 | | Journal (article/letter/editorial) | | flow, rhyolitic dykes, a trachyandesitic lava flow and basaltic trachyandesitic dykes. Existence of mafic...magmas of rhyolite lava and dykes, and trachyandesite lava and basaltic trachyandesite dykes were derived...trachyandesitic lava flows and basaltic trachyandesitic dykes. Oxide phases in all rocks are magnetite and ilmenite...intermediate-mafic mixing. The rhyolitic lava flow and dykes evolved in relatively shallower crustal magma chambers...2007 KEY WORDS mixing; mingling; Turkey; Malatya; rhyolite; trachyandesite; mineralogical disequilibrium; |  | | Journal (article/letter/editorial) | | intermediate and mafic pyroclastics, lavas, and dykes occupy a NW-trending zone through the Whitsunday...rare basalt flows. The sequence is cut by abundant dykes, especially in the northern region and adjacent...ranging from dolerite through andesite, dacite and rhyolite. Dyke orientations show maxima between NW-NNE...ranges continuously from basalt to high-silica rhyolite, with calc-alkali to high-K affinities, and geochemical...were defined as the thick (> 1000 m) sequence of rhyolite flows and minor pyroclastics and andesite overlying |  | | Journal (article/letter/editorial) | | ring-dykes intrusive into upturned sandstones, and cross-cutting non-arcuate dykes of rhyolite, comendite...injected by numerous narrow steeply-dipping ring-dykes. Later dykes and breccia necks have pierced the complex...complex and country rocks. Outside the zone of ring-dykes the surface rocks belong to the Jurassic Walloon...masses of Mt. Greville (comendite), Mt. Moon (rhyolite) and Minto Crags (a ring-dyke of comendite), respectively... In the analysed rock (542, 1 Tables 1 and 4) andesine is by far the 1 Three-figure numbers refer to |  | Cucciniello, Ciro, Sheth, Hetu, Duraiswami, Raymond A., Wegner, Wencke, Koeberl, Christian, Das, Tarulata, Ghule, Vivek (2020) The Southeastern Saurashtra dyke swarm, Deccan Traps: Magmatic evolution of a tholeiitic basalt–basaltic andesite–andesite–rhyolite suite. Lithos, 376. 105759pp. doi:10.1016/j.lithos.2020.105759 | Journal (article/letter/editorial) | | a tholeiitic basalt–basaltic andesite–andesite–rhyolite suite Ciro Cucciniello a,⁎, Hetu Sheth b, Raymond...widespread occurrence of mafic enclaves in the rhyolite dykes suggests that processes such as magma mixing...the Western Ghats, with more randomly oriented dykes than the 2 C. Cucciniello et al. / Lithos 376–377...features and localities mentioned in the text. Dykes of the Eastern, Central, and Southeastern Saurashtra...Geochemical (including Sr-Nd-Pb isotopic) data on dykes of the three swarms (Vanderkluysen et al., 2011 |  | | Journal (article/letter/editorial) | | Geology and Mineralogy, University of Queensland, St. Lucia, Queensland, 4o67 SUMMARY. Spherulitic devitrification...studied from a suite of samples from the Aratiatia rhyolite. The most significant effect is the progressive...glasses. A systematic study of one rhyolite extrusion, the Aratiatia rhyolite, was undertaken to study in detail...T a u p o rhyolites are typically plagioclase (andesine), quartz, bypersthene, magnetite, ilmenite, less...accompanying spherulitic crystallization The Aratiatia Rhyolite has been described by Thompson (1966); it consists |  | | Journal (article/letter/editorial) | | associated with a swarm of dykes of doleriteibasalt, minor trachyte and rhyolite composition. The dolerites...peralkaline trachyte and subalkalineiperalkaline rhyolite with alkali feldspar and quartz f alkali amphibole...and trace element geochemistry indicate that the dykes may be regarded as a cogenetic dolerite-peralkaline...