The relationship of the Cocos and Carnegie ridges: age constraints from paleogeographic reconstructions
The relationship of the Cocos and Carnegie ridges: age constraints from paleogeographic reconstructions
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科科斯海岭和卡内基海岭的关系：古地理重建的年龄限制
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
U. Barckhausen
中科院分区：
文献类型：
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作者：
M. Meschede;U. Barckhausen
通过对Cocos-Nacza扩张中心及其前身形成的洋壳的古地理学研究，重建了东太平洋海盆海底海隆脊、Carnegie脊、Coiba脊、Cocos脊和Malpelo脊的历史和时代。卡耐基海岭的两部分反映了从一个先驱到目前活跃的科科斯-纳斯卡扩张中心的转变。科科斯海脊部分由加拉帕戈斯热点的产物组成，但也可能包含来自加拉帕戈斯东北约600公里处的第二个火山活动中心的物质。马尔佩洛海脊是第二个热点中心的产物，而科伊巴海脊可能形成于加拉帕戈斯热点。科科斯海脊和卡内基海脊的几何关系表明，目前活跃的科科斯-纳斯卡海脊的扩张中心是对称的，并不断向北移动。
Paleogeographic restorations for the oceanic crust formed by the Cocos-Nacza spreading center and its precursors were performed to reconstruct the history and ages of the submarine aseismic ridges in the Eastern Pacific Basin, the Carnegie, Coiba, Cocos, and Malpelo ridges. The bipartition of the Carnegie ridge reflects the shift from a precursor to the presently active Cocos-Nazca spreading center. The Cocos ridge is partly composed of products from the Galápagos hotspot but may also contain material from a second center of volcanic activity which is located approximately 600 km NE of Galápagos. The Malpelo ridge is a product of this second hotspot center, whereas the Coiba ridge probably formed at the Galápagos hotspot. The geometric relationship of the Cocos and Carnegie ridges indicates symmetric spreading and a constant northward shift of the presently active Cocos-Nazca spreading center.