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Author: Tristan J. Horner
Publisher: Cambridge University Press
ISBN: 9781108791113
Category : Science
Languages : en
Pages : 75
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Book Description
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 precipitation and dissolution are vertically segregated and spatially heterogeneous, barite cycling drives systematic variations in the barium isotope composition of seawater and sediments. This Element examines these variations; evaluates their global, regional, local, and geological controls; and, explores how δ138Ba can be exploited to constrain the origin of enigmatic sedimentary sulfates and to study marine biogeochemistry over Earth's history.
Author: Tristan J. Horner
Publisher: Cambridge University Press
ISBN: 9781108791113
Category : Science
Languages : en
Pages : 75
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Book Description
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 precipitation and dissolution are vertically segregated and spatially heterogeneous, barite cycling drives systematic variations in the barium isotope composition of seawater and sediments. This Element examines these variations; evaluates their global, regional, local, and geological controls; and, explores how δ138Ba can be exploited to constrain the origin of enigmatic sedimentary sulfates and to study marine biogeochemistry over Earth's history.
Author: United States. Dept. of Energy. Technical Information Center
Publisher:
ISBN:
Category :
Languages : en
Pages : 868
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Author:
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Category : Subject headings
Languages : en
Pages : 288
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Author: Weiqi Yao
Publisher: Cambridge University Press
ISBN: 1108847552
Category : Science
Languages : en
Pages : 47
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Book Description
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 tracers that record seawater compositions, which in turn may be used to infer oceanic processes. Several important tracers are incorporated into pelagic barite, an authigenic mineral that forms in the water column. Here we summarize the utility of pelagic barite for the reconstruction of export production and as a recorder of seawater S, O, Sr, Ca and Ba.
Author: U.S. Atomic Energy Commission
Publisher:
ISBN:
Category : Subject headings
Languages : en
Pages : 498
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Author: U.S. Atomic Energy Commission
Publisher:
ISBN:
Category : Subject headings
Languages : en
Pages : 346
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Author:
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Category : Aeronautics
Languages : en
Pages : 882
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Author: Philip A. E. Pogge von Strandmann
Publisher: Cambridge University Press
ISBN: 1108997627
Category : Science
Languages : en
Pages : 51
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Book Description
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 fractionate dissolved and sedimentary Li isotope ratios, focusing on weathering intensity and clay formation. We then discuss the carbonate and silicate archive potential of past seawater δ7Li. These archives have been used to examine Li isotope changes across both short and long timescales. The former can demonstrate the rates at which the climate is stabilised from perturbations via weathering, a fundamental piece of the puzzle of the long-term carbon cycle.
Author:
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Category : Nuclear energy
Languages : en
Pages : 940
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Author: U.S. Atomic Energy Commission
Publisher:
ISBN:
Category : Subject headings
Languages : en
Pages : 290
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