 | | 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...(anorthoclase) & plagioclase (oligoclase) + Fe-Ti oxide apatite results in peralkaline rhyolite. Rarer subalkaline...trachyte)/rhyolite bimodality reflects rapid crystallization of basalt magma to trachyte (and rhyolite) over |  | | 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; |  | 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) | | 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...Table 1. III. DYKE ROCKS Ring-dykes and related radial or transverse dykes are grouped together under this |  | | Journal (article/letter/editorial) | | discontinuous and consists of flow layered and autoclastic rhyolite. The upper unit consists of andesitic to rhyolitic...surrounding siltstones are intruded by porphyritic rhyolite dykes, most of which trend ESE and lie southwest...Kent's Knob (Fig. 2). They are localized where the rhyolite dyke swarm intersects a narrow NE-trending structural...local wall rocks (i.e. siltstone, metadolerite and rhyolite porphyry). The are clast-supported and although...-I- 4- 4- 4- ~- + + -t- 4- -I" 4- + t 4- -I- ~ Rhyolite flows \, -f + + 4- + -I" 4- 4- 4- 4- 4- -t- + |  | Waight, T.E., Weaver, S.D., Maas, R., Eby, G.N. (1998) French Creek Granite and Hohonu Dyke Swarm, South Island, New Zealand: Late Cretaceous alkaline magmatism and the opening of the Tasman Sea*. Australian Journal of Earth Sciences, 45 (6) 823-835 doi:10.1080/08120099808728438 | Journal (article/letter/editorial) | | feldspar syenite. Spatially associated rhyolitic dykes are considered to represent hypabyssal equivalents...varieties dominate the swarm, with rare phonolite dykes also present. Geochemical compositions of French...and Greenland Group are cut by a swarm of mafic dykes called the Hohonu Dyke Swarm (Waight 1994). Concentrations...much of the Hohonu Ranges, blue to cream-grey rhyolite dykes (up to 15 m wide) intrude the Deutgam Granodiorite...Granodiorite. Chemical similarities suggest these dykes represent hypabyssal equivalents of French Creek |  | | Report (chapter) | | are cross-cut by doleritic and peralkaline rhyolite dykes, which both show chilled margins against the...mylonitized doleritic and peralkaline rhyolitic dykes (Fig. 5c,d,f) with a well preserved H P / L T fabric...mylonitized granitoids (Fig. 5c,d,e) and rhyolitic dykes show the typical features of quartz-feldspathic...sequence (quartz diorite/tonalites), basalt doleritic dykes and granitoids are characterized by epidoteblueschist...apfu) and albite (Table 1). The peralkaline rhyolite dykes show an unusual metamorphic paragenesis, defined |  | | Journal (article/letter/editorial) | | granite varieties. Quartz-porphyry dykes and spherulitic rhyolite dykes are found in association with the...microcline perthite and the plagioclase is zoned oligoclase. Myrmekitic rims are common between plagioclase...(Fig. 2). A number of quartz porphyry and aplite dykes (not marked on the map) intersect the major granites...Ikldlum-~rlllmld gr~lnite, Ir~ places micrograph*¢ [ ~ ] Rhyolite dyke, Grmnutite % % Fig. 7. Generalized geological...granite banded spherulitic rhyolite dykes occur in the granulites. These dykes show no sign of regional |  | | Journal (article/letter/editorial) | | [ 171-177 [ Stuttgart 1991 Geochronology of a rhyolite dyke from Nassarawa-Egon in Central Nigeria By...der Mittelkreide stammen. Abstract A 50-m thick rhyolite dyke which cuts the PanAfrican crystalline basement...This paper is concerned with a previously unknown rhyolite dyke which intruded into a shear zone developed...(1984). Several alkaline rhyolite dykes surround the Mada complex. These Mada dykes are thin (1 m to 3 m)...135 Ma old rhyolite intruding the basement at Burashika (BURKE, 1976); another are the rhyolite flows of |  | | 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 |  | | Journal (article/letter/editorial) | | Mesozoic granitoid batholiths, stocks and granitoids dykes are common throughout Alkaline igneous rocks the...metamorphic rocks Pz alkaline cryptoexplosive breccia dykes in Pt metamorphic rocks Same as that of Jiaojia...(Ar) Quartz monzonite stocks (116-132 Ma) & rhyolite dykes (122±1 Ma) Same as that of Yuerya (3) Anjiayingzi...chambers native Au & ele Diabase, aplite & granite dykes or stocks (Mz) EW-trending qtz veins, Py, gn, mag...intrusive NW-trending alteration Py, cpy, gn, sp, bmt, dykes (Pz & Mz) zones & chambers bn, mo & mag gabbro |  | | 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) | | 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) | | previous work rhyolite, andesite and dolerite, as well as composite andesite-rhyolite dykes (Shpitzer et...rocks contain biotite. The hypabyssal rocks include dykes of types. The granitoids in the complex have different...Doleritedyke Compositedyke ..