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
Kevin Growe, Ingo Grevemeyer, Satish C. Singh, Milena Marjanovic, Emma P. M. Gregory, Cord Papenberg, Venkata Vaddineni, Laura Gomez de la Pena, Zhikai Wang
Summary: Recent studies have challenged the idea that transform zone crust may be magmatically augmented instead of anomalous hydrated lithosphere. Research on the St. Paul fracture zone revealed that the crust along and away from the fracture zone showed almost uniform thickness of 5-6 km, resembling normal oceanic crust.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(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
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
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
Geosciences, Multidisciplinary
Norikatsu Akizawa, Marguerite Godard, Benoit Ildefonse, Shoji Arai
Summary: Troctolites from the Hess Deep Rift, sampled during the Integrated Ocean Drilling Program Expedition 345, were studied. They are divided into three groups based on their particle size, and the major-element compositions are intermediate between gabbros and harzburgites in Hess Deep. The research reveals that fractional crystallization is the dominant process responsible for the formation of these rocks.
PROGRESS IN EARTH AND PLANETARY SCIENCE
(2023)
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
Eduardo Contreras-Reyes, Sebastian Obando-Orrego, Ingo Grevemeyer
Summary: This study uses simultaneous P- and S-wave data to investigate the seismic structure of the oceanic crust. The results show different seismic properties at different locations, indicating hydrothermal alteration and compaction processes. The abrupt change in seismic properties at the layer 2/3 transition is attributed to epidotization and crack-change properties.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Biotechnology & Applied Microbiology
Shu Ying Wee, Virginia P. Edgcomb, David Beaudoin, Shari Yvon-Lewis, Jason B. Sylvan
Summary: This study involved drilling into the lower oceanic crust at Atlantis Bank to collect rocks for microbial analysis. The research found a low abundance of microbes positively correlated with rock characteristics. Microbial diversity varied with depth, and the addition of nutrients did not have a significant effect on microbial communities.
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
(2021)
Article
Environmental Sciences
Jingxuan Wei, Kathryn L. Gunn, Robert Reece
Summary: This study investigates the spatial distribution of diapycnal mixing in the central South Atlantic thermocline and its drivers using seismic reflection data. The results show that thermocline diffusivities have changed little in this region, but exhibit heterogeneity at mesoscales. The Mid-Atlantic Ridge and near-inertial storms are identified as important drivers of mixing.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Oceanography
Cristina Arumi-Planas, Maria Dolores Perez-Hernandez, Josep L. Pelegri, Pedro Velez-Belchi, Mikhail Emelianov, Veronica Cainzos, Luis Cana, Yvonne L. Firing, Luis Garcia-Weil, Daniel Santana-Toscano, Alonso Hernandez-Guerra
Summary: The South Atlantic Ocean plays a crucial role in the heat exchange of the climate system by hosting the returning flow of the Atlantic Meridional Overturning Circulation (AMOC). Through data analysis from hydrographic cruises, we have identified different water masses and calculated their circulation patterns in the South Atlantic Subtropical gyre. We have also assessed the strength of the AMOC, heat transport, and freshwater flux in this region.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
Article
Geochemistry & Geophysics
Catherine A. Rychert, Saikiran Tharimena, Nicholas Harmon, Shunguo Wang, Steven Constable, J. Michael Kendall, Petros Bogiatzis, Matthew R. Agius, David Schlaphorst
Summary: The study reveals evidence of persistent melt in the equatorial Mid-Atlantic Ridge region using ocean bottom seismometer data, which has important implications for plate tectonic theory.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Geochemistry & Geophysics
Guilherme W. S. de Melo, Neil C. Mitchell, Jiri Zahradnik, Fabio Dias, Aderson F. do Nascimento
Summary: This study investigates seismicity in the 4-5 degrees N Mid-Atlantic Ridge using data from seismometers, revealing shallow seismic activity occurring in swarms from 2012 to 2019, primarily involving multiple faults. By comparing with bathymetric data, two detachment fault surfaces were identified.
