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
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
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
S. Brown Krein, Z. J. Molitor, T. L. Grove
Summary: The study presents a new algorithm, RevPet, to infer mantle melting conditions based on evolved basalts that have experienced multiphase fractional crystallization. Results show that the average apparent mantle potential temperature of basaltic glasses is around 1322 degrees C with melting pressures of 13 kbars. Variations in ambient MOR T-P are observed, with the estimate that it is generally homogeneous around 1350-1400 degrees C, except near hotspots where T-P can reach approximately 1600 degrees C.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geology
J. M. Kendall, D. Schlaphorst, C. A. Rychert, N. Harmon, M. Agius, S. Tharimena
Summary: Parallel melt accumulation along the Mid-Atlantic Ridge was found, and this may enhance the driving forces of the plates.
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
Pengyuan Guo, Yaoling Niu, Pu Sun, Junjie Zhang, Shuo Chen, Meng Duan, Hongmei Gong, Xiaohong Wang
Summary: The study provides new Sr-Nd-Hf isotopic data on mid-ocean ridge basalts from the Oceanographer and Hayes fracture zones at the Mid-Atlantic Ridge to constrain the nature and origin of upper mantle heterogeneity. The data illustrate that the mantle sources of these lavas comprise three components, including ADM, E-type I, and E-type II components, which explain the contrast in crustal thickness, ridge morphology, and mantle Bouguer anomalies between the two ridge segments.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Geochemistry & Geophysics
Fei Wu, Simon Turner, Kaj Hoernle, Folkmar Hauff, Bruce F. Schaefer, Thomas Kokfelt, Ilya Bindeman
Summary: Stable barium (Ba) isotopes are being used as tracers for the recycling of crustal material into the mantle. Small but significant Ba isotope variations have been found in global MORB, and this study provides new constraints on the Ba isotope composition of the depleted upper mantle and the origin of Ba isotope heterogeneity in MORB. The results indicate that recycled altered oceanic crust and crustal sedimentary materials play important roles in the chemical budget of the upper mantle.
GEOCHIMICA ET COSMOCHIMICA ACTA
(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
D. W. Rees Jones, H. Zhang, R. F. Katz
Summary: Channels at mid-ocean ridges are believed to form through shear flow of partially molten mantle and reactive flow of ascending magma, with their competition being controlled by the orientation of channels with respect to gravity and mantle shear. The addition of horizontal extension favors tabular channel morphology. Reactive flow is dominant deep beneath the ridge axis, while shear-driven instability is confined to the margins of the melting region.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Letter
Geosciences, Multidisciplinary
Ryan Porter, Mary Reid
Summary: The thermal regime of the continental lithosphere in North America was evaluated using seismic observations and lab results to estimate temperatures and lithospheric thickness, as well as predict melt distribution in the upper mantle. Results indicate thinner lithosphere and presence of melt in the western US, while thicker lithosphere with absence of melt is observed in the central and eastern US.
GEOPHYSICAL RESEARCH LETTERS
(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
Geochemistry & Geophysics
Shuo Chen, Pu Sun, Yaoling Niu, Pengyuan Guo, Tim Elliott, Remco C. Hin
Summary: The study reveals significant variations in molybdenum isotopes in mid-ocean ridge basalts, indicating mantle compositional heterogeneity. The variations in Mo isotope compositions are best explained by two-component mixing between incompatible element depleted and enriched endmembers. The findings suggest that recycled oceanic mantle lithosphere metasomatized by low degree melt plays a key role in the formation of source lithologies in the East Pacific Rise.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Geochemistry & Geophysics
Chuanshun Li, Haitao Zhang, Yili Guan, Aimei Zhu, Xuefa Shi
Summary: This study presents new major and trace element as well as Sr-Nd-Pb isotope data for basalts from the South Mid-Atlantic Ridge. The results indicate the presence of Tristan mantle plume materials in the southern SMAR asthenosphere, which has influenced the geochemical compositions of the basalts in this region.
