 | | Report (volume) | | Geology, StratigraphicPliocene. 3. Volcanic ash, tuff, etc.-West (U.S.) 4. Geology-West (U.S.) I. Obradovich...Mineralogy of Bishop Tuff and Bishop ash beds 5 Chemical composition of Bishop Tuff and Bishop ash beds...age of Bishop Tuff 18 Ash beds and tephra units older than but similar to the Bishop Tuff 23 Black Canyon-4...Bishop Tuff at the Insulating Aggregates Co. quarry 6 3. Photograph of cobbles of welded tuff (Bishop...(Bishop? Tuff) collected from conglomerate at California Industrial Minerals mine 14 4. Photograph of a sawed |  | | Journal (article/letter/editorial) | | Balaton Highland, Hungary P. KÓNYA1,* 1 2 AND S. SZAKÁLL2 Geological Institute of Hungary, Stefánia út...út 14, Budapest H-1143, Hungary Department of Mineralogy and Petrology, University of Miskolc, Miskolc-Egyetemváros...Miskolc-Egyetemváros H-3515 Hungary [Received 22 August 2010; Accepted 18 July 2011] ABSTR ACT Haláp...Bakony– Balaton Highland Volcanic Field, Tapolca, Hungary. Cavities in the basalt contain miarolitic minerals...minerals (augite, apatite, magnetite, plagioclase and sanidine), zeolites (analcime, chabazite-Ca, chabazite-Na |  | | Report (issue) | | Mineralogy of Bishop Tuff and Bishop ash beds Chemical composition of Bishop Tuff and Bishop ash beds...Volume of Bishop ash 13 Potassium-argon age of Bishop Tuff 15 Preparation of samples for potassium-argon dating...Older ash beds and tephra units similar to Bishop Tuff 18 Black Canyon-4 ash bed 10 Frenchman Flat ash...of the lower part of the Bishop Tuff at the Insulating Agrregate quarry about 10 km north of Bishop, Calif...samples of sanidine, plagioclase, biotite, and glass separated from samples 14 of the Bishop Tuff 17 Figure |  | | Report (issue) | | E N C E S Report N o. 69/6 THE TERTIARY WELDED-TUFF VENT AGGLOMERATE AND ASSOCIATED ROCKS AT SANDY BRA...I.B. and Sabine, P.A. 1969. The Tertiary welded tuff vent agglomerate and associated rocks at Sandy Braes...Rhyolitic tuff (t-uffisite dyke) C. Obsidian·tuff 6 Photomicrographs A. Welded tuff in agglomerate...Obsidian tuff C. Devitrified welded tuff Plate 4. 5 Agglomerate ., Sandy Braes Quarry A. Plate...Photomicrographs A. Obsidian tuff.. B. Devitrified welded tuff C. Obsidian tuff 8 • • • 111 SUMMARY |  | | Report (chapter) | | of 83 singlecrystal laserfusion analyses of sanidine, 45 resistance furnace stepheating analyses...(Antero Tuff, 33.8 Ma; Badger Creek Tuff, 33.8 Ma; Thorn Ranch Tuff, 33.7 Ma; and Gribbles Park Tuff, 32...ignimbrites (Wall Mountain Tuff, 36.7 Ma; tuff of Stirrup Ranch, 36.5 Ma; and East Gulch Tuff, 33.7 Ma). Two ignimbrites...ignimbrites (Fish Canyon Tuff, 27.8 Ma; and Carpenter Ridge Tuff, 27.4 Ma) erupted from the San Juan volcanic...Range, South Park, and the ignimbrite (ashflow tuff) rem nants in the Castle Rock area of the High |  | | Report (volume) | | of a soda sanidine crystal partly rimmed by myrmekitic intergrowths of quartz and sanidine ___________...Formation of Eocene age lava flows, volcanic breccia, tuff, and tuffaceous mudstone, chiefly of andesitic composition;...in detail, consists of about 4,000 feet of tuff, lapilli tuff, strongly to weakly welded rhyolite ash flows...soda sanidine, but including less abundant quartz, myrmekitic intergrowths of quartz and sanidine, and...contrast to some of the interbedded air-fall tuff and lapilli tuff of dacitic and andesitic composition that |  | Hereford, Richard, Beard, L. Sue, Dickinson, William R., Karlstrom, Karl E., Heizler, Matthew T., Crossey, Laura J., Amoroso, Lee, House, P. Kyle, Pecha, Mark (2016) Reevaluation of the Crooked Ridge River—Early Pleistocene (ca. 2 Ma) age and origin of the White Mesa alluvium, northeastern Arizona. Geosphere, 12. 