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Oceanic plateau of the Hawaiian mantle plume head subducted to the uppermost lower mantle
Science ( IF 44.7 ) Pub Date : 2020-11-19 , DOI: 10.1126/science.abd0312
Songqiao Shawn Wei 1 , Peter M. Shearer 2 , Carolina Lithgow-Bertelloni 3 , Lars Stixrude 3 , Dongdong Tian 1
Affiliation  

Finding the Emperor's head Volcanic island and seamount chains form from deep-seated plumes of hot material upwelling through the mantle. The most famous of these is the Hawaiian-Emperor seamount chain. However, a large volcanic structure associated with a plume head that should precede the chain has long been missing. Wei et al. finally identified the likely location of this structure in the mantle under eastern Russia. The structure was likely subducted 20 million to 30 million years ago, and the location helps constrain several geodynamic processes. Science, this issue p. 983 The plume head of the Hawaiian-Emperor volcano seamount chain was subducted into Earth’s mantle 20 million to 30 million years ago. The Hawaiian-Emperor seamount chain that includes the Hawaiian volcanoes was created by the Hawaiian mantle plume. Although the mantle plume hypothesis predicts an oceanic plateau produced by massive decompression melting during the initiation stage of the Hawaiian hot spot, the fate of this plateau is unclear. We discovered a megameter-scale portion of thickened oceanic crust in the uppermost lower mantle west of the Sea of Okhotsk by stacking seismic waveforms of SS precursors. We propose that this thick crust represents a major part of the oceanic plateau that was created by the Hawaiian plume head ~100 million years ago and subducted 20 million to 30 million years ago. Our discovery provides temporal and spatial clues of the early history of the Hawaiian plume for future plate reconstructions.

中文翻译:

夏威夷地幔柱头的大洋高原俯冲到最上层的下地幔

寻找帝皇的头颅 火山岛和海山链由地幔深处的热物质羽流形成。其中最著名的是夏威夷-皇帝海山链。然而,长期以来一直缺少与应该在该链之前的羽状头部相关的大型火山结构。魏等人。最终确定了该结构在俄罗斯东部地幔中的可能位置。该结构可能在 2000 万至 3000 万年前俯冲,该位置有助于限制几个地球动力学过程。科学,这个问题 p。983 夏威夷-皇帝火山海山链的羽流头部在 2000 万至 3000 万年前俯冲到地幔中。包括夏威夷火山在内的夏威夷-皇帝海山链是由夏威夷地幔柱形成的。尽管地幔柱假说预测了在夏威夷热点形成阶段由大规模减压融化产生的海洋高原,但该高原的命运尚不清楚。我们通过叠加 SS 前兆的地震波形,在鄂霍次克海以西的最上层下地幔中发现了一块兆米级的加厚洋壳。我们认为,这个厚厚的地壳代表了大约 1 亿年前由夏威夷羽流头形成并在 2000 万到 3000 万年前俯冲的海洋高原的主要部分。我们的发现为未来板块重建提供了夏威夷羽流早期历史的时空线索。这个高原的命运尚不清楚。我们通过叠加 SS 前兆的地震波形,在鄂霍次克海以西的最上层下地幔中发现了一块兆米级的加厚洋壳。我们认为,这个厚厚的地壳代表了大约 1 亿年前由夏威夷羽流头形成并在 2000 万到 3000 万年前俯冲的海洋高原的主要部分。我们的发现为未来板块重建提供了夏威夷羽流早期历史的时空线索。这个高原的命运尚不清楚。我们通过叠加 SS 前兆的地震波形,在鄂霍次克海以西的最上层下地幔中发现了一块兆米级的加厚洋壳。我们认为,这个厚厚的地壳代表了大约 1 亿年前由夏威夷羽流头形成并在 2000 万到 3000 万年前俯冲的海洋高原的主要部分。我们的发现为未来板块重建提供了夏威夷羽流早期历史的时空线索。我们认为,这个厚厚的地壳代表了大约 1 亿年前由夏威夷羽流头形成并在 2000 万到 3000 万年前俯冲的海洋高原的主要部分。我们的发现为未来板块重建提供了夏威夷羽流早期历史的时空线索。我们认为,这个厚厚的地壳代表了大约 1 亿年前由夏威夷羽流头形成并在 2000 万到 3000 万年前俯冲的海洋高原的主要部分。我们的发现为未来板块重建提供了夏威夷羽流早期历史的时空线索。
更新日期:2020-11-19
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