Article
Geochemistry & Geophysics
Guangli Zhang, Yumei He, Yinshuang Ai, Mingming Jiang, Chit Thet Mon, Guangbing Hou, Myo Thant, Kyaing Sein
Summary: Research using local seismic data from Myanmar revealed the three-dimensional velocity structure of the crust and lithospheric mantle beneath the Indian plate, supporting the existence of continental lithosphere and providing direct evidence for the origin of Monywa volcanic activity.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Multidisciplinary Sciences
Jason P. Morgan, Paola Vannucchi
Summary: When continents collide, fragments of seafloor can be trapped within the growing orogenic belt, forming a unique form of continental crust and lithosphere known as transmogrified basin. These basins, originally stronger blocks, will eventually become sites for continental rifting. In modern Asia, transmogrifying basins have played a significant role in the formation of mountain belts and the strengthening of the East Asian Monsoon.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Geology
Keith Priestley, Tak Ho, Dan McKenzie
Summary: New evidence from seismic tomography indicates a unique mineral fabric in the thick mantle lithosphere beneath ancient continental cratons, shedding light on the formation of these structures. This mineral fabric, revealed through surface-wave tomography, suggests a vertical alignment of olivine crystals at depths of -150 km within cratonic continental-lithosphere roots, likely a remnant from craton formation. Geochemical and petrological studies further support the stability of cratonic mantle roots due to reduced density caused by melt removal at shallower depths. This seismological fabric at -150 km provides evidence of the shortening event that created the cratonic roots.
Article
Geochemistry & Geophysics
Solvi Thrastarson, Dirk-Philip Van Herwaarden, Lion Krischer, Christian Boehm, Martin van Driel, Michael Afanasiev, Andreas Fichtner
Summary: This paper presents a new method of global-scale full-waveform inversion (FWI) that significantly reduces computational cost without sacrificing rigor. The method utilizes data-adaptation and application-oriented specialization on both simulation and measurement levels. The authors also demonstrate the effectiveness of the method by inverting seismic waveforms for 3-D whole-mantle structure and constructing a global FWI model.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Review
Astronomy & Astrophysics
Masaki Yoshida, Kazunori Yoshizawa
Summary: The influence of the continental lithosphere and its root on the continental drift is crucial in plate tectonics history, with stability determined by the viscosity contrast between the continental lithosphere and the underlying mantle. Orogenic belts or suture zones surrounding cratons act as a buffer to protect cratons and ensure longevity. The presence of low-viscosity asthenosphere reduces basal drag force, contributing to the stability and longevity of the cratonic lithosphere.
ANNUAL REVIEW OF EARTH AND PLANETARY SCIENCES, VOL 49, 2021
(2021)
Article
Geochemistry & Geophysics
Jesse Ray Reimink, Joshua H. F. L. Davies, Alessandro Ielpi
Summary: This passage emphasizes the importance of determining when continental masses emerged above the global ocean in understanding secular changes in crustal and Earth-surface processes. By analyzing the global detrital-zircon record, the study provides a new chronometer for tracking the emergence of continental crust throughout Earth's history.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Geochemistry & Geophysics
Tingzi Li, Mingming Jiang, Liang Zhao, Yang Chu, Weihua Yao, Bo Wan, Ling Chen, Yinshuang Ai, Thomas Bodin, Huaiyu Yuan
Summary: The lithospheric architecture of the South China Block provides key information on the formation and evolution of this region. Through the study of seismic anisotropy, the deformation history of the lithosphere and the origins and deformation processes of different blocks are revealed. These studies are of great significance for understanding the tectonic history of the South China Block.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geochemistry & Geophysics
Juliette Pin, Lyderic France, Sarah Lambart, Laurie Reisberg
Summary: This paper examines the evolution of compositional variability in continental mantle peridotites. Using a mixing model, the authors independently evaluate the impact of different parameters on the system's evolution and compare the results with observed peridotite suites. The study finds that the composition of the added melt plays a crucial role in the evolution of the rocks.
