 | | Journal (article/letter/editorial) |
| southwestern Finland is composed of biotite–hornblende–fayalite granite, biotite granites and late-stage topaz-bearing...granite, as well as related topaz-bearing rhyolite (ongonite) dykes. Miarolitic cavities indicate the presence...pegmatite and 0·0–0·6% in greisen. Some of the rhyolite dykes contain topaz as phenocrysts and as small prismatic...homogeneous, even- and mediumgrained biotite–hornblende(–fayalite) granite called the Tarkki granite. The central...porphyry dykes, some of which are topaz bearing, as well as by intermediate dark porphyry dykes which represent |
 | 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 |
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| and other workers such tholeiitic basalt-dacite-rhyolite series. DE~ENH~U~DT as SIEDNER(1966) and SMITH(1963...zirconium values and few zircons in the alkali-rhyolite dykes, Atsulta Range, British Columbia, lead MATHEWS...Arfvedsonite-fayalite-granite porphyry, E. of R. Baba 3 5169 2 5799 Quartz-pyroxene-fayalite porphyry...and WATSON K. D. (1963) Spherulitic alkali rhyolite dykes in the Atsulta Range, Northern British Columbia |
 | Wang, Yang, Gao, Yongfeng, Santosh, M., Hou, Zengqian, Zhang, Hongrui, Xu, Shengchuan (2020) Permian dyke swarm with bimodal affinity from the Hegenshan ophiolite-arc-accretionary belt, Central Inner Mongolia: Implications on lithospheric extension in a Carboniferous continental arc. Lithos, 356. 105369 doi:10.1016/j.lithos.2020.105369 | Journal (article/letter/editorial) |
| major-trace elements, and Sr-Nd-Pb isotopes. These dykes were emplaced in the volcanic-plutonic complex of...data on the dykes, we recognize two magma types: calc-alkaline dykes and A-type granitic dykes. The calc-alkaline...calc-alkaline dykes include diorite and granodiorite, whereas the A-type granitic dykes are composed of...of granite porphyry and rhyolite, corresponding to a major phase of Early Permian bimodal magmatism in...in the Hegenshan belt. The diorite-granodiorite dykes exhibit a continuous evolutionary trend of calc-alkaline |
 | Mbowou, G. I. B., Lagmet, C., Nomade, S., Ngounouno, I., Déruelle, B., Ohnenstetter, D. (2012) Petrology of the Late Cretaceous peralkaline rhyolites (pantellerite and comendite) from Lake Chad, Central Africa. Journal of GEOsciences, 57 (2) 127-141 | Journal (article/letter/editorial) |
| fluoro-arfvedsonite ± augite–hedenbergite ± aegirine ± fayalite (Fa97–99) and ilmenite, are characterized by a...Lake Chad will be presented and compared to other rhyolite occurrences from the “Cameroon Hot Line”. These...weathered reddish brown rhyolite, which is cut by greenish dark rhyolitic dykes. This volcano of c. 15–20...sedimentary rocks, which is made up of greenish dark rhyolite belonging to the inner core of the small lava...(Carignan et al. 2001). The dating of a peralkaline rhyolite sample from Lake Chad (Hadjer el Hamis, Tab. 1) |
 | | Report (chapter) |
| (i) Volcanic structures (ii) Cone-sheets and ring-dykes (iii) The granite intrusions . (c) The (i) (ii)...Biotite-granites . Riebeckite-granites Amphibole-fayalite-granites . Basic and intermediate rocks. 6 6...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 -- |
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| coral:rises a suite of traehytic and rhyolitic dykes. In each complex a zimilar suite of trachytie and...loss less se.vere; the majority of the trach)~e/rhyolite dyke rocks are mildly peralkalic. The central...aesNarssaq complex since a swarm of ENE trending dykes cut the latter but are truncated by the former....majority ef the ENE dykes. After the initial intrusion of small stocks (or ring-dykes ?) of microsyenite...r e s - O r 5 6 ( w t . ~/o) (Macdonald 1968), fayalite, ferrohedenbergiteaegirine-augite solid solutions |
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| Tertiary porphyritic acid glasses, which form acid dykes, pitchstone margins of acid intrusives and lavas...correspoinding forma tions are various rhyolite lavas and their pyroclastics. Rhyolite lavas are grey or greyish...and/or quartz, or they are completely aphyric. Rhyolite dykes intruding these formations also have the same...same characters. Most of the groundmass of rhyolite are altered and replaced by sericite, quartz and zeolite...rhyodacite to dacite and ferroaugiteperlite into rhyolite by Strec keisen's classification. MINERALOGY |
 | Maino, Matteo, Dallagiovanna, Giorgio, Gaggero, Laura, Seno, Silvio, Tiepolo, Massimo (2012) U-Pb zircon geochronological and petrographic constraints on late to post-collisional Variscan magmatism and metamorphism in the Ligurian Alps, Italy. Geological Journal, 47 (6) 632-652 doi:10.1002/gj.2421 | Journal (article/letter/editorial) |
