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Shock pressures in igneous processes: Implications for K/T events

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Extinction Events in Earth History

Part of the book series: Lecture Notes in Earth Sciences ((LNEARTH,volume 30))

Abstract

The seismicity initiating the May 18, 1980 catastrophic eruption at Mt. St. Helens indicates an explosion occurred at depth generating an average pressure of about 500 kbar. Such pressures fall off with distance from the magma chamber although jointing, fractures, etc. may act as stress concentrators to extend the radius of formation of shocked minerals as far as a kilometer. Shocked minerals are not to be expected from the magma itself as high temperatures would anneal such features but temperatures fall away rapidly enough from the chamber wall to allow retention even of such possible exotics as stishovite. The subsequent kinetics of the failure of the north slope support these pressures as do thermodynamic considerations and nucleation kinetics of CO2 exsolution from magmatic melt. Confining pressures (e.g., overburden head) are not a limiting factor. Unconfined detonations in open air yield pressures to several megabars although some recent arguments asserted to be volcanological would indicate open air bursts greater than one bar to be impossible. Further, it has been indicated that pressure estimates from ballistic considerations have been too high and large phenocryst content in the discharge material argues against high pressure explosions. In the first instance, sonic choking and volatile diffusion time constraints make these assessments implausible and in the second instance, both theoretical and geological considerations provide for the phenocryst distributions under explosive situations. These results and recent discoveries of high levels of iridium in volcanic ash in the Antarctic blue ice have implication for K/T boundary events, mass extinctions and endoexplosions. The geographical breadth of volcanic activity attending the K-T transition (e.g., Antarctic volcanism as well as the Deccan Traps) indicates a global mechanism and suggests a large portion of the mantle experienced convective surge as occurs at high Rayleigh number flow. Scaling to mantle conditions yields episodicities of the same order as the 30 my intervals.

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  1. Department of Physics, University of Denver, 1100 14th Street, 80202, Denver, Co, USA

    Alan Rice

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Erle G. Kauffman Otto H. Walliser

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Rice, A. (1990). Shock pressures in igneous processes: Implications for K/T events. In: Kauffman, E.G., Walliser, O.H. (eds) Extinction Events in Earth History. Lecture Notes in Earth Sciences, vol 30. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0011135

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  • DOI: https://doi.org/10.1007/BFb0011135

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