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
Multidisciplinary Sciences
Lucia Villar-Munoz, Masataka Kinoshita, Joaquim P. Bento, Ivan Vargas-Cordero, Eduardo Contreras-Reyes, Umberta Tinivella, Michela Giustiniani, Natsue Abe, Ryo Anma, Yuji Orihashi, Hikaru Iwamori, Tomoaki Nishikawa, Eugenio Andres Veloso, Satoru Haraguchi
Summary: Integrated analysis of geophysical and geological datasets in the Chile Triple Junction has improved understanding of the hydrogeological system. Anomalous high heat flow values and fluid advection are influenced by geological structures, pressure-driven discharge, and ridge subduction, providing valuable insights for studies related to hydrothermal circulation, seismicity, volcanism, and gas hydrate stability.
SCIENTIFIC REPORTS
(2021)
Article
Environmental Sciences
Petrus Galvao, Bruna Sus, Jose Lailson-Brito, Alexandre Azevedo, Olaf Malm, Tatiana Bisi
Summary: This study investigated the bioaccumulation of monomethylmercury (MeHg) in deep-sea fish from the Southeast Atlantic Ocean, revealing that muscle tissue is the main storage site for MeHg, while liver tissue contains the highest total mercury concentrations. The research also highlights the promotion of mercury biomagnification in a tropical upwelling ecosystem, suggesting that upwelling areas may serve as hot spots for monitoring MeHg in marine biota.
Article
Geochemistry & Geophysics
William W. Sager, Sriharsha Thoram, Daniel W. Engfer, Anthony A. P. Koppers, Cornelia Class
Summary: The study of Rio Grande Rise and Walvis Ridge in the South Atlantic revealed a complex tectonic history during the Late Cretaceous, involving the formation of a microplate surrounded by igneous massifs. This challenges simple hot spot models for the evolution of these large igneous provinces.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)
Article
Geosciences, Multidisciplinary
Vincent Roche, Sylvie Leroy, Sidonie Revillon, Francois Guillocheau, Gilles Ruffet, William Vetel
Summary: The study reveals the existence of a plume-related magma-rich margin, called the Natal segment, characterized by seaward dipping reflectors that are inferred to be basalts. It is associated with the Karoo superplume activity from around 180 Ma and suggests the stretching of the continental crust and a more southern position of Antarctica, which should be considered in future kinematic models.
Article
Geosciences, Multidisciplinary
Thais Mothe Maia, Anderson Costa dos Santos, Sergio Castro Valente, Eduardo Reis Viana Rocha-Junior, Guilherme Pacheco Watson de Barros, Monica Heilbron, Claudio de Morisson Valeriano, Michele Arena
Summary: The study investigates the tectonic features, petrogenesis, and isotopic compositions of the Abrolhos Magmatic Province (AMP) located near the Brazilian coastline. The results reveal that the AMP rocks are alkaline in nature and have a complex formation process involving multiple sources from the lithosphere. Additionally, the study suggests a cogenetic relationship between the AMP and the Vit ' oria-Trindade Ridge.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2022)
Article
Geochemistry & Geophysics
Zhonglan Liu, Marta Perez-Gussinye, Lars Ruepke, Iskander A. Muldashev, Timothy A. Minshull, Gaye Bayrakci
Summary: The study focuses on the formation mechanisms of low-angle normal faults and their role in tectonic asymmetry and mantle hydration. During extreme extension, slip on active faults bifurcates into brittle and ductile deformation branches. Brittle deformation penetrates the Moho and leads to mantle hydration, while ductile deformation forms detachment-like structures in distal margin sections.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Review
Energy & Fuels
Maria De La Fuente, Sandra Arndt, Hector Marin-Moreno, Tim A. Minshull
Summary: This review examines the potential destabilization of marine methane hydrates due to anthropogenic ocean warming and the resulting release of methane to the ocean-atmosphere. The article highlights the need for quantifying the modulating effect of various processes on seafloor methane emissions and the impact of benthic methane consumption on ocean carbon chemistry. The limitations of current numerical models in assessing these effects and the recommendation for future modeling improvements are also discussed.
