Article
Geochemistry & Geophysics
Marc C. Halfar, Bradley J. Peters, James M. D. Day, Maria Schonbachler
Summary: The Mascarene Islands in the western Indian Ocean are surface expressions of the Reunion hotspot. The lavas from these islands have uniform isotopic composition and may have contributions from different sources. The lavas from Rodrigues Island may contain a unique component that is not found in other islands.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Geochemistry & Geophysics
M. -T. Herret, B. J. Peters, D. Kim, P. R. Castillo, A. Mundl-Petermeier
Summary: The short-lived radiogenic 182Hf/182W and 146Sm/142Nd systems provide useful information on differentiation processes in Earth's early history. This study focuses on the Marquesas Archipelago hotspot and investigates the presence of negative μ182W anomalies in plume-derived ocean island basalts (OIB). Despite elevated 3He/4He ratios, there were no anomalous μ182W and μ142Nd measurements, suggesting the absence of ULVZ involvement in the plume's melting region and supporting the hypothesis that the expression of ancient mantle domains in hotspot geochemistry is temporally variable.
Article
Multidisciplinary Sciences
J. Gregory Shellnutt, Jaroslav Dostal, Tung-Yi Lee
Summary: During the Triassic period, the volcanic rocks of Wrangellia erupted at equatorial to tropical latitudes and may have been associated with a Pacific mantle plume, possibly related to the Galapagos hotspot. Compared to the Caribbean Plateau and Galapagos Islands, the Wrangellia volcanic rocks exhibit similar geological features and thermal conditions.
SCIENTIFIC REPORTS
(2021)
Article
Geochemistry & Geophysics
A. Boyce, R. Kounoudis, I. D. Bastow, S. Cottaar, C. J. Ebinger, C. S. Ogden
Summary: Ethiopia's Cenozoic flood basalt magmatism, uplift, and rifting have been attributed to mantle plumes. However, the movement of the African plate has shifted the mantle beneath it, leading to a lack of knowledge regarding the mantle structure below the northern Tanzania craton and Turkana Depression. Using new seismograph data, a tomographic model is developed to map the mantle structure and reveal the presence of a previously unrecognized mantle plume tail. The thinning lithospheric structure and sub-lithospheric slow wavespeeds in the Turkana Depression suggest that the present-day low elevation is due to crustal thinning.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2023)
Article
Geochemistry & Geophysics
Kevin M. Gaastra, Richard G. Gordon, Daniel T. Woodworth
Summary: The motion of the Pacific plate relative to Pacific hotspots produces age-progressive chains of volcanoes. Analysis of volcano locations and age dates indicate that the motions of the Hawaii, Louisville, and Rurutu hotspots are insignificant. The initiation of the Eocene collision of India with Eurasia preceded the formation of the bends in the Pacific hotspot chains.
Article
Geology
Zhongmin Tao, Aibing Li, Karen M. Fischer
Summary: The presence of localized low-velocity anomalies in the upper mantle beneath the passive Atlantic margin in North America is a puzzling geophysical observation. The anomalies may be caused by the remnant heat from past hotspots or ongoing asthenospheric upwelling. Based on a recent velocity model, new information on the shapes and anisotropic signatures of these anomalies has been revealed, showing that the anomalies are likely consequences of prior hotspot interactions.
Article
Geochemistry & Geophysics
A. Chase, P. Wessel
Summary: This study improves the age-progressive models of eleven Pacific hotspot chains independently of plate motion models. The improved paleolatitude models are determined by incorporating different types of data and provide constraints for future plate and plume motion models.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Article
Geochemistry & Geophysics
Arnab Roy, Dip Ghosh, Nibir Mandal
Summary: This paper investigates the influence of global mantle flow on the instability dynamics of deep-mantle primary plumes. The results show that the global flow acts as a dampening factor, reducing the growth rate of instabilities. Additionally, it is found that an increase in density contrast and viscosity ratio promotes the growth rate of plumes.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
Peng Peng, Huiru Xu, Ross N. Mitchell, Wilson Teixeira, Uwe Kirscher, Zhaoyuan Qin, Elson P. Oliveira, Vicente A. V. Girardi, Chong Wang, Farid Chemale Jr
Summary: This study investigates the relationship between tectonic motion and hotspot activity during the formation of Earth's supercontinent. The findings suggest that subduction-controlled hotspot generation can explain mantle upwelling and the migration of hotspots to the supercontinent formation region.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Biodiversity Conservation
Moses Mulwa, Mike Teucher, Werner Ulrich, Jan Christian Habel
Summary: The study highlights the severe habitat destruction in tropical forests, leading to population declines of forest specialist species. Research in the Taita Hills of southern Kenya shows that typical forest species are mainly found in near-natural forest blocks, with degraded forest patches and plantations having fewer bird populations. Surrounding landscape has minimal impact on local bird species composition.
BIODIVERSITY AND CONSERVATION
(2021)
Article
Geochemistry & Geophysics
Xun Wei, Xue-Fa Shi, Yi-Gang Xu, Paterno R. Castillo, Yan Zhang, Le Zhang, Hui Zhang
Summary: The geochemical and isotopic analysis of lavas from the Southern Wake seamount trail suggest a derivation from partial melting of secondary plume clusters emanating from the top of the Arago mantle plume. Another possibility is that the lavas could have originated from secondary plumelets associated with the Pacific Large Low Shear Velocity Province (LLSVP). The lavas show signatures of FOZO-HIMU-like isotopic compositions, falling within the Arago hotspot field.
Editorial Material
Multidisciplinary Sciences
Linda Nordling
Summary: The viral disease is commonly spread across the continent, yet many countries lack the necessary resources to increase public awareness and provide treatment for patients.