Article
Geochemistry & Geophysics
Haitao Zhang, Quanshu Yan, Chuanshun Li, Xuefa Shi, Yaomin Yang, Guozhi Wang, Qingfeng Hua, Zhiwei Zhu, Hui Zhang, Renjie Zhao
Summary: The study reveals that basalts from the South Mid-Atlantic Ridge contain chemical traces of the Saint Helena hotspot, with its influence extending from approximately 14.2 degrees S to 20.8 degrees S. Material flow from Cardno seamount toward the SMAR system may account for the stronger geochemical signals observed in certain segments along the ridge axes.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Geochemistry & Geophysics
Fabio Crameri, Clinton P. Conrad, Laurent Montesi, Carolina R. Lithgow-Bertelloni
Article
Geochemistry & Geophysics
Joe W. Schools, Laurent G. J. Montesi
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
(2018)
Article
Geochemistry & Geophysics
Kristel Izquierdo, Vedran Lekic, Laurent G. J. Montesi
GEOPHYSICAL JOURNAL INTERNATIONAL
(2020)
Article
Geochemistry & Geophysics
Robert I. Citron, Diogo L. Lourenco, Alfred J. Wilson, Antoniette G. Grima, Scott A. Wipperfurth, Maxwell L. Rudolph, Sanne Cottaar, Laurent G. J. Montesi
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2020)
Editorial Material
Geochemistry & Geophysics
Laurent G. J. Montesi, Steven A. Hauck, David Baratoux, Anni Maattanen, A. Deanne Rogers, Sabine Stanley
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
(2020)
Article
Geosciences, Multidisciplinary
Anna J. P. Guelcher, Taras V. Gerya, Laurent G. J. Montesi, Jessica Munch
Article
Geochemistry & Geophysics
Goeun Ha, Laurent G. J. Montesi, Wenlu Zhu
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2020)
Article
Geochemistry & Geophysics
A. P. Green, L. G. J. Montesi, C. M. Cooper
Summary: The study utilizes simulations to evaluate the effects of tidal heat on Europa's ice shell thickness and formation time. It finds that the thermal equilibrium thickness of the ice shell depends on the imposed tidal flexure strain rate, while the ice lithospheric thickness remains less than 8 km. The findings also suggest rapid whole-shell melting and recrystallization that may contribute to the young surface age of Europa's ice shell.
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
(2021)
Article
Geochemistry & Geophysics
Vladimir Lyakhovsky, Eyal Shalev, Ittai Kurzon, Wenlu Zhu, Laurent Montesi, Nikolai M. Shapiro
Summary: This study proposes a new mechanism explaining the significant reduction in mechanical properties and enhanced attenuation in areas of partially molten rocks. The mechanism involves solid-melt phase transition at thermodynamic equilibrium, where any pressure change causes solidification or melting and modifies the heat balance, leading to energy dissipation and seismic wave attenuation. The predicted values are approximately consistent with large scale seismological observations, indicating that seismic waves are mostly attenuated in Earth's crust and mantle due to the presence of melt.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Editorial Material
Geosciences, Multidisciplinary
Gabriel Filippelli, Lisa Beal, Harihar Rajaram, Amir AghaKouchak, Michael A. Balikhin, Georgia Destouni, Amy East, Claudio Faccenna, Fabio Florindo, Carol Frost, Stephen Griffies, Matthew Huber, Noe Lugaz, Isabelle Manighetti, Laurent Montesi, Benoit Pirenne, Peter Raymond, Sana Salous, Taylor Schildgen, Susan Trumbore, Michael Wysession, Marguerite Xenopoulos, Minghua Zhang
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geochemistry & Geophysics
J. Schools, L. G. J. Montesi
Summary: Research shows that melt from the presumed magma ocean in Io's interior reaches the surface by crossing the thermal lithosphere. Permeability barriers can form when melt crystallization is rapid, hindering melt ascent. The heat pipe model provides a mechanism for melt to travel underground. These heat pipes may change, leading to the formation of new melt conduits.
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
(2022)
Editorial Material
Geochemistry & Geophysics
Laurent G. J. Montesi, Anni Maattanen, A. Deanne Rogers, Bradley J. Thomson
Summary: Peer reviewing is crucial in ensuring that articles published in JGR: Planets are thoroughly vetted and present exciting discoveries or new understanding of the fundamental processes affecting solar system objects. In 2021, JGR: Planets benefited from 951 reviews and the help of 25 guest editors. Scientific publishing is truly a community effort.
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
(2022)
Editorial Material
Geochemistry & Geophysics
Laurent G. J. Montesi, Anni Maeaettaenen, A. Deanne Rogers, Bradley J. Thomson
Summary: Peer review is crucial for ensuring the publication of articles in scientific journals, such as JGR: Planets, that are based on sound scientific principles and cutting-edge techniques and present significant discoveries or new understandings of planetary processes. The journal covers a wide range of geoscience topics, with the only requirement being their relevance to planetary processes. The editorial board and guest editors rely on the expertise of the scientific community to evaluate and improve manuscripts, and they express their deep gratitude to the many scientists who volunteer their time and energy for peer review.
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
(2023)
Article
Geochemistry & Geophysics
Goeun Ha, Laurent G. J. Montesi, Wenlu Zhu
Summary: A study has shown that the position of arc volcanoes may be controlled by the thermal structure of the overriding plate. The development of a back-arc spreading center (BASC) is driven by the migration of the subducting hinge. The distance between the trench and the arc/BASC is generally shorter when the slab has a steep dip angle.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2023)
Article
Astronomy & Astrophysics
Kristel Izquierdo, Vedran Lekic, Laurent G. J. Montesi
Summary: Gravity inversions have made significant contributions to our understanding of planetary body interiors and their formation processes. A novel global gravity inversion algorithm called THeBOOGIe is introduced in this study, which is capable of inferring density anomalies within the crust and mantle of planetary bodies at a global scale. By incorporating Bayesian approach and prior geological/ geophysical information, THeBOOGIe overcomes the non-uniqueness challenge in gravity inversions and accurately detects deep mantle density anomalies. Moreover, it provides complementary information to seismic models by constraining non-spherically symmetric density anomalies.
EARTH AND SPACE SCIENCE
(2023)