Article
Multidisciplinary Sciences
Thomas P. Ferrand, Elena F. Manea
Summary: This study investigates the intermediate-depth seismicity in Vrancea, Eastern Romania, and suggests that the destabilization of mantle and crustal minerals may contribute to the observed seismic activity, with a higher correlation found in mantle minerals. The research demonstrates that the seismicity in Vrancea is evidence of the current dehydration of an oceanic slab beneath Romania, supporting the idea of a recent rollback of a W-dipping oceanic slab with limited delamination of the continental Moesian lithosphere.
SCIENTIFIC REPORTS
(2021)
Article
Geochemistry & Geophysics
Mengyu Wu, Hongda Wang, Shane Zhang, Michael H. Ritzwoller
Summary: In this study, a new 3D shear wave speed (V-S) model is generated using seismic surface wave data to explore the relationship between uppermost mantle structure and plate age for the Juan de Fuca and Gorda plates. The findings suggest that conductive cooling is the primary control on lithospheric structure, but there are exceptions near plate boundaries indicating advective heat transport and hydrothermal circulation. In the asthenosphere, a non-monotonic slow-fast-slow V-S pattern is observed with the presence of partial melt beneath the mid-ocean ridge and subduction trench.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geochemistry & Geophysics
Zhong-Jie Bai, Hong Zhong, Wei-Guang Zhu, Wen-Jun Hu
Summary: This study investigates the generation of the Emeishan large igneous province (ELIP) and associated Fe-Ti-V oxide deposits by analyzing the geochemical and isotopic data of rocks in this province. The results suggest that the ELIP may have formed through the interaction between a mantle plume, subducted oceanic crust, and overlying marine sediment. This study provides important insights into the origin of volcanic rocks and ore deposits.
Article
Geochemistry & Geophysics
Mingming Li
Summary: This study utilizes 3D high-resolution geodynamic models to investigate the dynamics of subducted oceanic crust (SOC) in the lowermost mantle. The segregation and accumulation of SOC near the core-mantle boundary (CMB) are found to be greatly influenced by the morphology of the subducted slab. SOC segregation is more efficient when the slab is folded backward and extends beneath the subducting plate, allowing direct contact with the CMB. Changes in slab morphology result in significant temporal and spatial variations in SOC distribution at the CMB and within the lowermost mantle, explaining the variations of seismic anomalies outside the large-low velocity provinces (LLVPs).
PHYSICS OF THE EARTH AND PLANETARY INTERIORS
(2023)
Article
Geochemistry & Geophysics
Youqiang Yu, Zhiguo Xu, Stephen S. Gao, Kelly H. Liu, Jia Gao
Summary: The South China Sea is a hydrocarbon-rich major marginal sea in the western Pacific Ocean. Its formation may have been driven by slab-pull, with evidence of significant thickening of the subducted slab beneath the southern margin, supporting the existence of the Proto-South China Sea. Chemically and rheologically heterogeneous materials from the slab segments may have generated layered structures and dehydration melting.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Multidisciplinary Sciences
Fabrizio Nestola, Margo E. E. Regier, Robert W. W. Luth, D. Graham Pearson, Thomas Stachel, Catherine McCammon, Michelle D. D. Wenz, Steven D. D. Jacobsen, Chiara Anzolini, Luca Bindi, Jeffrey W. W. Harris
Summary: The introduction of volatile-rich subducting slabs to the mantle creates large redox gradients, affecting various geological processes. A study on diamonds from Kankan, Guinea reveals the presence of enstatite, ferropericlase, and a highly magnesian olivine inclusion, indicating the formation under highly variable redox conditions near the 660 km seismic discontinuity. The proposed model suggests that the formation of these minerals is driven by dehydration, rehydration, and dehydration processes occurring in the underside of a warming slab at the transition zone-lower mantle boundary.