Article
Multidisciplinary Sciences
Carlos A. Guerra, Miguel Berdugo, David J. Eldridge, Nico Eisenhauer, Brajesh K. Singh, Haiying Cui, Sebastian Abades, Fernando D. Alfaro, Adebola R. Bamigboye, Felipe Bastida, Jose L. Blanco-Pastor, Asuncion de los Rios, Jorge Duran, Tine Grebenc, Javier G. Illan, Yu-Rong Liu, Thulani P. Makhalanyane, Steven Mamet, Marco A. Molina-Montenegro, Jose L. Moreno, Arpan Mukherjee, Tina U. Nahberger, Gabriel F. Penaloza-Bojaca, Cesar Plaza, Sergio Pico, Jay Prakash Verma, Ana Rey, Alexandra Rodriguez, Leho Tedersoo, Alberto L. Teixido, Cristian Torres-Diaz, Pankaj Trivedi, Juntao Wang, Ling Wang, Jianyong Wang, Eli Zaady, Xiaobing Zhou, Xin-Quan Zhou, Manuel Delgado-Baquerizo
Summary: Soils are fundamental for terrestrial ecosystems, but a global assessment of hotspots for soil nature conservation is still lacking, hindering the establishment of conservation priorities. A global field survey identified different ecological dimensions of soils in various regions of the planet, emphasizing the importance of accounting for the multidimensionality of soil for future conservation efforts.
Article
Engineering, Environmental
Xuesong Kong, Zhengzi Zhou, Limin Jiao
Summary: The study reveals that habitat loss in global biodiversity hotspots is mainly driven by agricultural land occupation and urban expansion. Some hotspots in developing countries face more severe issues with agricultural land occupation, while hotspots in developed nations are more threatened by urban expansion.
RESOURCES CONSERVATION AND RECYCLING
(2021)
Article
Multidisciplinary Sciences
Simon L. Klemperer, Ping Zhao, Colin J. Whyte, Thomas H. Darrah, Laura J. Crossey, Karl E. Karlstrom, Tianze Liu, Carmen Winn, David R. Hilton, Lin Ding
Summary: This study uses helium isotope data to reveal the geometry between the crustal plate and mantle in the continental collision of the Himalaya and Tibetan Plateau, answering the question of whether the crustal plate underplates or subducts into the mantle. The results show that the crustal plate underplates and comes into contact with the mantle at greater depths. The study also identifies a helium isotope boundary between the Indian crust and the Tibetan Plateau, which helps explain conflicting seismic interpretations.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Environmental Sciences
Mehri Davtalab, Steigvile Bycenkiene, Ieva Uoginte
Summary: In recent years, microplastics have become a prominent issue in both terrestrial and aquatic environments, drawing concerns from communities worldwide. This study conducted a comprehensive bibliometric analysis of publications from 1990 to 2022 to identify influential countries, authors, institutes, papers, and journals in the field of microplastics. The findings indicate a significant increase in the number of microplastic publications and citations in recent years, with an increase of 19 and 35 times since 2015. Additionally, a keyword analysis was performed to highlight the important keywords and clusters in this field, while the TF-IDF method was used to extract new keywords used in recent years, providing insights for future research directions.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Geochemistry & Geophysics
Valerie Maupin, Alexandra Mauerberger, Frederik Tilmann
Summary: The study analyzes the radial anisotropy in the upper mantle of the Fennoscandian Shield using joint inversion of Love and Rayleigh wave phase velocities. Similar radial anisotropy is found in subregions down to at least 200 km depth, with SH waves faster than SV by 2%-3%. Different types of olivine crystallographic preferred orientations (CPOs) are discussed in relation to seismic observations.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Engineering, Environmental
Soeun Eo, Sang Hee Hong, Young Kyoung Song, Gi Myung Han, Seongbong Seo, Young-Gyu Park, Won Joon Shim
Summary: This study investigated the distribution and characteristics of microplastics in dumping sites and surrounding areas in the Yellow Sea, South Sea, and East Sea of South Korea. The results showed varying levels of microplastic abundance, with higher concentrations found in the dumping sites. Industrial wastewater sludge was identified as a major source of microplastics. As the level of ocean dumping decreased over time, the abundance of microplastics also decreased. Spherical polystyrene was the dominant type of microplastic observed in sediments, especially in the dumping sites.
Article
Environmental Sciences
Dong Yan, You Tian, Zhiqiang Li, Hongli Li
Summary: This study investigated the 3D P-wave velocity structure of the crust and upper mantle beneath the Yarlung-Tsangpo suture using teleseismic tomography. The results revealed alternating low- and high-Vp anomalies beneath the Himalayan and Lhasa blocks across the YTS, indicating strong lateral heterogeneities in the region. Additionally, prominent low-Vp and high-Vp zones were observed beneath the Himalayan and Lhasa blocks respectively, suggesting the presence of rigid lithosphere and potential fragmentation of the underthrusting Indian continental lithosphere.
