Elements in Geochemical Tracers in Earth System Science – serie
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23 produkter
Local and Global Controls on Carbon Isotope Chemostratigraphy
Häftad, 2022
308 kr
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Over million-year timescales, the geologic cycling of carbon controls long-term climate and the oxidation of Earth's surface. Inferences about the carbon cycle can be made from time series of carbon isotopic ratios measured from sedimentary rocks. The foundational assumption for carbon isotope …
Triple Oxygen Isotopes
Av Huiming Bao
Häftad, 2019
308 kr
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The 'detective' power of stable isotopes for processes that occurred in the past, and for elucidating mechanisms at the molecular level, has impressed researchers over the past 100 years, since the time when isotopes of elements were first discovered. While most are interested in the normalized …
Earth History of Oxygen and the iprOxy
Häftad, 2020
308 kr
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How oxygen levels in Earth's atmosphere and oceans evolved has always been a central question in Earth System Science. Researchers have developed numerous tracers to tackle this question, utilizing geochemical characteristics of different elements. Iodine incorporated in calcium carbonate …
Application of Thallium Isotopes
Tracking Marine Oxygenation through Manganese Oxide Burial
Häftad, 2020
308 kr
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Tracking initial ocean (de)oxygenation is critical to better constrain the coevolution of life and environment. Development of thallium isotopes has provided evidence to track the global manganese oxide burial which responds to early (de)oxygenation for short-term climate events. Modern oxic …
The Uranium Isotope Paleoredox Proxy
Av Kimberly V. Lau, Stephen J. Romaniello m. fl.
Häftad, 2019
308 kr
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Uranium isotopes (238U/235U) have emerged as a proxy to reconstruct the redox conditions of the Earth's oceans and atmosphere based upon the large isotopic fractionation between reduced U(IV) and oxidized U(VI). Variations in 238U/235U, particularly when recorded in carbonate sediments, can track …
Selenium Isotope Paleobiogeochemistry
Av Eva E. Stüeken, Michael A. Kipp
Häftad, 2020
308 kr
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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 …
Barium Isotopes
Drivers, Dependencies, and Distributions through Space and Time
Av Tristan J. Horner, Peter W. Crockford
Häftad, 2021
302 kr
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In the modern marine environment, barium isotope (δ138Ba) variations are primarily driven by barite cycling-barite incorporates 'light' Ba isotopes from solution, rendering the residual Ba reservoir enriched in 'heavy' Ba isotopes by a complementary amount. Since the processes of barite …
The Chromium Isotope System as a Tracer of Ocean and Atmosphere Redox
Av Kohen W. Bauer, Noah J. Planavsky m. fl.
Häftad, 2021
308 kr
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The stable chromium (Cr) isotope system has emerged over the past decade as a new tool to track changes in the amount of oxygen in earth's ocean-atmosphere system. Much of the initial foundation for using Cr isotopes (δ53Cr) as a paleoredox proxy has required recent revision. However, the basic …
Vanadium Isotopes
A Proxy for Ocean Oxygen Variations
Häftad, 2021
308 kr
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Vanadium isotope ratios (51V/50V) have potential to provide information about changes in past ocean oxygen contents. In particular, V isotopes may find utility in tracing variations at non-zero oxygen concentrations because the redox couple that controls V elemental and isotopic abundances in …
The Pyrite Trace Element Paleo-Ocean Chemistry Proxy
Häftad, 2020
302 kr
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The use of the trace element content of sedimentary pyrite as a proxy for the trace element composition of past oceans has recently emerged. The pyrite proxy has several potential advantages over bulk sample analysis: preservation through metamorphism; little dilution during analysis (samples are …
The TEX86 Paleotemperature Proxy
Av Gordon N. Inglis, Jessica E. Tierney
Häftad, 2020
308 kr
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The TEX86 paleothermometer is based upon the distribution of archaeal membrane lipids ('GDGTs') in marine sediments. GDGTs are ubiquitous, abundant and relatively resistant to degradation; as such, the TEX86 paleothermometer has been used to reconstruct sea surface temperature (SST) during the …
Emerging Patterns in Proterozoic Lipid Biomarker Records
Av Gordon D. Love, J. Alex Zumberge
Häftad, 2021
308 kr
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Diverse and abundant lipid biomarker assemblages have been reported from a variety of Proterozoic marine environments from the careful analysis of well-preserved rocks and oils. These molecular biosignatures have provided unique insights into the communities and the environmental conditions which …
The Iron Speciation Paleoredox Proxy
Häftad, 2021
308 kr
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In one form or another, iron speciation has had a long history as a paleoredox proxy. The technique has been refined considerably over the years, and the most recent scheme is unique in its potential to distinguish three major oceanic redox states - oxygenated, ferruginous and euxinic. This Element …
Pelagic Barite
Tracer of Ocean Productivity and a Recorder of Isotopic Compositions of Seawater S, O, Sr, Ca and Ba
Av Weiqi Yao, Elizabeth Griffith m. fl.
