 | Scott, Robert B., Harding, Anne E., Swadley, W.C., Novak, Steven W., Pampeyan, Earl H. (1991) Preliminary geologic map of the Vigo NW Quadrangle, Lincoln County, Nevada. Open-File Report Vol. 1991 (91-389) US Geological Survey doi:10.3133/ofr91389 | Report (issue) | | GEOLOGIC MAP OF THE VIGO NW QUADRANGLE, LINCOLN COUNTY, NEVADA By Robert B. Scott \ Anne E. Harding 2...Youngest rhyolite flows (Miocene)--Medium-light-gray to light-gray, massive to flow-banded rhyolite containing...cooling breaks. The K-Ar sanidine date for the rhyolite is 13.3+0.4 Ma (Novak, 1984). Erosional remnants...biotite rhyolite vent (Miocene) Pinkish-gray to pale-yellowish-brown, frothy, vitric rhyolite containing... and biotite. Distinguished from late biotite rhyolite (Tlrb) by uniformly high-angle attitudes of flow-foliation |  | | Journal (article/letter/editorial) | | .............................................. Dikes and sills............................................................................. Potassic rhyolite................................................................................. Sodipotassic rhyolite.................................................IGNEOUS ROCKS OF TERLINGUA-SOLITARIO REGION Soda rhyolite..................................................................... Solitario and paisanitic rhyolite.............................................. |  | | Journal (article/letter/editorial) | | Abstract The northern Shoshone and Toiyabe Ranges in north-central Nevada expose numerous areas of mineralized... &M Introduction Carlin-type gold deposits in north-central Nevada (Fig. 1) are presently one of the...Compaction foliation in tuff 19 Eocene plutons and dikes s ee le y Roberts Mountains thrust 12 Miocene...Paleozoic rocks in the caldera wall. West-dipping, north-striking normal faults cut the caldera margin, and...possibility that these normal faults may extend north into the Shoshone Range. This study was undertaken |  | | Report (volume) | | Paradise Range and Northern Pactolus Hills, Nye County, Nevada U.S. GEOLOGICAL SURVEY BULLETIN 1974 ...Paradise Range and Northern Pactolus Hi lis, Nye County, Nevada By DAVID A. JOHN U.S. GEOLOGICAL SURVEY...Paradise Range and Northern Pactolus hills, Nye County, Nevada I by David A. john. p. em. -(U.S. Geological...references. 1. Volcanic ash, tuff, etc.-Nevada-Nye County. 2. Geology, Stratigraphic-Oligocene. 3. Geology...Geology, Stratigraphic-Miocene. 4. Geology-Nevada-Nye County. f. Title. If. Series. QE75.B9 no. 1974 557.3 s-dc20 |  | Cunningham, C. G., Ludwig, K. R., Naeser, C. W., Weiland, E. K., Mehnert, H. H., Steven, T. A., Rasmussen, J. D. (1982) Geochronology of hydrothermal uranium deposits and associated igneous rocks in the eastern source area of the Mount Belknap Volcanics, Marysvale, Utah. Economic Geology, 77 (2) 453-463 doi:10.2113/gsecongeo.77.2.453 | Journal (article/letter/editorial) | | eruptionof the Red Hills Tuff Member, and emplacementof dikes,all consisting of the Mount BelknapVolcanics, finally...depositswere The Centralmining area is located5.6 km north- summarizedin severalpublications(Kerr et al., 1957;...eruptedbetween$5 and 22 m.y. ago and a younger bimodal rhyolite-basaltassemblageerupted from about21 m.y. agoto...change from calc-alkalinevolcanismto bimodalalkali rhyolite-basaltvolcanismtookplacenear Marysvaleabout22...Central miningarea,mostof the rocksof the alkali-rhyolite end memberbelongto the Mount BelknapVolcanics |  | | Report (volume) | | and Coyote Mountains Wilderness Study Areas, Pima County, Arizona ARIZONA Chapter E Mineral Resources...Coyote Mountains Wilderness Study Areas, · Pima County, Arizona By GARY A. NOWLAN, GORDON B. HAXEL, ....and Coyote Mountains Wilderness Study Areas, Pima County, Arizona I by Gary A. Nowlan ... [et al.]