 | | Report (issue) | | Mountains, about 20 air miles southwest of Salt Lake City, Utah. Igneous rocks of the district, broadly...level. B, photomicrograph of sample in A (or, orthoclase; pc, plagioclase; aug, augite; bi, biotite)....of about 0.4-0.6 mm. Untwinned cryptoperthitic orthoclase (Or72_75, bulk composition for seven samples...crystals with average diameter of 0.2-0.5 mm; the orthoclase is commonly clouded by dark submicroscopic inclusions...stock. Plagioclase ranges from 26 to 45 percent, orthoclase from 13 to 39 percent and quartz from 3 to 11 |  | | Report (volume) | | rocks____________________ Cambrian_______________________Siebert lake beds ___________________._ Travertine _.________________________... Rhyolites and dacites_________________ Later rhyolite _ ____ _ _ _ _ _ Basalt _.____ _______________________________...Cambrian ______________________ 66 66 66 Siebert lake beds.__________.___.____ Igneous rocks_______________________...67 Diorite porphyry _____________________ 67 Rhyolite _._________________________ 67 Basalt _____...Sedimentary rocks ___________ '.__________ Siebert lake beds__-_-_____________ Later tuffs ____________ |  | | Report (issue) | | 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...country rock (fig. 10). Usually, however, the outcrop is marked by residual fragments of white fluorspar...with fragments of country rock. Fluorspar at the outcrop is always white, as sunlight bleaches the color...deposits. Such occurrences should be traced to the outcrop as any other float mineral would be. ORIGIN OF |  | | Book (volume) | | Cave Park boundary), on N side of rd. a few yds., outcropRose Quartz. DOUGLAS COUNTY CORSICA, S on US 281...COUNTY JELLICO, regional rd. cuts along US 25W to La Folletteagate, chalcedony, jasper, etc. CANNON...Pyrolusite. CLAIBORNE COUNTY AREA, Lead mine on Lake NorrisGalena, Hydrozincite (fluorescent), Sphalerite...etc.) chert, crystals, fossils; Davy Crockett Lake, area minesMica, etc. GREENEVILLE: area minesSphalerite;...minesSphalerite; 12 mi. distant, veins in dolomite outcropBarite crystals. MOSHEIM: jct. of US 11E and |  | | 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...Skomer Arenig Volcanic S e r i e s, incl11ding rhyolite, trachyte, kerato phyre, mugearite, basalt, dolerite...be grouped under the names £elsite, spherulitic rhyolite, and breccia. The Johnston Series comp1�ises quartz-diorites...these zone-£orms l1as yet been round. .Li\.s the outcrop is bou11ded by faults, th.e :connexion with tl1e...exceptions, namely, two small lenticles (noticed by De la Beche) wedged in the fault in the cliff at Talbennv |  | | Journal (article/letter/editorial) | | +5.2) and crustal Ce/Pb, Nb/U, Rb/Sr, and ro Th/La ratios (0.59–13.1, 3.3–20.9, 0.05–0.68, and 0.11–0...these elements (e.g., elevated La/Sm, La/Ta, Rb/Sr, and Jo ur Th/La, and depressed Ce/Pb, Nb/U, and...orthopyroxene (35–50 vol. %), diopside (10–30 vol. %), orthoclase (10–20 vol. %), plagioclase (10–20 vol. %), biotite...hornblendite consists of amphibole (ca. 90 vol. %), orthoclase (3–8 vol. %), plagioclase (2–5 vol. %), and minor...crustal geochemical signatures (e.g., Ce/Pb, La/Sm, and Th/La) of the enriched early Paleozoic mafic rocks |  | | Report (issue) | | ............................... . Granite and rhyolite ................................ . Economic materials...showing normative feldspar mineralogy of granite and rhyolite samples . . . . . . . . . . . . . . . . . . ....Missouri. Rock units sampled were granite and rhyolite of Precambrian age; shale, dolomite, sandstone...general, these units are readily distinguished in outcrop as they are stratigraphically bounded by major...general cannot be traced very far across the area of outcrop. Detailed Paleozoic nomenclature in the Illinois |  | | 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 |  | | Report (issue) | | Contact metamorphism _____________ _ Intrusive rhyolite porphyry _________________ _ Distribution and...Lithology _____________________________ _ Mica rhyolite _______________ - _-- _---------Johnny Lyon granodiorite...Conglomerate member_______________ Rhyolite member___________________ Rhyolite dikes______________________________...Stratigraphy___________________________ Older alluvium and lake deposits_____ Pediment gravels___________________...---------------------------Photomicrograph of rhyolite porphyrY------------------------------------- |  | | Report (issue) | | and Aonach Dubh : Glen Coe " Sisters ". Largely Rhyolite Lavas. B.636 . . 