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Book Hydrothermal Studies in Yellowstone National Park Wyoming

Download or read book Hydrothermal Studies in Yellowstone National Park Wyoming written by Keith E. Bargar and published by . This book was released on with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Hydrothermal Studies in Yellowstone National Park Wyoming

Download or read book Hydrothermal Studies in Yellowstone National Park Wyoming written by Terry E. C. Keith and published by . This book was released on 1978 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Hydrothermal Alteration and Self sealing in Y 7 and Y 8 Drill Holes in Northern Part of Upper Geyser Basin Yellowstone National Park Wyoming

Download or read book Hydrothermal Alteration and Self sealing in Y 7 and Y 8 Drill Holes in Northern Part of Upper Geyser Basin Yellowstone National Park Wyoming written by Terry E. C. Keith and published by . This book was released on 1978 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Hydrothermal Alteration and Self sealing in Y 7 and Y 8 Drill Holes in Northern Part of Upper Geyser Basin Yellowstone National Park Wyoming

Download or read book Hydrothermal Alteration and Self sealing in Y 7 and Y 8 Drill Holes in Northern Part of Upper Geyser Basin Yellowstone National Park Wyoming written by Terry E. C. Keith and published by . This book was released on 1978 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Hydrothermal Alteration in Core from Research Drill Hole Y 1 Upper Geyser Basin Yellowstone National Park Wyoming

Download or read book Hydrothermal Alteration in Core from Research Drill Hole Y 1 Upper Geyser Basin Yellowstone National Park Wyoming written by Setsuko Honda and published by . This book was released on 1970 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: Y-1 penetrated an active hot-spring system to 215 feet (65.5 m), where the temperature was 171 (degrees) C. The core is sinter to 12 feet (3.7 m), sandstone, conglomerate, and siltstone composed of rhyolite detritus to 211 feet (64.3 m), and bedrock rhyolite. Hydrothermal minerals replace obsidian and fill open spaces. Original plagioclase and alkali feldspar are unaltered. Clinoptilolite, mordenite, opal, and relic œ-cristobalite occur in the less altered core. In the more intensely altered core analcime is the sole zeolite, hydrothermal quartz is abundant, and œ-cristobalite has been converted to quartz. Montmorillonite and celadonite occur throughout most of the core: calcite, pyrite, muscovite, kaolinite, erionite, and aegirine are sporadic. Hydrothermal alkali feldspar occurs in only one sample. Associated hot-spring fluids are dilute, slightly alkaline, and contain mainly Na, Cl, HCO(3), and SiO(2). Major factors controlling formation of hydrothermal minerals in Y-1 are 1) nature of starting material, 2) elevated temperature, and 3) fluid composition. Parallel distribution patterns of zeolites and silica species suggest that variation in SiO(2) activity is important. Hydrothermal alteration in Y-1 has produced mineral assemblages similar to those produced during low-temperature diagenesis of sedimentary rocks rich in volcanic detritus.

Book Hydrothermal Alteration in Core from Research Drill Hole Y 2 Lower Geyser Basin Yellowstone National Park Wyoming

Download or read book Hydrothermal Alteration in Core from Research Drill Hole Y 2 Lower Geyser Basin Yellowstone National Park Wyoming written by Keith E. Bargar and published by . This book was released on 1981 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: Y-2, a U.S. Geological Survey research diamond-drill hole in Lower Geyser Basin, Yellowstone National Park, was drilled to a depth of 157.4 meters. The hole penetrated interbedded siliceous sinter and travertiae to 10.2 m, glacial sediments of the Pinedale Glaciation interlayered with pumiceous tufffrom 10.2 to 31.7 m, and rhyolitic lavas of the Elephant Back flow of the Central Plateau Member and the Mallard Lake Member of the Pleistocene Plateau Rhyolite from 31.7 to 157.4 m. Hydrothermal alteration is pervasive in most of the nearly continuous drill core. Rhyolitic glass has been extensively altered to clay and zeolite minerals (intermediate heulandite, clinoptilolite, mordenite, montmorillonite, mixed-layer illite- montmorillonite, and illite) in addition to quartz and adularia. Numerous veins, vugs, and fractures in the core contain these and other minerals: silica minerals (opal, B-cristobalite, a-cristobalite, and chalcedony), zeolites (analcime, wairakite, dachiardite, laumontite, and yugawaralite), carbonates (calcite and siderite), clay (kaolinite and chlorite), oxides (hematite, goethite, manganite, cryptomelane, pyrolusite, and groutite), and sulfldes (pyrrhotite and pyrite) along with minor aegirine, fluorite, truscottite, and portlandite(?). Interbedded travertine and siliceous sinter in the upper part of the drill core indicate that two distinct types of thermal water are responsiblef or precipitation of the surficial deposits, and further that the water regime has alternated between the two thermal waters more than once since the end of the Pinedale Glaciation (-10,000 years B.P.). Alternation of zones of calcium-rich and sodium- and potassium-richh ydrothermal minerals also suggeststh at the water chemistry in this drill hole varies with depth.

Book The Objectives for Deep Scientific Drilling in Yellowstone National Park

Download or read book The Objectives for Deep Scientific Drilling in Yellowstone National Park written by and published by National Academies. This book was released on 1987 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Distribution of Buried Hydrothermal Alteration Deduced from High resolution Magnetic Surveys in Yellowstone National Park

Download or read book Distribution of Buried Hydrothermal Alteration Deduced from High resolution Magnetic Surveys in Yellowstone National Park written by Claire Bouligand and published by . This book was released on 2014 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Yellowstone National Park (YNP) displays numerous and extensive hydrothermal features. Although hydrothermal alteration in YNP has been extensively studied, the volume, geometry, and type of rock alteration at depth remain poorly constrained. In this study, we use high-resolution airborne and ground magnetic surveys and measurements of remanent and induced magnetization of field and drill core samples to provide constraints on the geometry of hydrothermal alteration within the subsurface of three thermal areas in YNP (Firehole River, Smoke Jumper Hot Springs, and Norris Geyser Basin). We observe that hydrothermal zones from both liquid- and vapor-dominated systems coincide with magnetic lows observed in aeromagnetic surveys and with a decrease of the amplitude of short-wavelength anomalies seen in ground magnetic surveys. This suggests a strong demagnetization of both the shallow and deep substratum within these areas associated with the removal of magnetic minerals by hydrothermal alteration processes. Such demagnetization is confirmed by measurements of rock samples from hydrothermal areas which display significantly decreased total magnetization. A pronounced negative anomaly is observed over the Lone Star Geyser and suggests a significant demagnetization of the substratum associated with areas displaying large-scale fluid flow. The ground and airborne magnetic surveys are used to evaluate the distribution of magnetization in the subsurface. This study shows that significant demagnetization occurs over a thickness of at least a few hundred meters in hydrothermal areas at YNP and that the maximum degree or maximum thickness of demagnetization correlates closely with the location of hydrothermal activity and mapped alteration.