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(Article of periodic en Anglais - 2013)

Document title

Probing deep weathering in the Shale Hills Critical Zone Observatory, Pennsylvania (USA) : the hypothesis of nested chemical reaction fronts in the subsurface

Authors(s) and Affiliation(s)

BRANTLEY S.L. (1) ; HOLLERAN M.E. (1) ; JIN L. (1 2) ; BAZILEVSKAYA E. (1) ;
(1) Earth and Environmental Systems Inst., Dept. of Geosciences, Pennsylvania State Univ., University Park, ETATS-UNIS
(2) Dept. of Geological Sciences, Univ. of Texas, El Paso, ETATS-UNIS

Abstract

To determine such depths, cuttings of Rose Hill shale were investigated from one borehole from the ridge and four boreholes from the valley at the Susquehanna Shale Hills Observatory (SSHO). It is shown that carbonate depletion coincides with the winter water table observed at ~20 m (ridge) and ~2 m depth (valley). Furthermore, pyrite and carbonate react quickly and many deep reaction fronts for these minerals are described in the literature. The AA. propose that deep transport of O2 initiates weathering at SSHO and many other localities because pyrite commonly oxidizes autocatalytically to acidify porewaters and open porosity. According to this hypothesis, the mineral distributions at SSHO are nested reaction fronts that overprint protolith stratigraphy. The fronts are hypothesized to lie subparallel to the land surface. To understand how reaction fronts record long-term coupling between erosion and weathering will require intensive mapping of the subsurface

Source

Article of periodic

published at : Earth surface processes and landforms / ISSN 0197-9337 / CODEN ESPLDB

Editor : Wiley, Chichester - ROYAUME-UNI (1981)

Millesime : 2013, vol. 38, no11 [pp. 1280-1298]

Bibliographic references : 2 p.

Collation : 11 fig., 10 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.3415

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2014
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