New PDF release: Major impacts and plate tectonics: a model for the

By Neville J Price

ISBN-10: 0203165454

ISBN-13: 9780203165454

ISBN-10: 0203280032

ISBN-13: 9780203280034

ISBN-10: 0415238994

ISBN-13: 9780415238991

ISBN-10: 0748408509

ISBN-13: 9780748408504

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Extra resources for Major impacts and plate tectonics: a model for the Phanerozoic evolution of the earth's lithosphere

Sample text

One final and over-ridingly important characteristic is that oceanic lithosphere is more dense than the underlying asthenosphere. Consequently, oceanic lithosphere is always intrinsically unstable and, given the opportunity, will sink into the depths of the mantle. 3 Response of lithosphere to loading It was estimated by Darwin (1882), who assumed the Earth’s topography to be uncompensated, that the stress difference required to support the differences in topographic elevation could be as much as 600 bar.

The rock surface, on which the gauges are placed, is then isolated from the surrounding rock by over-coring. The free surface around the gauges permits the rock stresses in the cylindrical stub, beneath the strain-gauged surface, to induce strains which are recorded by the strain-gauges. The elastic moduli (Young’s modulus E and Poisson’s number m) for the rock are subsequently ascertained in the laboratory from the detached stub, or a sample taken from an adjacent site. The strain-data obtained by over-coring can then be translated into magnitudes and orientation of in situ, principal two-dimensional stress.

The rock surface, on which the gauges are placed, is then isolated from the surrounding rock by over-coring. The free surface around the gauges permits the rock stresses in the cylindrical stub, beneath the strain-gauged surface, to induce strains which are recorded by the strain-gauges. The elastic moduli (Young’s modulus E and Poisson’s number m) for the rock are subsequently ascertained in the laboratory from the detached stub, or a sample taken from an adjacent site. The strain-data obtained by over-coring can then be translated into magnitudes and orientation of in situ, principal two-dimensional stress.

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Major impacts and plate tectonics: a model for the Phanerozoic evolution of the earth's lithosphere by Neville J Price


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