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
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
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
Geosciences, Multidisciplinary
Joel Ruch, Derek Keir, Luigi Passarelli, Domenico Di Giacomo, Ghebrebrhan Ogubazghi, Sigurjon Jonsson
Summary: Through a 60-year study of earthquake swarms in the southern Red Sea, Afar, and Gulf of Aden region, it was found that most earthquake swarms recur every few decades in the same area. The swarms are often associated with rifting events, including magmatic intrusions, surface faulting, and volcanic eruptions.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Geochemistry & Geophysics
Bin Wang, Chao-Ming Xie, Yong-Sheng Dong, Jian-Jun Fan, Yun-Peng Yu, Meng-Long Duan
Summary: The study investigated the petrology, geochemistry, and isotopic characteristics of mafic rocks in the Sumdo area, and identified two groups of rocks with distinct geochemical features. It was suggested that mantle plume/hotspot-ridge interaction may have occurred in the Sumdo Paleo-Tethys Ocean during the middle-late Permian, based on a combination of previous studies and new geochemical data.
Article
Geochemistry & Geophysics
Aierken Yierpan (''Erpan Erkin''), Johannes Redlinger, Stephan Konig
Summary: Selenium behaves as a chalcophile and moderately volatile element during planetary accretion and magmatic processes, potentially becoming a new tracer to constrain volatile depletion mechanisms. Selenium contents may be influenced by mantle melting and mantle source enrichment, with the isotopes showing fractionation during eruptive outgassing.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Geology
Khalid A. Almalki, Peter G. Betts
Summary: The Gulf of Aden is a complex geological system with three distinct domains exhibiting different gravity and magnetic characteristics. This includes active seafloor spreading in the east, isolated spreading segments in the central domain, and active continental rifting in the west near the Afar triple junction. The observations suggest a heterogeneous opening of the basin, with spreading migrating towards Afar rather than initiating at the junction as proposed by classical plate tectonic theory.
Review
Environmental Sciences
Fuad Ameen, Ali A. Al-Homaidan, Hanan Almahasheer, Turki Dawoud, Suaad Alwakeel, Sama AlMaarofi
Summary: This review evaluates heavy metal pollution on the coasts surrounding the Arabian Peninsula and suggests using specific species for biomonitoring. Standardization of monitoring processes is beneficial for future remediation actions.
MARINE POLLUTION BULLETIN
(2022)
Article
Geosciences, Multidisciplinary
Morgane Gillard, Sylvie Leroy, Mathilde Cannat, Heather Sloan
Summary: This paper presents and analyzes spreading-parallel seismic transects imaging the oceanic crust in the eastern Gulf of Aden, documenting the spreading history of the basin from 16 Ma ago to the present. Different structural characteristics in two main oceanic sub-domains are associated with varying magmatic budgets at the mid-ocean ridge. A magmatic pulse event around 11 Ma at the Sheba Ridge led to substantial deformation and additional magmatism in the western part of the studied area.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Geochemistry & Geophysics
A. T. Tapu, T. Ubide, P. M. Vasconcelos
Summary: By studying three central volcanoes in eastern Australia, the complexity of magma transport and storage during the waning of hotspot activity is revealed, and it is found that eruptive tempo of volcanism is controlled by mafic influx.
JOURNAL OF PETROLOGY
(2022)
Article
Multidisciplinary Sciences
Weidong Sun, Charles H. Langmuir, Neil M. Ribe, Lipeng Zhang, Saijun Sun, He Li, Congying Li, Weiming Fan, Paul J. Tackley, Patrick Sanan
Summary: The study highlights the inconsistency between the volcanic migration rates of the Emperor seamounts and the drifting rate of the Pacific plate, indicating significant northward and southward absolute movements of the seamounts. Numerical modeling suggests that this may be due to the attraction and capture of the upper part of the plume by a moving spreading ridge.