. p. em...Mountains (AZ-020-202) Wilderness Study Areas, Pima County, Arizona. CONTENTS Summary El Abstract El Character...and Coyote Mountains Wilderness Study Areas, Pima County, Arizona E2 Map showing mineral resource potential |  | | Report (issue) | | Fork-Jerry Peak area............. 18 Area west and north of Stanley and White Cloud Peak area.... 24 Granitic...INTRUSIVE MASSES For description see Yellowjacket area RHYOLITE INTRUSIVE MASSES For description see Yellowjacket...see description for Yellowjacket area SUNNYSIDE RHYOLITE TUFFS AND RELATED ROCKS Upper Sunnyside Tuff Red...red-brown weathering, densely welded, devitrified rhyolite tuff; multiple-flow compound cooling unit that...Reddish-gray, simple cooling unit of densely welded rhyolite tuff. Distinguished from Tsu by more abundant |  | | Report (issue) | | dikes________________________________________ Dikes of Paleozoic and Mesozoic age_____________________...related rocks------------------------Sodic rhyolite porphyry, rhyolite, and sodic andesite porphyrY--------..._____ -----___ North contact of pluton west of Twelvemile Arm__________ Prospect on north branch of Paul...Paul Young Creek_ _ _ _ _______ Prospects on North Pole HilL--------------------------Other areas of i...Conglomeratic volcanic graywacke or tuff on the north shore of the entrance to Thorne Bay_ Facing 316 |  | | Journal (issue) | | Most ash-flow tuffs are rhyolite or dacite; a few are peralkaline soda rhyolite. Older ash-flow tuffs are...laminated rock similar in some ways to flow-banded rhyolite, by crystallization of the glassy constituents...Oregon, as well as elsewhere, were interpreted as rhyolite or dacite with unusual textures that originated...that the formation contains a widespread, massive rhyolite flow with tuffaceous phases. Fuller (1931), in...Pliocene Rattlesnake Formation contains a "pumiceous rhyolite flow," now recognized as a welded tuff. The foregoing |  | | Report (volume) | | tuff member _ Porphyritic lava flows Gray Hills Rhyolite Member _ Upper gray tuff member __ _ Intracaldera...Blue Lake Rhyolite Member Middle tuff member ________ ________________ _ Mount Baldy Rhyolite Member and...Canyon volcanic pile. About 21 m.y. ago, alkali rhyolite of the Mount Belknap Volcanics became dominant...was filled to overflowing with ash-flow tuffs, rhyolite lava flows, and volcanic breccias. Small-volume...caldera is a smaller coeval structure located 5 km north of Marysvale in the southern Antelope Range. Intracaldera |  | | Journal (volume) | | Mountain caldera, Ochoco National Forest, Crook County, Oregon 25 Field trip guide to the Oligocene Crooked...Crooked Basin and the ancestral Crooked River, Crook County, Oregon 73 Portland, Oregon, geology by tram, train...Baker City field office is relocating to the Baker County Court House. We have also moved the Nature of the...are the Oregon Lidar Consortium and the FEMA Coos County Multi-hazards Mapping Program. Both programs underscore...oregongeology.org Baker City Field Office: Baker County Courthouse, 1995 3rd Street, Baker City, Oregon |  | | Report (issue) | | 294-1 With collaboration by Aaron C. Waters on the North La Sal stock and the origin and evolution of the...intrusive structures__________________ Intrusions on North Mountain..-..__...___ Diorite porphyry laccoliths...and intrusive structures—Continued Intrusions on North Mountain—Continued Diorite porphyry laccoliths and...Creek sill_______ ______—— Other dikes and sills.