 | EDWARDS, R. A., WARRINGTON, G., SCRIVENER, R. C., JONES, N. S., HASLAM, H. W., AULT, L. (1997) The Exeter Group, south Devon, England: a contribution to the
early post-Variscan stratigraphy of northwest Europe. Geological Magazine, 134 (2) 177-197 doi:10.1017/s001675689700664x | Journal (article/letter/editorial) | | Variscan Deformation Front in northwest Europe (Fig. la). Hitherto, such studies have concentrated upon successions...mainland, such as the Saar-Nahe Basin in northeastern France and southwestern Germany (e.g. Korsch & Schafer...events such as tin-tungsten mineralization and quartz-porphyry dyke intrusion (Darbyshire & Shepherd...evidence from geochemical studies (see Section 4). Rhyolite and felsite clasts from the Bow Breccia, in the...the Bodmin Moor Granite (Fig. lb). In contrast, rhyolite and felsite 182 R. A. EDWARDS AND OTHERS CLAST |  | | Journal (article/letter/editorial) | | black shales with magmatic rocks, such as rhyolite, rhyolite-dacite, and trachyte-andesite at the Tersang... Penjom, Selinsing, and Buffalo gold deposits. Quartz veins have been sampled from high-grade zones in...petrography of fluid inclusions of gold-bearing quartz The purpose of this paper is to document petrography...petrography of fluid inclusions of gold-bearing quartz veins, determine temperature, salinity, and composition...Malaysia. (modified after [5]), Peninsular Malaysia. Outcrop and hand handspecimens specimensofofrock rock samples |  | | Journal (article/letter/editorial) | | Kotia and Canadian Jamieson VMS deposits (Fig. 1). Outcrop studies were supplemented by diamond drill core...numerous VMS occurrences (including the Steep Lake and Halfmoon Lake prospects) occur in the Kamiskotia Volcanic...mafic intrusive igneous rocks Cre DDH ek Steep Lake granophyre 5390000 5390000 ULT Enid not mapped...ROBB JAMIESON Godfrey Creek rhyolite (KVC) Halfmoon Lake Ski-Hill rhyolite (KVC) DDH DDH 03BHA0382 ...metavolcanic rocks ab Lake br oi c Co m pl ex base metal deposit ‘Shell outcrop’ DDH ROBB TURNBULL |  | | Report (issue) | | 1854184E, then N50°W about 200 ft to an 8 by 12-ft quartz monzonite boulder at the base of a rocky hill on...the old highway, in the top of a large granite outcrop. Read with meter facing north. MLEQB2A (F124)...of road, due south of the most prominent tuff outcrop, on low tuff ledge about 1 ft above ground level...Highway 203, on east side of highway, on large outcrop, S27°E 24.7 ft from USC&GS BM W911 1957 and marked...119° 00.05' 979,188.754 mGal 0.5 mi south along Lake Mary road from the outlet of Twin Lakes, on top |  | | Report (issue) | | u t in o n e s m a ll a rea . Th e y ar e o v e r la in un c o n f o rm ab ly by a bo u t 3 000 f eet...sedimentation. Most of the sediments antedate extinct Lake San Agustin, which occupied t h e g r a b e n i...i c activity in the graben younger than extinct Lake San Agustin. Volcanic rocks in the uplands peripheral...in the uplands and littoral deposits of extinct Lake San Agustin were plotted on contact aerial prints...called attention to the shore features of extinct Lake San Agustin, which once occupied the west end of |  | Parker, Don F., White, John C., Ren, Minghua, Barnes, Melanie (2017) Basement control of alkalic flood rhyolite magmatism of the Davis Mountains volcanic field, Trans-Pecos Texas, U.S.A. Lithos, 292. 234-249 doi:10.1016/j.lithos.2017.09.011 | Journal (article/letter/editorial) | | Accepted Manuscript Basement control of alkalic flood rhyolite magmatism of the Davis Mountains Volcanic field...Melanie Barnes , Basement control of alkalic flood rhyolite magmatism of the Davis Mountains Volcanic field... ACCEPTED MANUSCRIPT BASEMENT CONTROL OF ALKALIC FLOOD RHYOLITE MAGMATISM OF THE DAVIS MOUNTAINS VOLCANIC FIELD...Parker (Don_Parker@baylor.edu) AN Keywords: Flood Rhyolite; Alkaline Rocks; Geochemistry; Tectonic Setting...three major stratigraphic units: the Star Mountain Rhyolite (minimum 220 km3) of the eastern Davis Mountains |  | | Report (issue) | | accessibility from areas of high population density. These outcrop localities, mainly in the southeast, are not necessarily...Igneous rocks: a simplified classification 9 Some outcrop localities in southeastern Manitoba 10 l. Locality...elements) make up a variety of minerals , such as quartz , feldspar and many others . A mineral can be defined...COMMON ROCKS (Holmes) Igneous Rocks Minerals Quartz Feldspars Micas Clay minerals Chlorite Amphibole...nc::: S~ '"d H c::: :;d:;d Z 0 n ~ RHYOLITE QUARTZ Biotite Hornblende GRANITE ---TRACHYTE |  | | Journal (article/letter/editorial) | | categories. 