Article
Geosciences, Multidisciplinary
Haitao Zhang, Quanshu Yan, Chuanshun Li, Xuefa Shi
Summary: Mantle convection is crucial for magmatism and volcanism on Earth, but its distribution cannot be fully understood through seismic imaging techniques. By analyzing regional geophysical data and geochemical analysis of South Mid-Atlantic Ridge basalts, this study reveals the distribution characteristics of plume-affected asthenosphere beneath the South Atlantic Ocean. It is found that the distribution is influenced by large transform faults that block the propagation of plumes and plume-affected materials. Moreover, the melt extraction process between the mantle plume and ridge system weakens the geochemical signals of plume-affected basalts.
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2023)
Article
Geosciences, Multidisciplinary
Samuel C. Boone, Maria-Laura Balestrieri, Barry Kohn
Summary: The study presents a synthesis of a large amount of thermochronology data from northeast Africa and Arabia, revealing the evolution of geological history through the construction of cooling-heating maps. These maps offer a fresh regional perspective for exploring the interrelationship between tectonic activity, geodynamic processes, and exhumation history at a plate scale.
EARTH-SCIENCE REVIEWS
(2021)
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
Matthew L. M. Gleeson, Sally A. Gibson
Summary: The flow of high-temperature and compositionally enriched material from mantle plumes to nearby spreading centers plays a significant role in influencing up to 30% of the global mid-ocean ridge system. Channelized flow of volatile-rich melts from the Galapagos mantle plume to the Galapagos Spreading Center explains geochemical and geophysical variations observed in the region, with these melts accounting for up to 60% of the outgassed H2O.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)
Article
Geochemistry & Geophysics
Alessandro La Rosa, Derek Keir, Cecile Doubre, Federico Sani, Giacomo Corti, Sylvie Leroy, Atalay Ayele, Carolina Pagli
Summary: This study analyzed seismic activity along the Western Afar Margin and found earthquakes occurring at lower crustal depths, possibly induced by deep fluid migration. The localized deep earthquakes near hot springs, along with evidence of magmatism, suggest that seismicity during incipient continental rupture may be influenced by deep fluid migration.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)
Article
Geochemistry & Geophysics
A. Lepretre, P. Schnurle, M. Evain, F. Verrier, D. Moorcroft, P. de Clarens, C. Corela, A. Afilhado, A. Loureiro, S. Leroy, E. D'Acremont, J. Thompson, D. Aslanian, M. Moulin
Summary: The North Natal Valley and the Mozambique Coastal Plain have been studied to understand the geology of the Southwest Indian Ocean, revealing a complex structure of sedimentary and volcanic rocks. The presence of high velocity lenses indicates significant volcanic activity and the interpretation challenges existing geodynamic models.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
A. Oliveira de Sa, E. d'Acremont, S. Leroy, S. Lafuerza
Summary: The study reevaluates the complex evolution history of the northern Caribbean plate boundary in the Windward Passage area, interpreting the structure and tectonic pattern based on seismic reflection and swath-bathymetric data set. The tectono-sedimentary framework of the large strait shows contrasting patterns of deformation linked to a complex polyphase tectonic history of dominantly strike-slip faulting.
Article
Geochemistry & Geophysics
A. Corbalan, M. R. Nedimovic, K. E. Louden, M. Cannat, I Grevemeyer, L. Watremez, S. Leroy
Summary: The study presents two 150-km-long 2D P-wave tomographic velocity models along the ultraslow-spreading Southwest Indian Ridge. The velocities increase rapidly with depth, with changes possibly related to the degree of serpentinization. Multiple detachment faults and velocity gradients are identified on the ridge.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geosciences, Multidisciplinary
Morgane Gillard, Sylvie Leroy, Mathilde Cannat, Heather Sloan
Summary: This paper presents and analyzes spreading-parallel seismic transects imaging the oceanic crust in the eastern Gulf of Aden, documenting the spreading history of the basin from 16 Ma ago to the present. Different structural characteristics in two main oceanic sub-domains are associated with varying magmatic budgets at the mid-ocean ridge. A magmatic pulse event around 11 Ma at the Sheba Ridge led to substantial deformation and additional magmatism in the western part of the studied area.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Geochemistry & Geophysics
V Roche, S. Leroy, F. Guillocheau, S. Revillon, G. Ruffet, L. Watremez, E. d'Acremont, C. Nonn, W. Vetel, F. Despinois
Summary: This study interprets the tectonic structure and nature of the crust beneath the South Mozambique Coastal Plain and proposes a structural model of the Limpopo transform margin in a magma-rich context. Results indicate that the margin is characterized by ocean-continent transitions and intense magmatic activities, contributing to the formation and evolution of the transform margin.
