Weathering

Weathering - . formed courtesy of WEATHERING Breaking Up Is...

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© 2009 W.W. Norton “Breaking Up Is Hard To Do” ... formed courtesy of WEATHERING A Surface Veneer: Sediments and Soils
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© 2009 W.W. Norton Horsemen of Destruction: Wind Wind Water Water Ice Ice Time Time
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© 2009 W.W. Norton Weathering Processes Physical Weathering : Fragmentation Disintegration Weathering product in solid state Chemical Weathering : • Alteration • Decomposition • Weathering product in ionic and liquid form Regolith = loose, unconsolidated, residual or transported material that covers bedrock
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© 2009 W.W. Norton PHYSICAL Weathering Unloading Unloading Spheroidal Weathering/ Exfoliation; Spheroidal Weathering/ Exfoliation; also called onion-skin weathering also called onion-skin weathering Frost Wedging Frost Wedging
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© 2009 W.W. Norton Differential weathering Sawtooth weathering profiles in sedimentary beds, New Mexico. Weak shale Strong sandstone Fig. B.8c
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© 2009 W.W. Norton Jointing can develop when erosion removes overburden. D o w n a rd p re s su Exfoliation joints Vertical joints After erosion removes overburden, rocks expand, cool, and crack, to form joints. When buried deeply, rocks are subjected to intense pressure, and heat. Fig. B.4a Unloading
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Examples of jointing Vertical joints intersect bedding to form rectangular blocks. Exfoliation joints are parallel to the ground surface, so rock peels off. Sierra Nevada, California.
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Weathering - . formed courtesy of WEATHERING Breaking Up Is...

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