Download or read book Stable Isotope C O H Major and Trace Element Studies on Hydrothermal Alteration and Related Ore Mineralization in the Volcano sedimentary Belt of Bergslagen Sweden written by Pier Anne de Groot and published by Faculteit Aardwetenschappen Der Rijksuniversiteit Te Utrecht. This book was released on 1993 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stable Isotope C O H Major and Trace Element Studies on Hydrothermal Alteration and Related Ore Mineralization in the Volcano sedimentary Belt of Bergslagen Sweden written by Filippus Paulus Neele and published by . This book was released on 1992 with total page 181 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Isotopic and Trace Element Characteristics of Rhyolites from the Valles Caldera New Mexico Final Technical Report written by and published by . This book was released on 1991 with total page 113 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report is a summary of work supported by DOE grant No. DE-FGO5-87ER13795 that was completed or is still in progress. The stated purpose of this grant was to collect geochemical information (trace element, radiogenic isotope and stable oxygen and hydrogen isotope) on samples from core holes VC-I and VC-2a in the Valles caldera in order to establish a consistent detailed intracaldera stratigraphy and relate this to extracaldera volcanic rock units of the Jemez Mountains. Careful stratigraphic control of the intracaldera units is necessary to evaluate models of caldera formation, ignimbrite deposition, and resurgence. Combined stable and radiogenic isotope and trace element data will also provide major insights to petrogenesis of the Bandelier magma system. The composition of non-hydrothermally altered samples from outflow units of the Bandelier Tuff and related volcanics must be known to assess isotopic variations of intracaldera ignimbrite samples. On detailed examination of the VC-2a core samples, it became apparent that hydrothermal alteration is so extensive that no geochemical information useful for stratigraphic fingerprinting or petrogenesis could be obtained, and that correlation with other intracaldera units and extracaldera units must be made on the basis of stratigraphic position and gross lithologic characteristics. Accordingly, we emphasize geochemical data from the extracaldera Bandelier Tuffs and related units which will be useful for comparison with proposed drill hole VC-4 and for any future studies of the region. The stable isotope, radiogenic isotope and trace element data obtained from this project, combined with existing major and trace element data for volcanic rocks from this area, provide an extensive data base essential to future Continental Scientific Drilling Program projects in the Jemez Mountains of New Mexico.
Download or read book Stable Isotope Studies of Some Active Hydrothermal Systems written by Steven J. Lambert and published by . This book was released on 1976 with total page 792 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stable Isotope Investigation of a Hydrothermal Alteration System written by Lihua Zhang and published by . This book was released on 2000 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt: Typical porphyry-type Cu-Mo mineralization predates and underlies the well-known Main Stage polymetallic veins of the Butte district, Montana. This thesis presents the first systematic study of the isotopic characteristics of the pre-Main Stage K-silicate and sericitic wallrock alteration related to the porphyry Cu-Mo stage. Oxygen and hydrogen isotopic compositions were obtained from hydrous and other silicate minerals of sixty-two samples from the unaltered host rock and ores: four Butte Quartz Monzonite; seven samples from K-silicate alteration; twenty samples of K-silicate alteration affected by late argillic alteration; and twenty-seven samples of gray-sericite alteration. These data support current porphyry Cu-Mo models that the associated hydrothermal fluids that produced pre-Main Stage K-silicate and gray sericite were dominantly magmatic in origin. Butte differs from other porphyry Cu-Mo districts because the widespread Main Stage or younger argillic alteration dominated by meteoric water ([delta]D = -100 to -120%) has partly to totally reset the hydrogen isotopic compositions of hornblende (D = -45 to -l26%) and biotite ([delta]D -61 to -l35%) in the fresh Butte Quartz Monzonite host rock, biotite (D = -47 to -131%o) of the early high temperature K-silicate alteration assemblages, and locally reset the [delta]D values ( -25 to -1 l7%o) of sericite (muscovite) of gray-sericite alteration assemblages. The effect of argillic alteration on these minerals was to produce D-depleted isotopic composition ([delta]D = -80 to -140%). Sulfur isotope analyses have been applied to sulfides and anhydrite from forty-seven samples selected from deep drill cores. These include sulfate-sulfide assemblages in veinlets associated with K-silicate alteration selvages and slightly younger quartz-pyrite veinlets associated with gray-sericite alteration selvages. The K-silicate and gray-sericite sulfide values (34S = +0.4 to +4.7 %) presented here are similar to those of Main Stage sulfides reported previously and suggest a conventional "magmatic" value ([delta]345 about 2 %o) for Butte sulfide-sulfur in the hydrothermal fluid. However, the anhydrite from the K-silicate alteration yields a much heavier 634S value (+ 12.9 %o), therefore, total sulfur (& 4Szs %) of the early K-silicate assemblage was likely as heavy as 10 per mil, suggesting a possible crustal component to this relatively oxidized system.
