Article
Geochemistry & Geophysics
Oke Okwokwo, Neil C. Mitchell, Wen Shi, I. C. F. Stewart, A. Y. Izzeldin
Summary: This study derives crustal magnetization for a constant-thickness source layer within the uppermost basement by inverting aeromagnetic anomalies. The results show that the low amplitudes of off-axis magnetic anomalies are mainly due to the greater depth of basement, which is depressed by isostatic loading by evaporites. However, magnetizations are still significant even where the basement lies several kilometers under the evaporites, suggesting that magnetizations have not been greatly affected by alteration under the evaporites. Additionally, prominent magnetization peaks are found on both tectonic plates, coinciding with a basement low that marks the transition to continental crust closer to the coasts. There is also an abrupt change from low-frequency anomalies off-axis to high-frequency anomalies towards the present axis, potentially indicating the stage at which buried spreading centers became exposed.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
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
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
Paul Wessel, Anthony B. Watts, Seung-Sep Kim, David T. Sandwell
Summary: This article introduces a series of models for seamount studies, including the initial construction and subsequent mass-wasting phases. It also presents axisymmetric density variations that are compatible with observed first-order structure.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
David Schlaphorst, Catherine A. Rychert, Nicholas Harmon, Stephen P. Hicks, Petros Bogiatzis, J-Michael Kendall, Rachel E. Abercrombie
Summary: Seismicity along transform faults provides important constraints for understanding earthquake ruptures. This study presents the first local seismicity catalog of slow spreading ridges based on data recorded by a temporary broad-band network. Most of the earthquakes are located along the Chain Transform Fault, Romanche transform fault, and the Mid-Atlantic Ridge. The seismic events are characterized by normal faulting along the ridge and strike-slip faulting along the transforms, with some reverse mechanisms.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
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
M. Rodriguez, D. Sakellariou, C. Gorini, A. Janin, E. D'Acremont, L. Le Pourhiet, N. Chamot-Rooke, K. Tsampouraki-Kraounaki, I Morfis, G. Rousakis, P. Henry, A. Lurin, M. Delescluse, P. Briole, A. Rigo, S. Arsenikos, C. Bulois, D. Fernandez-Blanco, A. Beniest, C. Grall, F. Chanier, F. Caroir, J-X Dessa, D. Oregioni, A. Nercessian
Summary: This study uses seismic reflection lines to reveal the subsurface structure and sedimentary record in the North Aegean region, and finds that the two main branches of the North Anatolian Fault were formed 1.3-2 million years ago, and since the Early Pleistocene, the North Aegean Troughs have been propagating westwards to form horsetail basins.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Multidisciplinary Sciences
Jana C. Schierjott, Garrett Ito, Mark D. Behn, Xiaochuan Tian, Thomas Morrow, Boris J. P. Kaus, Javier Escartin
Summary: Oceanic detachment faults are extreme forms of seafloor creation, associated with weak magmatism. 3-D numerical models and rock physics experiments suggest that shear-stress on the transform fault generates excess lithospheric tension, promoting detachment faulting on the inside corner of a ridge-transform intersection.
SCIENTIFIC REPORTS
(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
Geography, Physical
Ursula Schlager, Wilfried Jokat, Estella Weigelt, Catalina Gebhardt
Summary: The study in the Siberian part of Lomonosov Ridge revealed a systematic picture of submarine landslides, with twelve crescent-shaped escarpments identified as remnants of landslide events occurring between mid Pliocene and mid Miocene. The relatively small amounts of mobilized sediments seem to be typical for the Lomonosov Ridge. Changes in sediment type preconditioned, and co-occurring earthquakes may have finally triggered the submarine landslides.
Article
Geosciences, Multidisciplinary
Edgardo Canon-Tapia
Summary: Nearly 80% of the seafloor extension remains unexplored, making it difficult to directly observe seamounts. However, databases comparing global seamount location and height have been created using different techniques. This study compared four publicly available databases and found significant differences among them, which can impact models of seamount production and geodynamic processes. Despite these differences, all databases can identify seamount lines along the Mid Ocean Ridge system and in intraplate settings. These findings challenge the traditional understanding of seamount formation and call for a reassessment of the relationship between volcanic and tectonic activities.