Article
Geochemistry & Geophysics
Caroline R. Soderman, Simon Matthews, Oliver Shorttle, Matthew G. Jackson, Saskia Ruttor, Oliver Nebel, Simon Turner, Christoph Beier, Marc-Alban Millet, Elisabeth Widom, Munir Humayun, Helen M. Williams
Summary: The study investigates the components from the mantle and crust in the sources of ocean island basalts using iron isotope data. The results indicate that heavy iron isotopes are correlated with radiogenic isotope signatures of enriched crustal material, rather than the involvement of the Earth's core. The generation of heavy delta Fe-57 melts in OIB requires various complex processes.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Multidisciplinary Sciences
Stephan Homrighausen, Kaj Hoernle, Folkmar Hauff, Patrick A. Hoyer, Karsten M. Haase, Wolfram H. Geissler, Jorg Geldmacher
Summary: Recent studies reveal that mantle plumes play a crucial role in transferring material and heat from Earth's interior to its surface through multifaceted upwellings. The Tristan-Gough hotspot track, located in the South Atlantic, has provided evidence of spatial geochemical zonation in two distinct sub-tracks since around 70 million years ago. The origin and sudden appearance of these distinct geochemical flavors are still a mystery, but they could offer valuable insights into the structural evolution of mantle plumes.
NATURE COMMUNICATIONS
(2023)
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
C. Ramirez, A. Nyblade, S. E. Hansen, D. A. Wiens, S. Anandakrishnan, R. C. Aster, A. D. Huerta, P. Shore, T. Wilson
GEOPHYSICAL JOURNAL INTERNATIONAL
(2016)
Article
Geochemistry & Geophysics
Xiaolong Ma, Xinlei Sun, Douglas A. Wiens, Lianxing Wen, Andrew Nyblade, Sridhar Anandakrishnan, Rick Aster, Audrey Huerta, Terry Wilson
PHYSICS OF THE EARTH AND PLANETARY INTERIORS
(2016)
Article
Geology
Weisen Shen, Douglas A. Wiens, Tim Stern, Sridhar Anandakrishnan, Richard C. Aster, Ian Dalziel, Samantha Hansen, David S. Heeszel, Audrey Huerta, Andrew Nyblade, Terry J. Wilson, J. Paul Winberry
Article
Geochemistry & Geophysics
C. Ramirez, A. Nyblade, E. L. Emry, J. Julia, X. Sun, S. Anandakrishnan, D. A. Wiens, R. C. Aster, A. D. Huerta, P. Winberry, T. Wilson
GEOPHYSICAL JOURNAL INTERNATIONAL
(2017)
Article
Geochemistry & Geophysics
Weisen Shen, Douglas A. Wiens, Sridhar Anandakrishnan, Richard C. Aster, Peter Gerstoft, Peter D. Bromirski, Samantha E. Hansen, Ian W. D. Dalziel, David S. Heeszel, Audrey D. Huerta, Andrew A. Nyblade, Ralph Stephen, Terry J. Wilson, J. Paul Winberry
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2018)
Article
Geochemistry & Geophysics
Austin L. White-Gaynor, Andrew A. Nyblade, Richard C. Aster, Douglas A. Wiens, Peter D. Bromirski, Peter Gerstoft, Ralph A. Stephen, Samantha E. Hansen, Terry Wilson, Ian W. Dalziel, Audrey D. Huerta, J. Paul Winberry, Sridhar Anandakrishnan
EARTH AND PLANETARY SCIENCE LETTERS
(2019)
Article
Geochemistry & Geophysics
J. P. O'Donnell, G. W. Stuart, A. M. Brisbourne, K. Selway, Y. Yang, G. A. Nield, P. L. Whitehouse, A. A. Nyblade, D. A. Wiens, R. C. Aster, S. Anandakrishnan, A. D. Huerta, T. Wilson, J. P. Winberry
EARTH AND PLANETARY SCIENCE LETTERS
(2019)
Article
Geochemistry & Geophysics
J. P. O'Donnell, A. M. Brisbourne, G. W. Stuart, C. K. Dunham, Y. Yang, G. A. Nield, P. L. Whitehouse, A. A. Nyblade, D. A. Wiens, S. Anandakrishnan, R. C. Aster, A. D. Huerta, A. J. Lloyd, T. Wilson, J. P. Winberry
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2019)
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
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
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
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
Erica M. Lucas, Andrew A. Nyblade, Natalie J. Accardo, Andrew J. Lloyd, Douglas A. Wiens, Richard C. Aster, Terry J. Wilson, Ian W. Dalziel, Graham W. Stuart, John Paul O'Donnell, J. Paul Winberry, Audrey D. Huerta
Summary: In this study, we examined the anisotropy of the upper mantle in the Antarctic continent. The results showed that the fast polarization directions across Antarctica mostly oriented in the NE-SW direction, with a clockwise rotation when moving from west to east. The observed anisotropy is likely a result of regionally variable contributions from both lithospheric and sub-lithospheric mantle sources.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Education & Educational Research
Matthew R. Loeser, Makaylah Newkirk, Kara Gabriel, Audrey D. Huerta
Summary: Through partnerships with various stakeholders, Yakima Valley College has provided students with the opportunity to collaborate with faculty on undergraduate research projects. Assessment data shows high transfer, graduation, and/or continued enrollment rates for research participants, along with increased perceptions of students in thinking and working like scientists.
SPUR-SCHOLARSHIP AND PRACTICE OF UNDERGRADUATE RESEARCH
(2021)
Article
Geochemistry & Geophysics
J. P. O'Donnell, K. Selway, A. A. Nyblade, R. A. Brazier, D. A. Wiens, S. Anandakrishnan, R. C. Aster, A. D. Huerta, T. Wilson, J. P. Winberry
EARTH AND PLANETARY SCIENCE LETTERS
(2017)