| orthogneisses derived from K-rich rhyolite protoliths and minor rhyolite dykes. However, on account of subsequent...of zircon from the Barbassiria Orthogneisses and dykes was undertaken to unravel the relationships between...Carboniferous), and constrain the age of a subsequent rhyolite dyke emplacement event to 260.2 3.1 Ma (i.e...Carboniferous period. Emplacement of late-stage rhyolite dykes that cut the Barbassiria Orthogneisses is linked...linked to a diffuse episode of Late Permian rhyolite volcanism that is commonly observed in the Ligurian |
 | | Report (chapter) |
| divided into three groups: A, inland alkaline lavas, dykes and intrusive complexes of nephelinitic parentage;...mildly-alkaline to nephelinitic mafic lavas and dykes mostly in areas that previously experienced tholeiitic...tholeiitic magmatism; C, salic subalkaline to alkaline dykes and intrusive complexes related to group B. All...The basic components are equivalent to alkaline dykes, whereas the salic component is partly derived from...magmat&m in E Greenland systems. Mafic alkaline dykes are abundant. The complex may contain as much as |
 | | 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 |
 | Xie, Lei, Wang, Rucheng, Chen, Jun, Zhu, Jinchu, Zhang, Wenlan, Lu, Jianjun, Zhang, Rongqing (2013) A tin-mineralized topaz rhyolite dike with coeval topaz granite enclaves at Qiguling in the Qitianling tin district, southern China. Lithos, 170. 252-268 doi:10.1016/j.lithos.2013.03.001 | Journal (article/letter/editorial) |
| elsevier.com/locate/lithos A tin-mineralized topaz rhyolite dike with coeval topaz granite enclaves at Qiguling...online 14 March 2013 Keywords: Qiguling topaz rhyolite Dike Topaz granite enclaves Cassiterite Qitianling...Southern China a b s t r a c t The Qiguling topaz rhyolite is present as a dike within the Qitianling biotite...rock-forming minerals. Granite enclaves and their hosted rhyolite have similar major geochemical compositions and...other. Zircon U–Pb dating indicates that the topaz rhyolite (147–150 Ma) and topaz granite enclaves (154 Ma) |
 | | Journal (article/letter/editorial) |
| albite in discrete crystals Liquidus assemblage Fayalite + pyroxenes + iron oxides Late magmatic calcic...alteration by fluids issued from Early Ordovician A-type dykes and sills that are known throughout the Ollo de...et al. 2008). Early Carboniferous A-type basalt–rhyolite–trachyte igneous suites are mostly exposed within...undersaturated syenites and felsic peralkaline (grorudite) dykes. Isotopic data, i.e. εNd(t) varying from 0 to -8...Grampian Terrane, scarce A-type granite massifs and dykes include biotite ± amphibole-bearing subsolvus and |
 | | Book |
| occurrences, usually volcanic fields or swarms of dykes or diatremes. Some of these are indicated on the...complex and Lake Tortue 103 Northwestern Quebec dykes 1 04 Cabonga Reservoir 1 05 Ba katong Reser-voi...syenitic, but in some places dioritic. It is cut by dykes up to 1.5 m thick including peralkaline types. Most...biotite, sphene and opaq ues. The greater number of dykes are perthite phyric syenites usually with some...suite consists of five agglomerate vents, about 75 dykes and sm all plugs, as well as several sills, within |
 | | Report (volume) |
| features of the province is the presence of giant dykes, up to 800 metres wide. These are dominantly basic...magma generated in the wider portions of these dykes migrated upwards and may ultimately have accumulated...Ilimaussaq intrusion, Larsen & Serensen). The giant dykes, therefore, play a crucial role in understanding...trachyte and, with extreme fractionation, alkali rhyolite. The production of peralkaline acid rocks by crystal...features of the province is the presence of giant dykes, up to 800 metres wide. These are dominantly basic |
 | | Book (volume) |
| Iberian 106 t Portugal Lousal Pyrite >5 France Saint-Salvy 500 OOOt Italy Montevecchio Zn Ag Zn Pb...Arverno-Vosgian Au 14t Arverno-Vosgian France Saint Yrieix (Bourneix) Le Chlitelet Portugal Jales ...Armorican Portugal Montesinho Sn France Sn Saint-Renan Associated with Dinantian leucogranites Associated...the Central Iberian and Ossa-Morena zones, and Saint Salvy in the Montagne Noire); veins of stibnite...acid tuffs, coupled with the presence of basic dykes of uncertain age and fluorite veinlets in the base |
 | | Report (issue) |
| intruded by irregular microdiorite to doleritic dykes and stocks. Gold mineralisation occurs predominantly...felsic rocks with prominent Proterozoic dolerite dykes. Banded iron formation units occur only in the northeastern...rocks. Felsic porphyries and Proterozoic dolerite dykes locally crosscut this sequence. The geology of the...common and felsic porphyry and Proterozoic dolerite dykes intrude the sequence. The Basal mafic unit is the...series of antiforms and synforms, crosscut by felsic dykes and truncated to the south by the MMR fault. Mineralisation |
