Magmatic controls on axial relief and faulting at mid-ocean ridges
Magmatic controls on axial relief and faulting at mid-ocean ridges
复制标题
岩浆对大洋中脊轴向起伏和断层的控制
DOI:
10.1016/j.epsl.2018.03.045
复制
发表时间:
2018
影响因子:
5.3
通讯作者:
Buck, W. Roger
中科院分区:
文献类型:
--
作者:
Liu, Zhonglan;Buck, W. Roger
Previous models do not simultaneously reproduce the observed range of axial relief and fault patterns at plate spreading centers. We suggest that this failure is due to the approximation that magmatic dikes open continuously rather than in discrete events. During short–lived events, dikes open not only in the strong axial lithosphere but also some distance into the underlying weaker asthenosphere. Axial valley relief affects the partitioning of magma between the lithosphere and asthenosphere during diking events. The deeper the valley, the more magma goes into lithospheric dikes in each event and so the greater the average opening rate of those dikes. The long-term rate of lithospheric dike opening controls faulting rate and axial depth. The feedback between axial valley depth D and lithospheric dike opening rate allows us to analytically relate steady-state values of D to lithospheric thickness H L and crustal thickness H C. A two-dimensional model numerical model with a fixed axial lithospheric structure illustrates the analytic model implications for axial faulting. The predictions of this new model are broadly consistent with global and segment-scale trends of axial depth and fault patterns with H L and H C.
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DOI:
--
发表时间:
1978
期刊:
影响因子:
--
作者:
P. Einarsson;B. Brandsdóttir
通讯作者:
B. Brandsdóttir
影响因子:
64.8
作者:
MORGAN, JP;CHEN, YJ
通讯作者:
CHEN, YJ
DOI:
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1994
期刊:
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通讯作者:
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2005
期刊:
影响因子:
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作者:
R. Qin;W. Buck
通讯作者:
W. Buck
影响因子:
3.9
作者:
Buck, WR
通讯作者:
Buck, WR