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Many areas in the world are characterized by shallow soils underlain by weathered bedrock, but root-rock interactions and their implications for regolith weathering are poorly understood. To test the role of tree roots in weathering bedrock, we excavated four pits along a catena in a shale-dominated catchment at the Susquehanna Shale Hills Critical Zone Observatory (SSHCZO) in central Pennsylvania...
In order to characterize the petrological and chemical effects of illuviation, we collected 14 samples from an ~6.7m high tonalitic corestone (tor) and 17 samples of saprock from an adjacent ~65cm deep trench extending laterally ~1.5m. Based on thin section observations, all saprock samples are characterized by a network of transgranular and intergranular cracks filled or lined with illuviated clay...
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