM AND MAGMATISM Grenville Province . . . . . . . . . . . . . . . . . . . . . . ....16 3.61 4.37 0.07 32.87 1.02 25.44 30.07 4.76 RHYOLITE 2.00 1.03 0.42 7.40 885 66.91 0.55 15.92 1...minerals, such as apatite and zircon, rarely as Rhyolite (Granite) Dacite (Granodiorite) Andesite (Diorite) |  | | Report (volume) | | the Malani Igneous Suite and Tertiary Alkaline Province of western Rajasthan Dr. S.K. Shushan • Dr...mafic and felsic dykes. The terrestrial basalt-rhyolite/trachyte volcanism of Malani is characterised...and textures. The younger magmatic event of the province in Rajasthan is represented by hyperalkaline (Tertiary)................................ GEOLOGY OF THE PROVINCE Granites . . . ....... ...................... .................... Alkaline rocks of the province Carbonatites ......................... . . |  | | Report (volume) | | Thor H. Kiilsgaard and Earl H. Bennett. 153 (N) Rhyolite Intrusions and Associated Mineral Deposits in...breccias, and reworked tuffaceous sediments. Mostly rhyolite and rhyodacite OLDER PYROCLASTIC ROCKS AND SEDIMENTS...orthopyroxene, and less common olivine and quartz RHYOLITE INTRUSIVE BODIES Dikes, plugs, domes, and stocks...Tuffs, lavas. and volcanic sedimentary rocks of rhyolite, rhyodacite, dacite, and andesite CRETACEOUS INTRUSIVE...Tuffs. Isvas. snd volcanic sedimentsry rocks of rhyolite, rhyodscite, dacite, and sndesite CRETACEOUS INTRUSIVE |  | | Book (edition) | | to three inches long occur in biotite schist. A dome cut on the c-axis shows pink/lavender chatoyancy...facet-grade topaz has been found. Several Tertiary rhyolite occurrences have topaz similar to Thomas Range...Miami, in Gila County; the Pinto ValleyMine (Castle Dome), in Gila County; the Mineral FIGUIE 1.11...,~J:·:::...Proterozoic quartz-mica schist with an associated rhyolite dike in the 76 to 70 Ma (million years old) Bagdad...Lead and zinc ore deposits are associated with rhyolite dikes that have been dated at circa 22 Ma (Wrucke |  | | Book (volume) | | towns, counties, and districts in each state and province arranged alphabetically; with an appendix, containing...veins which must weigh at least several tons." ANNITE (Mica Group) - see extended discussion of annite's...prismatic zircon crystals (to 2 mm) and 2-5 mm annite-phlogopite grains are also frozen in the syenite...can be associated. B!OT!TE SERIES (Mica Group) - annite and phlogopite end-members Albany - Bumpus Q, Donahue...of the black micas from Cape Ann, Massachusetts. Annite was ferrous iron-dominant, but still ferric iron-bearing |  | | Book | | describes the Hoggar gold and rare metals metallogenic province of the Pan-African Tuareg Shield in Algeria, proposing...mineralization in the Hercynian central Jebilet-Guemassa province of Morocco. MVT and Sedex deposits are represented... The Hoggar Gold and Rare Metals Metallogenic Province of the Pan-African Tuareg Shield (Central Sahara...Mineralization in the Central Jebilet-Guemassa Province (Western Moroccan Hercynides). . . . . . . . ...tectono-stratigraphic domains are recognized (1) the Precambrian province that includes the African-Nubian Shield (ANS) |  | | Journal (volume) | | (Romania) (Slovakia) (China) (Germany) (Poland) (Italy) (Czech Republic) (Romania/USA) (Germany) (Hungary)...Terra, Università di Pavia, Italy (*michele.zema@unipv.it) 2 CNR-IGG, Pavia, Italy 3 Bayerisches Geoinstitut...5 1 Dept. of Chemistry, University of Florence, Italy (*dibenefr@geo.unifi.it) 2 Inst. for Materials Science...University of Florence, Italy 4 Inst. for Physico-Chemical Processes, CNR, Italy 5 Inst. of Geological... Università di Modena e Reggio Emilia, Modena, Italy (*dmalf@unimore.it) The aim of this work is to prepare |  | | Book | | Pirajno commenced his academic studies in his native Italy where he obtained a Doctorate in Geological Sciences.... . . . . . . . . . . . . . . . 4.4.1 Scheelite Dome, an Intrusion-Related Au Deposit, Yukon, Canada...Deposit, Abitibi-Wawa Greenstone Belt, Superior Province, Canada . . . . . . . . . . . . . . . . . . .... . . . 992 9.7.2 Central Australian Heat Flow Province . . . . . . . . . . . . . 