Article
Geosciences, Multidisciplinary
Dapeng Zhao
Summary: Recent studies on seismic imaging of the Northwest Pacific and East Asian region have revealed significant lateral heterogeneities in the crust and upper mantle, shedding new light on various geological processes such as volcanism, earthquake mechanisms, and mantle dynamics. Significant advancements in seismic imaging techniques, particularly tomographic inversions for 3-D distribution of seismic anisotropy and attenuation, have provided important insights into lithospheric deformation, mantle convection, and the processes associated with plate subductions.
EARTH-SCIENCE REVIEWS
(2021)
Article
Geochemistry & Geophysics
Yanghui Zhao, Bryan Riel, Gillian Foulger, Weiwei Ding
Summary: In this study, Gaussian Process regression was used to reconstruct the seamount topography in the Pacific plate, revealing that previous estimates of erupted volumes were significantly underestimated. The study concludes that shallow processes rather than deep processes dominate the formation of seamounts, with proposed plumes contributing only a minority of the total intraplate volcanism in the Pacific plate.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Geochemistry & Geophysics
Tao Xu, Yinshuang Ai, Chenglong Wu, Ling Chen, Enbo Fan, Long Li, Weiyu Dong
Summary: By quantifying the shear wave splitting parameters captured by three seismic arrays in Northeast China, we studied the origin of intraplate volcanism and found a toroidal pattern of anisotropy beneath the Songliao Basin. The high-density seismic array revealed that the Pacific subduction and lithospheric foundering processes controlled the genesis of late Cenozoic volcanism in Northeast China.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Multidisciplinary Sciences
Charlotte L. DeVitre, Esteban Gazel, Ricardo S. Ramalho, Swetha Venugopal, Matthew Steele-MacInnis, Junlin Hua, Chelsea M. Allison, Lowell R. Moore, Juan Carlos Carracedo, Brian Monteleone
Summary: Constraining the volatile content of magmas is crucial for understanding eruptive processes and the deep Earth cycling. However, most studies on magmatic volatiles have focused on their cycling through subduction zones, while research on intraplate mafic volcanism is limited. This study analyzes melt inclusion data from Fogo volcano in Cabo Verde and suggests that oceanic intraplate silica-undersaturated explosive eruptions have volatile-rich sources.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Geochemistry & Geophysics
Xin Liu, Dapeng Zhao
Summary: By using a new method of jointly inverting seismic data, a new 3-D shear wave velocity (V-s) model beneath the Cape Verde hotspot down to 400 km depth has been determined, revealing two V-s discontinuities at depths of around 15 and 60 km beneath volcanic islands. High-V-s anomalies in the uppermost mantle beneath the Atlantic Ocean and low-V-s anomalies beneath volcanic islands suggest a plume-modified lithosphere-asthenosphere system beneath the hotspot.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geology
L. Buff, M. G. Jackson, K. Konrad, J. G. Konter, M. Bizimis, A. Price, E. F. Rose-Koga, J. Blusztajn, A. A. P. Koppers, Santiago Herrera
Summary: The Cook-Austral volcanic lineament in the South Pacific Ocean is characterized by hotspot-related volcanic islands formed by multiple mantle plumes. This study suggests that the Arago and Macdonald hotspots have been active for at least 70 million years and extends into the Cretaceous-aged island chains. New evidence from seamounts and atolls supports the age progression theory of the Arago and Macdonald hotspot tracks.
Article
Geochemistry & Geophysics
Mike W. Jansen, Jonas Tusch, Carsten Muenker, Alessandro Bragagni, Riccardo Avanzinelli, Filippo Mastroianni, Finlay M. Stuart, Florian Kurzweil
Summary: Several studies have found small heterogeneities in the relative abundance of 182W, the radiogenic nuclide of short-lived 182Hf, in terrestrial rocks. The origin of this anomaly is still unclear, with proposed models focusing on core-mantle interaction or the presence of isolated reservoirs in the lower mantle. By comparing intraplate basalts in different regions, researchers discovered that there is generally a lack of 182W anomalies in European mantle-related basalts.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Geology
Muchen Sun, Youqiang Yu, Stephen S. Gao, Kelly H. Liu
Summary: A study has found a significant thinning of the mantle transition zone extending from central Honshu, Japan, to the Korean Peninsula, supporting the existence of a slab tear. The results also suggest that hot mantle material may flow through the tear and contribute to surface volcanism.
Article
Geochemistry & Geophysics
Haruka Nagai, Nozomu Takeuchi, Hitoshi Kawakatsu, Hajime Shiobara, Takehi Isse, Hiroko Sugioka, Aki Ito, Hisashi Utada
Summary: This article presents a method for inverting the seismic structures of the oceanic lithosphere-asthenosphere system, which is crucial for understanding plate tectonics. By combining envelope-fitting and waveform inversion techniques, the study successfully obtained a continuous structure model from the crust to the asthenosphere, improving the resolution in the asthenosphere.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
Nghiem Van Dao, Hiroshi Kitagawa, Eizo Nakamura, Katsura Kobayashi, Thanh Xuan Ngo, Son Hai Trinh
Summary: Vietnam is a major area of volcanic activity in Southeast Asia. This study presents new geochronological and geochemical data for Cenozoic basalts in Vietnam to provide constraints on their origin. The results show chemically distinct sources of basalts in Central and Southern Vietnam, with a clear boundary at 13.5 degrees N. The basalts north of the boundary have isotopic features similar to Enriched Mantle type 2 (EM2) ocean island basalts, while the basalts south of the boundary have isotopic features similar to Enriched Mantle type 1 (EM1) ocean island basalts. These features suggest that the sources of the basalts are generated through the recycling of deeply-subducted crustal lithologies. The subduction of dense oceanic lithosphere can also induce a convecting cell in the upper mantle. Therefore, the different chemistries of basalts in Central and Southern Vietnam represent the surface expression of melting in two different convecting cells, driven by subduction of the Pacific plate and the Indo-Australian plate, respectively.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
Celia L. Eddy, Goran Ekstrom, Meredith Nettles
Summary: This study presents a new 3-D model of seismic velocity and anisotropy in the Pacific upper mantle, PAC13E. The research finds strong radial and azimuthal anisotropy in the lithosphere, with different alignment patterns in the lithosphere and asthenosphere. Additionally, the presence of shear in the asthenosphere not aligned with absolute-plate-motion directions is observed.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
Francois J. P. Lotter, Nils Lenhardt, Lothar Viereck, Carsten Munker, Chris S. Marien, Mohammed A. H. Altigani
Summary: The Holocene Bayuda Monogenetic Volcanic Field in Sudan is characterized by basanitic to hawaiitic volcanic rocks, indicating it is a sodic-alkaline volcanic field. Petrographic evidence shows that olivine and clinopyroxene are the main fractionating phases, and there are processes of assimilation, mingling, and mixing. Trace element variations distinguish two primary magmas, and the isotopic characteristics suggest a metasomatised lithospheric mantle source. The presence of high radiogenic Pb implies that the genesis of this volcanic field is not related to the Afar plume event or magmatism along the Ethiopian and Red Sea Rifts.
