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Lithium Isotopic Fractionation During Weathering and Erosion of Shale by Grit Steinhoefel; Susan L. Brantley; Matthew S. Fantle is a Earth and Planetary Sciences article available to read on EtoBox.

What is Lithium Isotopic Fractionation During Weathering and Erosion of Shale about?

Clay weathering in shales is an important component of the global Li budget because Li is mobilized from Li-rich clay minerals and shale represents about one quarter of the exposed rocks on Earth. We investigate Li isotopes and concentrations to explore implications and mechanisms of Li isotopic fractionation in Shale Hills, a first-order catchment developed entirely on shale in a temperate climate in the Appalachian Mountains, northeastern USA. The Li isotopic compositions (d 7 Li) of aqueous Li in stream water and groundwater vary between 14.5 and 40.0‰. This range is more than half that observed in rivers globally. The d 7 Li of aqueous Li increases with increasing Li retention in secondary minerals, which is simulated using a box model that considers pore fluid advection to be the dominant transport process, silicate dissolution to be the source of Li to the pore fluid, and uptake of Li by kaolinite, Fe-oxides, and interlayer sites of clays to be the sinks. The simulations suggest that only those deep groundwaters with d 7 Li values of $15‰ are explainable as steady state values; those fluids with d 7 Li values > 18‰, especially near-surface waters, can only be explained as tim

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Author

Grit Steinhoefel; Susan L. Brantley; Matthew S. Fantle

Publisher

Elsevier BV

Published

2021

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)