995 9.8 An Unusual Amagmatic...deposits are abundant in the Latium region, central Italy, from where the name originated (Lapis tiburtina) |  | | Report (issue) | | Siberian flood basalt province in Russia, which is the largest flood basalt province in the world.........complexes that are part of the Nikolai large igneous province.................................................Drainage Technology Initiative AFRG alkali-feldspar rhyolite-granite AIDS acquired immunodeficiency syndrome...Acid Rock Drainage GWh gigawatt-hour HDC Hicks Dome Corp. HFSE high-field-strength element HIV human...lithium-cesium-tantalum light-emitting diode large igneous province lowest observable effect limit log of oxygen fugacity |  | | Book | | assemblages, and those in more felsic basalt-andesite-rhyolite assemblages. Copper is the chief ore element in...examples, where basalt-andesite-rhyo¬ lite or basalt-rhyolite cycles can be well defined (Spence and de Rosen-Spence...be virtually complete; even the quartz of the rhyolite tuffs is replaced in ex¬ treme cases. Iron-magnesium...bimodal ba¬ salt-rhyolite, or ranging from basalt, through ande¬ site, to rhyolite, and the base metal...above the copper-zinc orebody at Prieska, Cape Province, in an intermediate to salic volcanic as¬ semblage |  | | Book | | flow, are characteristic of a given geological province. For example, its value in the eastern United...United States is 33 mW m~?, in the Basin and Range Province it is 59 mW m ?, and in both the Baltic and Canadian... The surface heat flow in the Basin and Range province of the western United States is unusually high—87...significant lowering of melting temperatures. Basalt and rhyolite can both have their beginning of melting temperatures...which is a more normal magmatic temperature for rhyolite. By comparison, ASE 30 motor oil has a viscosity |  | | Book | | epochs. Following Tumeaure (1955), a metallogenic province may be defined as a mineralized area or region...The size of a metallogenic province can be as large as the Superior Province (Canadian Shield) or as small...as the Upper Michigan Peninsula native copper province. Similarly, a metallogenic epoch can be as broad...kimberlite fields in the southern African kimberlite province (after Mitchell 1986). Figure 26 CHAPTER 2...Metalliferous black shaie Zunyi (Guizhou Province) and Dayong (Hunan Province), China Manganese nodules Sea-floor |  | | Book (edition) | | statue is in the Galleria dell’Accademia, Florence, Italy. 83 Figure 2.17 Spider rock, in Canyon de Chelly...from Carrara, ∼100 km west-northwest of Florence, Italy. This is where Michelangelo spent considerable time...the general picture is that at about 1250°C the dome is closed. This means that above this temperature...7.10. Figure 7.10 Close-up of a small vug in rhyolite with colorless to white, transparent sanidine...extrusive rocks such 399 as granite, granodiorite, rhyolite, and granitic pegmatites. It is also a common |  | | Report (issue) | | cratonic forelands (Wopmay or¬ ogen; Churchill Province-Slave Craton, Gibb, 1975; deeplevel shear zones...chemically similar to modern equivalents (Churchill Province, Great Batholith in Wopmay orogen, Arizona, Svecokarelides...Superior-Churchill Province boundary and in several positions within the Churchill Province. The Thelon and...density and that the gravity model of the Churchill Province east of the trough is comparable in morphology...interpret the geo¬ logical features along these province boundaries. Paleomagnetic Data There is considerable |  | | Book (edition) | | statue is in the Galleria dell’Accademia, Florence, Italy. Figure 2.17 Spider rock, in Canyon de Chelly...from Carrara, ~100 km west-northwest of Florence, Italy. This is where Michelangelo spent considerable time...the general picture is that at about 1250°C the dome is closed. This means that above this temperature...7.10. Figure 7.10 Close-up of a small vug in rhyolite with colorless to white, transparent sanidine...extrusive rocks such as granite, granodiorite, rhyolite, and granitic pegmatites. It is also a common |  | | Book (edition) | | of a long-vanished sea that once extended over Italy; and that it could not have been the Noachian Deluge...for example in the southern Alps and Calabria in Italy and in Fjordland in New Zealand, sections of the...The usual residues are extremely minute is called annite. The expression (OH,F) means that flakes consisting...(silica-rich) igneous rocks are, respectively, obsid¬ ian, rhyolite, microgranite and granite (Plates He, Hid). The...albite (feldspars) and quartz and form a granite or rhyolite depending upon whether it crystallizes slowly |
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