New insights into the age and origin of two small Cretaceous seamount chains proximal to the Northwestern Hawaiian Ridge
New insights into the age and origin of two small Cretaceous seamount chains proximal to the Northwestern Hawaiian Ridge
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对靠近西北夏威夷海脊的两个小型白垩纪海山链的年龄和起源的新见解
DOI：
10.1130/ges02580.1
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发表时间：
2023
期刊：
影响因子：
2.5
通讯作者：
Raineault, Nicole
中科院分区：
文献类型：
--
作者：
Sotomayor, Arturo;Balbas, Andrea;Konrad, Kevin;Koppers, Anthony A.P.;Konter, Jasper G.;Wanless, V. Dorsey;Hourigan, Thomas F.;Kelley, Christopher;Raineault, Nicole
西北夏威夷海岭是一个源自夏威夷地幔柱的年龄递进火山链。夏威夷海脊西北部附近有几组较小的海山和海脊，年龄限制有限，地球动力学起源不明。这项研究提供了新的测深数据和40 Ar/39 Ar年龄测定结果，这些数据来自遥控潜水器从Phāhonu和Moanamana火山以北两个东西走向的海山链采集的熔岩流样品。以前未被探索的奈非链（28°48′N，167°48′W）和普卢梅里亚链（25°36′N，164°35′W）各有五个火山结构，包括奈非链中的三个盖奥特。新的40 Ar/39 Ar年龄测定表明，Naifeh链形成于约1000年。88 Ma and the Plumeria Chain ca. 85 Ma.白垩纪的年龄，再加上垂直方向的海山相对于绝对太平洋板块运动在当时，消除了中新世夏威夷火山拱或白垩纪地幔柱的起源。海山位于洋壳之上，据模拟，洋壳比相应海山的年龄大10-15 Ma。在这里，提出了两种模式来解释这些神秘的海山链以及附近类似的门德尔松海山的起源。(1)岩石圈扩散伸展导致了这些海山的形成，直到84-79 Ma在北部的库拉-太平洋扩张中心开始，这加剧了张力。(2)剪切驱动下的年轻的海洋岩石圈下的富集地幔物质的上涌的结果在年龄渐进的海山轨迹，是近似垂直于扩张脊。在这里，我们表明，所有采样海山接近西北夏威夷海岭的板内性质，但它们的形成可以归因于羽和板块过程。
The Northwestern Hawaiian Ridge is an age-progressive volcanic chain sourced from the Hawaiian mantle plume. Proximal to the Northwestern Hawaiian Ridge are several clusters of smaller seamounts and ridges with limited age constraints and unknown geodynamic origins. This study presents new bathymetric data and40Ar/39Ar age determinations from lava flow samples recovered by remotely operated vehicle (ROV) from two east–west-trending chains of seamounts that lie north of the Pūhāhonu and Mokumanamana volcanoes. The previously unexplored Naifeh Chain (28°48′N,167°48′W) and Plumeria Chain (25°36′N, 164°35′W) contain five volcanic structures each, including three guyots in the Naifeh Chain. New40Ar/39Ar age determinations indicate that the Naifeh Chain formed ca. 88 Ma and the Plumeria Chain ca. 85 Ma. The Cretaceous ages, coupled with a perpendicular orientation of the seamounts relative to absolute Pacific plate motion at that time, eliminate either a Miocene Hawaiian volcanic arch or Cretaceous mantle-plume origin. The seamounts lie on oceanic crust that is modeled to be 10–15 Ma older than the corresponding seamounts. Here, two models are put forth to explain the origin of these enigmatic seamount chains as well as the similar nearby Mendelssohn Seamounts. (1) Diffuse lithospheric extension results in the formation of these seamounts until the initiation of the Kula-Pacific spreading center in the north at 84–79 Ma, which alleviates the tension. (2) Shear-driven upwelling of enriched mantle material beneath young oceanic lithosphere results in an age-progressive seamount track that is approximately perpendicular to the spreading ridge. Here we show that all sampled seamounts proximal to the Northwestern Hawaiian Ridge are intraplate in nature, but their formations can be attributed to both plume and plate processes.
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作者：
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作者：
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西北夏威夷岭火山熔岩的岩石学、地球化学和年龄
DOI：
--
发表时间：
2015
期刊：
影响因子：
--
作者：
Michael O. Garcia;J. R. Smith;J. Tree;D. Weis;L. Harrison;B. Jicha
通讯作者：
B. Jicha