Article
Geosciences, Multidisciplinary
Jinchang Zhang, Xubo Zhang
Summary: There are two competing hypotheses for the origin of oceanic plateaus: plume versus plate. However, thermodynamic modelling of magmatism at Shatsky Rise in the Pacific Ocean suggests that neither mechanism is sufficient on its own. In fact, interaction between plume and ridge is required to explain the formation of this oceanic plateau.
Article
Geochemistry & Geophysics
Yanming Huang, William W. Sager, Jinchang Zhang, Masako Tominaga, John Greene, Masao Nakanishi
Summary: Shatsky Rise oceanic plateau was formed during a period of frequent geomagnetic polarity reversals, with reconstruction of its tectonic evolution using magnetic anomalies. The study found that linear magnetic anomalies are ubiquitous in the region, suggesting that these volcanic edifices may have formed through spreading similar to mid-ocean ridges.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geosciences, Multidisciplinary
Jennifer E. Georgen, A. Katrina Shotorban
Summary: This study examines how plate boundary processes may have played a role in the formation of Shatsky Rise in the western Pacific Ocean, particularly how spreading center geometry facilitated widespread mantle melting.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geochemistry & Geophysics
Jyun-Nai Wu, Ross Parnell-Turner, Daniel J. Fornari, Natalia Berrios-Rivera, Thibaut Barreyre, Jill M. McDermott
Summary: Fissures and faults in the crust help us understand how plate separation is accommodated by magma and brittle deformation. In a study of the East Pacific Rise, bathymetric data collected by autonomous underwater vehicles and remotely operated vehicles were used to map these features. The findings suggest that faulting plays a minimal role in plate separation compared to dike intrusion causing open cracks. The study also reveals the importance of reactivation of fissures during volcanic eruptions and provides insights into magma dynamics.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2023)
Article
Geochemistry & Geophysics
Shili Liao, Chunhui Tao, Hanjie Wen, Weifang Yang, Jia Liu, John W. Jamieson, Agata Alveirinho Dias, Chuanwei Zhu, Jin Liang, Wei Li, Teng Ding, Xiaohu Li, Huichao Zhang
Summary: Hydrothermal activity on mid-ocean ridges plays an important role in delivering zinc from the mantle to the surface environment. Seafloor hydrothermal activity is expected to supply isotopically heavy zinc to the ocean. This study suggests that late-stage subsurface hydrothermal remobilization may release isotopically light zinc to the ocean, and this process may be common along mid-ocean ridges.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geochemistry & Geophysics
Antje Duerkefaelden, Joerg Geldmacher, Maxim Portnyagin, Dieter Garbe-Schoenberg, Reinhard Werner, Dietmar Mueller, Folkmar Hauff, Kaj Hoernle
Summary: Geochemical data and plate tectonic reconstructions support the formation of Shatsky Rise by a mantle plume, with the identification of two hotspot tracks—Papanin Ridge and Ojin Rise Seamounts verifying this hypothesis.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)
Article
Geochemistry & Geophysics
S. Thoram, W. W. Sager, W. Reed, M. Nakanishi, J. Zhang
Summary: This paper presents an improved high-resolution bathymetry map for southern Shatsky Rise, providing important insights on the evolution of the plateau. The evolution of Shatsky Rise was largely controlled by spreading ridges, with non-uniform distribution of secondary volcanic cones and numerous identified escarpments around the plateau. The map reveals widespread mass wasting, shifting sediment distribution, and changing surface morphology, emphasizing the importance of bathymetry data in deciphering geodynamic evolution.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
S. Thoram, W. W. Sager, W. Reed, M. Nakanishi, J. Zhang
Summary: This paper presents an improved high-resolution bathymetry map for southern Shatsky Rise and provides important insights on its evolution. The map reveals the distribution of secondary volcanic cones, the segmentation pattern of Tamu Massif, and the presence of numerous escarpments. The results suggest that spreading ridges largely controlled the evolution of Shatsky Rise during its active volcanic phase.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geosciences, Multidisciplinary
Dhongil Lim, Jihun Kim, Jonguk Kim, Dongsung Kim, Dohyun Jeong, Haryun Kim, Zhaokai Xu
Summary: Sedimentary evidence from a well-dated sediment core from the Central Indian Ridge reveals enhanced volcanic activity during the last deglaciation period, possibly linked to sea-level variability. The study suggests that the increase in submarine and subaerial volcanic eruptions during the last deglaciation may have accelerated the rise of atmospheric CO2, reinforcing a positive feedback mechanism upon deglaciation.