Download or read book Emerging Stable Isotope Techniques in Hydrothermal Research written by John Arthur Mering and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stable Isotope Major and Trace Element Chemistry of Modern Snow from Evans Piedmont Glacier Antarctica written by Julia Ruth Bull and published by . This book was released on 2009 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stable Isotope and Trace Element Studies in Carbonate Diagenesis written by James D. Marshall and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Isotopic and Trace Element Study of the Woods Mountains Caldera Complex a Bimodal Basalt rhyolite Volcanic Center in the Eastern Mojave Desert written by Donald Stanley Musselwhite and published by . This book was released on 1984 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hydrothermal Alteration Characterization and Stabel Isotope Geochemistry as Vectors Towards Ore Near Stockton Utah written by Stephanie M. Murillo Maikut and published by . This book was released on 2008 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Isotope and Trace Element Patterns Below the Merensky Reef Bushveld Complex South Africa written by and published by . This book was released on 1991 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book STABLE ISOTOPE GEOCHEMISTRY OF THE CREEDE FORMATION AND IMPLICATIONS FOR THE ORIGIN OF FLUIDS RESPONSIBLE FOR HYDROTHERMAL VEIN MINERALS IN written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Major and Trace element and Strontium and Oxygen isotope Geochemistry of the Polvadera Group Jemez Volcanic Field New Mexico written by Bruce Marston Loeffler and published by . This book was released on 1984 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Isotopic and Mineralogical Studies of Sulfide Mineralization and Hydrothermal Alteration in the Duke Island Ultramafic Complex Southeastern Alaska written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Isotopic and mineralogical studies of sulfide mineralization and hydrothermal alteration in the Duke Island ultramafic complex, southeastern Alaska.
Download or read book Stable Isotope and Trace element Geochemistry of Vertebrate Fossils written by Bruce J. MacFadden and published by . This book was released on 1994 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Isotopic and Trace Element Investigations of Crustal Processes written by Heather Margaret Kirkpatrick and published by . This book was released on 2022 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: Knowledge of crustal architecture, and the distribution of rock types within, did not by itself provide geologists unambiguous evidence of its evolution. It was not until the advent of modern geochemical and petrologic methods in the 1960s that the mechanisms and timescales of continental crustal evolution began to be delimited. Chapter 1 of this thesis introduces the historical background of modern geological studies and places my three principal investigations in that broader context. These studies range from understanding interactions between climate, rock strength, topographic form, and erosion to unraveling the controls of magmatic processes which control trace element partitioning. Chapter 2 investigates how erosion rate, topography, and rock properties control the landform evolution in eastern Tibet. Tectonic deformation can influence spatiotemporal patterns of erosion by changing both base-level and the mechanical state of bedrock. Although base-level change and the resulting erosion are well understood, the impact of tectonic damage on bedrock erodibility has rarely been quantified. Eastern Tibet, a tectonically active region with diverse lithologies and multiple active fault zones, provides a suitable field site to understand how tectonic deformation controls erosion and topography. In this study, I quantified erosion coefficients using the relationship between millennial erosion rates and the corresponding channel steepness. This work shows a two-fold increase in erosion coefficients between basins within 15 km of major faults and those beyond 15 km, suggesting that tectonic deformation through seismic shaking and rock damage significantly affects eastern Tibet erosion and topography. It demonstrates a field-based, quantitative relationship between rock erodibility and fault damage, which has important implications for improving landscape evolution models. In Chapter 3, I investigate the influences of Zr stable isotope variations in samples from the Peninsular Ranges Batholith, southern California. Zr isotopic measurements were undertaken on zircon, titanite, biotite, amphibole, and whole rocks from the La Posta pluton together with trace element analyses and U-Pb ages to understand the controls on Zr isotope fractionation in igneous rocks, including temperature, co-crystallizing phases, and kinetic effects. Middle rare earth element (MREE) depletions are present that could indicate that a co- or formerly crystallizing phase impacted the subsequent Zr isotope composition of zircon. Large (>0.6 0 Zr isotope fractionations (expressed as [delta]94/90Zr) were found between titanite and zircon forming at approximately the same temperature. Using equilibrium fractionation factors calculated from ionic and ab initio models, we inferred the controls on Zr isotope evolution to include crystallization order, with titanite fractionation resulting in isotopically lighter melt and zircon fractionation resulting in isotopically heavier melt. While these models of Zr fractionation can explain [delta]94/90Zr variations of up to ~1.50 crystallization order, temperature and presence of co-crystallizing phases do not explain all aspects of the intracrystalline Zr isotopic distribution in zircons in the La Posta pluton. Without additional constraints, Zr stable isotopic investigations of zircons are not yet unambiguous proxies of magmatic evolution. While the Ti-in-Quartz thermobarometer is one of the most widely used trace element methods in the geosciences to simultaneously obtain temperature and pressure information, recent studies have called its accuracy into question. In Chapter 4, I present six new experimental results and review the critiques of this thermobarometer. With regard to the latter, the effects of secondary fluorescence, supersaturation, and quenching rates appear to provide first order explanations for the differences in the varied results. My results broadly agree with the earlier calibrations but further experimental and modeling of the many controls on Ti concentrations in quartz appear warranted.
Download or read book The Isotope Trace Element and Major Element Geochemistry of the Mesozoic Appalachian Tholeiite Province written by William Joseph Pegram and published by . This book was released on 1986 with total page 1250 pages. Available in PDF, EPUB and Kindle. Book excerpt:
