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
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
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
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
Geochemistry & Geophysics
C. Rasoazanamparany, E. Widom, D. Kuentz, T. Raharimahefa, K. Rakotondravelo, A. M. F. Rakotondrazafy
Summary: Analysis of volcanic rocks and tephra from the Itasy volcanic field in central Madagascar reveals geochemical characteristics similar to ocean island basalts, with significant geochemical and isotopic heterogeneity, likely originating from the mantle. A mixing model suggests that the isotopic composition of Itasy magmas may result from a mixture of multiple mantle sources.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Geosciences, Multidisciplinary
Nina Soager, Paul Martin Holm, Gabriela Isabel Massaferro, Miguel Haller, Marie Katrine Traun
Summary: The study revises the interpretation of mantle sources of volcanism in Patagonia, Argentina, based on an extensive literature dataset. It suggests that the Patagonian basalts were formed by metasomatism of the local lithospheric mantle by carbonatitic melts from the South Atlantic asthenosphere, indicating a young HIMU source.
Article
Geochemistry & Geophysics
Matthew J. Comeau, Michael Becken, Alexander Grayver, Johannes S. Kaeufl, Alexey Kuvshinov
Summary: By analyzing high-resolution magnetotelluric data collected in central Mongolia, the structure of continental intraplate volcanic systems from surface to mantle source is revealed, showing low-resistivity anomalies in the middle-upper crust and lower crust, as well as thermal anomalies and partial melt zones in the mantle. The geophysical models provide insights into the continental intraplate volcanic system, indicating past transient magma pathways in the crust and a common mantle source for the volcanism.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
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
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
Thomas Duvernay, D. Rhodri Davies, Christopher R. Mathews, Angus H. Gibson, Stephan C. Kramer
Summary: This study investigates the mechanisms behind intraplate volcanism on Earth, indicating the impact of processes such as edge-driven convection and shear-driven upwelling. Simulation experiments demonstrate the sensitivity of these processes to lithospheric changes and the spatiotemporal characteristics of volcanic activities.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)
Review
Geosciences, Multidisciplinary
Aubreya Adams
Summary: The Cameroon Volcanic Line (CVL) of west Africa, which exhibits asynchronous volcanism along the line, poses challenges to common models of mantle processes and volcanic system genesis. Geophysical studies have been conducted to understand the complex geology of the region and potential geodynamic models for the CVL formation.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geochemistry & Geophysics
P. W. Ball, K. Czarnota, N. J. White, M. Klocking, D. R. Davies
Summary: The study aims to understand the upper mantle structure through analyzing volcanic rocks in eastern Australia. Results suggest that volcanic activity in the region may be caused by the passage of mantle plumes, leading to significantly higher mantle temperatures, thinning lithosphere, and uplift of the Eastern Highlands.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)
Article
Geochemistry & Geophysics
C. Rasoazanamparany, E. Widom, D. Kuentz, T. Raharimahefa, A. M. F. Rakotondrazafy, K. M. Rakotondravelo
Summary: This study focuses on the basaltic lavas from the Southwest Ankaratra volcanic field in the central highlands of Madagascar. The research involves various analyses including 40Ar/39Ar dating, major and trace element studies, and Sr, Nd, Pb, Hf, Os isotopic studies. The results reveal significant chemical and isotopic heterogeneity among the Southwest Ankaratra magmas, suggesting different geochemical groups within the Quaternary Ankaratra magmas.
Article
Geochemistry & Geophysics
O. E. McLeod, M. Brenna, R. M. Briggs, A. Pittari
Summary: The coexistence of coeval arc and intraplate basaltic magmas in the Alexandra Volcanic Group of North Island, New Zealand, provides insights into the relationship between back-arc volcanism and the mixing of arc and intraplate sources. A comprehensive suite of new elemental and isotope geochemical data, combined with detailed stratigraphic analysis, reveal the cyclical contamination of arc magmas by deeper set intraplate sources. The study suggests that trough-normal slab tear has facilitated the vertical and lateral ascension of asthenosphere into the mantle wedge, causing decompression melting to form intraplate basalts, and triggering secondary melting of the wedge to generate arc basalts.
Article
Geochemistry & Geophysics
Anqi Zhang, Zhen Guo, Hongkun Dai, Yingjie Yang
Summary: The Eastern South China Block has experienced complex tectonism and volcanism, and this study provides a comprehensive understanding of its thermochemical structure using geophysical data. The lithosphere is found to be thinned in the eastern SCB, with variations in composition. High-temperature anomalies are associated with plate subduction and mantle plumes. The ongoing lithospheric modification and intraplate volcanism are influenced by partial melting in the asthenosphere. The composition and evolution of intraplate volcanism in the eastern SCB are controlled by the lithospheric thickness and its thermochemical state.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geochemistry & Geophysics
Jie Chen, Yongshun John Chen, Douglas A. Wiens, S. Shawn Wei, Yang Zha, Jordi Julia, Chen Cai
Article
Geochemistry & Geophysics
A. J. Lloyd, D. A. Wiens, H. Zhu, J. Tromp, A. A. Nyblade, R. C. Aster, S. E. Hansen, I. W. D. Dalziel, T. J. Wilson, E. R. Ivins, J. P. O'Donnell
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2020)
Article
Geosciences, Multidisciplinary
Yantao Luo, Douglas A. Wiens
GEOPHYSICAL RESEARCH LETTERS
(2020)
Article
Geosciences, Multidisciplinary
J. Paul Winberry, Audrey D. Huerta, Sridhar Anandakrishnan, Richard C. Aster, Andrew A. Nyblade, Douglas A. Wiens
GEOPHYSICAL RESEARCH LETTERS
(2020)
Article
Geochemistry & Geophysics
S. Shawn Wei, Douglas A. Wiens
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2020)
Article
Geochemistry & Geophysics
Melody Eimer, Douglas A. Wiens, Chen Cai, Daniel Lizarralde, Hope Jasperson
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2020)
Article
Geology
Erica L. Emry, Andrew A. Nyblade, Alan Horton, Samantha E. Hansen, Jordi Julia, Richard C. Aster, Audrey D. Huerta, J. Paul Winberry, Douglas A. Wiens, Terry J. Wilson
Article
Geosciences, Multidisciplinary
Weisen Shen, Douglas A. Wiens, Andrew J. Lloyd, Andrew A. Nyblade
GEOPHYSICAL RESEARCH LETTERS
(2020)
Article
Geochemistry & Geophysics
Erica M. Lucas, David Soto, Andrew A. Nyblade, Andrew J. Lloyd, Richard C. Aster, Douglas A. Wiens, John Paul O'Donnell, Graham W. Stuart, Terry J. Wilson, Ian W. Dalziel, J. Paul Winberry, Audrey D. Huerta
EARTH AND PLANETARY SCIENCE LETTERS
(2020)
Article
Geochemistry & Geophysics
C. K. Dunham, J. P. O'Donnell, G. W. Stuart, A. M. Brisbourne, S. Rost, T. A. Jordan, A. A. Nyblade, D. A. Wiens, R. C. Aster
GEOPHYSICAL JOURNAL INTERNATIONAL
(2020)
Article
Geography, Physical
Michael G. Baker, Richard C. Aster, Douglas A. Wiens, Andrew Nyblade, Peter D. Bromirski, Peter Gerstoft, Ralph A. Stephen
Summary: Observations of teleseismic earthquakes using broadband seismometers on the Ross Ice Shelf reveal seasonal and geographic variations in signal-to-noise ratios, accurate estimation of ice and water layer thicknesses, and observations consistent with theoretically predicted phenomena, suggesting that teleseismic coda can be utilized for passive imaging of sub-shelf Earth structure.
JOURNAL OF GLACIOLOGY
(2021)
Article
Geochemistry & Geophysics
Grace Barcheck, Geoffrey A. Abers, Aubreya N. Adams, Anne Becel, John Collins, James B. Gaherty, Peter J. Haeussler, Zongshan Li, Ginevra Moore, Evans Onyango, Emily Roland, Daniel E. Sampson, Susan Y. Schwartz, Anne F. Sheehan, Donna J. Shillington, Patrick J. Shore, Spahr Webb, Douglas A. Wiens, Lindsay L. Worthington
SEISMOLOGICAL RESEARCH LETTERS
(2020)
Article
Geochemistry & Geophysics
Erica M. Lucas, Andrew A. Nyblade, Andrew J. Lloyd, Richard C. Aster, Douglas A. Wiens, John Paul O'Donnell, Graham W. Stuart, Terry J. Wilson, Ian W. D. Dalziel, J. Paul Winberry, Audrey D. Huerta
Summary: A total of 117 previously undetected seismic events in central West Antarctica have been identified, originating from glacial, tectonic, and volcanic processes. The uppermost portion of the mantle beneath central West Antarctica shows laterally variable structure, with implications for geothermal heat flux and glacial isostatic adjustment spatial patterns. The discoveries in this study have significant implications for understanding the dynamics and evolution of the West Antarctic Ice Sheet.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)
Article
Geochemistry & Geophysics
Richard C. Aster, Bradley P. Lipovsky, Hank M. Cole, Peter D. Bromirski, Peter Gerstoft, Andrew Nyblade, Douglas A. Wiens, Ralph Stephen
Summary: The interaction between ocean swell and Antarctic ice shelves results in sustained gravity-elastic perturbations with deformation amplitudes near the ice front. These perturbations are most active during the austral summer, with dominant frequency content between 0.5 and 20 Hz and highly repetitive waveforms.
SEISMOLOGICAL RESEARCH LETTERS
(2021)
Article
Geosciences, Multidisciplinary
Gaohua Zhu, Douglas A. Wiens, Hongfeng Yang, Jian Lin, Min Xu, Qingyu You
Summary: Seismic imaging methods were used to study the SV-wave velocity structure near the Southern Mariana Trench, revealing extensive mantle hydration of the incoming plate and differences in forearc serpentinization between southern and central Mariana.
GEOPHYSICAL RESEARCH LETTERS
(2021)