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
Oceanography
Zhang Jinchang, Zhou Zhiyuan, Ding Min, Lin Jian
Summary: This paper presents three-dimensional numerical models of the Shatsky Rise triple junction, showing distinctive features in the mantle flow velocity field and temperature structure. The faster-spreading ridges are associated with higher temperatures at depth, while the slowest-spreading ridge exhibits the most significant increase in temperature toward the triple junction. The presence of the triple junction alters the along-ridge-axis velocity and thermal fields of the Shatsky Rise compared to many present-day triple junctions.
JOURNAL OF OCEAN UNIVERSITY OF CHINA
(2021)
Article
Geochemistry & Geophysics
C. Peirce, M. J. Funnell, T. J. Reston, C. J. MacLeod
Summary: This study models the structure of multiple OCCs on the Mid-Atlantic Ridge using seismic tomography. The results suggest that the formation of OCCs may be influenced by the presence of magma and the characteristics of the crust. The study also investigates the drivers of hydrothermal circulation in different vent fields, revealing varying mechanisms in different regions.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
Jyun-Nai Wu, Ross Parnell-Turner, Daniel J. Fornari, Gregory Kurras, Natalia Berrios-Rivera, Thibaut Barreyre, Jill M. McDermott
Summary: Due to the lengthy eruption cycles and remote location of mid-ocean ridges, it is challenging to directly observe seafloor volcanic eruptions. In this study, researchers collected near-bottom data and combined them with other measurements to analyze the volcanic eruptions at 9°50'N on the East Pacific Rise in 2005-2006. The results provided estimations of the lava flow extent and volume, serving as important references for studying future eruptions in the area.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Article
Multidisciplinary Sciences
Hong-Hong Wei, Guo-Li Wu, Lin Ding, Long-Gang Fan, Lin Li, Qing-Ren Meng
Summary: The mid-Tertiary uplift of the NE Tibetan plateau is likely driven by edge convection, which explains various geological phenomena. There are contrasting views on the timing and mechanisms of the uplift, with many attributing it to crustal shortening. However, a comprehensive investigation challenges these previous views and suggests a different mechanism involving vertical crustal uplifting and supracrustal stretching.
NATIONAL SCIENCE REVIEW
(2023)
Article
Geochemistry & Geophysics
M. Le Saout, D. Palgan, C. W. Devey, T. S. Lux, S. Petersen, D. Thorhallsson, A. Tomkowicz, S. Brix
Summary: Mapping and sampling of the Reykjanes Ridge reveals that tectonic and volcanic activity do not vary systematically with distance from the Iceland plume center. The tectonic geometry is related to the deepening of the brittle/ductile transition and the rapid change in crustal thickness. Fault density and sediment thickness provide insight into the region of young volcanism, while the abundance of seamounts suggests a connection to the melt production process beneath the ridge axis.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2023)
Article
Geosciences, Multidisciplinary
Masako Tominaga, Estefania Ortiz, Joshua Franz Einsle, Noah Francis Ryoichi Vento, Matthew O. Schrenk, Iris Buisman, Isra S. Ezad, Dawn Cardace
Summary: This study utilized a novel approach combining multi-scale quantitative rock magnetic analyses and nano-resolution geochemical imaging analyses to investigate mineral weathering within a serpentinite formation in California. The findings revealed a new mode of magnetite production in serpentinites, highlighting the potential of magnetite abundance as a proxy for water-rock interaction in mantle peridotite and serpentinite.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Correction
Geosciences, Multidisciplinary
A. Beinlich, T. John, J. C. Vrijmoed, M. Tominaga, T. Magna, Y. Y. Podladchikov
Summary: The paper has been corrected and the correction has been published at the specified link.