GEOSCIENCE FRONTIERS
(2023)
Article
Geosciences, Multidisciplinary
Jiang Zhu, Zhaochong Zhang, M. Santosh, Shucheng Tan, Ziliang Jin
Summary: The study highlights the role of submarine and subaerial volcanic activities in the Emeishan Large Igneous Province in causing ocean acidification and calcification crisis, which may have contributed to the end-Guadalupian crisis. It proposes that the release of sulfur dioxide from submarine basaltic eruptions triggered ocean acidification, while explosive silicic volcanism on land potentially drove the global cooling event in the Wuchiapingian stage.
Article
Astronomy & Astrophysics
Glenn S. Sasagawa, Mark A. Zumberge, Matthew J. Cook
Summary: Axial Seamount is a seafloor volcano that experiences frequent eruptions and cycles of inflation and deflation. To accurately interpret geodetic data, a drift corrected pressure recorder was deployed, and the calibrated results show varying inflation rates of the seamount from July 2018 to December 2021.
EARTH AND SPACE SCIENCE
(2023)
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
M. Ersen Aksoy, Mustapha Meghraoui, Alina Polonia, M. Namik Cagatay, Asli Zeynep Yavuzoglu, Sebnem Onder, Umut B. Ulgen, Luca Gasperini
Summary: This study focused on the westernmost segment of the North Anatolian fault in NW Turkey and found that the western termination of the 1912 earthquakes' surface ruptures ends about 37 km offshore in the Gulf of Saros. The research suggests that the eastern extension of the 9 August earthquake reached the Central Marmara Basin, with implications for seismic hazard in the Marmara coastal area.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
Michele Paulatto, Juan Pablo Canales, Robert A. Dunn, Robert A. Sohn
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2015)
Article
Geochemistry & Geophysics
Milena Marjanovic, Helene Carton, Suzanne M. Carbotte, Mladen R. Nedimovic, John C. Mutter, J. Pablo Canales
GEOPHYSICAL JOURNAL INTERNATIONAL
(2015)
Article
Geochemistry & Geophysics
G. Horning, J. P. Canales, S. M. Carbotte, S. Han, H. Carton, M. R. Nedimovic, P. E. van Keken
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2016)
Article
Geochemistry & Geophysics
Shuoshuo Han, Suzanne M. Carbotte, Juan Pablo Canales, Mladen R. Nedimovic, Helene Carton, James C. Gibson, Greg W. Horning
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2016)
Article
Geochemistry & Geophysics
Shuoshuo Han, Suzanne M. Carbotte, Helene Carton, John C. Mutter, Omid Aghaei, Mladen R. Nedimovic, J. Pablo Canales
EARTH AND PLANETARY SCIENCE LETTERS
(2014)
Article
Geochemistry & Geophysics
Kori R. Newman, Mladen R. Nedimovic, J. Pablo Canales, Suzanne M. Carbotte
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2011)
Article
Geochemistry & Geophysics
Milena Marjanovic, Suzanne M. Carbotte, Mladen R. Nedimovic, Juan Pablo Canales
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2011)
Article
Geochemistry & Geophysics
Minghui Zhao, Juan Pablo Canales, Robert A. Sohn
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2012)
Article
Geochemistry & Geophysics
A. S. Henig, D. K. Blackman, A. J. Harding, J. -P. Canales, G. M. Kent
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2012)
Article
Geochemistry & Geophysics
Omid Aghaei, Mladen R. Nedimovic, Helene Carton, Suzanne M. Carbotte, J. Pablo Canales, John C. Mutter
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2014)
Article
Geology
A. F. Arnulf, A. J. Harding, G. M. Kent, S. M. Carbotte, J. P. Canales, M. R. Nedimovic
Article
Geosciences, Multidisciplinary
J. P. Canales, H. Carton, S. M. Carbotte, J. C. Mutter, M. R. Nedimovic, M. Xu, O. Aghaei, M. Marjanovic, K. Newman
Article
Geosciences, Multidisciplinary
Suzanne M. Carbotte, Milena Marjanovic, Helene Carton, John C. Mutter, Juan Pablo Canales, Mladen R. Nedimovic, Shuoshuo Han, Michael R. Perfit
Article
Geosciences, Multidisciplinary
Milena Marjanovic, Suzanne M. Carbotte, Helene Carton, Mladen R. Nedimovic, John C. Mutter, Juan Pablo Canales
Article
Oceanography
Suzanne M. Carbotte, Juan Pablo Canales, Mladen R. Nedimovic, Helene Carton, John C. Mutter