| Автор | Lenardic, A. |
| Автор | Kaula, W. M. |
| Автор | Bindschadler, D. L. |
| Дата выпуска | 1993 |
| dc.description | Entrainment of lower crust by convective mantle downflows is proposed as a crustal recycling mechanism on Venus. The mechanism is characterized by thin sheets of crust being pulled into the mantle by viscous flow stresses. Finite element models of crust/mantle interaction are used to explore tectonic conditions under which crustal entrainment may occur. The recycling scenarios suggested by the numerical models are analogous to previously studied problems for which analytic and experimental relationships assessing entrainment rates have been derived. We use these relationships to estimate crustal recycling rates on Venus. Estimated rates are largely determined by (1) strain rate at the crust/mantle interface (higher strain rate leads to greater entrainment); and (2) effective viscosity of the lower crust (viscosity closer to that of mantle lithosphere leads to greater entrainment). Reasonable geologic strain rates and available crustal flow laws suggest entrainment can recycle ≈ 1 km<sup>3</sup> of crust per year under favorable conditions. |
| Формат | application.pdf |
| Копирайт | Copyright 1993 by the American Geophysical Union. |
| Тема | PLANETARY SCIENCES: SOLID SURFACE PLANETS |
| Тема | Planetology: Solid Surface Planets and Satellites: Tectonics |
| Тема | Planetology: Solid Surface Planets and Satellites: Interiors |
| Название | A mechanism for crustal recycling on Venus |
| Тип | article |
| DOI | 10.1029/93JE01799 |
| Electronic ISSN | 2156-2202 |
| Print ISSN | 0148-0227 |
| Журнал | Journal of Geophysical Research: Planets |
| Том | 98 |
| Первая страница | 18697 |
| Последняя страница | 18705 |
| Выпуск | E10 |
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