Article
Geochemistry & Geophysics
Soumen Mallick, Sophie E. Kuhl, Alberto E. Saal, Emily M. Klein, Wolfgang Bach, Brian D. Monteleone, Joseph S. Boesenberg
Summary: Several geochemical studies have confirmed the presence of compositional and lithological heterogeneities in mid-ocean ridge basalts. While the composition and age of these heterogeneities have been constrained, their origin remains highly debated.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Thomas Theunissen, Ritske S. Huismans, Gang Lu, Nicolas Riel
Summary: The selection of crustal and mantle densities in numerical geodynamic models is traditionally based on convention, which may not accurately reflect observed elevations. This study aims to calibrate densities to fit relative continent/mid-ocean ridge elevations based on observations, providing a reference case for geodynamic modelling. The results suggest that the relative elevation difference between mid-ocean ridges and continents is influenced by crustal density, mantle composition, and lithospheric mantle depletion.
EARTH-SCIENCE REVIEWS
(2022)
Article
Geochemistry & Geophysics
Adina E. Pusok, Richard F. Katz, Dave A. May, Yuan Li
Summary: Geophysical observations at mid-ocean ridges show asymmetry in indicators of magma production and non-monotonic variations in lithosphere-asthenosphere boundary depth. Models incorporating melting-induced buoyancy effects can explain these observations.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geosciences, Multidisciplinary
Yangming Wu, Jie Liao, Jiarong Qing, Yongqiang Shen
Summary: The study investigates the development of subduction in the tectonic setting where mid-ocean ridges and passive continental margins are juxtaposed using a 2-D numerical model. The results reveal three types of oceanic plate subduction: continental margin subduction, ridge-inversed subduction, and a transitional type with double subduction along ridges and margins. The physical parameters that influence the formation of these subduction types are systematically analyzed. The study emphasizes the significance of preexisting weakness along passive margins in promoting subduction development.
Article
Geochemistry & Geophysics
Alessio Sanfilippo, Vincent J. M. Salters, Sergey Y. Sokolov, Alexander A. Peyve, Andreas Stracke
Summary: The upper mantle is a mixture of refractory and recycled crustal domains, with the recycled portions dominating the composition of surface basalts. Hf isotope ratios may provide hints for melting of refractory source materials in basalts, allowing the identification of depleted mantle materials. Basalts from the Arctic Atlantic show high Hf isotope ratios, suggesting a highly depleted asthenospheric mantle source beneath this region.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Geochemistry & Geophysics
Hongda Hao, Ian H. Campbell, Richard J. Arculus, Michael R. Perfit
Summary: The study reveals that most primitive mid-ocean ridge basalts have low platinum-group element content, which may be due to changes in sulfur saturation during ascent from the mantle to the ridge magma chamber. Sulfide saturation status can be determined by changes in Pd content, and frequent small replenishments in the magma chamber help maintain sulfide saturation status.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Geosciences, Multidisciplinary
Yangming Wu, Jie Liao, Feng Guo, Xuan-Ce Wang, Yongqiang Shen
Summary: Through geodynamic modeling, this study reveals that trench-parallel mid-ocean ridge subduction can result in diverse geological evolution, with two distinct types of model evolution and different tectono-magmatic responses. This research helps explain the magmatic evolution and tectonic uplift in the circum-Pacific continental margins.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geochemistry & Geophysics
Catherine A. Rychert, Saikiran Tharimena, Nicholas Harmon, Shunguo Wang, Steven Constable, J. Michael Kendall, Petros Bogiatzis, Matthew R. Agius, David Schlaphorst
Summary: The study reveals evidence of persistent melt in the equatorial Mid-Atlantic Ridge region using ocean bottom seismometer data, which has important implications for plate tectonic theory.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Geochemistry & Geophysics
Kevin Growe, Ingo Grevemeyer, Satish C. Singh, Milena Marjanovic, Emma P. M. Gregory, Cord Papenberg, Venkata Vaddineni, Laura Gomez de la Pena, Zhikai Wang
Summary: Recent studies have challenged the idea that transform zone crust may be magmatically augmented instead of anomalous hydrated lithosphere. Research on the St. Paul fracture zone revealed that the crust along and away from the fracture zone showed almost uniform thickness of 5-6 km, resembling normal oceanic crust.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
Molly Anderson, V. Dorsey Wanless, Michael Perfit, Ethan Conrad, Patricia Gregg, Daniel Fornari, W. Ian Ridley
