Selenium Isotope Paleobiogeochemistry
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| Author | : Eva E. Stüeken |
| Publisher | : Cambridge University Press |
| Total Pages | : 42 |
| Release | : 2020-10-08 |
| Genre | : Science |
| ISBN | : 1108804438 |
The attraction of selenium isotopes as a paleoenvironmental tracer lies in the high redox potential of selenium oxyanions (SeIV and SeVI), the dominant species in the modern ocean. The largest isotopic fractionations occur during oxyanion reduction, which makes selenium isotopes a sensitive proxy for the redox evolution of our planet. As a case study we review existing data from the Neoarchean and Paleoproterozoic, which show that significant isotopic fractionations are absent until 2.5 Ga, and prolonged isotopic deviations only appear around 2.3 Ga. Selenium isotopes have thus begun to reveal complex spatiotemporal redox patterns not reflected in other proxies.
| Author | : P.A. Trudinger |
| Publisher | : Elsevier |
| Total Pages | : 621 |
| Release | : 1979-01-01 |
| Genre | : Science |
| ISBN | : 0080874622 |
Biogeochemical Cycling of Mineral-Forming Elements
| Author | : Gary S. Banuelos |
| Publisher | : CRC Press |
| Total Pages | : 248 |
| Release | : 2013-11-29 |
| Genre | : Medical |
| ISBN | : 0203771419 |
Selenium is arguably the naturally occurring trace element of greatest concern worldwide. In excessive amounts it can lead to toxicosis and teratogenesis in animals, while the impact of selenium deficiency can be even more significant. Contributors from 22 countries explored the connections and inter-relationships between selenium in the environmen
| Author | : William M. White |
| Publisher | : John Wiley & Sons |
| Total Pages | : 724 |
| Release | : 2023-04-17 |
| Genre | : Science |
| ISBN | : 1119729939 |
Provides a thorough and up-to-date overview of radiogenic and stable isotope geochemistry Now in its second edition, Isotope Geochemistry presents a comprehensive introduction to radiogenic and stable isotope geochemistry. The book opens with an overview of the physics and origins of atoms and nuclei, followed by a review of radioactive decay schemes and geochronological techniques such as fission-track and carbon-14 dating. Subsequent chapters cover nucleosynthetic anomalies in meteorites, early solar system chronology, the theory and application of stable isotope geochemistry, isotopic variation in the noble gases, and more. This edition includes new sections on thermochronology, U-He dating, recently published La–Ce isotope data, stable isotopes in ore deposits, nuclear volume and nuclear spin effects, and the application of isotope geochemistry in areas such as agriculture, forensics, and environmental studies. Revised and expanded discussions address topics including isotope cosmochemistry, non-traditional isotopes, nucleosynthesis, advanced U-Pb dating and isotopic analysis technologies, the subcontinental lithosphere, and mass-independent isotope fractionation. Describes the use of radiogenic isotopes in understanding the evolution of the Earth’s mantle, crust, and oceans Explores the use of stable isotopes in areas such as mantle evolution, archeology, paleontology, ore formation, and paleoclimatology Reviews new developments in the understanding of nucleosynthesis, including insights gained from the study of the 2017 neutron star merger detected by gravitational waves Discusses progress in the field of unconventional isotopes, advances in isotope cosmochemistry, and recent data on regional variations in isotopic compositions Illustrated in full color throughout, Isotope Geochemistry, Second Edition is an excellent textbook for undergraduate and postgraduate students in all earth science disciplines.
| Author | : Kenneth W. W. Sims |
| Publisher | : John Wiley & Sons |
| Total Pages | : 356 |
| Release | : 2022-06-01 |
| Genre | : Science |
| ISBN | : 1119594979 |
Using isotopes as a tool for understanding Earth processes From establishing the absolute age of the Earth to providing a stronger understanding of the nexus between geology and life, the careful measurement and quantitative interpretation of minor variations in the isotopic composition of Earth’s materials has provided profound insight into the origins and workings of our planet. Isotopic Constraints on Earth System Processes presents examples of the application of numerous different isotope systems to address a wide range of topical problems in Earth system science. Volume highlights include: examination of the natural fractionation of non-traditional stable isotopes utilizing isotopes to understand the origin of magmas and evolution of volcanic systems application of isotopes to interrogate and understand Earth’s Carbon and Oxygen cycles examination of the geochemical and hydrologic processes that lead to isotopic fractionation application of isotopic reactive transport models to decipher hydrologic and biogeochemical processes The American Geophysical Union promotes discovery in Earth and space science for the benefit of humanity. Its publications disseminate scientific knowledge and provide resources for researchers, students, and professionals.
