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| rock types V/eathering and outcrops willow Creek rhyolite General character and distribution ............Petrography Megascopic -.iicroscop 1 _ 1 rhyolite. General character and distribution. Contacts...Microscopic Weathering and outcrops Windy gulch rhyolite breccia General character and distribution Petrography...Comparison with Campbell Mountain rhyolite Hazanoth Mountain rhyolite General character and distribution...outcrops Comparison with the Campbell Mountain rhyolite Hhyolite tuff General character and distribution |
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| mudflow deposit, and flow ____________________________________ _ Rhyolitic ash-flow tuff ______________________...and Lloyd shaft ____ --_-----_Manganese Hill and Chimney Hill mines_Last Chance mine _________________...fluorspar mine. Geologic maps of the Manganese Hill and Chimney Hill fluorspar deposits. Geologic maps and vertical...semiquantitative spectrographic analyses, gray rhyolite flow, Ruby Mountain, Chaffee County_ Sample data...surface is a pediment of late flow deposit, and a rhyodacite porphyry flow of Eocene ( ?) age Tertiary |
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| interlayered shale and rhyolite extrusives of Middle Silurian age and (2) rhyolite and basalt extrusives...MEMBER Basalt and rhyolite flows; minor argillite 2200:^ UPPER RHYOLITE MEMBER Rhyolite flows and tuffs...2300 ± LOWER RHYOLITE MEMBER Basalt flows; minor rhyolite flow breccia, and scoria Rhyolite flows LOWER... en c/s 0 Tl faulting Hornfelsic shale and rhyolite QUODDY SHALE o C Absent in mapped area OAK...Brunswick. It was named from exposures at the village of Oak Bay, New Brunswick (Alcock, 1946a; 1946b) |
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| Rio Grande from north of Weminuche meadows, San Cristobal quadrangle. The upper cliff-forming flow is...is Piedra rhyolite; the lower talus-covered slopes are underlain by Huerto quartz latite and Alboroto rhyolite...rhyolite. Geology and Petrology of the San Juan Region Southwestern Colorado By ESPER S. LARSEN, JR...granite. _____________________ Granite of the Rio Grande Canyon, in the western part of the San Cristobal...diorite---------------The Iron Hill complex.. _____________________ Marble of Iron Hill. ____________________ |
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| within the basalt sequence, whereas thick rhyolite flows and ash-flow tuffs predate the basaltic volcanism...basalts and rhyolite ash-flow tuffs and flows typical of the Basin and Range basalt-rhyolite association...Mile Hill (1). ST=avg. of 3 unconsolidated tuffaceous silicic units. SF=avg. of 4 rhyolite-flow/ash-flow...rhyolite-flow/ash-flow units. FeO*=total Fe as FeO. All major elements in weight percent, trace elements in parts per million...units (ST); and highSi0 2 , welded ash-flow and rhyolite-flow units (SF of Table 1). Petrographically |
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| and field relationships of the Tardree Tertiary Rhyolite Complex, County Antrim, Northern Ireland, by R...PLATH 4. The Tardree Rhyolite Dome from Camearny Plantation Columnar rhyolite of Tardree Dome Fan-shaped...Fan-shaped arrangement of rhyolite columns Platy rhyolite of Scolboa Flow Welded rhyolitic tuff with eutaxitic...in Northern Ireland .. Geology of the Tardree Rhyolite Complex Plan of the Sandy Braes vent .. Section...subophitic, pale brown augite, plagioclase zoned from andesine to oligoclase, scattered quartz anhedra, and accessory |
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| ............ '. ................ Willow Creek rhyolite............................................................................ Campbell Mountain rhyolite........................................... General................................. 38 Windy Gulch rhyolite breccia.........................................with Campbell Mountain rhyolite...................... 40 Mammoth Mountain rhyolite........................Comparison with Campbell Mountain rhyolite...................... 43 Rhyolite tuff........................ |
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| ........................ Sugarlump latite and rhyolite tuffs ............................................................... Kneeling Nun rhyolite tuff ........................................................................................ Box Canyon rhyolite tuff ......................................................................... Caballo Blanco rhyolite tuff ................................................................. Razorback andesite and rhyolite ............................................. |
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| Garita Quartz Latite ________________________ _ Rhyolite of Miners Creek _______________________ _ Shallow...____________________ _ Bachelor Mountain Rhyolite ____________________ _ Farmers Creek Rhyolite ________________________...__ _ Mammoth Mountain Rhyolite ___________________ _ Rhyolite neck and flow near Shallow Creek _______..._______ _ Wason Park Rhyolite __________ ---- ____________ _ Huerto Formation ______________________________...deposits in the Creede Formation _______ -----Monon Hill mine ____________________ --- __ -----Solomon-Holy |
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| occur in or near autobrecciated plugs of biotite rhyolite. The ores of the Axe Handle mine are in altered...period of erosion by biotite rhyolite flows and pyroclastics, It is in the rhyolite plugs formed during this...the quicksilver deposits are found. Finally, the rhyolite flows and tuffs were moderately eroded, and in...autobrecciated parts of a southwestward-pitching rhyolite plug. Two dikes, one extending northwestward and...tilted Clarno formation and younger pumiceous rhyolite tuffs, is in contact at many places with the upper |
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| the caldera. (See photographic point. pl. 1). Rio Grande has cut its va lley in soft lacustrine deposits...______________ --- __ ----- _------ - ---Bachelor Mountain Rhyolite ____ -- __ -_-- __ -----_-_--Distribution and...eutaxitic and fluidal structures_______ Farmers Creek Rhyolite ____________ - _-- __ -------- -- Distribution...composition ________________ -____ Mammoth Mountain Rhyolite _______________ -_-_---__ Source_____________..._ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Ash flow boundaries and partings_________________ Characteristics |
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| ............................................. Rhyolite.................................................................................... Siliceous rhyolite.......................................................................... Andesite and andesite flow breccia.......................................................................................... Flow contacts within the lava belts....................57 60 60 62 62 62 64 64 66 67 68 Page 1. Lava flow belts and major structural features of Noranda district |
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| granite........................................ Rhyolite and aplite......................................above these basement rocks. Massive rhyolitic ash-flow tuffs in the northeast and west-central parts of...Rawdh Quadrangle (fig. 1), named for the largest village in the map area, centers 150 km southwest of Ha'il...Ha'il and is directly north of the village of Hulayfah in the northern Hijaz region of Saudi Arabia. The...combined Wadi Asmarah-Wadi Qahd and the Wadi Ar Rumah, flow southeast through the quadrangle. The combined Wadis |
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| ORIGINAL PAPER Microlite orientation in obsidian flow measured by synchrotron X-ray diffraction Michael...Clinopyroxene and plagioclase (andesine) microlites in an obsidian flow from Glass Mountain (NE California...[001] in the flow direction and (010) aligned parallel to the inferred flow plane. Andesine, with a platy...displays an alignment of (010) platelets in the flow plane. Some pole densities exceed 90 multiples of...information about flow, fragmentation, and solidification processes. Microlites are oriented by flow, and their |
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| ................. Red Rock by metamorphism of rhyolite.................................................in oxides from base of the Endion sill to the rhyolite above........... 1147 5. Diagram of normative...in oxides from base of Lester River sill to the rhyolite above....... 1158 8. Relative amounts of albite...Variation diagrams of the Duluth sills and overlying rhyolite flows................ 1167 11. Alkali-silica ratios...intrusive into flows of Keweenawan basalt and rhyolite. Three of the sills are large, and each consists |
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| Canyon Foqnation ___________·_ -'- __ ~ ____ _ Oro Grande Formation _____________________ _ Fairview Valley...Quartz latite felsite ________________________ _ Rhyolite aplite ___ ---.-- ______ ~ _____________ _ Hornblende...Antelope Butte, Rosamond, and Mojave areas __ Gem Hill Formation ________________ ~_-Bobtail Quartz Latite...-----------------Gray andesite porphyry ________________ _ Rhyolite felsite ________________________ _ Bedrock Spring...lava flows and plugs ranging in composition from rhyolite to basalt. These rocks rest upon a deeply eroded |
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| siltstone composedof rhyolite detritus to 211 feet (64 3 m), and bedrock rhyolite. Hydrothermal minerals...1) penetrated the same glacial depositsand rhyolite flow as Y-1 (seebelow) and reached a maximum temperature...siltslone ] IAA (?) Colluvial Dreccra 1-l Rhyolite flow Frc. 2. Distribution of fresh obsidian, devitrification...in the gravei layers are varicolored lithoidal rhyolite having a devitrified groundmass composed of alkali...or quartz) Sporadic cavities in the lithoidal rhyolite contain crystals of tridymite and alkali feldspar |
