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地幔柱与洋脊分段成因探讨
Mantle plume and the cause of the segmentation of ocean ridges
投稿时间:2009-11-02  修订日期:2010-01-06
DOI:
中文关键词:  地幔柱 洋脊分段 成因 转换断层
英文关键词:mantle plume  segmentation of ocean ridges  cause  transform fault
基金项目:
作者单位邮编
钟福平* 河南理工大学 454003
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中文摘要:
      地幔柱产生岩浆的核幔交界部位相当于“岩浆洋”,下地幔与上地幔、上地幔与软流圈之间的岩浆流通道相当于“岩浆河流”,岩浆由软流圈经岩石圈喷出地表这之间的通道,相当于“岩浆小溪”。在它们之间都会有许多的“岩浆支流”,其中有“支流”将这些“河流”与“河流”或“河流”与“小溪”之间联系起来。洋脊分段现象是由于地幔柱中存在横向的“岩浆支流”,它们横向流动,在岩体底部产生了方向相反的剪切应力,使得洋壳与洋壳之间产生位移错动。洋脊分段是伴随洋壳之间的相互位移错动而形成。1级洋脊分段下伏的“岩浆支流”在深度、规模、产生的应力均要远大于2、3、4级。本文在研究洋脊分段的动力学性质上与前人研究的洋脊分段主要受地幔岩浆周期性脉动上涌控制有本质区别。
英文摘要:
      Mantle plume generates at the junction of parts of the core-mantle magma equivalent of a "magma ocean", the lower mantle and upper mantle, upper mantle and the asthenosphere magma flow of Road between the equivalent of a "river of magma," magma from the asthenosphere through the lithosphere spray out of the ground in between the channels, the equivalent of "magma stream." Between them, there will be many "magma tributary", which the "tributary" to these "river" and "river" or "river" and "stream" between linked. Sub-sub-oceanic mantle plume is due to the existence of horizontal "magma tributary", which lateral flow, generated in the rock at the bottom of the shear stress in the opposite direction, making ocean crust and oceanic crust created between the displacement of dislocation. A sub-oceanic ridge "magma tributary" in depth, size, produced by stress have to be much larger than two, three, four. This and previous studies mainly affected by sub-ridge mantle upwelling of magma pulse control of non-cyclical dynamics are essentially different in nature.
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