Article
Geochemistry & Geophysics
Mualla Cengiz
Summary: There are several models regarding the deformation history of the Pontides in North Anatolia during the Cretaceous period, which depend on the positions of the Istanbul and Sakarya zones, the consumption of the northern branches of the Neotethys ocean, and the rifting of several sub-basins. This study examined samples from different geological periods and found significant rotations in the Istanbul and Sakarya zones during the Early and Late Cretaceous periods, indicating the closure of the Intra-Pontide ocean and the collision between the two zones. However, the northern margin of the Pontides remained stable during the Middle Eocene.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
Shiva Arvin, Farhad Sobouti, Keith Priestley, Abdolreza Ghods, Khalil Motaghi, Frederik Tilmann, Tuna Eken
Summary: The shear wave splitting analysis in NW Iran reveals consistent average splitting delay times and fast directions, mainly controlled by the motion of lithosphere relative to the deeper mantle. However, near the tectonic boundaries of central Iran with NW Iran and the Alborz, the fast directions of SK(K)S waves tend to align with major geological structures.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Yingfeng Zhang, Xinjian Shan, Wenyu Gong, Guohong Zhang
Summary: The paper quantitatively demonstrates the main reason for the ambiguous InSAR-based models and identifies that the key to differentiate between these models is to resolve the small asymmetry in surface deformation patterns. Research shows that it is impossible to uniquely determine the dip orientation of thrust earthquakes with M-w < 6.0 and depth > 5.0 km using InSAR data at typical noise levels in mountain belts.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Taco Broerse, Nemanja Krstekanic, Cor Kasbergen, Ernst Willingshofer
Summary: The article discusses the application of Particle Image Velocimetry (PIV) in simulating geological deformation processes, focusing on the development of strain tensors and qualitative description of large shape changes. Combining Hencky strains is found to provide a meaningful classification of large 2-D strains, accurately mapping deformation in analogue models of lithospheric deformation.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Mahin Jafari, Mahtab Aflaki, Zahra Mousavi, Andrea Walpersdorf, Khalil Motaghi
Summary: The Ganaveh earthquake occurred on April 18, 2021 in the southwest of the Dezful embayment, Iran. It was a mainly compressive event with a magnitude of M-w 5.8. The InSAR coseismic displacement maps showed a maximum surface displacement of 17 cm in the satellite line of sight. The earthquake occurred within the competent layers of the Zagros sedimentary cover, beneath the Gachsaran formation.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geosciences, Multidisciplinary
A. Burton-Johnson, T. R. Riley, R. J. Harrison, C. Mac Niocaill, J. R. Muraszko, P. D. Rowley
Summary: This paper applies magnetic fabric analyses to plutons of the East Pacific continental arc. The study reveals that continental arc magmatism exhibits strong episodic characteristics and is associated with enhanced interplate coupling and fast subduction. Magmatic flare-ups typically occur during periods of increased tectonic compression and cease when the compression reduces or becomes extensional. The enhanced magmatic flux can be attributed to crustal thickening leading to partial melting of a newly accreted, hydrous mafic underplate, enhanced melt segregation in the source, or the lithostatic compression becoming the weakest compressive force, facilitating magma extraction and ascent from the mantle.