3.1 3.1.1 Igneous rocks: extrusive Rhyolite Rhyolite specimens in the HV 5-8 area were examined...are porphyritic with large euhedral, transparent quartz crystals and lesser lathe-shaped, transparent crystals...included in a fine-grained groundmass. Samples of rhyolite from the Three Sites area are pale red in color...have been tentatively identified as siltstone. Rhyolite samples are porphyritic aphanitic, sometimes faintly...phenocrysts of euhedral quartz, sanidine and plagioclase feldspar. Samples of rhyolite recovered from the |  | Dusel-Bacon, C., Foley, N. K., Slack, J. F., Koenig, A. E., Oscarson, R. L. (2012) Peralkaline- and Calc-Alkaline-Hosted Volcanogenic Massive Sulfide Deposits of the Bonnifield District, East-Central Alaska. Economic Geology, 107 (7) 1403-1432 doi:10.2113/econgeo.107.7.1403 | Journal (article/letter/editorial) | | Totatlanika Schist Formation. Mystic Creek meta rhyolite and alkali basalt (Chute Creek Member) constitute...peralkaline quartz porphyry containing veins of fluorite, sphalerite, pyrite, and quartz intrudes the...mid-1990s of Zn-Pb-Ag VMS deposits in the Finlayson Lake district, which lies within an outlier of the allochthonous...Bonnifield NA Fa u Ak YT lt WM SIN Finlayson Lake Wh Arc assemblages Yukon-Tanana terrane Permian...ablation– inductively coupled plasma–mass spectrometry (LA-ICPMS). Complete geochemical data, methods used, |  | Li, Yan, Cui, Jia-Rui, Han, Zhi-Bin, Nie, Feng-Jun, Hou, Xiao-Gung, Yan, Zhao-Bin (2022) Chronology and Geochemistry of Early Cretaceous Magmatism in the Northwestern Erguna Block, Northeast China. Minerals, 12 (3) 303 doi:10.3390/min12030303 | Journal (article/letter/editorial) | | rocktectonic primarily consists granitepart andof rhyolite The Erguna Massif is magmatic an important unit...and a blocky structure. It is mainly composed of quartz (30–35 wt%), plagioclase (25–30 formed during the...mainly microcline with of occasional The period quartz occurred has a particle size of 2– Block and its...zircon, and titanite (FigureLate 2c).Mesozoic The rhyolite is gray activities were widely distributed this...magmatic rock primarily consists of granite and rhyolite (Figure 2a,b) and is spread in a northeasterly |  | | Report (issue) | | Products of these sporadic eruptions include rhyolite and quartz latite domes with associated pyroclastic...in Long Valley has produced post-caldera rhyolite or quartz latite eruptions (R. Bailey, oral -4commun...benchmarks are arranged in a triangular array on rhyolite outcrops. BM Y is 2.9 m S31°E of pole A366; BM...X is near the western end of a prominent rhyolite outcrop along the first crest of the knob; BM Z lies...stones. Benchmarks X and Z are located on large rhyolite outcrops near the head of the fault scarp; BM |  | | Journal (article/letter/editorial) | | Geophysics, University of New Orleans, New Orleans, LA 70148. Contributed Papers in Specimen Mineralogy:...4 Ma) granite, granophyre, and comagmatic rhyolite outcrop on Cary Mound in western Wood County, Wisconsin...host. Typical pegmatite mineralization includes quartz, microcline, fluorite, allanite-(Ce), and zircon...portions of miaroles are generally filled with quartz ± later chlorite, sulfides, fluorite, magnetite...Sciences, University of New Orleans, New Orleans, LA 70148; 293 Main St., No. 9, Andover, MA 01810. The |  | | Journal (article/letter/editorial) | | “(U–Th)/He dating of fluorite: application to the La Azul fluorspar deposit in the Taxco mining district...temperature . Rhyolite . (U-Th)/He dating . MVT-like deposits . Resetting Introduction The La Azul fluorite...mesothermal to epithermal veins and mantos. Recently, La Azul has been restudied by Pi et al. (2005), presenting...fluorite in general. Geological sketch of the La Azul deposit The La Azul deposit belongs to a series of stratabound...syn- to post-orogenic Laramide age, including the La Encantada-Buenavista district and the El Tule