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- W53349480 abstract "Introduction: This study uses the decay of K to Ca to investigate the contributions of weathering silicate upper crust (SUC), with elevated K/Ca, to the oceans. This is in contrast to mantle contributions which have very low K/Ca. The expected isotopic effects are small (a few epsilon units) and require high precision measurements. It was found that there were no detectable enrichments in Ca/ Ca (<0.3 eu) for carbonates ranging in age from recent to ~3.6 Ga age. It follows that the Ca chemistry of the oceans has been governed by mantle contributions, through the ongoing activity of hydrothermal processes in the oceanic upper crust over geologic time. These hydrothermal exchange processes are a direct reflection of an ongoing mantle convection process over Earth history. Results: We present high precision Ca isotopic data for Archean, Proterozoic carbonates, river waters and a series of terrestrial and extraterrestrial mafic rocks. The latter samples were analyzed to define the reference parameters for the K-Ca system for the Earth and early solar system. The effects to be expected from average SUC contributions are: 40 4 40 40 0 10 ( / )" @default.
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- W53349480 date "2010-03-01" @default.
- W53349480 modified "2023-09-28" @default.
- W53349480 title "40Ca Isotopic Evolution of the Oceans and Crust and the Major Role of Hydrothermal Circulation Over Geologic Time" @default.
- W53349480 hasPublicationYear "2010" @default.
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