On the Upward Migration of an Intrusion
| Autor: | E. R. Oxburgh, J. L. Ahern, D. L. Turcotte |
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| Rok vydání: | 1981 |
| Předmět: | |
| Zdroj: | The Journal of Geology. 89:421-432 |
| ISSN: | 1537-5269 0022-1376 |
| DOI: | 10.1086/628606 |
| Popis: | A mechanism is examined which allows an intrusive body to melt its way upward in the earth's crust. Due to the increase in melting temperature with depth the melt temperature at the base of an intrusion may be considerably greater than the melt temperature at the top. This temperature difference can drive rapid convection in the intrusion; as a result heat is rapidly transferred to the top of the intrusion. This heat transport can cause melting of the country rock above the intrusion as solidification occurs at the base; the magma zone migrates upwards. Calculations show that this effect can become important in intrusions with a height greater than about 1 km; the effect is also more important when the temperature difference between the country rock and the intrusion is small and if the magma viscosity is low. |
| Databáze: | OpenAIRE |
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