Article
Geochemistry & Geophysics
L. Watremez, S. Leroy, E. D'Acremont, V Roche, M. Evain, A. Lepretre, F. Verrier, D. Aslanian, N. Dias, A. Afilhado, P. Schnurle, R. Castilla, F. Despinois, M. Moulin
Summary: The interplay of evolving far-field forces, plate kinematics, and magmatic activity results in a variety of structures during continental break-up. The east Limpopo transform margin in northern Mozambique is formed as Africa and Antarctica separated during the mid-Jurassic period break-up of the Gondwana supercontinent. Seismic profiles help delineate major regional crustal domains, identify widespread indications of magmatic activity, and map crustal structure of this magma-rich transform margin. The presence of intrusive and extrusive igneous units is attributed to deep-seated melting anomalies and trans-tensional fault zones. Comparisons with other transform margins show a probable dependence on the thermal and/or tectonic history of the lithosphere in crustal thinning.
Article
Geochemistry & Geophysics
Renier Viltres, Sigurjon Jonsson, Abdulaziz O. Alothman, Shaozhuo Liu, Sylvie Leroy, Frederic Masson, Cecile Doubre, Robert Reilinger
Summary: The study of the present-day motion and internal deformation of the Arabian plate reveals its overall rigidity and minimal internal deformation, with localized strain likely due to anthropogenic activities and possible subsurface magmatic processes near its western margin.
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
Abdulhakim Ahmed, Cecile Doubre, Sylvie Leroy, Derek Keir, Carolina Pagli, James O. S. Hammond, Atalay Ayele, Maxime Be de Berc, Marc Grunberg, Jerome Vergne, Romain Pestourie, Daniel Mamo, Birhanu Kibret, Nadaya Cubas, Aude Lavayssiere, Marianne Janowski, Olivier Lengline, Alessandro La Rosa, Emma L. Chambers, Finnigan Illsley-Kemp
Summary: We used teleseismic receiver function analysis to study the crustal structure of the western Afar region. Our results show spatial variations in the crustal structure and provide insights into the process of rifting through crustal thickness measurements.
JOURNAL OF AFRICAN EARTH SCIENCES
(2022)
Article
Geochemistry & Geophysics
Felicie Korostelev, Yang Lu, Fabrizio Magrini, Lapo Boschi, Sylvie Leroy, William Vetel
Summary: This study maps the entire East African Rift System (EARS) using a global surface-wave velocity model in order to understand the underlying mantle structure and its relationship with the Mozambique Channel. By analyzing seismic data from the African continent, the researchers obtain dispersion curves and phase-velocity maps, revealing the discontinuous nature of magmatic activity along the EARS and low-velocity anomalies beneath certain volcanic islands and seamounts. The presence of a low-velocity anomaly in the Mozambique Channel suggests the existence of an important magmatic system.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
K. Ezenwaka, B. Marcaillou, M. Laigle, F. Klingelhoefer, J. -F. Lebrun, M. Paulatto, Y. Biari, F. Rolandone, F. Lucazeau, A. Heuret, T. Pichot, H. Bouquerel
Summary: The fluid circulation and elevated pore pressure play a crucial role in controlling the seismogenic behavior along the plate interface in the Lesser Antilles subduction zone. Heat-flow variations indicate different fluid circulation patterns, which are closely related to the location of seismic activity.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Astronomy & Astrophysics
P. Schnurle, A. Lepretre, M. Evain, F. Verrier, P. De-Clarens, Joseph Thompson, N. Dias, A. Afilhado, A. Loureiro, S. Leroy, E. d'Acremont, D. Aslanian, M. Moulin
Summary: This study analyzes the crustal structure of the South Mozambique passive margin using seismic profiles. The results reveal the presence of sedimentary cover, magmatic or volcano-clastic deposits, and variations in crustal thickness.
EARTH AND SPACE SCIENCE
(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)