deposit |  | | Journal (article/letter/editorial) | | The average magmatic 6180 value for a Lebombo rhyolite is calculated to be about 5.6%0, with lowest value...presence of large volumes (>30,000 km3) of low-6180 rhyolite in the Lebombo monocline is attributed to large-scale...large-scale interaction between the source(s) of the rhyolite and meteoric water. Deep penetration ( > 10 km)...5.7% (e.g., KYSER, 1986; ITO et al., 1987). A rhyolite derived by partial melting of such material should...exceeds that of previously recognised low-6 I80 rhyolite from Iceland (< 100 km3 ?), Yellowstone (6000 |  | Uysal, I. Tonguç, Gasparon, Massimo, Bolhar, Robert, Zhao, Jian-xin, Feng, Yue-xing, Jones, Greg (2011) Trace element composition of near-surface silica deposits—A powerful tool for detecting hydrothermal mineral and energy resources. Chemical Geology, 280 (1) 154-169 doi:10.1016/j.chemgeo.2010.11.005 | Journal (article/letter/editorial) | | occur at the surface associated with sub-surface quartz veining and epithermal Au mineralisation in the...element composition of the sinter deposits and quartz veins in an attempt to develop a new geochemical...REE) concentrations in comparison to hydrothermal quartz veins from various granitic-pegmatitic systems...in the source material (e.g., rhyolite intrusions). Sinters and quartz veins and some volcanic source...hydrothermal activity. The majority of sinter and quartz samples within or near the Au mineralisation zone |  | | Journal (article/letter/editorial) | | geological and geochronological relationships between a rhyolite, belonging to the Transscandinavian Igneous Belt...on zircons). Field relations suggest that the rhyolite rests unconformably on the B~ickabyintrusion,...granitoids within the Svecofennian Domain. The rhyolite yielded an age of 1800 + 8 Ma and a tonalite belonging...yielded an age of 1834 + 3 Ma. The age of the rhyolite is slightly older ( 10-15 Ma) than adjacent granitoids...Domain further to the north, is found southeast of Lake V~ittern (Welin et al., 1966; Aberg, 1978) (Fig |  | | Report (Issue volume) | | One-inch Maps 38 and 40, was made by Sir H. T. de la Beche, Jo-hn Phillips, D. H. \\ illiams, [Sir] A...Photo. 766) Frontispiece 11.-Granite-veins in the Quartz-Diorite of Brandy Bay, ... 9 Talbenny (G. S. Photo...Skomer Arenig Volcanic S e r i e s, incl11ding rhyolite, trachyte, kerato phyre, mugearite, basalt, dolerite...quartzqua1·tz- Johnston Series diorite. albite rock and quartz-dolerite Extrusive felsites and rhyolites, with...spherulitic rhyolite, and breccia. The Johnston Series comp1�ises quartz-diorites, quartz.. albite rocks |  | McNicoll, Vicki, Dubé, Benoît, Castonguay, Sébastien, Oswald, William, Biczok, John, Mercier-Langevin, Patrick, Skulski, Thomas, Malo, Michel (2016) The world-class Musselwhite BIF-hosted gold deposit, Superior Province, Canada: New high-precision U–Pb geochronology and implications for the geological setting of the deposit and gold exploration. Precambrian Research, 272. 133-149 doi:10.1016/j.precamres.2015.09.029 | Journal (article/letter/editorial) | | of Canada, 490 rue de la Couronne, Québec, QC G1K 9A9, Canada 19 3 20 la Couronne, Québec, QC G1K...Canada 21 4 23 24 25 d INRS Institut national de la recherche scientifique, centre Eau Terre Environnement...replacements and as local discordant 68 syntectonic quartz veins within Algoma-type iron formation in mixed...101 tectonic boundary with the gneissic Island Lake Domain (ILD; Fig. 2). The North Caribou greenstone...Opapimiskan Lake along the tectonic contact (DLFZ on Fig. 2) with the ca. 2857 Ma 112 Schade Lake gneiss |  | | Report (volume) | | batholithic rocks...------------------------Butte quartz monzonite ________________________________ Coarse-grained...alteration.__________________________________ Age of quartz monzonite and related rocks.-----.------------Tertiary...