______________ — __ North La Sal stock, by Charles B. Hunt...complex___-_-______-__---_Feldspathoidal and other soda-rich dikes— Soda syenite porphyry——————— ———— Explosion breccias |  | | Report (issue) | | tuff member : Porphyritic lava flows Gray Hills Rhyolite Member Upper gray tuff member INTRACALDERA FACIES...tuff member Blue Lake Rhyolite Member Middle tuff member Mount Baldy Rhyolite Member and volcanic breccia...Canyon volcanic pile. About 21 m.y. ago, alkali rhyolite of the Mount Belknap Volcanics became dominant...was filled to overflowing with ash-flow tuffs, rhyolite lava flows, and volcanic breccias. Small-volume...structure located in the southern Antelope Range 5 km north of Marysvale'. Intracaldera and outflow facies volcanic |  | | Report (issue) | | ----------------- 15 The Geography of Dona Ana County--------------------------------------------- 18...mineralization ----------------------------- 33 Epidiorite dikes --------------------------------------------------------...-------------------------------------------------Cueva rhyolite -------------------------------------------------------Field...----------------------------------------------Soledad rhyolite --------------------------------------------------Field...intrusives—Continued Quartz-feldspar porphyry sills and dikes ------------------- 84 Field relations -------- |  | | Journal (article/letter/editorial) | | com/loi/tigr20 Origin of the Felsic and Basaltic Dikes and Flows in the Rajula-Palitana-Sihor Area of the...Bhattacharji (2001) Origin of the Felsic and Basaltic Dikes and Flows in the Rajula-Palitana-Sihor Area of the...rights reserved. Origin of the Felsic and Basaltic Dikes and Flows in the Rajula-Palitana-Sihor Area of the...Abstract Rhyolite, trachyte, pitchstone, and granophyre dikes are associated with mafic dolerite dikes and...province in the Saurashtra Peninsula, India. Felsic dikes, exposed in the Rajula area of Saurashtra, are similar |  | Bogatikov, O. A., Gurbanov, A. G., Kovalenko, V. I., Koronovskiy, N. V., Lipman, P., Tsvetkov, A. A. (1992) THE UPPER CHEGEM CALDERA COMPLEX IN THE NORTH CAUCASUS. International Geology Review, 34 (2) 131-147 doi:10.1080/00206819209465589 | Journal (article/letter/editorial) | | com/loi/tigr20 THE UPPER CHEGEM CALDERA COMPLEX IN THE NORTH CAUCASUS O. A. Bogatikov V. Koronovskiy a b c ...(1992) THE UPPER CHEGEM CALDERA COMPLEX IN THE NORTH CAUCASUS, International Geology Review, 34:2, 131-147...ions THE UPPER CHEGEM CALDERA COMPLEX IN THE NORTH CAUCASUS 0. A. Bogatikov, A. G. Gurbanov, V. I....the basins of the Chegem and Baksan rivers in the North Caucasus are interpreted as parts of a single magmatic...During joint Soviet-American field work in the North Caucasus in 1989-1991, undertaken as part of the |  | | Report (issue) | | of a Portion , of the Silver City Region Owyhee County, Idaho .1 R. R. Q r; o .... o ... Co:) Q ...OF A PORTION OF THE SILVER CITY REGION, OWYHEE COUNTY, IDAHO by R. R. Asher \ Idaho Bureau of Mines...Varieties . . . • Porphyritic Diorite and Dacite Dikes . . . . . Outcrop Areas. . . . . . . . . . Rock.... . Source . . . . . . . . . Domes and Silicic Dikes. Dike s. . . . . • . . Volcanic Dome s . . . . Tuffaceous...Trending Northeast . . . . . Fractures Trending North to Northwest High Angle Fractures Trending N75W |  | | Report (issue) | | 18 Granitic group 24 Migmatite group 25 Diabase dikes 26 Metamorphism 27 MISSISSIPPIAN 28 Espiritu Santo...64 67 67 69 71 71 72 73 74 74 74 75 77 78 78 Rhyolite group INTRUSIVE SERIES Hornblende granite Augite... contain thin clastics, andesite, latite, and rhyolite. Intrusives include Eocene (51 m.y.) Rio Hondo...the Costilla and Latir Peak quadrangles to the north, and the Questa quadrangle to the west (1957); Smith...Cimarron Range. All these features are aligned north-south (fig. 1 and pl. 1). The area may be approached |  | | Report (issue) | | Geological Survey editorial standards or with the North American Stratigraphic Code. Any use of trade, product...THE GREAT BASIN: A BRIEF SYNOPSIS Volcanism began north of what is now the Great Basin