Article
Geology
Robert Pockalny, Ginger Barth, Barry Eakins, Katherine A. Kelley, Christina Wertman
Summary: Researchers have developed a new model to explain the spatial and temporal history of the Line Islands system by combining plate-tectonic reconstructions, seamount age dates, and available geochemistry. The model identifies a new melt source region at similar to 17 degrees S, similar to 125 degrees W, which contributed to the formation of the Line Islands, Mid-Pacific Mountains, and possibly the Pukapuka Ridge.
Article
Geochemistry & Geophysics
Chiara Civiero, Sergei Lebedev, Nicolas L. Celli
Summary: Hot plumes rising from Earth's deep mantle can cause uplift, rifting, and the formation of large igneous provinces (LIP). Through new technology, researchers have discovered hot, partially molten rock corridors in the East Africa-Arabia region, which are fed by three mantle upwellings. This suggests that complex-shaped plume heads can explain the scattered volcanism in broad areas and may be an inherent feature of plume-continent interaction.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Article
Geosciences, Multidisciplinary
Andreas Kluegel, Elmar Albers, Thor H. Hansteen
Summary: The occurrence of mantle-derived peridotite xenoliths in phonolitic melts is a rare phenomenon. A unique tephriphonolite lava from Cumbre Vieja volcano in La Palma provides evidence that xenoliths are transported into evolving phonolite melts by mafic magmas. Petrological investigations show that the tephriphonolite magma was stored in the lower crust at high temperatures and oxidized conditions. The peridotite xenoliths had contact with alkaline melts for several decades to centuries before being entrained in the final ascent of the lava.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Astronomy & Astrophysics
Y. Ricard, D. Bercovici, F. Albarede
Article
Geochemistry & Geophysics
David Bercovici, Philip Skemer
JOURNAL OF GEODYNAMICS
(2017)
Article
Geochemistry & Geophysics
Elvira Mulyukova, David Bercovici
PHYSICS OF THE EARTH AND PLANETARY INTERIORS
(2017)
Article
Geochemistry & Geophysics
Elvira Mulyukova, David Bercovici
EARTH AND PLANETARY SCIENCE LETTERS
(2018)
Article
Geochemistry & Geophysics
David Bercovici, Elvira Mulyukova, Maureen D. Long
JOURNAL OF GEODYNAMICS
(2019)
Article
Geosciences, Multidisciplinary
Yang Liao, David Bercovici, Mark Jellinek
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
(2018)
Article
Geochemistry & Geophysics
Ashley Bellas, Shijie Zhong, David Bercovici, Elvira Mulyukova
PHYSICS OF THE EARTH AND PLANETARY INTERIORS
(2018)
Article
Geography, Physical
Fabian Lindner, Gabi Laske, Fabian Walter, Adrian K. Doran
ANNALS OF GLACIOLOGY
(2019)
Article
Geochemistry & Geophysics
A. K. Doran, G. Laske
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2019)
Article
Geochemistry & Geophysics
S. Pachhai, G. Masters, G. Laske
GEOPHYSICAL JOURNAL INTERNATIONAL
(2020)
Article
Astronomy & Astrophysics
A. K. Doran, M. Rapa, G. Laske, J. Babcock, S. McPeak
EARTH AND SPACE SCIENCE
(2019)
Article
Geochemistry & Geophysics
A. K. Doran, G. Laske
Summary: The study reveals the heterogeneity of crustal and uppermost mantle structure beneath the Hawaiian Swell and surrounding region, including varying thickness of crystalline crust and velocity anomalies in the upper mantle. These geological structures may be related to volcanic activity in Hawaii and plate tectonics.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Adam T. Ringler, David B. Mason, Gabi Laske, Tyler Storm, Mary Templeton
Summary: Seismic instruments are highly sensitive to various Earth signals, making them prone to failures, both obvious and subtle. This work documents different failure modes where ground-motion data can no longer be faithfully recorded. While some failures render data completely unusable, others still allow for certain applications.
SEISMOLOGICAL RESEARCH LETTERS
(2021)
Article
Geosciences, Multidisciplinary
Gabi Laske
Summary: This study documents the observation of Earth's normal modes on ocean bottom seismometers, especially at periods longer than 500 s. The findings suggest that investing in high-quality seismic sensors is crucial for observing these signals effectively.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Geography, Physical
Fabian Lindner, Fabian Walter, Gabi Laske, Florent Gimbert