Review
Geosciences, Multidisciplinary
Tapos Kumar Goswami, Devojit Bezbaruah, Bashab Nandan Mahanta, Ranjan Kumar Sarmah
Summary: Significant variations in deformation style, crustal shortening rate, erosion, and exhumation are observed in the eastern Himalayan orogen. The Main Central Thrust is a major thrust system in the region, where significant crustal shortening has been estimated. The interplay of erosion and exhumation, as well as the role of transverse structures in dividing the mountain range into different sectors with diverse structural geometries, are key factors in understanding the geological processes in the region.
PHYSICS AND CHEMISTRY OF THE EARTH
(2021)
Article
Geosciences, Multidisciplinary
Lei Zhao, Yi Zou, Pinghua Liu, Weiqing Sun, Rucheng Zhang, Ligang Zhou, Mingguo Zhai
Summary: The occurrence of high-grade basement rocks in ancient continental blocks provides evidence for the operation of early plate tectonics. The Jiaobei Terrane in the North China Craton is an ideal study area to investigate the variations in metamorphic grade and the emplacement of basement rocks. The research on this terrane is of great importance due to its significance in understanding plate tectonics.
EARTH-SCIENCE REVIEWS
(2023)
Article
Geochemistry & Geophysics
Jakub Kryl, Petr Jerabek, Ondrej Lexa
Summary: The study of the Erzgebirge dome reveals different microstructural types associated with continuous deformation and decompression processes, shedding light on the formation mechanism of the orogenic wedge.
Article
Geosciences, Multidisciplinary
Constantin D. Athanassas, Dimitrios Papanikolaou, Sarah Falkowski, Ioannis D. Papanikolaou, Dimitrios Ntokos
Summary: New thermochronometric data from the Pindos fold-and-thrust belt (PFTB) suggest two phases of geodynamic evolution during the Cenozoic: an early heating event between 40-20 Ma and a later cooling phase from 20 Ma onwards. The heating is linked to structural thickening of the PFTB, while the cooling is associated with uplift and exhumation, becoming widespread in Erymanthos by 9 Ma.
GEOLOGICAL JOURNAL
(2021)
Article
Geography, Physical
Andres Echaurren, Alfonso Encinas, Lucia Sagripanti, Guido Gianni, Patricio Zambrano, Paul Duhart, Andres Folguera
Summary: During the long-term evolution of orogenic belts like the Andes, it is not well understood to what extent their different components, the fore-to-retroarc domains, are deformed together or separately. In this study, new field and seismic data of the Chilean forearc at Chiloe Island latitude were integrated with retroarc structure to visualize the crustal architecture in the north Patagonian margin. The results show a coupling of fore-to-retroarc behavior during certain periods, which ceased during the Pliocene due to glaciations. The study also reveals different mechanisms controlling the forearc basins during late Cenozoic changing tectonic conditions.
GLOBAL AND PLANETARY CHANGE
(2022)
Article
Geochemistry & Geophysics
T. S. Waldien, S. M. Roeske, R. Chatterjee, P. B. O'Sullivan, D. F. Stockli
Summary: In this study, the relationship between lateral slip gradients and splay thrust faults on the Alaskan earthquake fault is investigated. The research shows that there is a lateral slip gradient along the fault line, which is caused by fault bends and splay faults, resulting in surface uplift. The study of the Denali fault in Alaska reveals the long-term coevolution of slip gradients and splay thrust faults.
Article
Geosciences, Multidisciplinary
Zhiwu Li, Peter J. J. Kamp, Shugen Liu, Ganqing Xu, Kui Tong, Martin Danisik, Zijian Wang, Jinxi Li, Bin Deng, Bo Ran, Yuehao Ye, Wenhui Wu
Summary: The current structural model for the Longmen Shan belt is an asymmetric orogenic wedge with northwest-dipping thrust faults. The debate lies in how the exhumation of this margin was partitioned into Cretaceous versus Late Cenozoic components. New low-temperature thermochronology data suggests two episodes of exhumation, one during the Late Cretaceous and the other during the Late Cenozoic. A new feature is the large amount of exhumation southeast of the Longriba Fault System, diminishing the asymmetric character of the current structural model.
EARTH-SCIENCE REVIEWS
(2023)
Article
Geochemistry & Geophysics
E. Ryan, S. Papeschi, G. Viola, G. Musumeci, F. Mazzarini, E. Torgersen, B. E. Sorensen, M. Ganerod
Summary: The E-vergent Northern Apennines were formed by the convergence and subduction of Adria beneath Europe during the Oligocene-Miocene period. Post-orogenic extension played a crucial role in the exhumation of the belt's inner domain high-pressure/low-temperature rock units. The Acquadolce Subunit in the Eastern Elba nappe stack experienced early syn-orogenic exhumation from blueschist- to greenschist-facies conditions through a combination of W-directed extension and E-directed thrusting.
Article
Geochemistry & Geophysics
F. Martinez, C. Lopez, C. Torres, R. Gonzalez, M. Pena
Summary: This study presents a regional-scale cross-section model of the Andean forearc at 26 degrees S, based on integrated data from multiple sources. The results indicate that Late Permian-Jurassic half-graben structures related to continental rifting and mid-Cenozoic reverse and thrust faults were the primary mechanisms of tectonic evolution in this region.
Article
Geochemistry & Geophysics
Lingzhu Kong, Yingde Jiang, Karel Schulmann, Jian Zhang, Roberto F. Weinberg, Min Sun, Sheng Wang, Tan Shu, Jun Ning
Summary: The structural and metamorphic effects of a Devonian extension-shortening cycle in the NW Chinese Altai were investigated. The study revealed the presence of a sub-horizontal metamorphic fabric (S1) and identified the age and timing of the extension and shortening phases. The findings suggest that the cycles of extension and contraction in the Altai range could result from alternating retreating and advancing subduction.
Article
Geosciences, Multidisciplinary
Sarah N. Heinlein, Terry L. Pavlis, Ronald L. Bruhn
Summary: The study evaluates the kinematics of the Ragged Mountain fault in Alaska, USA, using high-resolution three-dimensional terrain models. It suggests that the uphill-facing normal fault scarps along the fault may represent extension above a buried thrust ramp. Through detailed geomorphic mapping and theoretical modeling, the study analyzes the relationship between thrust displacement, upper-plate extension, and ramp dip, providing insights into the active tectonics of the region.