Article
Multidisciplinary Sciences
Amir Khan, Savas Ceylan, Martin van Driel, Domenico Giardini, Philippe Lognonne, Henri Samuel, Nicholas C. Schmerr, Simon C. Staehler, Andrea C. Duran, Quancheng Huang, Doyeon Kim, Adrien Broquet, Constantinos Charalambous, John F. Clinton, Paul M. Davis, Melanie Drilleau, Foivos Karakostas, Vedran Lekic, Scott M. McLennan, Ross R. Maguire, Chloe Michaut, Mark P. Panning, William T. Pike, Baptiste Pinot, Matthieu Plasman, John-Robert Scholz, Rudolf Widmer-Schnidrig, Tilman Spohn, Suzanne E. Smrekar, William B. Banerdt
Summary: By analyzing seismic data from Mars, researchers have constrained the planet's internal structure and thermochemical state, revealing that Mars has a thicker thermal lithosphere than Earth and a much higher enrichment of heat-producing elements in the crust than previously thought.
Article
Multidisciplinary Sciences
Simon C. Stahler, Amir Khan, W. Bruce Banerdt, Philippe Lognonne, Domenico Giardini, Savas Ceylan, Melanie Drilleau, A. Cecilia Duran, Raphael F. Garcia, Quancheng Huang, Doyeon Kim, Vedran Lekic, Henri Samuel, Martin Schimmel, Nicholas Schmerr, David Sollberger, Eleonore Stutzmann, Zongbo Xu, Daniele Antonangeli, Constantinos Charalambous, Paul M. Davis, Jessica C. E. Irving, Taichi Kawamura, Martin Knapmeyer, Ross Maguire, Angela G. Marusiak, Mark P. Panning, Clement Perrin, Ana-Catalina Plesa, Attilio Rivoldini, Cedric Schmelzbach, Geraldine Zenhausern, Eric Beucler, John Clinton, Nikolaj Dahmen, Martin van Driel, Tamara Gudkova, Anna Horleston, W. Thomas Pike, Matthieu Plasman, Suzanne E. Smrekar
Summary: The study found that Mars has a core radius of around 1830 +/- 40 kilometers, with a density of 5.7 to 6.3 grams per cubic centimeter. The martian mantle is mineralogically similar to Earth's upper mantle and transition zone, but lacks a bridgmanite-dominated lower mantle, suggesting a different geological structure. This also affects the seismic observations of potentially active regions on Mars.
Article
Geochemistry & Geophysics
P. Moulik, V Lekic, B. Romanowicz, Z. Ma, A. Schaeffer, T. Ho, E. Beucler, E. Debayle, A. Deuss, S. Durand, G. Ekstrom, S. Lebedev, G. Masters, K. Priestley, J. Ritsema, K. Sigloch, J. Trampert, A. M. Dziewonski
Summary: Global variations in the propagation of surface waves provide unique constraints on the source properties and structure of the Earth's mantle. This study aims to construct a reference data set of multimode dispersion measurements by reconciling large and diverse catalogues of surface wave dispersion. The study finds that the measurements of fundamental-mode dispersion are internally consistent, but the agreement deteriorates for overtones.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Multidisciplinary Sciences
Xiyuan Bao, Carolina R. Lithgow-Bertelloni, Matthew G. Jackson, Barbara Romanowicz
Summary: Research suggests that volcanic hotspots vary greatly in temperature, with some being extremely hot, some cold, and others not hot enough to actively upwell. Cold hotspots may originate from the upper mantle depth or be cooled by small-scale convection.
Review
Geochemistry & Geophysics
A. T. Ringler, R. E. Anthony, R. C. Aster, C. J. Ammon, S. Arrowsmith, H. Benz, C. Ebeling, A. Frassetto, W-Y Kim, P. Koelemeijer, H. C. P. Lau, J. P. Montagner, P. G. Richards, D. P. Schaff, M. Vallee, W. Yeck, V Lekic
Summary: Global seismographic networks (GSNs) have played a crucial role in advancing our understanding of Earth's structure and processes. Through international collaborations and technological advancements, GSNs have provided real-time and high-quality data for seismic studies, earthquake characterization, and environmental monitoring. The integration of GSN data with other geophysical data has further enhanced our ability to study and interpret seismic activities on a global scale.