 | Kerr, Paul F., Brophy, Gerald P., Dahl, Harry M., Green, Jack, Wollard, Louis E. (1957) Marysvale, Utah, Uranium Area - Geology, Volcanic Relations, and Hydrothermal Alteration. GSA Special Paper 64. Geological Society of America | Report (issue) |
| Thin-section sketches of several rock types -. Fifty-foot flow fold in pyroxene andesite .... Erosional unconformity...series . red rhyolite . Cross sections in Mount Belknap series . Mount Belknap red rhyolite -. Mount Belknap...Belknap porphyritic glass Lineation in red rhyolite . . Mount Belknap flows between Beaver and . Flows...cover 23. 24. 25. Mount Belknap brecciated gray rhyolite basal glass Bs 26. Conglomeratic Sevier River...from a long dike west of “The Plug” 35. Glassy rhyolite cutting quartz monzonite . . 36. 37. 38. 39. |
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| andesitic complexes that largely predate major ash-flow eruptions and related cauldron subsidence in the...II - Quartz latitic or dacitic to rhyolitic ash-flow tuffs and associated intrusive and extrusive rocks...the post ash-flow tuff andesites and associated rocks on the other. Group III - Post ash-flow tuff andesites...rocks to be in the subalkaline field. Three ash-flow tuff analyses fall in the alkaline field, but are...36 2.20 7,70 1 .24 0.51 0.13 0.04 0.05 43 ASH-FLOW TUFfS AND ASSOCIATED ROCKS 100.001 98.0BO 0.041 |
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| of granite, quartzite, aplite, and quartz in rhyolite flow ………...........................................conformable sequence, followed by 5,000 ft of rhyolite flows and intercalated basic sills. A small outcrop...block tilting of the range with respect to the Rio Grande Valley on the downthrown side. Small scarps in...Mountains, a familiar landmark to travellers in the Rio Grande Valley in the vicinity of Belen, affords an unusually...still another part is interpreted as a series of rhyolite flows. Of especial interest in this area are large |
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| .......................................... 10 Rhyolite ite intrusives .................................miles east of the Rio Grande, and lies 14 miles southeast of Domingo, a village on the Atchison, Topeka...pattern is radial and drains southeastward to the Rio Grande. CLIMATE AND VEGETATIO N The climate of the Cochiti...except for a few stretches fed by springs. They flow only during periods of melting snow or during summer...rhyolitic and andesitic flows. The Pleistocene rhyolite, which crops out at Bland, had as its source the |
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| Gravel and silt member___________________________ Rhyolite member..........................................---------------------------------------------------·-Rhyolite intrusives of the northern Santa Rita Mountains...____ __ ___ Photomicrograph of vitrophyre from a flow in the rhyodacite member of the Grosvenor Hills...--25. Map showing the distribution of Oligocene rhyolite intrusives of the northern Santa Rita Mountains...Tuffaceous sandstone and overlying massive nearly white rhyolite tuff beds intercalated in the lower part of the |
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| columnar section of the John Day Formation_____ Rhyolite dome in the lower part of the John Day Formation...Columnar-jointed ash-flow sheet-----_---------__-_-------Lithophysae in a welded ash-flow sheet.-------------------X-ray...feldspar,___________________ Spherulite-bearing ash flow of the John Day Formation at the Friday agate d...weakly welded rhyolite ash flows, and less abundant trachyandesite flows and rhyolite flows and domes...ledge-forming welded ash-flow sheets. Most of the sheets are composed of stony rhyolite containing abundant |
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| .............. 6 Rhyolite................................... Rhyolitic ash-flow tuff....................................................... 12 Rhyolite flow and rhyolitic tuff..................... 12 Basalt...alkali-feldspar granite. Two small outcrops of Tertiary rhyolite are present in the quadrangle. The predominant...rhyolitic tuff near the southeastern corner and rhyolite in the north-central part of the quadrangle. Unconsol...subaerial explosive eruptions and deposition of ash-flow and ash-fall tuff. Rocks in the western part of |
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| Plain–Yellowstone Region and Adjacent Areas The Littlefield Rhyolite and associated mafic lavas: Bimodal volcanism...province, with constraints on age and storage sites of Grande Ronde Basalt magmas Brian M. Webb1, Martin J. Streck1...Health Sciences, Eastern Oregon University, La Grande, Oregon 97850, USA 1 CITATION: Webb, B.M., Streck... W.C., and Ferns, M.L., 2019, The Littlefield Rhyolite and associated mafic lavas: Bimodal volcanism...province, with constraints on age and storage sites of Grande Ronde Basalt magmas: Geosphere, v. 15, no. 1, p |