133 PLATE Vil. Meeting of Three...Coire Gabhail. B.641 139 PLAT E vnr. Stob Dearg. Rhyolite Lavas (crags) on Schists (grass covered). B.649... Upper Glen Coe hangs to Lower Glen Coe where rhyolite lava crosses the glen two miles upstream from...built up of tiers of andesite flows, capped by rhyolite and agglom erate, at once attracts attention...Three Sisters of Glen Coe, arc largely composed of rhyolite, with a peculiarly grand and massive type of scenery |  | | Book (volume) | | fossils. GREEN (or Strontian) ISLAND, Put-in-Bay, Lake Eire, as fine crystals and large masses filling...an uninteresting, drab rind of chocolate brown rhyolite or silicified volcanic tuff, nearly always knobby...siliceous volcanic rocks and are found abundantly in rhyolite flows and welded tuffs in a broad zone north and...charged⎯ thundereggs; d E 5 mi. on US 26, Ochoco Lake shores above the dam, area⎯Ochoco jasper; e E 6...14.2 mi. to the reservoir, on E side of rd. along lake and on surfaces of surrounding hills⎯agate (black |  | | Journal (article/letter/editorial) | | mine town site, (2) copper crystals recovered from Lake Superior at the Gull Rock fissure vein, (3) hundreds...the occurrence of yellow datolite at the bottom of Lake Superior. Many mineral-collectors-tumedscubadivers...five divers who were scouring the bottom of the lake for datolite nodules and agates-it resembled a frogmen...success in locating and recovering datolite from the lake bottom. To date, he has discovered two areas between...zone along the vein was 20-180 yards out into the lake. The color of most of the datolite from this vein |  | | Report (volume) | | 57-114) ................................... Granite-rhyolite family (Nos. 58-69).............................18 20 24 VI. High part of South Manitou Island, Lake Michigan, showing forest formerly huried beneath...Park; figs. 1-7. XXVII. Branching crystals of orthoclase, Manebacher twins, from Yellowstone National...346 XLIV. Thin sections of aporhyolite: A, from Lake Superior, Minnesota, showing perlitic structure;...granophyric, graphic. In granite, quartz-porphyry, and rhyolite, quartz and feldspar sometimes intercrystallize |  | | Report (volume) | | rock unit in the study area. Basalt overlies the rhyolite and forms low, rounded buttes that are probably...In the middle part of the area, the basalt and rhyolite are separated stratigraphically by a thin wedge...Au, B, Ba, Be, Bi, Ca, Cd, Co, Cr, Cu, Fe, Ga, K, La, Li, Mg, Mn, Mo, Na, Nb, Ni, P, Pb, Pd, Pt, Sb, Sc... The phenocrysts are mostly alkali feldspar (orthoclase, anorthoclase, sanidme) and plagioclase (An30...and yellow welded tuff breccia, and gray massive rhyolite. Minimum thickness of the Swisher Mountain Tuff |  | | Book (volume) | | fossils. GREEN (or Strontian) ISLAND, Put-in-Bay, Lake Eire, as fine crystals and large masses filling...an uninteresting, drab rind of chocolate brown rhyolite or silicified volcanic tuff, nearly always knobby...siliceous volcanic rocks and are found abundantly in rhyolite flows and welded tuffs in a broad zone north and...charged⎯ thundereggs; d E 5 mi. on US 26, Ochoco Lake shores above the dam, area⎯Ochoco jasper; e E 6...14.2 mi. to the reservoir, on E side of rd. along lake and on surfaces of surrounding hills⎯agate (black |  | | Book | | Quaternary (Drift} Mark ground and workt'd grnund , La ndslip. Peal. All uvium, Alluvial f'an dt'posits...w1c<111/im11it) - - - - - - - - - - - - - - - - - - La te Car boniferous ? Early rmtdsron c-. lnrcrlic-ddcd...Littlehan1 !Vludstone 84 Northern area 85 C lvst St La,,vrence Fo rrnation 85 , Aylesbeare Mudstone Group...Sandstone aeolian dune and interdune deposit.~ at Lake Bridge, Bran1pford Speke 51 (c) Aeolian cross-bedding...there for accurate up to date geological rnaps to aid la nd use planning and to identify bulk mineral resources |  | | Report (volume) | | deposits in Bossier, addo, and Webster pari hes, La., by E. F. Burchard (published 0 t. 22, 1915). ___...Clark ounty, N v.. Contorted flow structure in the rhyolite of, uck r an yon, Qr g. . Prospe tat th Abbie... . . Map of Bossier, addo, and W b ter parishes, La., showin<> approximat location of limonite deposits...Jenn, a station on the an Pedro, Los Ano- 1 e alt Lake Rail road. Good pring. lies on tb ea t sid of a...pann ing shows that the metals nrc in the free s la te.t. being apparently alloys of gold and platinum |  | | Report (issue) | | Center, Rm. 1C402,12201 Sunrise Valley Dr. SALT LAKE CITY, Utah-Federal Bldg., Rm. 8105,125 South State...Plagioclase feldspar phenocrysts weathering from rhyolite outcrop ----------------------4. Potassium feldspar...feldspar phenocryst and pyroxenes weathering from rhyolite outcrop ---------------5. Intergrowth of plagioclase...weathering to kaolinite and iron oxide in rhyolite- ----6. Rhyolite showing weathering of