REVIEWS OF GEOPHYSICS
(2022)
Article
Geochemistry & Geophysics
Isabelle Panet, Marianne Greff-Lefftz, Barbara Romanowicz
Summary: Understanding mantle flow is crucial for understanding the connection between deep Earth dynamics and global tectonics. This study analyzes derivatives of seafloor topography and gravity potential over the Pacific and Northern Indian ocean basins, revealing periodic undulations and identifying alignments with sub-lithospheric upper mantle mass excess and slow seismic velocity fingers. This suggests an intermediate scale of mantle convection below ocean basins, driven by lateral variations in composition. Further research is needed to investigate the nature of these mass excess sources and their relationship with slow seismic velocities.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Multidisciplinary Sciences
Quancheng Huang, Nicholas C. Schmerr, Scott D. King, Doyeon Kima, Attilio Rivoldini, Ana-Catalina Plesa, Henri Samuel, Ross R. Maguire, Foivos Karakostas, Vedran Lekic, Constantinos Charalambous, Max Collinet, Robert Myhill, Daniele Antonangeli, Melanie Drilleau, Misha Bystricky, Caroline Bollinger, Chloe Michaut, Tamara Gudkova, Jessica C. E. Irving, Anna Horleston, Benjamin Fernando, Kuangdai Leng, Tarje Nissen-Meyer, Frederic Bejina, Ebru Bozdag, Caroline Beghein, Lauren Waszek, Nicki C. Siersch, John-Robert Scholz, Paul M. Davis, Philippe Lognonne, Baptiste Pinot, Rudolf Widmer-Schnidrig, Mark P. Panning, Suzanne E. Smrekar, Tilman Spohn, William T. Pike, Domenico Giardini, W. Bruce Banerdt
Summary: Constraining the thermal and compositional state of the mantle is crucial for deciphering the formation and evolution of Mars. By analyzing seismic data collected by NASA's InSight Mission to Mars, researchers have detected a midmantle discontinuity, revealing information about the temperature and composition of Mars' mantle. This study suggests that the Martian mantle is colder and more iron-enriched compared to Earth's mantle.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Multidisciplinary Sciences
D. Kim, W. B. Banerdt, S. Ceylan, D. Giardini, V Lekic, P. Lognonne, C. Beghein, E. Beucler, S. Carrasco, C. Charalambous, J. Clinton, M. Drilleau, C. Duran, M. Golombek, R. Joshi, A. Khan, B. Knapmeyer-Endrun, J. Li, R. Maguire, W. T. Pike, H. Samuel, M. Schimmel, N. C. Schmerr, S. C. Stahler, E. Stutzmann, M. Wieczorek, Z. Xu, A. Batov, E. Bozdag, N. Dahmen, P. Davis, T. Gudkova, A. Horleston, Q. Huang, T. Kawamura, S. D. King, S. M. McLennan, F. Nimmo, M. Plasman, A. C. Plesa, I. E. Stepanova, E. Weidner, G. Zenhausern, I. J. Daubar, B. Fernando, R. F. Garcia, L. Posiolova, M. P. Panning
Article
Astronomy & Astrophysics
Jiaqi Li, Caroline Beghein, Paul Davis, Mark. A. Wieczorek, Scott M. M. McLennan, Doyeon Kim, Ved Lekic, Matthew Golombek, Martin Schimmel, Eleonore Stutzmann, Philippe Lognonne, William Bruce Banerdt
Summary: The shallowest layer beneath the Mars InSight Lander site has low seismic wave velocity due to high porosity and other lithological factors. The SsPp phase was detected on Mars for the first time, confirming the existence of an 8 km interface and a large wave speed contrast across it. The average P-wave speed in the top crustal layer was found to be between 2.5 and 3.2 km/s, providing a more precise estimate than previous studies.