in the Paleocene...magma erupted was high-K andesite, dacite, and rhyolite as lava flows and minor pyroclastic material....CALDERA COMPLEX Age (Ma) Dacite tuff crystal-rich Rhyolite tuff crystal-poor 27± Isom Formation* Present...CALDERA COMPLEX..MARYSVALE 1SANJUAN COLORADO , | RHYOLITE-DACITE I__I ASH-FLOW TUFFS ANDESITIC LAVA AND |  | | Report (issue) | | _ Analcite-free rocks _____________________ _ Rhyolite ______ ____________________ _ Quartz soda syenite...Brewster County. The district is connected by graded road with the nearest railroad, 84 miles north of its...in the form of dikes, sills, laccoliths, and plugs and range in composition from rhyolite to basalt. Many...eastward from eastern Presidio County into southwestern Brewster County (fig. 1). Quicksilver minerals...approaches the Terlingua quicksilver district from the north. Stretching southward from Alpine is a broad upland |  | | Report (issue) | | Nellis Air Force Base Bombing and Gunnery Range, Nye County, Nevada GEOLOGICAL SURVEY PROFESSIONAL Prepared...Nellis Air Force Base Bombing and Gunnery Range, Nye County, Nevada By E. B. EKREN, R. E. ANDERSON, C. L. ROGERS...Range_ __________________________________ Tuff and rhyolite of Gold Flat________________ Tuff of White Blotch...core of the Cactus Range.____._____________----Rhyolite of White Ridge and tuffaceous rocks_ _____-_-...----Rhyolite of O'Briens Knob --------------Rhvolite of Cactus Peak___-__--------------Rhyolite of Belted |  | | Report (volume) | | Host Rocks, Sleeper Gold-Silver Deposit, Humboldt County, Nevada Geology and Geochemistry of Tertiary...Host Rocks, Sleeper Gold-Silver Deposit, Humboldt County, Nevada By J. Thomas Nash, William C. Utterback...host rocks, Sleeper gold-silver deposit, Humboldt County, Nevada I by J. Thomas Nash, William C. Utterback...ores-Geology-Nevada-Humboldt County. 2. Silver ores-GeologyNevada-Humboldt County. 3. Geology, Stratigraphic-Tertiary...Stratigraphic-Tertiary. 4. GeologyNevada-Humboldt County. I. Utterback, W.C. II. Trudel, Wayne S. III. Title. IV |  | | Report (issue) | | Igneous rocks __________________________________ Rhyolite dikes__________________________ Quartz latite...latite dikes____-___-'----_--________._ Latite dikes._______________________________ Andesite dikes_______...________________________ Potrero rhyolite porphyry______________ Rhyolite f elsite.________________________...Igneous rocks of the Carrizal mining area__________ Rhyolite dikes____________________________ Quartz latite...Pyroxene-amphibole vogesite dikes____________ Dacite dikes _______________________________ Andesite dike._ |  | | Report (volume) | | Mountains of Wyoming. It extends southeast 115 mi from north of Sundance, Wyo., to south of Hot Springs, S. Dak...Springs, to 7,242 ft at the top of Harney Peak, north of Custer. The rocks in the Forest range from those...Custer. The search for more gold led prospectors north from Custer to find other placer deposits in the...Irregularly shaped, it extends for 115 mi from north to south, averaging about 25-30 mi in width in South...Rapid Creek on the east and Spearfish Creek on the north. Local relief is generally not more than 1,500 ft |  | | Report (issue) | | ......................... Aplite and pegmatite dikes........................................................................................ Tertiary dikes...................................................quadrangle. These six terranes are all crosscut by north- and northwest-striking high-angle faults. The alluvial...quadrangle (fig. 1; pi. 1) is in central Idaho north of the Snake River Plain. The largest community... fracture systems, dike swarms, and grabens; a north- and northwest-striking system of high-angle faults; |
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