Article
Geosciences, Multidisciplinary
Xiaoran Chen, Vadim Levin, Huaiyu Yuan
Summary: Using splitting in core-refracted teleseismic shear waves, anisotropic properties of the upper mantle beneath the Superior craton in eastern North America and the Yilgarn craton in Western Australia were investigated. Evidence of alignment between fast directions and absolute plate motion was found in North America, but not in Western Australia.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geosciences, Multidisciplinary
Tianze Liu, Emily J. Chin, Peter Shearer
Summary: This study reveals that mantle metasomatism is likely an important cause of mid-lithosphere discontinuities worldwide, which is significant for understanding the structure and evolution of cratonic lithospheres.
Article
Geochemistry & Geophysics
Junjie Zhang, Pengyuan Guo, Pu Sun, Yaoling Niu, Yuanyuan Xiao, Paulo M. Vasconcelos
Summary: This study investigates the origin of early Cretaceous intra-plate alkali basalts from the Western North China Craton (WNCC) and suggests that these rocks originated from partial melting of the lithospheric mantle that experienced melt metasomatism. The geochemical characteristics of these basalts indicate contributions from two different types of metasomatic melts. Additionally, the presence of specific element abundance and isotopic compositions in the basalts suggests a complex origin involving reactions between mantle peridotite and melts of different sources.
Article
Geology
Zeguang Chang, Guochen Dong, James M. Scott
Summary: The research reveals that the Archaean lithospheric mantle beneath the eastern North China Craton was weakened by hydrous melts, resulting in a fusible mantle. This change was mainly induced by the retreat of the Paleo-Pacific plate, causing lithospheric extension and decompression melting.
INTERNATIONAL GEOLOGY REVIEW
(2022)
Article
Geosciences, Multidisciplinary
D. K. Chaubey, S. S. Rai, N. Mullick, R. Das
Summary: This study examines the erosion of lithosphere by mantle plumes in the Dharwar Craton in South India. By comparing kimberlite xenoliths with seismic data, the present-day lithosphere thickness is estimated to be 165 +/- 15 km, slightly lower than the thickness derived from the erupted kimberlite around 1100 Myr ago. The analysis suggests that the eastern Dharwar Craton's lithosphere has not been significantly altered by thermal influence despite the impact of three mantle plumes in the last 90 Myr.
PRECAMBRIAN RESEARCH
(2023)
Article
Geochemistry & Geophysics
Chao Li, Jun Yan
Summary: This study investigates the nature of metasomatism at the crust-mantle interface by studying the Laixi basalt, which shows geochemical inheritance of island arc basalt-like trace-element patterns. The results suggest that the metasomatic agents are carbonated eclogite-derived melts, and imply the metasomatic reaction of mantle-wedge peridotite with carbonated silicate melt derived from the subducted upper crust in the continental subduction channel.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2022)
Article
Geochemistry & Geophysics
Helene Legros, Janina Czas, Yan Luo, Sarah Woodland, Chiranjeeb Sarkar, Steven B. Shirey, Dan Schulze, D. Graham Pearson
Summary: This study examines mantle xenoliths in a lamprophyre dyke in Ontario, Canada, to understand critical metal enrichment processes in the lithospheric mantle. The results show that melt depletion and cryptic metasomatic processes play a role in the metal enrichment, particularly in relation to carbonated silicate metasomatism. The findings highlight the significance of silico-carbonated mid-lithospheric metasomatism in creating fertile sources of critical metals.
MINERALIUM DEPOSITA
(2023)
Article
Geochemistry & Geophysics
David B. Snyder, Genevieve Savard, Bruce A. Kjarsgaard, Aeron Vaillancourt, Phillips C. Thurston, John A. Ayer, Eric Roots
Summary: A new 3D multi-azimuthal receiver function analysis has identified four regional seismic discontinuities dipping at 7-13 degrees within the mantle of the Superior craton of North America. These mantle discontinuities show different strikes parallel to the northern margin and intra-cratonic features of the Superior craton.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)
Article
Geochemistry & Geophysics
Shantanu Pandey, Xiaohui Yuan, Eric Debayle, Wolfram H. Geissler, Benjamin Heit
Summary: A stationary mantle plume can heat and erode the overlying lithosphere, and leave imprints such as thick lithosphere and velocity anomalies. In the Etendeka flood basalt region of northwest Namibia, the lithosphere was affected by magmatic processes related to a mantle plume, but has been partly reconstructed since then. The study also found velocity anomalies at different depths, potentially related to an ongoing edge-driven convection process.
Article
Geochemistry & Geophysics
Lei-Tao Cao, Jian-Ping Zheng, Hong-Kun Dai, Qing Xiong, A-Bing Lin, Shao-Kui Pan
Summary: This study investigates the formation mechanism of the eastern North China Craton mantle by analyzing spinel peridotite xenoliths in the Cenozoic basalt in Liaoning Province. Two types of mantle are identified, one modified by melt infiltration and the other transformed from asthenospheric upwelling. These findings have important implications for understanding lithosphere-asthenosphere interaction.