Article
Geochemistry & Geophysics
Masako Tominaga, Maurice A. Tivey, William W. Sager
Summary: The study establishes a revised GPTS for the Middle to Late Jurassic, revealing the rapid onset of the Mesozoic Dipole Low from M42 through M39 and subsequent gradual recovery in field strength into the Cenozoic. Coherency between short-wavelength anomalies in the Japanese and Hawaiian lineation magnetic anomaly sequences implies a regionally coherent field during this period of rapid geomagnetic reversals. The identification of a zone of difficult-to-correlate anomalies in both sequences suggests the presence of a core similar to the JQZ crust bounded by M39-M41 isochrons.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
Yanming Huang, William W. Sager, Jinchang Zhang, Masako Tominaga, John Greene, Masao Nakanishi
Summary: Shatsky Rise oceanic plateau was formed during a period of frequent geomagnetic polarity reversals, with reconstruction of its tectonic evolution using magnetic anomalies. The study found that linear magnetic anomalies are ubiquitous in the region, suggesting that these volcanic edifices may have formed through spreading similar to mid-ocean ridges.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
Anne M. Trehu, Masako Tominaga, Mitch Lyle, Kathy Davenport, Benjamin J. Phrampus, Jules Favorito, Edward Zhang, Brandi L. Lenz, Srisharan Shreedharan, Subbarao Yelisetti
Summary: New seismic reflection data collected and processed as part of early career scientist training at sea and in classroom projects provide new insights into anomalous subduction behavior and mass wasting along the south-central Cascadia Subduction Zone (CSZ) and fill gaps in seismic coverage of the region.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Article
Geochemistry & Geophysics
E. Contreras, P. Jimenez Garcia, W. W. Sager, S. Thoram, K. Hoernle, R. Sarralde, H. Zhou
Summary: This study developed a bathymetric map of Valdivia Bank using various data sets, revealing previously unknown geological features and demonstrating ongoing geological activities in oceanic plateaus.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Article
Geochemistry & Geophysics
S. Thoram, W. W. Sager, W. Reed, M. Nakanishi, J. Zhang
Summary: This paper presents an improved high-resolution bathymetry map for southern Shatsky Rise and provides important insights on its evolution. The map reveals the distribution of secondary volcanic cones, the segmentation pattern of Tamu Massif, and the presence of numerous escarpments. The results suggest that spreading ridges largely controlled the evolution of Shatsky Rise during its active volcanic phase.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Multidisciplinary Sciences
Brendan T. Philip, Evan A. Solomon, Deborah S. Kelley, Anne M. Trehu, Theresa L. Whorley, Emily Roland, Masako Tominaga, Robert W. Collier
Summary: Pythia's Oasis is a newly discovered seafloor seep on the Central Oregon segment of the Cascadia Subduction Zone, emitting highly altered fluids similar to 9 degrees C above the background temperature. The unique chemistry of the seep fluids includes extreme enrichment of boron and lithium and depletion of chloride, potassium, and magnesium. The fluids, sourced from pore water compaction and mineral dehydration reactions, have minimum source temperatures of 150 degrees to 250 degrees C, indicating the source near the plate boundary offshore Central Oregon. The high fluid flow rates are likely driven by extreme overpressures along the plate boundary, with potential regulation by vertical faults such as the Alvin Canyon Fault in Central Cascadia.
Article
Geochemistry & Geophysics
Masako Tominaga, Andreas Beinlich, Eduardo A. Lima, Paiden Pruett, Noah R. Vento, Benjamin P. Weiss
Summary: In this study, we investigate in situ serpentinization and mineral carbonation processes in oceanic lithosphere using a combination of field magnetic measurements, rock magnetic analyses, microscopy, and phase mapping. Our results show a correlation between changes in magnetic signal strengths and the amount of alteration, providing insights into the mode of fluid flow and the composition that control the scale and extent of carbonation. This study highlights the potential use of magnetometry as a monitoring tool for the reaction progress from serpentinite to carbonate-bearing assemblages.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2023)
Article
Multidisciplinary Sciences
M. L. G. Tejada, T. Sano, T. Hanyu, A. A. P. Koppers, M. Nakanishi, T. Miyazaki, A. Ishikawa, K. Tani, S. Shimizu, K. Shimizu, B. Vaglarov, Q. Chang
Summary: This study finds new evidence, such as the discovery of low-Ti basalts on the Ontong Java Plateau that match those on the Manihiki Plateau, and the identification of new age data that bridge the temporal gap between the Ontong Java Plateau and Hikurangi Plateau. These findings support the hypothesis of the Ontong Java Nui super oceanic plateau and provide insights into the tectonomagmatic evolution of the region.
