Seismic gap beneath Logachev Seamount: Indicator for melt focusing at an ultraslow mid‐ocean ridge?

Seismic gap beneath Logachev Seamount: Indicator for melt focusing at an ultraslow mid‐ocean ridge?
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洛加切夫海山下方的地震间隙:超慢洋中脊融化聚焦的指标?

DOI:
10.1002/grl.50329
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发表时间:
2013
影响因子:
5.2
通讯作者:
W. Jokat
W. Jokat
中科院分区:
地球科学1区
文献类型:
--
作者:
Schlindwein;A. Demuth;W. H. Geissler ;W. Jokat

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超低扩张洋中脊岩浆收支较低,熔体沿洋中脊轴线分布不均匀。在孤立的岩浆中心之间几乎没有玄武岩壳。目前还不清楚将焦点融化为强大岩浆活动片段的过程。在使用海底地震仪对挪威-格陵兰海的超低扩展Knipovich山脊进行地震调查期间,我们在Logachev海山下方的上地幔中发现了一个地震缺口,在那里微地震清楚地描绘了断层最大深度的浅层。岩石圈的地形允许熔体沿着其底部横向移动,并在薄岩石圈区域上升,这被认为是解释熔体在火山中心集中的可能机制,但从未得到观测证实。我们的研究结果是在一个超低扩展脊上岩石圈厚度沿轴变化的第一个地球物理证据。
Ultraslow spreading mid‐ocean ridges have a low magma budget and melt is distributed unevenly along the ridge axis. There is little or no basaltic crust between isolated magmatic centers. The processes that focus melts to segments of robust magmatism are not yet understood. During a seismic survey of the ultraslow spreading Knipovich Ridge in the Norwegian‐Greenland Sea with ocean bottom seismometers, we discovered a seismic gap in the upper mantle beneath Logachev Seamount, where micro‐earthquakes clearly delineate a shallowing of the maximum depth of faulting. A topography of the lithosphere that allows melts to travel laterally along its base and rise in areas of thin lithosphere has been proposed as a possible mechanism to explain the focusing of melts at volcanic centers, but has never been confirmed observationally. Our results are the first geophysical evidence for an along‐axis variation of the lithospheric thickness at an ultraslow spreading ridge.
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