Article
Geochemistry & Geophysics
Leonardo Casini, Matteo Maino, Alessio Sanfilippo, Benoit Ildefonse, Henry J. B. Dick
Summary: This study on OCC at the Mid-Atlantic Ridge reveals the process of rock weakening through melting at high temperatures and the development mechanism of ultra-mylonite. It highlights the importance of hydrated magmatic phases in promoting detach faulting in OCC.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
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
Chenguang Sun, C. Johan Lissenberg
EARTH AND PLANETARY SCIENCE LETTERS
(2018)
Article
Geochemistry & Geophysics
Chenguang Sun, C. Johan Lissenberg
EARTH AND PLANETARY SCIENCE LETTERS
(2018)
Article
Geochemistry & Geophysics
A. Sanfilippo, H. J. B. Dick, H. R. Marschall, C. J. Lissenberg, B. Urann
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2019)
Article
Geochemistry & Geophysics
S. J. de Graaff, K. M. Goodenough, M. Klaver, C. J. Lissenberg, M. N. Jansen, I. Millar, G. R. Davies
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2019)
Article
Multidisciplinary Sciences
C. Johan Lissenberg, Christopher J. MacLeod, Emma N. Bennett
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2019)
Article
Geochemistry & Geophysics
Emma N. Bennett, C. Johan Lissenberg, Katharine Cashman
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2019)
Article
Geosciences, Multidisciplinary
Sarah Lambart, Janne M. Koornneef, Marc-Alban Millet, Gareth R. Davies, Matthew Cook, C. Johan Lissenberg
Article
Geochemistry & Geophysics
Alexandra Yang Yang, Chunguang Wang, Yan Liang, C. Johan Lissenberg
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2019)
Article
Multidisciplinary Sciences
Emma N. Bennett, Frances E. Jenner, Marc-Alban Millet, Katharine V. Cashman, C. Johan Lissenberg
Article
Geochemistry & Geophysics
Liam Hoare, Martijn Klaver, Nikitha S. Saji, Jamie Gillies, Ian J. Parkinson, C. Johan Lissenberg, Marc-Alban Millet
GEOCHIMICA ET COSMOCHIMICA ACTA
(2020)
Article
Geosciences, Multidisciplinary
Marine Boulanger, Lyderic France, Jeremy R. L. Deans, Carlotta Ferrando, C. Johan Lissenberg, Anette von der Handt
FRONTIERS IN EARTH SCIENCE
(2020)
Article
Geochemistry & Geophysics
C. Johan Lissenberg, Daniel J. Condon, Andrew J. Smye, Ryo Anma
Summary: Studies of oceanic crust provide insights into crustal accretion processes at mid-ocean ridges. This study focuses on a crust formed at a superfast spreading rate and presents zircon U-Pb dates that constrain the age and duration of crustal accretion. The results suggest that crustal accretion occurs over similar time scales along slow-to-superfast-spreading ridges, with longer periods of accretion at ultraslow-spreading ridges.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2023)
Article
Geosciences, Multidisciplinary
Alessio Sanfilippo, Christopher J. MacLeod, Riccardo Tribuzio, C. Johan Lissenberg, Alberto Zanetti
FRONTIERS IN EARTH SCIENCE
(2020)
Article
Geochemistry & Geophysics
M. N. Jansen, C. J. Lissenberg, M. Klaver, S. J. de Graaff, J. M. Koornneef, R. J. Smeets, C. J. MacLeod, G. R. Davies
GEOCHEMICAL PERSPECTIVES LETTERS
(2018)
Article
Geosciences, Multidisciplinary
Julien Leuthold, C. Johan Lissenberg, Brian O'Driscoll, Ozge Karakas, Trevor Falloon, Dina N. Klimentyeva, Peter Ulmer
FRONTIERS IN EARTH SCIENCE
(2018)
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)