Rodriguez, Darwin, Amsterdam, ..., A second type of Hotspot Island
Rodriguez, Darwin, Amsterdam, ..., A second type of Hotspot Island
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罗德里格斯、达尔文、阿姆斯特丹……，第二种热点岛
DOI：
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发表时间：
1978
期刊：
影响因子：
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通讯作者：
W. J. Morgan
中科院分区：
文献类型：
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作者：
W. J. Morgan
达尔文岛和沃尔夫岛位于加拉帕戈斯群岛主群以北约 200 公里处，呈 315° 排列。罗德里格斯岛位于留尼汪岛以东约 900 公里处一条 090° 走向的长山脊上。这些趋势与这些地区的断裂带或热点趋势有很大不同。雷克雅内斯山脊被解释为从冰岛热点（产生新的软流圈）沿上升轴（软流圈转化为岩石圈）引导的软流圈流的结果。我们建议对不完全位于隆起顶部的热点进行类似的引导——从热点到附近隆起顶部的“管道”，第二种类型的岛屿在隆起和管道的交叉点形成。这些特征的预测趋势可以通过热点上方板块的绝对运动和远离板块的上升波峰的相对运动的矢量相加来找到。
Darwin and Wolf Islands are about 200 km north of the main group of Galapagos Islands and are aligned on a 315° trend. Rodriguez Island is on a long 090° trending ridge about 900 km east of Reunion Island. These trends are very different from the fracture zone or hotspot trends in these areas. The Reykjanes ridge has been interpreted as the result of channeled asthenosphere flow from the Iceland hotspot (which produces new asthenosphere) down the rise axis (where asthenosphere is converted into lithosphere). We propose similar channeling for hotspots not exactly on a rise crest—a ‘pipeline’ from a hotspot to a nearby rise crest, with this second type of island forming at the intersection of the rise and pipeline. Predicted trends for these features may be found by vector addition of the absolute motion of a plate over a hotspot and the relative motion of a rise crest away from a plate.