Article
Geochemistry & Geophysics
Kun-Feng Qiu, Jun Deng, Crystal Laflamme, Zheng-Yu Long, Ruo-Qi Wan, Frederic Moynier, Hao-Cheng Yu, Jing-Yuan Zhang, Zheng-Jiang Ding, Richard Goldfarb
Summary: Orogenic gold deposits account for a significant portion of global gold resources, and determining their origin is crucial for prospecting new deposits. The Jiaodong gold province in China provides an opportunity to study the gold source due to its unique geological setting. By analyzing sulfur isotopes in pyrite grains from multiple gold deposits in the region, it was found that Archean metasedimentary rocks are not a source reservoir for sulfur and gold. Instead, the isotopically heavy S suggests a contribution from a subducted oceanic slab and its sediments. The release of gold and sulfur during subduction-related metamorphism played a crucial role in the formation of these giant orogenic gold deposits.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Multidisciplinary Sciences
Huijuan Li, Joerg Hermann, Lifei Zhang
Summary: The element ratios in global primitive arc basalts are found to be similar to those of sediment and/or oceanic crustal melts, rather than aqueous fluids or melange melts. This suggests that slab melt is primarily responsible for element recycling to the arc.
Article
Geosciences, Multidisciplinary
Colton Lynner, Jonathan R. Delph, Daniel E. Portner, Susan L. Beck, Eric Sandvol, A. Arda Ozacar
Summary: This study investigates the deformation of the African Plate beneath the Anatolian Plate in the eastern Mediterranean. Using shear wave splitting measurements, the authors examine patterns of mantle flow around the edges of a fragmenting African slab segment. They identify three distinct regions of shear wave splitting that correspond to the segmentation boundaries of the slab. Additionally, the study reveals regional coherent mantle flow near the eastern and western edges of the slab, with an area of null splitting near the easternmost edge, likely caused by mantle upwelling due to the displacement of asthenosphere.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geology
Mihai N. Ducea, Claire A. Currie, Constantin Balica, Iuliana Lazar, Ananya Mallik, Lucian Petrescu, Mihai Vlasceanu
Summary: The study focuses on the pathways of large carbonate platforms during subduction in the Tethys realm of Europe. Research shows that most carbonate detaches from the subducting slab, rises diapirically through the mantle wedge, and mixes with the mantle lithosphere. A smaller portion gets accreted under the forearc, while an even smaller fraction descends deeper into the mantle.
Article
Geochemistry & Geophysics
Chuansong He
Summary: It has been suggested that the upwelling of a mantle plume led to the formation of the Emeishan large igneous province (ELIP). However, recent geological and seismological studies have challenged this idea. This investigation reveals a slab-like high-velocity structure associated with the subduction of the lithosphere of the Palaeo-Tethys Ocean (LPTO) and demonstrates imprints of the LPTO on the 410- and 660-km discontinuities. Comprehensive analysis suggests that the LPTO may have induced large-scale mantle upwelling, contributing to the formation of the ELIP.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geosciences, Multidisciplinary
Zachary C. Eilon, Lun Zhang, James B. Gaherty, Donald W. Forsyth, Joshua B. Russell
Summary: This study provides observational support for small-scale convective rolls beneath the oceanic plates. The study found alternating upper mantle velocity anomalies aligned with gravity lineations beneath the seafloor. These anomalies, likely caused by temperature variations and possible partial melting, are strongest in deeper regions, indicating rapid vertical motions through a low-viscosity asthenospheric channel.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Haonan Gan, Guiling Wang, Bo Wang, Xiao Wang, Wenjing Lin, Gaofan Yue, Xianfeng Tan
Summary: Subducted remnant slabs are important in the geodynamics and evolution of the Earth. This study provides new high-quality data on terrestrial heat flow in East Asia, revealing the thermal structure and thickness of the lithosphere in the region.
Article
Geochemistry & Geophysics
QunFan Zheng, Huai Zhang, Qin Wang, Zhen Zhang, YaoLin Shi
Summary: Since the Late Mesozoic, South China has experienced complicated crust-mantle deformation due to India-Eurasia convergence and the subduction of the Philippine Sea plate. Analyzing asthenospheric anisotropy and flow pattern helps to understand the deep tectonic evolution and mantle dynamics of South China. The asthenosphere contributes to seismic anisotropy in the east part of South China with dominant SE trending. In the middle segment of the north-south tectonic belt, predicted anisotropy shows approximately N-S trends. The subduction of the Philippine Sea plate to the Eurasia plate extends to the mantle transition zone and induces mantle flow.
CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
(2023)
Article
Geochemistry & Geophysics
Chengcheng Zhao, Takashi Yoshino, Baohua Zhang
Summary: The input of redox from subducted slab into mantle is crucial for the deep cycle and isotopic evolution of volatile elements. By investigating the redox kinetics of olivine, it is found that the oxidation and reduction processes are diffusion-controlled. The oxidation process is independent of oxygen fugacity, while the reduction process is dependent on oxygen fugacity. The presence of magnetite affects the redox process.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
A. Christian Stanciu, Raymond M. Russo, Victor I. Mocanu, Paul M. Bremner, Sutatcha Hongsresawat, Megan E. Torpey, John C. VanDecar, David A. Foster, John A. Hole
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2016)
Correction
Geochemistry & Geophysics
Stephanie R. James, Elizabeth J. Screaton, Raymond M. Russo, Mark P. Panning, Paul M. Bremner, A. Christian Stanciu, Megan E. Torpey, Sutatcha Hongsresawat, Matthew E. Farrell
GEOPHYSICAL JOURNAL INTERNATIONAL
(2017)
Article
Geochemistry & Geophysics
Stephanie R. James, Elizabeth J. Screaton, Raymond M. Russo, Mark P. Panning, Paul M. Bremner, A. Christian Stanciu, Megan E. Torpey, Sutatcha Hongsresawat, Matthew E. Farrell
GEOPHYSICAL JOURNAL INTERNATIONAL
(2017)
Article
Geochemistry & Geophysics
K. K. Davenport, J. A. Hole, B. Tikoff, R. M. Russo, S. H. Harder
Editorial Material
Geochemistry & Geophysics
B. Tikoff, J. Vervoort, J. A. Hole, R. Russo, R. Gaschnig, A. Fayon
Article
Geochemistry & Geophysics
A. Gallego, R. M. Russo, D. Comte, V. Mocanu, R. E. Murdie, J. C. VanDecar
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2013)
Article
Geosciences, Multidisciplinary
R. M. Russo
Article
Geochemistry & Geophysics
A. C. Stanciu, R. M. Russo, V. I. Mocanu, L. Munteanu
JOURNAL OF GEODYNAMICS
(2013)
Article
Geochemistry & Geophysics
Paul M. Bremner, Mark P. Panning, R. M. Russo, Victor Mocanu, A. Christian Stanciu, Megan Torpey, Sutatcha Hongsresawat, John C. VanDecar, Todd A. LaMaskin, D. A. Foster
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2019)
Article
Geochemistry & Geophysics
Anne Meltzer, Joshua C. Stachnik, Demberel Sodnomsambuu, Ulziibat Munkhuu, Baasanbat Tsagaan, Mungunsuren Dashdondog, Raymond Russo
SEISMOLOGICAL RESEARCH LETTERS
(2019)
Article
Geochemistry & Geophysics
Diana Comte, Marcelo Farias, Steven Roecker, Raymond Russo
EARTH AND PLANETARY SCIENCE LETTERS
(2019)
Article
Geosciences, Multidisciplinary
E. E. Rodriguez, R. M. Russo
Article
Geochemistry & Geophysics
Haipeng Luo, Boudewijn Ambrosius, Raymond M. Russo, Victor Mocanu, Kelin Wang, Michael Bevis, Rui Fernandes
EARTH AND PLANETARY SCIENCE LETTERS
(2020)
Article
Geology
Raymond M. Russo, Haipeng Luo, Kelin Wang, Boudewijn Ambrosius, Victor Mocanu, Jiangheng He, Thomas James, Michael Bevis, Rui Fernandes
Summary: The geographic coincidence of the Chile Ridge slab window and the Patagonia ice fields provides a unique opportunity to assess the effects of slab window rheology on glacial isostatic adjustment. Using newly collected or processed geodetic data, the study found that the mass loss of the ice fields since the Little Ice Age caused varying rates of crustal uplift, with the North Patagonia ice field experiencing 12-24 mm/yr uplift and the South Patagonia ice field reaching a maximum of 41 mm/yr. A three-dimensional viscoelastic finite element model was used to analyze the GIA response, revealing that the viscosity of the northern part of the slab window is approximately one order of magnitude lower than that of the southern part.
Article
Geosciences, Multidisciplinary
Walid Ben-Mansour, Douglas A. Wiens, Hannah F. Mark, Raymond M. Russo, Andreas Richter, Eric Marderwald, Sergio Barrientos
Summary: Geological processes in Southern Patagonia are influenced by the Patagonian slab window formed by the subduction of the Chile Ridge and the northward migration of the Chile Triple Junction. The study reveals the presence of a warm, low-viscosity shallow mantle channel just south of the Nazca slab, leading to fast mantle flow and the formation of a volcanic gap.
GEOPHYSICAL RESEARCH LETTERS
(2022)