scholarly journals Oceanic plateau of the Hawaiian mantle plume head subducted to the uppermost lower mantle

Science ◽  
2020 ◽  
Vol 370 (6519) ◽  
pp. 983-987
Author(s):  
Songqiao Shawn Wei ◽  
Peter M. Shearer ◽  
Carolina Lithgow-Bertelloni ◽  
Lars Stixrude ◽  
Dongdong Tian
Keyword(s):  
Mantle Plume ◽  
Lower Mantle ◽  
Hot Spot ◽  
Oceanic Plateau ◽  
Seismic Waveforms ◽  
Hawaiian Plume ◽  
Plate Reconstructions ◽  
History Of ◽  
Seamount Chain ◽  
Initiation Stage

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.

scholarly journals Oceanic plateau of the Hawaiian mantle plume head subducted to the uppermost lower mantle

2021 ◽  
Author(s):  
Songqiao Shawn Wei ◽  
Peter Shearer ◽  
Carolina Lithgow-Bertelloni ◽  
Lars Stixrude ◽  
Dongdong Tian
Keyword(s):  
Mantle Plume ◽  
Lower Mantle ◽  
Oceanic Plateau ◽  
Seismic Waveforms ◽  
Hawaiian Plume ◽  
Plate Reconstructions ◽  
History Of ◽  
Temporal And Spatial ◽  
Seamount Chain ◽  
Initiation Stage

<p>The Hawaiian-Emperor seamount chain that includes the Hawaiian volcanoes is 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 hotspot, 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 <em>SS </em>precursors. We propose that this thick crust represents a major part of the oceanic plateau that was created by the Hawaiian plume head about 100 Ma ago and subducted 20–30 Ma ago. Our discovery provides temporal and spatial clues of the early history of the Hawaiian plume for future plate reconstructions.</p>

scholarly journals Identification and Characterization of a Novel clcn7 Variant Associated With Osteopetrosis

2020 ◽  
Author(s):  
Dmitrii S. Bug ◽  
Ildar M. Barkhatov ◽  
Yana V. Gudozhnikova ◽  
Artem V. Tishkov ◽  
Natalia V. Petukhova ◽  
...  
Keyword(s):  
Structure Analysis ◽  
Evolutionary History ◽  
Hot Spot ◽  
Phylogenetic Reconstruction ◽  
Novel Variant ◽  
Uncertain Significance ◽  
Precise Diagnosis ◽  
History Of ◽  
Identification And Characterization

Osteopetrosis is a group of rare inheritable disorders of the skeleton characterized by increased bone density. The disease is remarkably heterogeneous in clinical presentation and often misdiagnosed. Therefore, genetic testing and molecular pathogenicity analysis are essential for precise diagnosis and new targets for preventive pharmacotherapy. Mutations in the CLCN7 gene give rise to the complete spectrum of osteopetrosis phenotypes and are responsible for about 75% of cases of autosomal dominant osteopetrosis. In this study, we report the identification of a novel variant in the CLCN7 gene in a patient diagnosed with osteopetrosis and provide evidence for its significance (likely deleterious) based on extensive comparative genomics, protein sequence and structure analysis. A set of automated bioinformatics tools used to predict consequences of this variant identified it as deleterious or pathogenic. Structure analysis revealed that the variant is located at the same “hot spot” as the most common CLCN7 mutations causing osteopetrosis. Deep phylogenetic reconstruction showed that not only Leu614Arg, but any non-aliphatic substitutions in this position are evolutionarily intolerant, further supporting the deleterious nature of the variant. The present study provides further evidence that reconstructing a precise evolutionary history of a gene helps predicting phenotypical consequences of variants of uncertain significance.

scholarly journals Pervasive mantle plume head heterogeneity: Evidence from the late Cretaceous Caribbean-Colombian oceanic plateau

2002 ◽  
Vol 107 (B7) ◽  
pp. ECV 2-1-ECV 2-13 ◽  
Author(s):  
Andrew C. Kerr ◽  
John Tarney ◽  
Pamela D. Kempton ◽  
Piera Spadea ◽  
Alvaro Nivia ◽  
...  
Keyword(s):  
Mantle Plume ◽  
Late Cretaceous ◽  
Oceanic Plateau

Lower-mantle plume beneath the Yellowstone hotspot revealed by core waves

2018 ◽  
Vol 11 (4) ◽  
pp. 280-284 ◽  
Author(s):  
Peter L. Nelson ◽  
Stephen P. Grand
Keyword(s):  
Mantle Plume ◽  
Lower Mantle ◽  
Yellowstone Hotspot

An isotopically depleted lower mantle component is intrinsic to the Hawaiian mantle plume

2019 ◽  
Vol 12 (6) ◽  
pp. 487-492 ◽  
Author(s):  
C. DeFelice ◽  
S. Mallick ◽  
A. E. Saal ◽  
S. Huang
Keyword(s):  
Mantle Plume ◽  
Lower Mantle ◽  
Mantle Component

scholarly journals The Origin and Evolution of Pacific Island Biotas, New Guinea to Eastern Polynesia: Patterns and Processes

1997 ◽  
Vol 3 (4) ◽  
pp. 408
Author(s):  
Jonathan D. Majer
Keyword(s):  
Cultural History ◽  
Hot Spot ◽  
New Guinea ◽  
Origin And Evolution ◽  
The Pacific ◽  
History Of ◽  
Number Of Publications ◽  
Patterns And Processes ◽  
The Relationship ◽  
The Tropical Pacific

A number of publications have considered the biogeography of various subsets of the Pacific Region, including the earlier works by J. L. Gressitt (Pacific Basin Biogeography) and by F. J. Radovsky and others (Biogeography of the Tropical Pacific). In addition to these, substantial edited volumes have been produced on the Biogeography and Ecology of New Guinea (by J. L. Gressitt), on Biogeography and Ecology in Australia (by A. Keast), on the relationship between these two regions in Bridge and Barrier: The Natural and Cultural History of the Torres Strait (by D. Walker) and on Hawaiian Biogeography: Evolution of a Hot Spot Archipelago (by W. L. Wagner and V. A. Funk). A substantial list of papers, reviews and symposia also pertain to the biogeography of this region.

scholarly journals Plate reconstructions and tomography reveal a fossil lower mantle slab below the Tasman Sea

2009 ◽  
Vol 278 (3-4) ◽  
pp. 143-151 ◽  
Author(s):  
W.P. Schellart ◽  
B.L.N. Kennett ◽  
W. Spakman ◽  
M. Amaru
Keyword(s):  
Lower Mantle ◽  
Tasman Sea ◽  
Plate Reconstructions
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