plagioclase crystals...kaolinite from rhyolite outcrop -----------------------8. Secondary alteration of rhyolite- ----------- |  | Danišík, Martin, Pfaff, Katharina, Evans, Noreen J., Manoloukos, Christos, Staude, Sebastian, McDonald, Brad J., Markl, Gregor (2010) Tectonothermal history of the Schwarzwald Ore District (Germany): An apatite triple dating approach. Chemical Geology, 278 (1) 58-69 doi:10.1016/j.chemgeo.2010.08.022 | Journal (article/letter/editorial) | | apatite-hosting rhyolite between 289.5 ± 4.5 Ma and 314 ± 6 Ma, which is the age of rhyolite-hosting granite...For this study, apatite was collected from a rhyolite outcrop within an adit of a former hydromuscovite...apatite precipitated in cavities and veins in the rhyolite (Fig. 2a,b,c; Sauer, 1894), forming up to ~ 3...colours are blue, turquoise, pink or brown. The rhyolite crosscuts and is thus younger than the (surrounding)...Photographs of the Ohlsbach rhyolite and its mineralization: (a) steep lamination of rhyolite parallel to the cooling |  | | Report (issue) | | west 0.3 km (.2 mi) past turnoff to Glen o. Jones Lake. 08:15 - 09:15 STOP 4, Horseshoe Quarry 09:15 -...ultramafic occurrences are most difficult to find in outcrop because of their extreme vulnerability to weathering...central portion of the dome, inside the encircling outcrop of New Albany Shale. One, the Pankey Breccia, is...a 60 cm (24-inch) wide dike, occurs within the outcrop of New Albany Shale on the south side of the dome...of mineralization at Hicks Dome is known from outcrop studies, trenching, and from a test well drilled |  | | Book | | Coal-bearing molasse -.... Flysch clastics at outcrop ~ Presumed extent of synorogenic clastics Proven...·Isles of Scilly is the small submarine granite outcrop of Haig Fras. This has affinities with the Cornubian...1987) Initial 87Sr/86Sr ratio Intrusive phase Outcrop and granite type Major Dartmoor (B) Bodmin Moor...'Series' is shown within the New Red Sandstone outcrop and younger Mesozoic rocks (diagonal ruling). 1...granite, but apparently lie outside the surface outcrop (Exley et at., 1982) and within the batholithic |  | | Book (volume) | | Grouse Mine shows copper sulphides and carbonates, Lake Cowichan. The mine dump is full of pyrite, chalcophyrite...Bonanza Lake Zeballos Sydney Inlet Muchalat Inlet Tlupana Inlet Tahsis Brooks Peninsula Benson Lake-Alice...Lake-Alice Lake Port Hardy area 103 San Josef Tips, Tricks and Trivia Some Favourite Sites Sites by Principal...would expect to find obsidian, basalt, and rhyolite. Rhyolite has pretty much the same chemistry as granite...does not allow crystals to form and grow. When rhyolite is blown by hot gases into a sponge texture, it |  | Stein, H.J., Bankey, Viki, Cunningham, C.G., Zimbelman, D.R., Brickey, D.W., Shubat, M.A., Campbell, D.L., , (1989) Tooele 1 x 2 Quadrangle, Northwest Utah; a CUSMAP preassessment study. Open-File Report Vol. 1989 (89-467) US Geological Survey doi:10.3133/ofr89467 | Report (issue) | | Geological and Mineral Survey 606 Black Hawk Way Salt Lake City, UT 84108-1280 TABLE OF CONTENTS Page PREFACE........... Silver Island Mountains and Great Salt Lake Desert Magnetic Anomalies.......................................................... FIGURES Figure la. Metalliferous areas of Utah.......................western Utah......................... Figure 3. Outcrop of igneous rocks in the Tooele 1° X 2° quadrangle...CITY OGDEN WYOMING VERNAL TOOELE SALT LAKE CITY Utah Lake GRAND DELTA PRICE JUNCTION O UTAH a |  | | Journal (issue) | | laths, and with quartz and, in more acid rocks, orthoclase, occurring in interstices between the plagioclase...km with the smaller plutons having a circular outcrop, and the larger ones being elongate. The range...in some rocks orthoclase perthite Cretaceous present in a few monzogranites orthoclase perthite commonly...pellets for trace elements. Analysis of the REE (La, Ce, Pr, Nd, Sm, Eu, Gd, Dy, Ho, Er, Yb, Lu) were...granite magma. The Castle an Dinas biotite granite outcrop lies within the metasomatic aureole associated |  | | Report (volume) | | light-olive-gray granite. Composed chiefly of quartz, orthoclase, microcline, and oligoclase. Occurs in small...zeolitized. Unconformably underlies Great Falls lake sands (new) ; unconformably overlies ~['wo Medicine...'l'rachyte plug and associated trachyte dike. Pioa rhyolite, Matafao, Papatele, Afono, and Vatia trachytes...cannot be definitely correlated with section near Lake Huron, and provisional names Afton beds, Marvin...correlation than is justified. Present in Black Lake-Afton area. Afton Limestone Member (of Wellington |
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