SCIENTIFIC REPORTS
(2023)
Article
Geosciences, Multidisciplinary
Eunseo Choi, Masako Tominaga
Summary: We find that the ridge-parallel bathymetric profiles of fast- and intermediate-spreading seafloor are mostly upward concave, excluding the inward part of the seafloor within the fracture zone valley. The evolution of the bathymetric profiles formed at the Chile Rise shows rapid growth of the middle deflection followed by a steady state, which can be explained as the flexure of a thin elastic plate contracting thermally. Our model is consistent with recent observations that the oceanic lithosphere is cut open at fracture zone valleys, disproving the previous assumption of bending down of the ocean floor.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geosciences, Multidisciplinary
S. Thoram, W. W. Sager, K. Gaastra, S. M. Tikoo, C. Carvallo, A. Avery, Arianna V. Del Gaudio, Y. Huang, K. Hoernle, T. W. Hoefig, R. Bhutani, D. M. Buchs, C. Class, Y. Dai, G. Dalla Valle, S. Fielding, S. Han, D. E. Heaton, S. Homrighausen, Y. Kubota, C. -f. Li, W. R. Nelson, E. Petrou, K. E. Potter, S. Pujatti, J. Scholpp, J. W. Shervais, M. Tshiningayamwe, X. J. Wang, M. Widdowson
Summary: Valdivia Bank (VB) is a Late Cretaceous oceanic plateau formed by seafloor spreading-type volcanism from the Tristan-Gough hotspot at the Mid-Atlantic Ridge. Magnetic data and inversion techniques were used to determine the crustal magnetization and reveal linear polarity zones, supporting the formation by seafloor spreading over approximately 4 million years. Paleomagnetism and biostratigraphy data from International Ocean Discovery Program Expedition 391 provide further evidence for this magnetic interpretation. The presence of deep rift valleys and the split of anomaly C33r into negative bands suggest a plate reorganization and the involvement of a westward ridge jump in the formation of VB.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geochemistry & Geophysics
Lingyu Zhang, Kristoffer Szilas
Summary: This study presents new petrological and geochemical data for the Narssaq Ultramafic Body (NUB) in the Itsaq Gneiss Complex of SW Greenland. The results indicate that the ultramafic rocks of NUB are not mantle residues, but instead represent crustal cumulates derived from high-Mg magmas.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Rong Xu, Sarah Lambart, Oliver Nebel, Ming Li, Zhongjie Bai, Junbo Zhang, Ganglan Zhang, Jianfeng Gao, Hong Zhong, Yongsheng Liu
Summary: This study investigated the iron isotope compositions of Cenozoic basalts in Southeast China, finding significant variations related to different types of basalts and their respective sources.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
C. J. Ebinger, Miriam C. Reiss, Ian Bastow, Mary M. Karanja
Summary: The East African rift system is formed above mantle upwellings and the formation of rifts is related to lithospheric thinning and magmatic activity. The amount of splitting varies spatially and the fast axes are predominantly parallel to the orientation of the rifts. Thick lithospheric modules have less splitting and different orientations, which may indicate mantle plume flow. Splitting rotates and increases in strength as it enters the rift zones, suggesting that the anisotropy is mainly present at shallow depths.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Correction
Geochemistry & Geophysics
Ekaterina Rojas-Kolomiets, Owen Jensen, Michael Bizimis, Gene Yogodzinski, Lukas Ackerman
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Robert W. Nicklas, Igor S. Puchtel, Ethan F. Baxter
Summary: Oxygen fugacity is a fundamental parameter for understanding redox processes in igneous systems. This study compares the Fe-XANES oxybarometry method with the V-in-olivine method for evaluating fO(2) in MORB lavas. The results show that the V-in-olivine method is not applicable to samples with low MgO content, and that the majority of Archean komatiite sources have lower fO(2) than modern MORB.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Chunfei Chen, Stephen F. Foley, Sebastian Tappe, Huange Ren, Lanping Feng, Yongsheng Liu
Summary: The volatile components CO2 and H2O play a major role in mantle melting and heterogeneity. In this study, Ca isotopes were used to trace the lithological heterogeneity in alkaline magmatic rocks. The results revealed the presence of K-richterite and carbonate components as the source of alkaline magmas with low delta 44/40Ca values. These findings highlight the importance of Ca isotopes as a robust tracer of lithological variation caused by volatiles in the Earth's upper mantle.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Timothee Jautzy, Gilles Rixhon, Regis Braucher, Romain Delunel, Pierre G. Valla, Laurent Schmitt, Aster Team
Summary: Although the current approach to estimate catchment-wide denudation rates using only 10Be concentrations has made significant progress in geomorphology, this study argues for the inclusion of 26Al measurements and testing of steady-state assumptions in slow eroding, formerly glaciated landscapes. The study conducted measurements of both 10Be and 26Al in stream sediments from the Vosges Massif in France and found that elevation, slope, channel steepness, and precipitation were the primary factors controlling denudation rates. The study also revealed a significant relationship between the extent of past glaciation and the cosmogenic (un-)steadiness in the stream sediments.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Erik van der Wiel, Douwe J. J. van Hinsbergen, Cedric Thieulot, Wim Spakman
Summary: Numerical models of Earth's mantle dynamics can predict the vigour and mixing of mantle flow, and the average slab sinking rates are an unexplored parameter that can provide intrinsic information on these characteristics. Through numerical experiments, it has been found that slab sinking rates are strongly correlated with mantle convection and mixing, and may explain geochemical observations from hotspot volcanoes.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