Article
Geochemistry & Geophysics
A. H. Robinson, G. Bayrakci, C. Macdonald, T. A. Minshull, J. M. Bull, M. Chapman, T. J. Henstock, B. Callow
Summary: Vertical fluid-escape structures are important potential pathways for fluid flow. This study analyzes seismic anisotropy in the Scanner Pockmark Complex in the North Sea, and finds that the anisotropy within the chimney is associated with the gas migration system, indicating its presence and formation.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
R. W. Allen, J. S. Collier, T. J. Henstock
Summary: This study presents a 2D P-wave velocity model of the outer rise region of the Lesser Antilles island arc, which is the first wide-angle seismic study of outer rise processes at an Atlantic subduction zone. The results show a clear decrease in velocity as the incoming plate approaches the trench, attributed to outer rise bend-related hydration. The style of crustal accretion is a primary control over the distribution of water within the slab at Atlantic subduction systems.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
Bhargav Boddupalli, Tim A. Minshull, Gaye Bayrakci, Gael Lymer, Tim J. Reston, Dirk Klaeschen
Summary: High-resolution velocity models developed using full-waveform inversion (FWI) can reveal fine details of the subsurface structure. The study in DGM shows that there is no distinct upper and lower crustal layer within the hyper-thinned crust, and exhumation of the lower crust is observed at fault block footwalls. The morphology of the S-reflector appears to be influenced by the volume-increasing process of serpentinization and deformation of the overlying crust.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
Akash Trivedi, Sudipta Sarkar, Hector Marin-Moreno, Timothy A. Minshull, Pippa L. Whitehouse, Utpal Singh
Summary: This study investigates the impact of temperature and sea level changes on methane hydrates on the upper continental slope west of Svalbard. Two contrasting hypotheses are tested, and it is concluded that recent ocean warming plays a critical role in hydrate dissociation in this area.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
Mike Lindner, Andreas Rietbrock, Lidong Bie, Saskia Goes, Jenny Collier, Catherine Rychert, Nicholas Harmon, Stephen P. Hicks, Tim Henstock
Summary: By deploying ocean bottom seismometers and using the Am Phi B-'Amphibious Bayesian' inversion method, the study reveals the influence of the quality of horizontal components on the research of earthquake source mechanism in the Lesser Antilles. The Bayesian formulation in Am Phi B significantly reduces the artificial compensated linear vector dipole (CLVD) contributions and improves the accuracy of the focal geometry compared to standard inversion methods. The study also analyzes the stress regimes along the subduction zone and discovers the variations in stress conditions along the arc.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
Xiongwei Niu, T. A. Minshull, Jiabiao Li, Aiguo Ruan, Zhenli Wu, Xiaodong Wei, Wei Wang, Yan Li, G. Bayrakci, Chongzhi Dong, Weiwei Ding, Yinxia Fang, Jie Zhang
Summary: Shear wave velocities can provide important information about crustal lithology. By analyzing observations from ocean-bottom seismometer data, we have determined variations in crustal P-wave velocity, S-wave velocity, Vp/Vs, and Poisson's ratio along the Southwest Indian Ridge. Our findings suggest that there are similar layered structures beneath both magmatically robust segment centers and the non-transform discontinuity between them.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Multidisciplinary Sciences
Stephen P. Hicks, Lidong Bie, Catherine A. Rychert, Nicholas Harmon, Saskia Goes, Andreas Rietbrock, Songqiao Shawn Wei, Jenny S. Collier, Timothy J. Henstock, Lloyd Lynch, Julie Prytulak, Colin G. Macpherson, David Schlaphorst, Jamie J. Wilkinson, Jonathan D. Blundy, George F. Cooper, Richard G. Davy, John -Michael Kendall
Summary: Volatiles expelled from subducted plates affect the melting of the overlying mantle, which is important for arc volcanism. This study examines seismic attenuation beneath the Lesser Antilles arc and reveals the role of expelled fluids and melt in controlling volcanism. The results show that cold boundary layers transport fluids towards the back-arc, while warm mantle beneath the back-arc feeds arc volcanoes.
Article
Geochemistry & Geophysics
Farid Jedari-Eyvazi, Gaye Bayrakci, Timothy A. Minshull, Jonathan M. Bull, Timothy J. Henstock, Calum Macdonald, Adam H. Robinson
Summary: By analyzing the ocean bottom seismometer data from Scanner Pockmark in the North Sea, this study identified and characterized a complex fluid escape structure including a chimney. The tomographic velocity model revealed the distribution of gas migration and accumulation, indicating the sustainability of methane flux at Scanner Pockmark.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Review
Environmental Sciences
Marta Perez-Gussinye, Jenny S. S. Collier, John J. J. Armitage, John R. R. Hopper, Zhen Sun, C. R. Ranero
Summary: Interactions between tectonic, magmatic, sedimentary, and hydrothermal processes shape the wide variability of rifted margin anatomy. Understanding these processes is crucial for assessing the potential of these margins to support the transition to a carbon-neutral economy. Integrated geophysical studies and advanced numerical modeling techniques are needed to better characterize these environments and de-risk exploration. This Review provides insights into the process-based understanding of rifted margin formation and their resource potential for the energy transition.
NATURE REVIEWS EARTH & ENVIRONMENT
(2023)
Article
Energy & Fuels
Jon Duell, Justin Dix, George Callender, Tim Henstock, Hannah Porter
Summary: Determining reliable cable ampacities for marine high voltage cables is currently being reassessed to optimize design and reduce costs. Oceanographic models have shown promising accuracy in predicting ocean bottom temperatures, which can significantly impact cable ratings. Validated modelled ocean bottom temperatures provide incomparable coverage and resolution, improving the accuracy of ampacity estimates.
Article
Geochemistry & Geophysics
Akash Trivedi, Sudipta Sarkar, Hector Marin-Moreno, Timothy A. Minshull, Pippa L. Whitehouse, Utpal Singh
Summary: This study investigated the mechanisms by which the stability of methane hydrates at the UCS off west Svalbard is influenced by changes in bottom water temperature and sea level. The simulation results suggest that long-term sea level fall will progressively decrease the hydrate stability zone, while a sudden rise in bottom water temperature increases the likelihood of hydrate dissociation.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)