Häftad, 2021
308 kr
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Reconstruction of ocean paleoproductivity and paleochemistry is paramount to understanding global biogeochemical cycles such as the carbon, oxygen and sulfur cycles and the responses of these cycles to changes in climate and tectonics. Paleo-reconstruction involves the application of various …
Nitrogen Isotopes in Deep Time
Av Colin Mettam, Aubrey L. Zerkle
Häftad, 2021
308 kr
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Nitrogen is an essential nutrient for life, and its sources and cycling have varied over earth history. Stable isotope ratios of nitrogen compounds (expressed as δ15N, in ‰) are preserved in the sedimentary record and track these changes, providing important insights into associated biogeochemical …
Cerium Anomalies and Paleoredox
Häftad, 2021
308 kr
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Ce anomalies track changes in oxygen availability due to the anomalous redox-sensitivity of Ce compared with the other rare earth elements. The proxy systematics have been calibrated experimentally as well as in modern anoxic water bodies. Ce anomalies are unique because they track intermediate …
Calcium Isotopes
Av Elizabeth M. Griffith, Matthew S. Fantle
Häftad, 2021
308 kr
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Precise measurements of the calcium (Ca) isotopes have provided constraints on Ca cycling at global and local scales, and quantified rates of carbonate diagenesis in marine sedimentary systems. Key to applying Ca isotopes as a geochemical tracer of Ca cycling, carbonate (bio)mineralization, and …
Reconstructing Precambrian pCO2 and pO2 Using Paleosols
Av Nathan D. Sheldon, Ria L. Mitchell m. fl.
Häftad, 2021
308 kr
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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. …
Lithium Isotopes
A Tracer of Past and Present Silicate Weathering
Av Philip A. E. Pogge von Strandmann, Mathieu Dellinger m. fl.
Häftad, 2021
308 kr
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Lithium isotopes are a relatively novel tracer of present and past silicate weathering processes. Given that silicate weathering is the primary long-term method by which CO2 is removed from the atmosphere, Li isotope research is going through an exciting phase. We show the weathering processes that …
Sr Isotopes in Seawater
Stratigraphy, Paleo-Tectonics, Paleoclimate, and Paleoceanography
Av B. Lynn Ingram, Donald J. DePaolo
Häftad, 2022
302 kr
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Studies of Sr isotopic composition of thousands of samples of marine sediments and fossils have yielded a curve of 87Sr/86Sr versus age for seawater Sr that extends back to 1 billion years. The ratio has fluctuated with large amplitude during this time period, and because the ratio is always …
Magnesium Isotopes
Tracer for the Global Biogeochemical Cycle of Magnesium Past and Present or Archive of Alteration?
Häftad, 2022
308 kr
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Magnesium is a major constituent in silicate and carbonate minerals, the hydrosphere and the biosphere. Magnesium is constantly cycled between these reservoirs. Since each of the major planetary reservoirs of magnesium have different magnesium isotope ratios, there is scope to use magnesium isotope …
Molybdenum as a Paleoredox Proxy
Past, Present, and Future
Av Stephan R. Hlohowskyj, Anthony Chappaz m. fl.
Häftad, 2021
308 kr
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Molybdenum (Mo) is a widely used trace metal for investigating redox conditions. However, unanswered questions remain that concentration and bulk isotopic analysis cannot specially answer. Improvements can be made by combining new geochemical techniques to traditional methods of Mo analysis. In …
Iron Formations as Palaeoenvironmental Archives
Av Kaarel Mänd, Leslie J. Robbins m. fl.
Häftad, 2022
308 kr
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Ancient iron formations - iron and silica-rich chemical sedimentary rocks that formed throughout the Precambrian eons - provide a significant part of the evidence for the modern scientific understanding of palaeoenvironmental conditions in Archaean (4.0-2.5 billion years ago) and Proterozoic …
