 | | 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 |
 | | Journal (article/letter/editorial) |
| 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...Formation, and also fragments of the earlier Gardar ENE dykes. The youngest component of the central Tugtut6q |
 | | Journal (article/letter/editorial) |
| lamprophyre, basalt, trachybasalt, phonolite and rhyolite dykes. The relationship of carbonatite magma to the...isotopic (C, 0, Sr and Nd) data for a series of dykes from the Igaliko Nepheline-Syenite Complex which...&I80 ratios show that the isotope evolution of the dykes is consistent with closely related carbonatite and...Greenland carbonatite dykes Complex and as a late plug associated setting as dykes within of the Gardar...basalt through trachyte to phonolite and rhyolite, in addition to dykes of lamprophyre and carbonatite (Emeleus |
 | | 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 |
 | | 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 . ............. ........ . ............. |
 | | Report (Issue volume) |
| ................................91 Dolerite dykes ...................................................................................101 Basic dykes ..............................................................................115 Intrusive dykes and plugs ........................................volcanics and intrusions. Early Palaeozoic mafic dykes in the Kanmantoo Trough have MORBlike geochemistry...southern and northwestern margins; porphyritic rhyolite broadly equivalent to Gawler Range Volcanics and |
 | | 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 |
 | | Report (issue) |
| a constituent of partly - spherulitic rh yolite dykes that are associated with the Glundebery balholith...quartz form the core zones of the Moose pegma tite dykes located immediate l y north of Hearne Ch anne l...H/11 Analcime and natrolite have been found in dykes cutting Trenton limestone near Montreal, Hochelaga...21 G/l Azurite is found on Frenchman Creek in Saint John County (W. L. Goodwin, 1 938 : Geology and...). -63- AZU 21 H/4 At Beveridge County in Saint John County, in a shear zone {F.J . Alcock , 1938: |
 | | Book |
| Alaskan zoned intrusions Mafic lavas Sill complexes Dykes Pegmatites MAGMATIC-HYDROTHERMAL – – – – – –...the solutions. Volcanic piles with predominant rhyolite-dacite components will produce Pb-rich ores because...hand will cause plagioclase and hornblende-bearing dykes to emanate from the central and still molten part...ite-pyrite) are formed in basalts, sandstone, rhyolite and andesite. Other workers, however, emphasised...made by Prins (1981). One, that the ‘‘trachytic’’ dykes may, on the basis of their low Si and high Na, represent |
 | | Book |
| Phase 3 folds offset early Cretaceous lam¬ prophyre dykes. Geology of Hanging Wall Rocks Stratigraphy. The...northeast (McClay, in preparation); crosscutting dykes assumed to be apophesies to the footwall intrusive...faults which displace early Cretaceous lamprophyre dykes. ACKNOWLEDGEMENTS People who write about Sullivan...HELIKIAN —HADRYNI AN [==^~t] GABBROIC SILLS AND DYKES | p£g | GATEWAY FORMATION [ TV] NICOL CREEK FORMATION...Thickness Description East-dipping early lamprophyre dykes about 1 to 2 metres thick have been broken into |