EARTH AND SPACE SCIENCE
(2023)
Article
Geosciences, Multidisciplinary
C. Beghein, J. Li, E. Weidner, R. Maguire, J. Wookey, V Lekic, P. Lognonne, W. Banerdt
Summary: Scientists have observed two different types of wave signals in seismic events on Mars, which cannot be explained by a single model, indicating the presence of seismic anisotropy. They discuss various possible origins of these signals, including crystal orientation, crack alignment, impacts, and volcanic eruptions.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
D. Kim, S. C. Stahler, S. Ceylan, V. Lekic, R. Maguire, G. Zenhausern, J. Clinton, D. Giardini, A. Khan, M. P. Panning, P. Davis, M. Wieczorek, N. Schmerr, P. Lognonne, W. B. Banerdt
Summary: Using seismic recordings, we analyzed event S1222a to determine the shear velocity and radial anisotropic structure of the Martian crust. Our findings indicate a uniform vertically polarized shear velocity between 5 and 30 km depth, with a radial anisotropy of up to 12%. At a depth of approximately 63 +/- 10 km, a significant velocity increase suggests the presence of the crust-mantle boundary.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Multidisciplinary Sciences
Mathurin Dongmo Wamba, Jean-Paul Montagner, Barbara Romanowicz
Summary: The debate about whether the two large low-shear velocity provinces (LLSVPs) at the base of Earth's mantle are wide compact structures extending thousands of kilometers upward or bundles of distinct mantle plumes is highlighted by full waveform shear wave tomography of the deep mantle beneath the Indian Ocean. It reveals the presence of several separate broad low-velocity conduits anchored at the core-mantle boundary in the eastern part of the African LLSVP, most clearly beneath La Reunion and Comores hot spots. The deep plumbing system beneath these hot spots may resemble dyke and sills in crustal volcanic systems, but at a whole-mantle scale.
Article
Geosciences, Multidisciplinary
D. Kim, C. Duran, D. Giardini, A. -C. Plesa, S. C. Stahler, C. Boehm, V. Lekic, S. M. McLennan, S. Ceylan, J. F. Clinton, P. Davis, A. Khan, B. Knapmeyer-Endrun, M. P. Panning, M. Wieczorek, P. Lognonne, W. B. Banerdt
Summary: We observed Rayleigh waves that orbit around Mars up to three times after the S1222a marsquake. By averaging these signals, we found the largest amplitude signals with central periods of 30 and 85 s, propagating at different group velocities of 2.9 and 3.8 km/s, respectively. The thickness of the Martian crust is 42-56 km on average, thicker than the crusts of Earth and Moon, suggesting that it plays a significant role in the thermal evolution and local melt zones within Mars.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Multidisciplinary Sciences
Jessica C. E. Irving, Vedran Lekic, Cecilia Duran, Melanie Drilleau, Doyeon Kim, Attilio Rivoldini, Amir Khan, Henri Samuel, Daniele Antonangeli, William Bruce Banerdt, Caroline Beghein, Ebru Bozdag, Savas Ceylan, Constantinos Charalambous, John Clinton, Paul Davis, Raphael Garcia, Domenico Giardini, Anna Catherine Horleston, Quancheng Huang, Kenneth J. Hurst, Taichi Kawamura, Scott D. King, Martin Knapmeyer, Jiaqi Li, Philippe Lognonne, Ross Maguire, Mark P. Panning, Ana-Catalina Plesa, Martin Schimmel, Nicholas C. Schmerr, Simon C. Staehler, Eleonore Stutzmann, Zongbo Xu
Summary: We have observed seismic waves propagating through the core of Mars for the first time and used these observations to construct the first seismically constrained models for Mars' core properties. By measuring the travel times of the core-transiting seismic phase SKS and performing probabilistic inversions, we have obtained information about the bulk modulus, density, and composition of Mars' core. Our models suggest a smaller and denser core compared to previous estimates, with a P-wave velocity of 4.9 to 5.0 km/s at the core-mantle boundary.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Astronomy & Astrophysics
Kristel Izquierdo, Vedran Lekic, Laurent G. J. Montesi
Summary: Gravity inversions have made significant contributions to our understanding of planetary body interiors and their formation processes. A novel global gravity inversion algorithm called THeBOOGIe is introduced in this study, which is capable of inferring density anomalies within the crust and mantle of planetary bodies at a global scale. By incorporating Bayesian approach and prior geological/ geophysical information, THeBOOGIe overcomes the non-uniqueness challenge in gravity inversions and accurately detects deep mantle density anomalies. Moreover, it provides complementary information to seismic models by constraining non-spherically symmetric density anomalies.
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)
