High pressure constraints on percolative core formation

被引:61
作者
Shannon, MC
Agee, CB
机构
[1] Dept. of Earth and Planet. Sciences, Harvard University, Cambridge, MA
[2] Dept. of Earth and Planet. Sciences, Harvard University, Cambridge
关键词
D O I
10.1029/96GL02817
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
The effect of pressure on the wetting behavior of liquid Fe-Ni-S alloy in a solid silicate matrix was investigated. Experiments were performed on a chondritic starting material in piston-cylinder and multi-anvil apparatuses over a pressure range of 2 to 20 GPa, at temperatures below the silicate solidus. The dihedral angle of the quenched liquid iron alloy in contact with the silicate matrix exhibited no change over the pressure interval. The average value of 108 degrees for the dihedral angle is well above the 60 degrees critical value for efficient percolation of iron alloy through a solid matrix, therefore core formation by percolation at upper mantle pressures is not feasible. We conclude that melting of the silicate mantle may be required for efficient planetary core formations.
引用
收藏
页码:2717 / 2720
页数:4
相关论文
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    AGEE, CB
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