Subsurface particle transport shapes the deep critical zone in a granitoid watershed

X. Gu, H. Kim, S. Hynek, A. Thompson, S.L. Brantley

Publikation: Bidrag til tidsskriftArtikelForskningpeer review

2 Citationer (Scopus)

Abstrakt

Understanding the inter-relationships between chemical weathering and physical
erosion remains a first order puzzle in Earth surface dynamics. In the Río Icacos
watershed in the Luquillo Critical Zone Observatory, Puerto Rico, where some of
the world’s fastest weathering of granitoid watersheds has been measured, we show that chemical weathering not only releases dissolved solutes, but also weakens the rock around the fractures until particles detach and are mobilised by subsurface flow through fractures. These sand-sized particles are more weathered than corestones, but much less weathered than soils/saprolites. Subsurface removal of these clayenriched, magnetite-depleted particles from the fractures could explain zones with enhanced magnetic susceptibility and decreased terrain conductivity that are observed in geophysical surveys. Subsurface particle transport may thus contribute to geophysical signatures and help sustain high weathering fluxes at Río Icacos and other steep and highly fractured landscapes.
OriginalsprogEngelsk
Sider (fra-til)13-18
Antal sider6
TidsskriftGeochemical Perspectives Letters
Vol/bind19
DOI
StatusUdgivet - 2021

Programområde

  • Programområde 2: Vandressourcer

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