(oligoclase) + Fe-Ti oxide apatite results in peralkaline rhyolite. Rarer subalkaline rhyolites result from fractionation...trachyte)/rhyolite bimodality reflects rapid crystallization of basalt magma to trachyte (and rhyolite) over |  | | Report (issue) | | Amygdaloidal lava, Magna Lynn Metabasalt . Flow-banded rhyolite lava, Argylla Formation . Cross-bedded sandstone...in age from pre-1860 Ma to about 1100 Ma, form dykes, sills, and pod-like bodies, and also net- veined...mafic dykes were intruded at various times prior to 1620 Ma. There are also some younger mafic dykes which...Member of the Mount Guide Quartzite (Table 8), Saint Ronans Metamorphics, Kallala Quartzite, and Sulieman...by Sybella Granite, metadolerite, and dolerite Saint Ronans Metamorphics Mica schist, quartzofeldspathic |  | Katzir, Y., Litvinovsky, B.A., Jahn, B.M., Eyal, M., Zanvilevich, A.N., Valley, J.W., Vapnik, Ye., Beeri, Y., Spicuzza, M.J. (2007) Interrelations between coeval mafic and A-type silicic magmas from composite dykes in a bimodal suite of southern Israel, northernmost Arabian–Nubian Shield: Geochemical and isotope constraints. Lithos, 97 (3) 336-364 doi:10.1016/j.lithos.2007.01.004 | Journal (article/letter/editorial) | | mafic and A-type silicic magmas from composite dykes in a bimodal suite of southern Israel, northernmost...alkaline quartz porphyry dykes, rare mafic dykes, and numerous composite dykes with felsic interiors and...chemically corresponds to A-type granite. Composite dykes with either abrupt or gradational contacts between...at depth and continued during emplacement of the dykes. Oxygen isotope ratios of alkali feldspar in quartz...reveal significant crustal contribution to the rhyolite magma, suggesting that mafic and A-type silicic |  | | Journal (article/letter/editorial) | | bedding planes and the northern orientation of dykes within the SRVC are consistent with dextral northwest...resistant lapilli tuffs and recessive weathering rhyolite and dacite flows. The bottom 40 m of the unit...by a 150-m sequence dominated by 3 to 5-m-thick rhyolite flows, with thin interbeds of green-weathering...observed in other shallow rhyolitic stocks and ring dykes associated with the Sloko-Skukum volcanism in the...and irregular, or concealed by volcanic talus. Dykes and sills are widespread throughout the SRVC, and |  | | Journal (article/letter/editorial) | | Vermilion, and Kirkwood quartz diorite offset dykes, the former being associated with one of the largest...radial and concentric dykes of quartz diorite (Fig. I), referred to as "offset dykes" due to their 505...Frood - Stobie Mine Huronian Supergroup Offset dykes: (metasedimentary rocks) . ...... .. Sublayer...(7), Frood-Stobie (8), and Vermilion (1 1) Offset Dykes. Area in dotted rectangle is enlarged in Fig. 2...1903. 1905; Cochrane, 1984). There are 12 offset dykes known, and they occur in fracture/fault systems |  | | Journal (article/letter/editorial) | | 454 1967). The magmatics are represented by dykes, very shallow intrusions, and rare associated volcanic...groundmass becomes hypocrystalline. The phenocrysts are andesine (35±50%, or mostly 39± 42% an), hornblende, and...granodiorite to granite-porphyry and andesite-dacite-rhyolite dykes about 54 Ma ago (Late Paleocene). The fourth...volcaniclastic rocks, with subordinate lavas and feeder dykes. The intrusive and dyke rocks are monzonites, diorites |  | Gonevchuk, V. G., Gonevchuk, G. A., Korostelev, P. G., Semenyak, B. I., Seltmann, R. (2010) Tin deposits of the Sikhote–Alin and adjacent areas (Russian Far East) and their magmatic association. Australian Journal of Earth Sciences, 57 (6) 777-802 doi:10.1080/08120099.2010.503993 | Journal (article/letter/editorial) | | the Early–Late Cretaceous (105–90 Ma) Badzhal rhyolite–granite complex; and (iv) the Late Cretaceous...the marginal parts of the intrusive body and in dykes. Biotite granites of the second phase are fine-...larger part of the intrusive body, and are cut by dykes and small stocks of fine-grained leucocratic granites...are *6 m thick. The granite body is surrounded by dykes of pre-granite ongonitic rhyolites and a stock...volcano–plutonic association consisting of rhyolites and rhyolite tuffs of the Kholdama complex (125–90 Ma; ISr |  | | Journal (article/letter/editorial) | | Silicic large igneous province Melt inclusion Rhyolite Fluorine Australia Mesoproterozoic a b s t r...comparable with flood basalts (e.g. Star Mountain Rhyolite, Trans-Pecos, Henry