The origin of the glacio-dynamic structure of the Bride Moraine, Isle of Man |
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| Authors: | GEOFFREY S P THOMAS |
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| Institution: | Department of Geography, University of Liverpool, Liverpool L69 3BX, England |
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| Abstract: | In general terms the form of the Bride Moraine, its internal structure, and part of its stratigraphy result from a minor ice-sheet readvance during a late stage of the Devensian deglaciation of the Irish Sea basin. Four major structural styles are identified and are related to four structural zones that run parallel to the crest of the ice-thrust ridge. The structures result from the development of differential permafrost in a sequence of highly contrasting lithologies and the consequent generation of high pore-water pressures during ice-marginal loading. This caused mobilisation of water-saturated clays in the sequence and the development of large-scale diapiric structure in the core of the moraine and low-angles overthrust faulting on the flanks. |
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