 | | Book |
| GRANITE 3 In partly crystalline varieties of rhyolite, spheroidal forms may originate which are generally...(1953) write: . There are ·all gradations between rhyolite, a rock of magmatic origin, and granite, and one...border zones of granites. Aureoles and Satellitic Dykes of Batlzoliths In the vicinity of granite massifs...long after the batholith crystallized. Moreover, dykes of lamprophyres occur, which are another facies...differentiation; dark rocks rich in mica flakes and amphibole. Dykes of granite porphyry (microgranites, microdiorites) |
| | Book |
| GRANITE 3 In partly crystalline varieties of rhyolite, spheroidal forms may originate which are generally...(1953) write: There are all gradations between rhyolite, a rock of magmatic origin, and granite, and one...border zones of granites. Aureoles and Satellite Dykes of Batholiths In the vicinity of granite massifs...long after the batholith crystallized. Moreover, dykes of lamprophyres occur, which are another facies...tion; dark rocks rich in mica flakes and amphibole. Dykes of granite porphyry (microgranites, microdiorites) |
 | | Book |
| Alaskan zoned intrusions Mafic lavas Sill complexes Dykes Pegmatites MAGMATIC-HYDROTHERMAL – – – – – –...37). An example of hydrolysis is the reaction of fayalite with water at neutral pH: 2FeSiO4 þ 4H2 O $ 2Fe2þ...fugacity is usually calibrated using buffers, such as fayalite-magnetite-quartz (FMQ) or nickel-nickel oxides...QIF (Frost 1981): Fe2 SiO4 $ 2Fe þ SiO2 þ O2 fayalite At higher fO2, Fe is in both ferrous and ferric...and IQF are the upper and lower fO2 limit for fayalite and MH is the upper fO2 limit for magnetite. The |
 | | Book (volume) |
| oxidised, commonly up to two log fQ2 units above the fayalite-magnetite-quartz buffer (FMQ+2; Brandon and Draper...predominantly as dykes in the cooler middle and upper crust (Fig. 3; see review by Richards, 2003a). Dykes are magma-filled...Clemens and Mawer, 1992). Like faults and fractures, dykes propagate in the or(-a2plane perpendicular to c...vertical magma flow ensues. Because of the ability o f dykes to become self-propagating, and due to the progressive...forces maybe sufficient to form self-propagating dykes, suitably oriented pre-existing fractures and faults |
 | | Book |
| FLOOR-DISSEMINATED TYPE \ QUARTZ-SERICITE VEINS \ 1 ASSOCIATED DYKES Fig. 2 . 3 . DISSEMINATED IN LATE DIFFERENTIATES...essentially sheet-like intrusions with feeder dykes. The style of mineralisation is distinctive and... Disseminated cassiterite in small late stage "dykes" of fine grained granite/aplite. Wolframite is occasionally...consists essentially of a volcanic suite (andesite, rhyolite, dacite, basalt) with an associated forechain...Many centres are associated with small intrusives dykes of fine grained granite/aplite. (Fig. 2.4). A second |
 | | Report (issue) |
| elements. At Millenbach it lies within the Amulet ‘“‘rhyolite’’, and consists of variably silicified, partly...anticline (Sharpe, 1968), and overlies the Garon Lake rhyolite, which is up to a distributed, silicified few...m thick. The Garon Lake basalts, beneath this rhyolite, have irregularly 1980). stratiform, and spilitized...elliptical, 300 m by 110 m, cuts andesite and rhyolite, and consists of fragments of these in a matrix...was obtained (Lambert and Henderson, 1980) for rhyolite from the Back River volcanic complex in eastern |
 | | Report (issue) |
| ultrabasic and eclogite mantle nodules in the kimberlite dykes of Wajrakarur on the western margin of the Cuddapah...the B undelkhand platform ( Fig.2). The Majhgawan dykes are also estimated to have source depth s of some...that can dilate along fractures. Large swarms of dykes in the age range of 2300 to 1 600 Ma in the southern...dyke swarms, including kimberlite and lamproite dykes that are emplaced into the Archaean crust of the...through the Proterozoic. In general, the earlier dykes in the swarms are tholeiites derived from a depleted |
 | | Book |
| GRACIANSKY, M. Ecole des Mines, 60, Boulevard Saint-Michel F-75272 Paris Cedex 06, France DESMONS,J...Geologie-Petrologie CNRS, 23 Rue du Docteur P. MICHELON F-42023 Saint Etienne Cedex, France MERCIER,D. Ecole des Mines...Paris, CGGM, Laboratoire de Sedimentologie, 35, rue Saint-Honore F -77305 Fontainebleau Cedex, France MERCOLLI...data by Mercier). Above Section through the Grand Saint Bernard. Be/ow Section through the Belledonne Grand...southern extension and vertical root zone of the Grand Saint Bernard, a gigantic Pen nine-style recumbent fold |