768-789 doi:10.1130/ges01124.1 | Journal (article/letter/editorial) | | volcanic clasts as well as Oligocene–Miocene detrital sanidine related to multiple caldera eruptions of the San...Mountains and elsewhere. These exotic clasts and sanidine likely came from ancient rivers draining the San...Combined 40Ar/39Ar dating of an interbedded tuff and detrital sanidine ages show that the basal White Mesa alluvium...at 1.993 ± 0.002 Ma, consistent with a detrital sanidine maximum depositional age of 2.02 ± 0.02 Ma. Geomorphic...interbedded with 1.2–0.8 Ma Bishop–Glass Mountain tuff. The new ca. 2 Ma age for the White Mesa alluvium |  | | Report (issue) | | is a date of 288 m.y. from the rhyolitic Rrassac tuff, France, which is interbedded with basal upper Stephanian...upper Visean strata; 328 m.y. for the Malvavaux tuff, France, which is interbedded with fossiliferous...this rise in sea level is marked by the Bandera Quarry Sandstone Member and interdistributary bay muds...stratigraphic succession, be¬ ginning with the Bandera Quarry Sandstone, Amoret Limestone, Lake Neosho Shale...water. The depth of river channels in the Bandera Quarry Sandstone reaches 44 ft or 13 m (Manos, 1967), |  | Sarna-Wojcicki, Andrei M., Reheis, Marith C., Pringle, Malcolm S., Fleck, Robert J., Burbank, Doug, Meyer, Charles E., Slate, Janet L., Wan, Elmira, Budahn, James R., Troxel, Bennie, Walker, James P. (2005) Tephra layers of blind Spring Valley and related upper Pliocene and Pleistocene tephra layers, California, Nevada, and Utah: Isotopic ages, correlation, and magnetostratigraphy. Professional Paper 1701. US Geological Survey doi:10.3133/pp1701 | Report (issue) | | ……………………………………………………………… 12 Basal arkosic mudflows and the tuff of Benton Hot Springs …………………… 12 Tuffs of Blind...Pit 5, Cowan Pumice Mine … 18 11. Photograph of tuff of Blind Spring Valley in Pit 2, Cowan Pumice Mine...……………………………………………………………………………… 29 14. Photograph showing tuff of Benton Hot Springs, near base of Rimrock section...Valley, California-Nevada 31 16. Photograph of Bishop Tuff near head of Yellowjacket Canyon ……………………… 32 17...tephra units …… 39 20. Photograph showing exposure of tuff of Blind Spring Valley in Beaver Basin, Utah … 44 |  | | Report (volume) | | Lewis and Clark Co. 2. Geology Montana Cascade County. 3. Mines and mineral resources Montana Lewis and...4. Mines and mineral resources Montana Cascade County. I. Title. II. Series: United States. Geological...Construction stone ________________________. Welded tuff ____________________________. Latite and trachyte...rocks, latitic and trachytic lava flows, and ashflow tuff. The eastern facies, also largely of continental...be utilized as construction stone include welded tuff, latite and trachyte, trachybasalt, quartzitic sandstone |  | | Book | | monzonite (Monzoni, Tyrolean Alps), nelsonite (Nelson County, Virginia), nevadite, norite (Norway), pacificite...QUARTZ bombs and subangular fragments lying in a tuff matrix. [L. ad, to + glomus, ball] (Lyell in 1831)...the presence of glassy cement and the absence of a tuff matrix. Also spelled agglutinite. [L. ad, to + glutinare...found in brown coal. Also spelled ajkite. [Ajka, Hungary] (Hlasiwetz in 1871) akafoamite ig., meta.? Rarely...Also named albert coal. [Albert shale of Albert County, New Brunswick] (How in 1860) albitite ig. dike |  | | Journal (article/letter/editorial) | | s. 1/C 1 Petrographic features of lava rock and tuff clast-bearing sedimentary rocks at the base of the... but in some places the amount of lava rock and tuff clasts are significant, and chert, sandstone and...regard to those of volcanic origin. The lava rock and tuff clasts are strongly weathered. However, on the basis...feldspar and mafic minerals); (iv) dacite–rhyolite tuff (with juvenile glass shards and pumice; crystals:...pseudomorphs after pyroxene and biotite); (v) rhyolite tuff (juvenile pumice and glass shard; crystals: pseudomorphs |  | | Journal (article/letter/editorial) | | Currant tuff General description Methods of study Crystal tuff Crystal-vitric