et al., 1988; Yardea Dacite...volcanic centres. Evenly porphyritic dacite and rhyolite are interbedded with ignimbrites and volumetrically...compositionally homogeneous felsic (dacite and rhyolite) massive lavas (Allen and McPhie, 2002; Allen...include phenocrysts of plagioclase (oligoclase-andesine), Kfeldspar, orthopyroxene (pigeonite Mg#24–43 |  | | Journal (article/letter/editorial) | | pyroclastic rocks 8. Pink microgranite 9. Bouskour rhyolite dykes, (C) Ougnat geological map. 1. Lower Neoproterozoic...are euhedral and zoned from labradorite cores to andesine rims. Subhedral biotite occurs only in small quantities...rock pattern is of dark grey and contains zoned andesine-oligoclase (49?40), green hornblende (19%), biotite... The quartz diorite outcrops as NW-SE oriented dykes which cross cut the lower Neoproterozoic volcanoclastic |  | Thomas, R.J, Chevallier, L.P, Gresse, P.G, Harmer, R.E, Eglington, B.M, Armstrong, R.A, de Beer, C.H, Martini, J.E.J, de Kock, G.S, Macey, P.H, Ingram, B.A (2002) Precambrian evolution of the Sirwa Window, Anti-Atlas Orogen, Morocco. Precambrian Research, 118 (1) 1-57 doi:10.1016/s0301-9268(02)00075-x | Journal (article/letter/editorial) | | and lavas (minor basalt, andesite and voluminous rhyolite). The volcanic component of this extensive succession...porphry bodies, along with rhyolitic plugs, domes and dykes. Postorogenic magmatism terminated with the emplacement...various minor intrusive rhyolitic necks, plugs and dykes Achkoukchi Complex Bouljama Tafrant Tiouin Aghbar...unfoliated-tourmaline pegmatite, forming sheets, dykes and irregular masses on all scales, some of which...representing metamorphosed gabbro plutons, dolerite dykes and basaltic lava. The ophiolite contains small |  | | Report (issue) | | Andesite Formation 14 St John's Rhyolite Formation 23 Bouley Rhyolite Formation 28 Rozel Conglomerate...30 1 2 Vertical section through the Anne Port Rhyolite exposed on the north side of Anne Port beach 35...exposed at Le Nez Point 47 15 Sketch map showing dykes exposed in reefs at Jeffrey' s Leap 62 16 Sketch...around Green Island, showing the displacement of dykes by faults 65 18 Sketch map showing the main structural...34 5 6 7 Columnar jointing in the Anne Port Rhyolite at Anne Port 36 Rozel Conglomerate below La Tete |  | Kováříková, Pavla, Siebel, Wolfgang, Jelínek, Emil, Štemprok, Miroslav, Kachlík, Václav, Holub, František V., Blecha, Vratislav (2007) Petrology, geochemistry and zircon age for redwitzite at Abertamy, NW Bohemian Massif (Czech Republic): tracing the mantle component in Late Variscan intrusions. Geochemistry, 67 (2) 151-174 doi:10.1016/j.chemer.2007.04.002 | Journal (article/letter/editorial) | | between the main granite intrusion and anorogenic rhyolite dykes, which intruded breccia bodies of tin-hosting...and two-mica gneisses and intersected by abundant dykes of granite porphyries. The south-eastern part of...crystals range from calcic oligoclase to medium andesine. Pyroxenes occur as turbid relicts of diopsidic...correspond to acid labradorite and, very rarely, to andesine (near the contact with quartz). Plagioclase from...granite and the crosscutting granite porphyry (rhyolite) are almost identical. 8.3. Harker diagrams Fig |  | | Book (volume) | | associated in some places with syn-tectonic igneous dykes in areas where deviatoric stress or lithostatic...syn-tectonic dykes (basalt- and en echelon strike-slip faults which are interandesite-rhyolite) and small...AL-SHANTI intruded by swarms of syn- and post-tectonic dykes ranging in composition from rhyolites to basalts...provide receptive loci for magma intrusion forming dykes and passageways for hydrothermal fluids. Where major...secondary fault planes and in the sheared contacts of dykes. The large number of quartz veins in some mineralized |  | Weissheimer de Borba, André, Fernandes de Lima, Evandro, Lidia Medeiros Vignol-Lelarge, Maria, Maria Pimentel Mizusaki, Ana, Sparrenberg, Irena, Ennes de Barros, Carla (2003) Significance of Late Paleozoic Fission-track Ages in Volcanic