Article
Geochemistry & Geophysics
Trond Ryberg, Christian Haberland, Britta Wawerzinek, Manfred Stiller, Klaus Bauer, Alberto Zanetti, Luca Ziberna, Gyoergy Hetenyi, Othmar Muntener, Michael M. Weber, Charlotte M. Krawczyk
Summary: We present new findings from a seismic experiment conducted in the deepest part of the Val Sesia crust-mantle section in the Ivrea-Verbano zone in the Italian Alps. The experiment revealed a tilted, complete section of the continental crust containing gabbros and peridotites. By using inversion methods, a 3D P-wave velocity model was created, showing a sharp velocity change across the Insubric Zone. The prominent feature of the model is a high-velocity body interpreted as peridotite, which challenges previous models and suggests a reevaluation of the dimension of peridotite material in the area.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
Umar Farooq Jadoon, Baochun Huang, Qian Zhao, Syed Anjum Shah, Yasin Rahim
Summary: The Kohistan Island Arc is located in the northwestern region of the Himalayan Mountains and has been a topic of controversy regarding its formation, collision with plate boundaries, and evolution. A palaeomagnetic study on the Jutal dykes in the northeastern part of the KIA revealed pyrrhotite and magnetite as the magnetic carrier minerals, suggesting a post-folding origin for the magnetic components.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Sven Dannemann, Erwin Appel, Wolfgang Roesler, Udo Neumann, Ursina Liebke, Debarati Nag
Summary: Understanding the pre-collisional extent of Greater India is crucial for studying the India-Asia collision and the formation of the Himalayan-Tibetan orogen. This study provides new insights into the extent of Greater India through paleomagnetic research on the Dibling limestone in Zanskar. However, discrepancies in existing data highlight the need for further paleomagnetic work in the Tethyan Himalaya.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
Norbert R. Nowaczyk
Summary: The study conducted experiments on diluted slurry prepared from natural glacial Black Sea sediments, revealing a slightly non-linear function relationship between magnetization and magnetic field in the artificial samples used. Normalization calculations showed that all samples exhibit a typical magnetic fabric of natural sediments with an anisotropy range of 6-7%.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geosciences, Multidisciplinary
Jonathan Poh, Philippe Yamato, Thibault Duretz, Denis Gapais, Patrick Ledru
Summary: Orogens are traditionally classified into ancient-style tectonics and modern-style tectonics, with different characteristics in terms of structural features. The transition from ancient to modern-style tectonics is controlled by parameters such as crustal strength, rheology, temperature, and strain rate. The study shows that when the maximum of crustal strength exceeds 300 MPa, modern-style tectonics occur, while a maximum crustal strength below 300 MPa leads to ancient-style tectonic structures.
Article
Geosciences, Multidisciplinary
Wang-Ping Chen
Summary: The article summarizes the spatial patterns of seismic faulting in northeastern Asia, identifying the characteristics of active deformation in the region and analyzing the seismic activity in different areas.
EARTH-SCIENCE REVIEWS
(2021)
Editorial Material
Geosciences, Multidisciplinary
Tiago M. Alves, Julie Tugend, Simon Holford, Claudia Bertoni, Wei Li
Summary: The geological processes responsible for the formation of continental margins are complex and vary between different margins and adjacent sedimentary basins. Understanding these processes is crucial for determining the economic potential of continental margins.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Jincheng Ma, Hans-Peter Bunge, Andreas Fichtner, Sung-Joon Chang, You Tian
Summary: Knowledge of lithospheric structure is crucial to comprehend how continental collision and oceanic subduction affect surface tectonic configurations. By using full-waveform tomographic images, scientists have discovered lateral heterogeneities and anisotropy in the lithosphere and asthenosphere of Asia. Estimations of lithospheric thickness based on seismic velocity reductions have shown significant variations among different tectonic units. The thickest cratonic roots are found beneath the Sichuan, Ordos, and Tarim basins, as well as central India. Radial anisotropy signatures from 11 representative tectonic provinces reveal the diverse nature and geodynamic processes of their past and present deformations. The extensive deformation of the continental lithosphere is characterized by low-velocity anomalies stretching from the Himalayan Orogen to the Baikal rift zone in central Asia, accompanied by crustal thickening after collision. The presence of a horizontal low-velocity layer at depths of approximately 100-300 km beneath the lithosphere suggests the existence of the asthenosphere beneath East and Southeast Asia, with varying anisotropy indicative of channel flows.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geochemistry & Geophysics
Andrea R. Biedermann, Michele Pugnetti, Yi Zhou
Summary: Magnetic pore fabric (MPF) can be represented by the magnetic anisotropy exhibited by ferrofluid-impregnated samples, predicting the relationship between flow direction and pore shape. There is a strong dependence of anisotropy parameters on the ferrofluid type and concentration, and measurement conditions have a significant impact on the results.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)