tuff Vitric-crystal tuff Vitric...volcanics Porphyritic quartz latite Latite crystal tuff Interpretation of the chemical characteristics of...small dense, white masses in a Tertiary volcanic tuff, here named the Currant tufi, in White Pine and...possible use hi ceramics. In scattered areas the tuff has been altered by solutions rich in magnesium...have been derived from the same parent magma. The tuff formation, which ranges in thickness from a few |  | | Journal (article/letter/editorial) | | suite. Total-fusion biotite and sanidine ages from eight Chegem Tuff samples, both intracaldera and outflow...cross-cutting granodiorite porphyry intrusion has a sanidine total fusion age of 2.84 + 0.03 Ma, and whole-rock...a single cooling unit of caldera-filling welded tuff and bearing little evidence of pre-caldera volcanism...faulted the caldera fill and pushed up a block of tuff, somewhat analogous to resurgent structures in calderas...resurgence has not significantly domed the intracaldera tuff in the way commonly observed (e.g., Yellowstone |  | | Journal (article/letter/editorial) | | compositions of melt inclusions from the Bishop Tuff and the generation of silicic magma John N. Christensen...bearing quartz (MIBQ), extracted from the Bishop Tuff (BT), representing what is arguably the world’s...the basis of 40Ar-39Ar dating. Most of the Bishop Tuff magma, particularly the later erupted portions,...a larger complex system. By _ 1.2 Ma the Bishop Tuff magmatic system expanded to include the Glass Mountain...younger than _ 1.0 Ma in any samples from the Bishop Tuff (or * Corresponding author. Tel.: + 1 313 763 4767 |  | | Report (issue) | | Part 3 which describes exposures of the Nine Hill Tuff near Soda Springs, California. PART 1. INDIAN PEAK...prolonged history. Representatives of the vast outflow tuff sheets which surround the caldera complex (fig....CALDERA COMPLEX Age (Ma) Dacite tuff crystal-rich Rhyolite tuff crystal-poor 27± Isom Formation*...Wash Tuff 21,000 1,500+ N part of complex <500? NE part of complex 32± crystal-poor tuff *trachydacite...to Lund Formation) reflect 4-6(?) km thickness of tuff in it and older Indian Peak caldera (IP, related |  | | Report (issue) | | unconformable contact with the tuff of City of Rocks, diatomite of Clover Creek and tuff of Gwin Springs. The basalt...dips 2° to the southeast. The upper surface of the tuff of Gwin Springs dips 5° southeast. The unit was...ryolites: Idaho State University, M.S. thesis, 144 p. Tuff of City of Rocks - Normal-polarity, crystal-rich...granular sand. The unit is known for the Gooding County recreational area: Gooding City of Rocks, off Idaho...of the rhyolites in the Davis Mountain quad. The tuff of City of Rocks crops out in the extreme southeast |  | | Journal (article/letter/editorial) | | Potassium-Argon Age and Paleomagnetism of the Bishop Tuff, California Abstract: Duplicate potassium-argon...separated localities indicate that the age of the Bishop Tuff, California, is about 0.7 million years. Two of...collected within 1 m of the contact of the Bishop Tuff with the underlying Sherwin Till. The third sample...from near the present exposed surface of the Bishop Tuff. The minimum age of the Sherwin Till (Kansan?) is...localities indicate that the welded part of the Bishop Tuff became magnetized when the geomagnetic field was |  | | Journal (article/letter/editorial) | | Fish Canyon 19 Tuff sanidine (FCTs) and the ca. 1.2 Ma Alder Creek Rhyolite sanidine (ACRs), vary by...reference minerals Fish Canyon Tuff sanidine (FCTs), Alder 26 Creek Rhyolite sanidine (ACRs) and Mount Dromedary...relative to the astronomically tuned age of A1 Tephra sanidine (A1Ts), Faneromeni 28 section, Crete [Rivera...system, compared to most previous studies. All sanidine samples 31 (FCTs, ACRs and A1Ts) exhibit discordant...previous inferences, these results imply that the sanidine samples are suitable 37 reference materials |  | | Report (issue) | | Geology and Petrography of the Sonora Pass Site, Mono County, California, by David V. Haines. ........ Abstract............ 112 Petrography and Geology of Bishop Tuff and Mono Ash Sites, California, by David V. Haines...Drill Hole 1 ................... 124 Tuff from the Bishop Tuff Site. ............. 125 Mode ........... 146 Mono Drill Hole 1 .................... 148 Tuff from the Mono Ash Site ............... 149 Mineral..................... 153 Modal Composition of the Tuff .............. 158 Petrography of Ash-Pumice Deposits |  | | Journal (article/letter/editorial) | | com/locate/chemgeo Re-evaluation of the ages of 40Ar/39Ar sanidine standards and supereruptions in the western U...widely used Alder Creek (ACs) and Fish Canyon (FCs) sanidine standards. Several recent, independent, measurements...timescale. Notwithstanding, 40Ar/39Ar dating of sanidine using the 5- collector Noblesse can now provide...40Ar/39Ar mineral standards, the Alder Creek rhyolite sanidine (ACs; Turrin et al., 1994; Renne et al., 1998;...1998; Nomade et al., 2005) and the Fish Canyon Tuff sanidine (FCs; Renne et al., 1998; Kuiper et al., 2008; |  | | Journal (article/letter/editorial) | | fine-grained, composed of sanidine and quartz, and surrounded by a thin sanidine-quartz rind, and an alteration...and new, independent spherulites did not form. Sanidine crystals grew with a fibrous habit, which is favored...the crystallizing sanidine fibrils of the cones. The anhydrous nature of the sanidine and quartz suggests...1.83 m by Simons (1962) in a vitrophyric welded tuff from Klondyke, Arizona. Megaspheres occurring in...Mexico, developed in a matrix of a hot ash-flow tuff and have diameters ranging between 0.61 and 3.35 |  | | Journal (article/letter/editorial) | | to the west, 1 km beneath rhyolitic intracaldera tuff (Fig. 2; Yosifov et al., 1990). These observations...undertaken on separates of K feldspar, biotite, sanidine, plagioclase, alunite, and adularia from 12 rocks...hours. The neutron fluence monitor was 27.92 Ma sanidine from the Taylor Creek rhyolite (Duffield and Dalrymple...208, and S96-11), the extensive Borovitsa rhyolite tuff (Br97-3) from the edge of the caldera, and the high...~350° to 150°C (McDougall and Harrison, 1999). Sanidine from a high K latite gave an age of 32.72 ± 0 |  | Gleadow, Andrew, Harrison, Mark, Kohn, Barry, Lugo-Zazueta, Rául, Phillips, David (2015) The Fish Canyon Tuff: A new look at an old low-temperature thermochronology standard. Earth and Planetary Science Letters, 424. 95-108 doi:10.1016/j.epsl.2015.05.003 | Journal (article/letter/editorial) | | Letters www.elsevier.com/locate/epsl The Fish Canyon Tuff: A new look at an old low-temperature thermochronology...27 May 2015 Editor: A. Yin Keywords: Fish Canyon Tuff geochronology thermochronology age standard (U–Th)/He...(U–Th)/He fission track a b s t r a c t The Fish Canyon Tuff (FCT) has served as an important source for geochronology...substantial post-eruptive Early Miocene cooling of the tuff consistent with its position at the bottom of a...thermal disturbance. One of the distal sites – a quarry in the upper part of the FCT – appears to be an |  | | Journal (article/letter/editorial) | | and makes up nearly half of one sample. A rhyolite tuff ncar Denver, Colorado, has been altered to halloysite...United States; and illite and halloysite from Hungary (Mattyasovscky-Zsolnay, 1946). In contrast, apparently...dominant alteration product of a partly altered tuff in lake beds of Miocene age in Idaho; and Martin-Vivaldi...concentrated at the bottom of the bentonite beds; sanidine is the only feldspar; quartz generally composes...hornblende, and zircon are present. Some of the sanidine and quartz crystals observed in thin sections |
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