Summary: Lavas erupted at near-axis seamounts provide insights into mid-ocean ridge mantle heterogeneity and melting processes. The study found highly variable compositions of near-ridge mantle on <1 km scales, with depleted, normal, and enriched basalts present along the chain. The presence of all three lava types along the seamount chain suggests that sub-ridge mantle is more heterogeneous than commonly observed on-axis.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)
Article
Geochemistry & Geophysics
Brian E. Tucholke, Ross Parnell-Turner, Deborah K. Smith
Summary: Magma supply plays a primary role in controlling seafloor morphology of oceanic crust. The study examines the global patterns of morphology on mid-ocean ridge flanks in relation to magma supply and spreading rate. The results demonstrate that morphology becomes more isotropic and irregular with decreasing magma supply. The study also reveals that seismically determined crustal thickness in certain regions includes significant non-magmatic components. The findings have implications for understanding the evolution of oceanic crust.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Engineering, Marine
Tianxiao Ji, Zhigang Zeng
Summary: This paper presents new data on the major elements, trace elements, and Nd-Hf isotopes of south mid-Atlantic ridge (SMAR) MORBs. The geochemical characteristics, including enrichment of fluid-mobile elements and anomalous trace element ratios, suggest that these MORBs have been modified by subduction.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Geochemistry & Geophysics
Haibo Ma, Li-Juan Xu, Ji Shen, Sheng-Ao Liu, Shuguang Li
Summary: This study presents the first chromium stable isotopic data of mid-ocean ridge basalts (MORBs) from different ocean ridges and explores the correlation between chromium isotopes, oxygen fugacity, and crystallization.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Environmental Sciences
Jingxuan Wei, Kathryn L. Gunn, Robert Reece
Summary: This study investigates the spatial distribution of diapycnal mixing in the central South Atlantic thermocline and its drivers using seismic reflection data. The results show that thermocline diffusivities have changed little in this region, but exhibit heterogeneity at mesoscales. The Mid-Atlantic Ridge and near-inertial storms are identified as important drivers of mixing.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Tran Danh Hung, Ting Yang, Ba Manh Le, Youqiang Yu, Mei Xue, Baohua Liu, Chenguang Liu, Jian Wang, Mohan Pan, Phan Thien Huong, Fang Liu, Jason P. Morgan
Summary: The study of crustal thickness and Vp/Vs ratios near an extinct mid-ocean ridge in the South China Sea reveals that as spreading ceased, the oceanic crust abruptly thinned and shifted to an ultraslow accretion style. Abnormally high Vp/Vs ratios indicate the presence of serpentine, suggesting the formation of normal faults and the enhancement of serpentinization along the ridge axis.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geochemistry & Geophysics
Robert A. Dunn
EARTH AND PLANETARY SCIENCE LETTERS
(2015)
Article
Geochemistry & Geophysics
Deborah E. Eason, Robert A. Dunn
EARTH AND PLANETARY SCIENCE LETTERS
(2015)
Article
Geochemistry & Geophysics
Michele Paulatto, Juan Pablo Canales, Robert A. Dunn, Robert A. Sohn
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2015)
Article
Geochemistry & Geophysics
Garrett Ito, Robert Dunn, Aibing Li
GEOPHYSICAL JOURNAL INTERNATIONAL
(2015)
Article
Acoustics
Robert A. Dunn
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2015)
Article
Acoustics
Dana C. Brodie, Robert A. Dunn
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2015)
Article
Multidisciplinary Sciences
S. Shawn Wei, Douglas A. Wiens, Yang Zha, Terry Plank, Spahr C. Webb, Donna K. Blackman, Robert A. Dunn, James A. Conder
Article
Geochemistry & Geophysics
Deborah E. Eason, Robert A. Dunn, J. Pablo Canales, Robert A. Sohn
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2016)
Article
Geology
J. Pablo Canales, Robert A. Dunn, Ryuta Arai, Robert A. Sohn
Article
Geochemistry & Geophysics
Robert A. Dunn, Ryuta Arai, Deborah E. Eason, J. Pablo Canales, Robert A. Sohn
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2017)
Article
Geochemistry & Geophysics
G. Horning, R. A. Sohn, J. P. Canales, R. A. Dunn
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2018)
Article
Geochemistry & Geophysics
Robert A. Dunn, Fernando Martinez, James A. Conder
EARTH AND PLANETARY SCIENCE LETTERS
(2013)
Article
Geochemistry & Geophysics
Yang Zha, Spahr C. Webb, S. Shawn Wei, Douglas A. Wiens, Donna K. Blackman, William Menke, Robert A. Dunn, James A. Conder
EARTH AND PLANETARY SCIENCE LETTERS
(2014)
Article
Geochemistry & Geophysics
Ryuta Arai, Robert A. Dunn
EARTH AND PLANETARY SCIENCE LETTERS
(2014)
Article
Geochemistry & Geophysics
Garrett Ito, Robert Dunn, Aibing Li, Cecily J. Wolfe, Alejandro Gallego, Yuanyuan Fu
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2014)