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- W2339987538 abstract "Core Ideas Detailed characterization of the morphology, geochemistry, and mineralogy of shale‐derived soils across a climosequence documents enhanced weathering and soil development with increasingly warm and wet climates. The deepest weathering reaction observed in the regolith across the shale climosequence was plagioclase feldspar dissolution, which may be the profile initiating reaction that begins the transformation of shale bedrock to weathered regolith. The abundance of chlorite and its transformation to vermiculite and HIV are more likely controlling regolith thickness in these soils. To investigate factors controlling soil formation, we established a climosequence as part of the Susquehanna‐Shale Hills Critical Zone Observatory (SSHCZO) in central Pennsylvania, USA. Sites were located on organic matter‐poor, iron‐rich Silurian‐aged shale in Wales, Pennsylvania, Virginia, Tennessee, Alabama, and Puerto Rico, although this last site is underlain by a younger shale. Across the climosequence, mean annual temperature (MAT) increases from 7 to 24°C and mean annual precipitation (MAP) ranges from 100 to 250 cm. Variations in soil characteristics along the climosequence, including depth, morphology, particle‐size distribution, geochemistry, and bulk and clay mineralogy, were characterized to investigate the role of climate in controlling mineral transformations and soil formation. Overall, soil horizonation, depth, clay content, and chemical depletion increase with increasing temperature and precipitation, consistent with enhanced soil development and weathering processes in warmer and wetter locations. Secondary minerals are present at higher concentrations at the warmest sites of the climosequence; kaolinite increases from <5% at northern sites in Wales and Pennsylvania to 30% in Puerto Rico. The deepest observed weathering reaction is plagioclase feldspar dissolution followed by the transformation of chlorite and illite to vermiculite and hydroxy‐interlayered vermiculite. Plagioclase, although constituting <12% of the initial shale mineralogy, may be the profile initiating reaction that begins shale bedrock transformation to weathered regolith. Weathering of the more abundant chlorite and illite minerals (∼70% of initial mineralogy), however, are more likely controlling regolith thickness. Climate appears to play a central role in driving soil formation and mineral weathering reactions across the climosequence." @default.
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- W2339987538 date "2016-05-01" @default.
- W2339987538 modified "2023-09-25" @default.
- W2339987538 title "Mineralogical Transformations and Soil Development in Shale across a Latitudinal Climosequence" @default.
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- W2339987538 doi "https://doi.org/10.2136/sssaj2015.05.0202" @default.
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