Article
Geosciences, Multidisciplinary
A. R. A. Aitken, M. Fiorentini, M. Tesauro, N. Thebaud
Summary: Knowledge of the evolution of ancient cratonic lithospheres underpins our understanding of Precambrian Earth. The Yilgarn Craton has exceptionally well-preserved Archean geology, but geophysical models indicate that the lithospheric mantle has been extensively refertilised. Reconciling geological and geophysical data suggests two phases of lithosphere destabilisation driven by major magmatic events, with refertilisation occurring during supercontinent assembly.
Article
Geochemistry & Geophysics
Si-Zhang Sheng, Shui-Jiong Wang, Xi-Ming Yang, Li-Hui Chen, Gang Zeng, Yan Xiao, Ji Shen, Xu-Han Dong, Yi-Wen Lv
Summary: Global basaltic rocks show significant variations in nickel isotopic compositions. This study analyzed the nickel isotopic compositions of peridotites and nephelinites in eastern China and proposed a sulfide dissolution model as the key reason for the light nickel isotopic compositions in nephelinites.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
Cin-Ty Lee, Emily J. Chin
Summary: The formation of cratons during the mid-Archean to mid-Proterozoic period was favored, resulting in stable crustal shields with thick and cold mantle roots. These cratons have remained stable over time due to the high viscosity of the cratonic mantle, possibly influenced by dehydration during the formation process. Grain size may play a more significant role in controlling cratonic strength than the hydrogen content. The cratonic mantle, despite being wet and metasomatized, has achieved strength through the coarsening of grains and the passage of fluids.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geosciences, Multidisciplinary
N. M. Korolev, L. P. Nikitina, A. B. Kuznetsov, A. G. Goncharov, O. L. Galankina, V. V. Shilovskikh, N. S. Vlasenko
Summary: The article presents new data on previously undescribed lamellar-like structures in clinopyroxenes from mantle xenoliths. The lamellar structures in the xenoliths are believed to be related to a breakdown of solid solutions during a decrease of P-T parameters. The study shows that metasomatic recrystallization of initial clinopyroxene leads to the formation of new secondary mineral assemblages.
DOKLADY EARTH SCIENCES
(2023)
Article
Geochemistry & Geophysics
C. Antoine, R. A. Spikings, D. Miletic, J. S. Marsh, S. P. Gaynor, U. Schaltegger
Summary: The extrusive component of the Karoo Large Igneous Province, the Drakensberg Continental Flood basalts of South Africa and Lesotho, is mainly composed of altered tholeiitic basalts without suitable uraniferous mineral phases for high-precision dating. Multiple techniques were used to study the plagioclase in the lavas, revealing two distinct generations of plagioclase and different alteration phases. The study explains the inaccuracies in previous dating results and provides the most accurate age for the entire lava stack.
Article
Geochemistry & Geophysics
Brian M. Covellone, Brian Savage, Yang Shen
EARTH AND PLANETARY SCIENCE LETTERS
(2015)
Article
Geochemistry & Geophysics
Brian Savage, Dimitri Komatitsch, Jeroen Tromp
BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
(2010)
Article
Geochemistry & Geophysics
Brian M. Covellone, Brian Savage
BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
(2012)
Article
Geochemistry & Geophysics
Yang Shen, Yong Ren, Haiying Gao, Brian Savage
BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
(2012)
Article
Geochemistry & Geophysics
Brian Savage, Yun Wang
BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
(2012)
Article
Geology
Brian Savage
Article
Multidisciplinary Sciences
Yun Wang, Donald W. Forsyth, Brian Savage
Article
Multidisciplinary Sciences
Yun Wang, Donald W. Forsyth, Christina J. Rau, Nina Carriero, Brandon Schmandt, James B. Gaherty, Brian Savage
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2013)
Article
Geochemistry & Geophysics
B. Savage, B. M. Covellone, Y. Shen
EARTH AND PLANETARY SCIENCE LETTERS
(2017)
Article
Geochemistry & Geophysics
Paul G. Silver, Mark D. Behn, Katherine Kelley, Mark Schmitz, Brian Savage
EARTH AND PLANETARY SCIENCE LETTERS
(2006)
Article
Geochemistry & Geophysics
B Savage, DV Helmberger
BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
(2004)
Article
Geochemistry & Geophysics
B Savage, DV Heimberger
EARTH AND PLANETARY SCIENCE LETTERS
(2004)
Article
Geochemistry & Geophysics
RB Lohman, M Simons, B Savage
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2002)
Article
Geochemistry & Geophysics
B Savage, DV Helmberger
BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
(2001)
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)