Rocks from the Lavras Do Sul Region, Southernmost Brazil. Gondwana Research, 6 (1) 79-88 doi:10.1016/s1342-937x(05)70645-6 | Journal (article/letter/editorial) | | the sequence, showing flow-oriented labradorite-andesine phenocrysts, and associated augite, olivine, Ti-magnetite...and spessartiticlamprophyres, with associated rhyolite dykes. (Nardi, 1984; Lima and Nardi, 1998). Methodology |  | | Journal (article/letter/editorial) | | The Hviddal Giant Dyke The Olivine Gabbro Giant-Dykes. . . . . . . . . . . . . . . . . . . . . . . . ...Microsyenite Dykes associated with the Central Complex . . . . . . . . . . . . . . . . .. Later Dykes and Sills...intrusions take the form of ENE.-WSW. trending dykes running parallel to one of the major faulting directions...directions. Tugtutoq lies along a belt in which these dykes are especially concentrated and provides a rewarding...field for their investigation. One of the earliest dykes, some 500 m broad, is composite and consists of |  | Fortey, N. J., Cooper, A. H., Henney, P. J., Colman, T., Nancarrow, P. H. A. (1994) Appinitic intrusions in the English Lake District. Mineralogy and Petrology, 51 (2) 355-375 doi:10.1007/bf01159737 | Journal (article/letter/editorial) | | suite of tholeiitic and calc-alkaline basaltic dykes which span emplacement of the Eskdale Granite, and...and widely distributed calc-alkaline lamprophyre dykes (MacDonald et al., 1985) probably belong to 358...magma-chamber of the Eycott Volcanic Group, and basalt dykes in its proximity are also structurally and compositionally...It is accompanied in the dioritic groundmass by andesine, biotite, apatite and Fe-Ti oxide grains, together...of this occur a small number of strongly altered dykes of basalt or andesite. Intrusions in the area east | | | Report (issue) | | Saviour’s Andesite Formation 14 St John’s Rhyolite Formation Bouley Rhyolite Formation 28 10 Economic geology...10 1104 Vertical section through the Anne Port Rhyolite exposed on the north side of Anne Port beach 35...showing dykes exposed in reefs at Jeffrey’s Leap 62 ‘ 6 Columnar jointing in the Anne Port Rhyolite at...around Green Island, showing the displacement of dykes by faults 65 18 Sketch map showing the main structural...Conglomerate Formation Fliquet Bouley Rhyolite Formation St John’s Rhyolite Formation St Catherine's L’‘Homme |  | | Report (chapter) | | (i) Volcanic structures (ii) Cone-sheets and ring-dykes (iii) The granite intrusions . (c) The (i) (ii)...ring-structure and the great granite-porphyry ring-dykes surrounding the Rop and Sha complexes. Greenwood...ring-structure and the great granite-porphyry ring-dykes surrounding the Rop and Sha complexes. Greenwood... 9 92 70 ---25 13 3 4 25 11 1 2 5 9 5 2 5 Rhyolite Basic and intermediate rocks 2 2 1 29 -- ...also occur as high-level intrusions in the form of dykes, irregular sheets, diatremes and shallow subsurface |  | | Report (volume) | | flows while granites occurring as plutons, ring dykes, bosses and plugs form the second phase. The third...represented by mafic and felsic dykes. The terrestrial basalt-rhyolite/trachyte volcanism of Malani is.................... . Granitoids and gneisses .Dykes . .............................................................................. Peralkaline rhyolite . . ........................................................................ Peraluminous rhyolite . ............. ........ . ............. |  | | Journal (article/letter/editorial) | | anorthosites; while trachydoleritic hosts contain smaller andesine megacrysts. The xenoliths and megacrysts are regarded..... b) Age relationships between the felspathic dykes and other Gardar intrusions " c) Types of inc1usion...localities " 14 14 III. Pre-Gardar felspathic dykes 15 20 33 " 66 D. BRIDGWATER...................and mineralogy of felspathic inc1usions in Gardar dykes . . . . . a) Petrology............................associated with the felspathic inc1usions in Gardar dykes. 68 68 PART TWO. 73 V. Mineralogy of the felspars |
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