The recent history of the Galapagos triple junction preserved on the Pacific plate

The recent history of the Galapagos triple junction preserved on the Pacific plate
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太平洋板块上保存的加拉帕戈斯三重交界点的近代历史

DOI:
10.1016/j.epsl.2013.04.018
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发表时间:
2013
影响因子:
5.3
通讯作者:
Zhu, Wenlu
Zhu, Wenlu
中科院分区:
地球科学1区
文献类型:
--
作者:
Smith, Deborah K.;Schouten, Hans;Montési, Laurent;Zhu, Wenlu

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在加拉帕戈斯的三重连接处,科科斯和纳斯卡板块被科科斯-纳斯卡裂谷(C-N)南北的一系列瞬时裂谷所破坏。模拟表明,每个裂谷都起源于东太平洋隆起(EPR),其位置由C-N裂谷尖端与EPR的距离控制。太平洋板块上的证据证实,每个瞬时裂谷都与EPR形成了真正的RRR三联点,并澄清了该地区的历史。在1.5Ma,三联点开始迅速地向C-N裂谷跳跃,这表明C-N裂谷的尖端向EPR移动得更近。太平洋深海丘陵变宽变浅,表明该地区的岩浆供应增加。1.4Ma时,伸展作用固定在南部的瞬时裂谷上,形成了未来迪茨裂谷盆地的南崖,形成了加拉帕戈斯微板块。岩浆淹没了该地区,加拉帕戈斯-纳斯卡岩浆扩散中心在EPR开始。我们认为,一个热点正在从西部接近南部的三重连接点。热点穿越到纳斯卡板块约1.25Ma。迪茨海山在年轻的扩张中心内形成,岩脉侵入迪茨裂谷盆地,喷发形成火山脊。8 Ma以来,岩浆分异有两次向北跳跃,最近一次是向Dietz火山脊。向东的岩浆伸展作用形成了迪茨裂谷盆地的北陡坎。南部三联点向北的跳跃使微板块边界保持在建议的热点附近。
At the Galapagos triple junction, the Cocos and Nazca plates are broken by a succession of transient rifts north and south of the Cocos–Nazca (C–N) Rift. Modeling has suggested that each rift initiated at the East Pacific Rise (EPR), its location controlled by the distance of the C–N Rift tip from the EPR. Evidence on the Pacific plate confirms that each transient rift formed a true RRR triple junction with the EPR and clarifies the history of the region. At ∼1.5Ma the triple junctions began jumping rapidly toward the C–N Rift suggesting that the C–N Rift tip moved closer to the EPR. Pacific abyssal hills became broad and shallow indicating enhanced magma supply to the region. At ∼1.4Ma, the Galapagos microplate developed when extension became fixed on the southern transient rift to form the South scarp of the future Dietz rift basin. Lavas flooded the area and a Galapagos–Nazca magmatic spreading center initiated at the EPR. We suggest that a hotspot was approaching the southern triple junction from the west. The hotspot crossed to the Nazca plate ∼1.25Ma. Dietz seamount formed within the young spreading center, dikes intruded Dietz rift basin, and eruptions built volcanic ridges. Since ∼0.8Ma magmatic spreading has jumped northward twice, most recently to Dietz volcanic ridge. Amagmatic extension to the east has formed the large North scarp of Dietz rift basin. Northward jumping of the southern triple junction has maintained the microplate boundary close to the proposed hotspot.
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DOI: --
发表时间: 1980
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作者:
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发表时间: 1992
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