______________________________ Age relations of quartz latite and rhyolite____-_______---__--_ Page 52...auriferous pyrite____________________ Deposits in quartz veins___ _______________________________ Secondary...map showing generalized distribution of types of quartz monzonite within the Boulder batholith, Basin quadrangle |  | Fan, Xingzhu, Sun, Fengyue, Xu, Chenghan, Wu, Dongqian, Yu, Lu, Wang, Li, Yan, Cheng, Bakht, Shahzad (2022) Volcanic rocks of the Elashan Formation in the Dulan-Xiangride Basin, East Kunlun Orogenic Belt, NW China: Petrogenesis and implications for Late Triassic geodynamic evolution. International Geology Review, 64 (9) 1270-1293 doi:10.1080/00206814.2021.1923074 | Journal (article/letter/editorial) | | calc-alkaline I-type char acteristics, with low Sr/Y and (La/Yb)N ratios and prominent negative Eu anomalies....crystalline debris tuffs mixed with andesite, rhyolite, dacite, volcanic agglomerate, and volcanic brec...exhibits a porphyritic texture. Phenocrysts contain quartz (10–15 vol%), plagioclase (5–10 vol%), and minor...porphyritic texture and rhyolite structure (Figure 3b). Phenocrysts (10–15 vol%) contain quartz, plagioclase, and...(occasionally partly resorbed) (Figure 4(c,d)). The large quartz phenocrysts are mainly 1–1.2 mm in size (Figure |  | | Report (issue) | | fragment 7 Photomicrograph under plane light of rhyolite 8 Photomicrograph under plane light of upper conglomerate...are composed of principally gabbro, granite, and rhyolite. These igneous rocks are late Precambrian-Cambrian...the Raggedy Mountain Gabbro Group is the Carlton Rhyolite Group that is described at the Bally Mountain...sections by Ham and others (1964). The Carlton Rhyolite Group is composed of rhyolitic lavas interbedded...Group and the lower part of the rhyolite flows of the Carlton Rhyolite Group. In the area between the |  | | Journal (article/letter/editorial) | | considered to be correlated with the 'type' formations. Quartz porphyry rhyolites of the Makwassie Formation in...unconformably overlain by the Transvaal Supergroup. The outcrop and suboutcrop extends over a roughly elliptical...Supergroup. The Makwassie Formation quartz porphyry (dacite and rhyolite) is widely distributed in the western...and terranes of the Kaapvaal Craton, showing the outcrop area of the Archaean Ventersdorp Supergroup (dark...16 Ma. A borehole sample of the lower Makwassie quartz porphyry (middle Platberg 207 206 Group) yielded |  | Meremonte, M.E., Cranswick, Edward, Gomberg, J.S., Worley, D.M., Carver, D.L., Brooks, J., Banfill, Robert, Overturf, D.E., Bice, T. (1993) Report on seismologic field investigations of the 29 June 1992 Little Skull Mountain Earthquake. Open-File Report Vol. 1993 (93-555) US Geological Survey doi:10.3133/ofr93555 | Report (issue) | | YUCCA FLAT SPRINGDALE SPRINGDALE YUCCA FLAT YUCCA LAKE Table 2 (continued). List of earthquakes > ML=2...LATHROP WELLS SW STRIPED HILLS STRIPED HILLS YUCCA LAKE FRENCHMAN FLAT JACKASS FLATS SCRUGHAM PEAK SCRUGHAM...underlying Paleozoic rocks can be observed in outcrop exposures of limestones and dolomites in the Calico...ash-flow tuff (upper quartz latite, middle rhyolite, and lower high-silica rhyolite); H50 CALICO HILLS...HILLS / SHOSHONE MTN. - Rhyolite to quartz latite ash-flow tuffs (multiple flow compound cooling unit, large |  | | Report (volume) | | geologic time scale) basalt, andesite, dacite, rhyolite, and lahar deposits. South of the study area lakebed...including tufa deposits and strandlines from Pleistocene Lake Lahontan, are present. The central part of Mineral...resource potential for perlite. The area underlain by rhyolite south of the claims has low mineral resource potential...volcanic rocks (Tertiary) Consists of dacite and rhyolite Andesite and lahar deposits (Tertiary) Basalt...(1960) mapped this deposit as part of a Pliocene rhyolite unit in contact with andesite and intermediate-to-felsic |  | | Report (issue) | | chemical composition. Fluorite, calcite, barite, and quartz are the chief primary minerals of the veins. Galena...characteristic octahedral shape as shown in fig. la. Each face of a cleavage fragment of fluorite usually...light, and material which has been exposed in an outcrop for some time is invariably colorless or white...will not scratch window glass, (differing from quartz which will scratch window glass). Specific gravity...normally is associated with variable amounts of quartz and calcite and usually with barite. In veins in |
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Rhyolite outcrop, La Charbonniere Lake, Fréjus, Draguignan, Var, Provence-Alpes-Côte d'Azur, France