| Author | : F.T. Mackenzie |
| Publisher | : Elsevier |
| Total Pages | : 448 |
| Release | : 2005-11-22 |
| Genre | : Science |
| ISBN | : 0080525229 |
This volume covers the formation and biogeochemistry of a variety of important sediment types from their initial formation through their conversion (diagenesis) to sedimentary rocks. The volume deals with the chemical, mineralogical, and isotopic properties of sediments and sedimentary rocks and their use in interpreting the environment of formation and subsequent events in the history of sediments, and the nature of the ocean-atmosphere system through geological time. Reprinted individual volume from the acclaimed Treatise on Geochemistry, (10 Volume Set, ISBN 0-08-043751-6, published in 2003). - Comprehensive and authoritative scope and focus - Reviews from renowned scientists across a range of subjects, providing both overviews and new data, supplemented by extensive bibliographies - Extensive illustrations and examples from the field
| Author | : Kang-Jun Huang |
| Publisher | : Frontiers Media SA |
| Total Pages | : 142 |
| Release | : 2023-02-27 |
| Genre | : Science |
| ISBN | : 2832515339 |
| Author | : Clark M. Johnson |
| Publisher | : Walter de Gruyter GmbH & Co KG |
| Total Pages | : 472 |
| Release | : 2018-12-17 |
| Genre | : Science |
| ISBN | : 1501509365 |
The goal for Volume 55 of Reviews in Mineralogy and Geochemistry was to bring together a summary of the isotope geochemistry of non-traditional stable isotope systems as is known through 2003 for those elements that have been studied in some detail, and which have a variety of geochemical properties. In addition, recognizing that many of these elements are of interest to workers who are outside the traditional stable isotope fields, we felt it was important to include discussions on the broad isotopic variations that occur in the solar system, theoretical approaches to calculating isotopic fractionations, and the variety of analytical methods that are in use. We hope, therefore, that this volume proves to be useful to not only the isotope specialist, but to others who are interested in the contributions that these non-traditional stable isotopes may make toward understanding geochemical and biological cycles. The review chapters in this volume were the basis for a two-day short course on nontraditional stable isotopes held prior (May 15-16, 2004) to the spring AGU/CGU Meeting in Montreal, Canada.
| Author | : Jochen Hoefs |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 293 |
| Release | : 2009-01-13 |
| Genre | : Science |
| ISBN | : 3540707034 |
Stable Isotope Geochemistry is an introduction to the use of stable isotopes in the geosciences. It is subdivided into three parts: theoretical and experimental principles; fractionation processes of light and heavy elements; the natural variations of geologically important reservoirs. Since the application of stable isotopes to earth sciences has grown in the last few years, a new edition appears necessary. Recent progress in analysing the rare isotopes of certain elements for instance allow the distinction between mass-dependent and mass-independent fractionations. Special emphasis has been given to the growing field of "heavy" elements. Many new references have been added, which will enable quick access to recent literature. For students and scientists alike the book will be a primary source of information with regard to how and where stable isotopes can be used to solve geological problems.
| Author | : Nathan D. Sheldon |
| Publisher | : Cambridge University Press |
| Total Pages | : 38 |
| Release | : 2021-03-04 |
| Genre | : Science |
| ISBN | : 1108876811 |
Paleosols formed in direct contact with the Earth's atmosphere, so they can record the composition of the atmosphere through weathering processes and products. Herein we critically review a variety of different approaches for reconstructing atmospheric O2 and CO2 over the past three billion years. Paleosols indicate relatively low CO2 over that time, requiring additional greenhouse forcing to overcome the 'faint young Sun' paradox in the Archean and Mesoproterozoic, as well as low O2 levels until the Neoproterozoic. Emerging techniques will revise the history of Earth's atmosphere further and may provide a window into atmospheric evolution on other planets.
