Article
Geosciences, Multidisciplinary
Dapeng Zhao
Summary: Recent studies on seismic imaging of the Northwest Pacific and East Asian region have revealed significant lateral heterogeneities in the crust and upper mantle, shedding new light on various geological processes such as volcanism, earthquake mechanisms, and mantle dynamics. Significant advancements in seismic imaging techniques, particularly tomographic inversions for 3-D distribution of seismic anisotropy and attenuation, have provided important insights into lithospheric deformation, mantle convection, and the processes associated with plate subductions.
EARTH-SCIENCE REVIEWS
(2021)
Article
Geochemistry & Geophysics
Maoliang Zhang, Sheng Xu, Xiaocheng Zhou, Antonio Caracausi, Yuji Sano, Zhengfu Guo, Guodong Zheng, Yun-Chao Lang, Cong-Qiang Liu
Summary: A mantle degassing transect has been identified in the southeastern Tibetan Plateau, extending from the India-Asia continental convergent margin to an intra-continent extensional region. Variations in volatile geochemistry of hydrothermal gases along this transect suggest modification by secondary physico-chemical processes.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Geosciences, Multidisciplinary
Andrew J. Parsons, Karin Sigloch, Kasra Hosseini
Summary: Distributions of slabs in Earth's mantle are used to reconstruct past subduction zones, with a focus on understanding non-vertical slab motions that occur prior to slab break-off. Research reveals that lateral migration of the Indian slab, driven by vertical subduction of the Australian slab, plays a significant role in plate reconstructions after collision between the Indian and Australian plates. The sinking behaviors of individual slabs are influenced by other slabs in the same plate network, indicating the importance of interpreting slab sinking behavior collectively in relation to plate kinematics.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geosciences, Multidisciplinary
Chaoyang Liu, Xuanlong Shan, Jian Yi, Yunqian Shi, Guido Ventura
Summary: This study investigates the evolution of volcanism and the transition to the post-rift stage in the Songliao Basin in northeastern China. The results reveal the geochemical characteristics of volcanic rocks and shed light on the processes involved in the continental rifting.
Article
Geosciences, Multidisciplinary
Ziqiang Lu, Jianshe Lei
Summary: This study reveals the complex variations in the crust and uppermost mantle along the Tanlu fault zone using a high-resolution shear-wave velocity model, which is related to the collision and subduction between the North China Craton and Yangtze Plate.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geochemistry & Geophysics
Helen Gall, Tanya Furman, Barry Hanan, Biltan Kurkcuoglu, Kaan Sayit, Tekin Yurur, Megan Pickard Sjoblom, Erdal Sen, Pinar Alici Sen
Summary: Quaternary mafic lavas in Central Anatolia provide geochemical insights into melt generation processes following regional delamination of the subducted Tethyan slabs. The new geochemical data indicate contributions from subduction-modified lithospheric and sub-lithospheric source domains, suggesting significant contribution from metasomatic phases and input from a spatially heterogeneous mantle with contributions from depleted MORB-like and recycled sediment sources. The geochemical similarities to Miocene alkali basalts from other regions in Anatolia imply a regional scale geological process following Tethys subduction.
Article
Geochemistry & Geophysics
Tao Xu, Yinshuang Ai, Chenglong Wu, Ling Chen, Enbo Fan, Long Li, Weiyu Dong
Summary: By quantifying the shear wave splitting parameters captured by three seismic arrays in Northeast China, we studied the origin of intraplate volcanism and found a toroidal pattern of anisotropy beneath the Songliao Basin. The high-density seismic array revealed that the Pacific subduction and lithospheric foundering processes controlled the genesis of late Cenozoic volcanism in Northeast China.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geosciences, Multidisciplinary
Laurent Michon, Vincent Famin, Xavier Quidelleur
Summary: Through studying the East African Rift System, we have found a complex spatial and temporal relationship between rift and magmatic activity, leading to the identification of two distinct regimes of volcanism in the rift system.
EARTH-SCIENCE REVIEWS
(2022)
Article
Geochemistry & Geophysics
Xuran Liang, Dapeng Zhao, Yuanyuan Hua, Yi-Gang Xu
Summary: We present high-resolution 3-D tomographic models of the mantle dynamics beneath the central and eastern United States (CEUS). The models reveal the layered North American Craton, strong anisotropy related to the deeply subducted Farallon slab and passage of the Bermuda hotspot, as well as low-velocity anomalies and seismic anisotropy beneath intraplate seismic zones. The deep subduction of the Farallon plate and the passage of the Bermuda hotspot are the most critical dynamic processes that have contributed to the formation of the seismic zones in the CEUS.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
William J. Shinevar, Eva M. Golos, Oliver Jagoutz, Mark D. Behn, Robert D. van der Hilst
Summary: The continental lithospheric mantle beneath the United States exhibits lateral variations in temperature, with a range of 800-900 degrees C at depths of 60, 80, and 100 km. The eastern region is generally cooler (350-850 degrees C at 60 km), while the western region is hotter (typically >1000 degrees C at 60 km, >1200 degrees C at 80-100 km). The chemical depletion predicted by WISTFUL does not fully compensate for the density difference caused by temperature. Oscillatory convection may be occurring in the lithosphere below the United States, with alternating cycles of cooling, densification, and sinking, followed by reheating and rising.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geochemistry & Geophysics
Fenitra Andriampenomanana, Andrew A. Nyblade, Michael E. Wysession, Raymond J. Durrheim, Frederik Tilmann, Guilhem Barruol, Gerard Rambolamanana, Tsiriandrimanana Rakotondraibe
Summary: The lithosphere of Madagascar has undergone a long series of tectonic processes, from the Pan-African Orogeny to extensional tectonic and magmatic events. Studies show complex lateral variations in seismic velocity and anisotropy within the uppermost mantle, reflecting the tectonic history and thermal perturbations.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
N. Bulut, H. Thybo, V Maupin
Summary: This study presents a P-wave velocity model of the upper mantle in Fennoscandia obtained from finite-frequency body-wave tomography. The model reveals a strong negative velocity anomaly in Norway, which may provide isostatic support to the high topography of the Scandinavian mountain range. Additionally, strong positive velocity anomalies are observed around the southern Bothnian Bay and the Baltic Sea.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
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
Geochemistry & Geophysics
Chiara Civiero, Sergei Lebedev, Nicolas L. Celli
Summary: Hot plumes rising from Earth's deep mantle can cause uplift, rifting, and the formation of large igneous provinces (LIP). Through new technology, researchers have discovered hot, partially molten rock corridors in the East Africa-Arabia region, which are fed by three mantle upwellings. This suggests that complex-shaped plume heads can explain the scattered volcanism in broad areas and may be an inherent feature of plume-continent interaction.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Article
Geochemistry & Geophysics
Jiayu Ma, Li Sun, Weilai Wang, Jianping Wu, Xiaoxin Wang, Lianxing Wen
Summary: We construct a high-resolution Pn-velocity model in continental China and analyze the major Pn-velocity features related to tectonic processes. The model integrates a large data set of Pn travel times and differential travel times, yielding a spatial resolution ranging from 0.75 degrees x 0.75 degrees to 3 degrees x 3 degrees.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)