\ \ ..... T / ..... Rhyolite dyke 910 4 + Andesite dyke I- Quartz monzodiorite...AlzO3/(KzO+Na20) ratios are related to plagioclase (oligoclase) and high K20/(K20+Na20) ratios are related to...bigger scale in the Elat area. The potassium-rich rhyolite dyke in the Nahal Shlomo area (Vapnik, 1996) may |  | | Journal (article/letter/editorial) | | basaltic (Přichystal 1999), and Variscan lamprophyric dykes (Šmejkal 1964), were mapped in this belt. 4.1.1...volcanic rocks form concordant layers, or discordant dykes, in the metabasalts. Their thickness ranges from...detail for this reason only. The first one, a rhyolite layer within the basalts with a MORB-like signature...Tab. 1), reflecting the magmatic stage. Albite/oligoclase rims surrounding the relicts of magmatic plagioclase...metabasalts were completely replaced by albite/oligoclase. Magmatic pyroxenes were transformed to actinolites |  | | Journal (article/letter/editorial) | | comprising the youngest and highestlevel phases of the Saint George Batholith, has a Late Devonian age (367 Ma)...Cl – Carrow Formation basalt, BRl – Bailey Rock Rhyolite; Intracaldera rocks: SMl1, SMl2, SMl3 – Scoullar...caldera-fill rocks: BSMl – Big Scott Mountain Formation rhyolite, BSMt1, BSMt2 – Big Scott Mountain Formation lower...Oromocto Andesite, Carrow Formation and Bailey Rock Rhyolite, in ascending stratigraphic order. The first and...intruded by, the Bailey Rock Rhyolite (Fig. 3, cols 7, 8). The Bailey Rock Rhyolite, Bailey Rock Formation |  | | 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...anhydrous and include phenocrysts of plagioclase (oligoclase-andesine), Kfeldspar, orthopyroxene (pigeonite |  | | Journal (article/letter/editorial) | | 1 and 2). The paragneiss (quartz, K-feldspar, oligoclase, biotite, white mica, garnet, sillimanite ± apatite...similar mineral composition (quartz, K-feldspar, oligoclase, biotite, sillimanite/fibrolite ± garnet, zircon...consisting of coarse-grained quartz, K-feldspar and oligoclase, and accessory biotite, muscovite, garnet, sillimanite...basement lithologies were intruded by NNE-trending rhyolite dykes. An autochthonous transgression sequence (conglomerates |  | | Journal (article/letter/editorial) | | Batholith 600 Fiery. Creek Volcanics Carters Bore Rhyolite 150 8 Weberra Granite 20 Sybella Batholith...overlain unconformably by the 1680 Ma Carters Bore Rhyolite and sediments of the McNamara Group of cover sequence...north of Mount Isa (Fig. 1). Several rhyolite and trachyte dykes emanating from it appear to be comagmatic...from crystallization ages in the Carters Bore Rhyolite ( 1678 _+3 Ma, Page (1978)) of the rift phase...Fiery Creek Volcanics, the Carters Bore Rhyolite, and dykes associated with the granite (Bultitude and |  | | Journal (article/letter/editorial) | | 206 Pb/238 U zircon age of 300.7 ± 2.4 Ma from a rhyolite porphyry dyke (with disseminated base metal sulfide...generations of vein type rocks (granitoid apophyses and dykes, as well as aplites, pegmatites and quartz-feldspar...granitoids are cut by numerous lamprophyre and other dykes. One of them, the micromonzodiorite dyke from the...porphyritic and hybrid granitoids, and composite dykes, gave ages in the range ca. 314–311 Ma [39,40],...body of the pluton, smaller granitoid, aplite or rhyolite veins were injected. During the D3 deformation |  | | Report (issue) | | also great intrusions of granite rose, and igneous dykes were injected in vast numbers, more especially in...representative rock-types. Jn Tertiary times several dykes were injected along cracks having a general north-westerly...areas of Glen Coe and Ben Nevis, surrounded by ring-dykes, form another feature of unusual interest in the...l'vlon,:onite, Kentallenite, Cortlandtite XVI. DYKES AND SHEETS Early Lamprophyre Sheets . . Lamprophyres...Etive Swarm of North-East Dykes . . Ben Nevis Swarm of North-East Dykes Dykes North-\Vest of Loch Linnhe |  | Tuduri, Johann, Chauvet, Alain, Barbanson, Luc, Bourdier, Jean-Louis, Labriki, Mohamed, Ennaciri, Aomar, Badra, Lakhlifi, Dubois, Michel, Ennaciri-Leloix, Christelle, Sizaret, Stanislas, Maacha, Lhou (2018) The Jbel Saghro Au(–Ag, Cu) and Ag–Hg Metallogenetic Province: Product of a Long-Lived Ediacaran Tectono-Magmatic Evolution in the Moroccan Anti-Atlas. Minerals, 8 (12). 592pp. doi:10.3390/min8120592 | Journal (article/letter/editorial) | | large igneous provinces (SLIPs) [12,14]. Dacite–rhyolite pyroclastic rocks (ignimbrites), along with transitional...the Lower Complex [29,30,47,112,131–133]. Related dykes and plutons intrude both the rocks of the Lower... to the North (Figures 5 and 6b). Numerous rhyolite dykes, 10 to 20 meters wide are located along this...this lineament (Figures 5 and 6a,b). Dykes are vertical or near-vertical and intrude the Lower Complex...rocks of the Upper Complex. Because these rhyolitic dykes are emplaced along the proposed structural limit |  | | 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 |  | | 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 |  | | Journal (article/letter/editorial) | | pyroclastic rocks 8. Pink microgranite 9. Bouskour rhyolite dykes, (C) Ougnat geological map. 1. Lower Neoproterozoic...pattern is of dark grey and contains zoned andesine-oligoclase (49?40), green hornblende (19%), biotite (8%)... The quartz diorite outcrops as NW-SE oriented dykes which cross cut the lower Neoproterozoic volcanoclastic...porphyritic texture with K-feldspar (26%) and oligoclase (36%) phenocrysts. Biotite (7%) is generally |
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