Brittle deformation in pitted pebble conglomerates |
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Authors: | TJ McEwen |
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Institution: | Natural Environmental Research Council, Institute of Geological Sciences, Building 151, Harwell Laboratory, Harwell, Oxon OX11 0RA, England |
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Abstract: | The fracture patterns produced in pitted pebble conglomerates from the Alpine Molasse and the Carboniferous of northern Spain, have been studied in relation to the stress concentrations which were produced in the conglomerates during their deformation. The stress distributions which develop around pebble contacts at different stages of their pitting history have been determined from photoelastic experiments. The development of different types of fracture, having dominantly tensile or shear components, and their distribution within the pebbles, are shown to be related to the mineralogy of the pebbles, the strength of the matrix and the amount of deformation the conglomerate has suffered. |
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