کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5487218 | 1523492 | 2018 | 63 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Two-phase convection in Ganymede's high-pressure ice layer -Â Implications for its geological evolution
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علوم فضا و نجوم
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![عکس صفحه اول مقاله: Two-phase convection in Ganymede's high-pressure ice layer -Â Implications for its geological evolution Two-phase convection in Ganymede's high-pressure ice layer -Â Implications for its geological evolution](/preview/png/5487218.png)
چکیده انگلیسی
Ganymede, the largest moon in the solar system, has a fully differentiated interior with a layer of high-pressure (HP) ice between its deep ocean and silicate mantle. In this paper, we study the dynamics of this layer using a numerical model of two-phase ice-water mixture in two-dimensional Cartesian geometry. While focusing on the generation of water at the silicate/HP ice interface and its upward migration towards the ocean, we investigate the effect of bottom heat flux, the layer thickness, and the HP ice viscosity and permeability. Our results suggest that melt can be generated at the silicate/HP ice interface for small layer thickness (â¯â²â¯200â¯km) and high values of heat flux (â¯â³â¯20â¯mWâ¯mâ2) and viscosity (â¯â³â¯1015â¯Paâ¯s). Once generated, the water is transported through the layer by the upwelling plumes. Depending on the vigor of convection, it stays liquid or it may freeze before melting again as the plume reaches the temperate (partially molten) layer at the boundary with the ocean. The thickness of this layer as well as the amount of melt that is extracted from it is controlled by the permeability of the HP ice. This process constitutes a means of transporting volatiles and salts that might have dissolved into the melt present at the silicate/HP ice interface. As the moon cools down, the HP ice layer becomes less permeable because the heat flux from the silicates decreases and the HP ice layer thickens.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Icarus - Volume 299, 1 January 2018, Pages 133-147
Journal: Icarus - Volume 299, 1 January 2018, Pages 133-147
نویسندگان
Klára Kalousová, Christophe Sotin, Gaël Choblet, Gabriel Tobie, Olivier Grasset,