Tectonophysics最新文献

{"title":"Strain-rate evolution in the European Alps due to Glacial Isostatic Adjustment since the Last Glacial Maximum","authors":"Fernando Linsalata ,&nbsp;Daniele Melini ,&nbsp;Giorgio Spada","doi":"10.1016/j.tecto.2026.231094","DOIUrl":"10.1016/j.tecto.2026.231094","url":null,"abstract":"<div><div>Current vertical movements in the Alpine region are the result of several interacting processes operating simultaneously. Among these, Glacial Isostatic Adjustment (GIA) plays a key role as a long-term global process driven by interactions between the cryosphere, solid Earth, and oceans in response to the melting of continental ice sheets. Although the effects of GIA in the Alpine region have been the subject of numerous studies, considerable uncertainties remain, in particular regarding the extent and chronology of the Würm Alpine Ice Sheet and the rheological properties of the mantle. In this study, we take advantage of recently updated deglaciation chronologies for Late-Pleistocene ice sheets to refine estimates of GIA-induced crustal deformation. We model postglacial rebound using the open-source TABOO code in combination with a high-resolution Alpine ice model, incorporating a mini-ensemble approach to account for uncertainties in the rheological model. We also calculate the deformation components in the study area using the VISR code, allowing a detailed assessment of the evolution of the deformation rate. Our modeling shows that GIA-related strain rates reached a maximum of 7.8 nstrain yr⁻¹ at 25 kyr BP and progressively decreased throughout the Holocene, approaching present-day values of only 0.25 nstrain yr⁻¹. This long-term decay indicates that the Alpine GIA signal is now largely exhausted, leaving only a weak residual contribution to the modern deformation field. The combined use of the TABOO code, the Alpine ice model, and the VISR code allows us to robustly quantify the evolution of the GIA-driven deformation rates and improve our understanding of post-glacial crustal dynamics and provide new constraints for future geodynamic models in the Alpine region.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"924 ","pages":"Article 231094"},"PeriodicalIF":2.6,"publicationDate":"2026-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146015032","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Late quaternary eruption history of the Tatun Volcano Group (Taiwan) – new constraints from zircon double-dating and 40Ar/39Ar dating of lava flows in Mt. Shamao","authors":"Karl D. Jabagat ,&nbsp;Yuan-Hsi Lee ,&nbsp;Martin Danišík ,&nbsp;Daniel Miggins ,&nbsp;Mei-Fei Chu ,&nbsp;Yu-Ming Lai ,&nbsp;Yun-Chieh Lo ,&nbsp;Po-Tsun Lee ,&nbsp;Cheng-Horng Lin","doi":"10.1016/j.tecto.2026.231083","DOIUrl":"10.1016/j.tecto.2026.231083","url":null,"abstract":"<div><div>Growing evidence for an active magmatic system beneath the Tatun Volcano Group (TVG) in northern Taiwan has heightened efforts to understand its eruption history. Accurately constraining the timing of past eruptions is essential for evaluating volcanic hazards, particularly given the TVG's proximity to the densely populated Taipei metropolitan area. However, previous studies have yielded inconsistent results, underscoring the need for robust and reliable geochronological methods. This study aims to constrain the age and eruption history of the Shamao lava dome, which is considered the youngest eruptive product in the TVG, by applying a zircon double-dating approach that combines U<img>Th disequilibrium and (U<img>Th)/He methods, alongside high-precision ⁴⁰Ar/³⁹Ar groundmass dating. Zircon U<img>Th disequilibrium data constrain the maximum eruption age of Mt. Shamao to 16.3 ± 1.2 ka and reveal both protracted crystallization of zircon spanning ca. 200 ka and distinct age clusters at ca. 23, 60, and 117 ka, with some grains in secular equilibrium (&gt;300 ka). These older populations coincide with other magmatic events in the TVG, suggesting zircon inheritance or the tapping of a long-lived, interconnected magma reservoir with episodic pulses. Zircon (U<img>Th)/He dating yields a late Pleistocene eruption age of 16.3 ± 4.9 ka, consistent with a new groundmass ⁴⁰Ar/³⁹Ar plateau age of 15.0 ± 6.3 ka and previously reported radiocarbon ages indicating eruptive activity between ca. 23 and 13 ka<strong>.</strong> These results challenge earlier interpretations of Holocene volcanism in Mt. Shamao (i.e. at 1.3 ka) and highlight the reliability of integrated geochronological techniques for dating young volcanic rocks. While additional data are required to refine eruption recurrence models, this study provides a critical foundation for improving volcanic hazard assessments and risk mitigation strategies in northern Taiwan.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"924 ","pages":"Article 231083"},"PeriodicalIF":2.6,"publicationDate":"2026-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145957000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cenozoic cooling and exhumation history of Southern Ecuador: The role of plate-boundary reorganizations and inboard tectonic conditions","authors":"Leidy Carolina Sandoval-Espinel ,&nbsp;Massimiliano Zattin ,&nbsp;Mauricio A. Bermúdez ,&nbsp;Cesar Witt ,&nbsp;Jorge Iglesias ,&nbsp;Maria Jose Hernández","doi":"10.1016/j.tecto.2026.231086","DOIUrl":"10.1016/j.tecto.2026.231086","url":null,"abstract":"<div><div>The cooling and exhumation history of orogens along subduction systems provides unique constraints on regional tectonic evolution, reflecting the interplay between crustal deformation and plate convergence dynamics. Southern Ecuador lies within a transitional zone between the northern and central Andes, where contrasting tectonic histories have generated variations in inherited crustal architecture that influence how regional plate-boundary forcing is expressed in the upper plate. We present new apatite fission-track thermochronology data from seventeen plutonic rock samples across five crustal blocks in southern Ecuador: Western Cordillera, Eastern Cordillera, Intermontane basins, Celica-Lancones, and Amotape-Tahuin. Our results show that cooling ages are internally consistent within each block but differ across them, revealing a pattern of diachronous exhumation in most blocks. Some blocks instead record pronounced post-magmatic cooling, suggesting shallow pluton emplacement. Thermal history modeling, based on good-fit time–temperature paths indicates that regional exhumation initiated in the middle Eocene and persisted thereafter. The cooling trajectories group into three distinct, albeit partially overlapping, intervals: ∼45–38 Ma (middle - late Eocene), ∼40–30 Ma (late Eocene – early Oligocene), and ∼ 33–25 Ma (Oligocene). We interpret this protracted and spatially variable exhumation as reflecting changes in the boundary conditions of the subduction system, including a transition from oblique to more orthogonal convergence and increases in convergence rates during the Cenozoic. However, the observed spatial variability is more directly linked to the progressive re-activation of major fault systems and, locally, to magmatic activity.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"924 ","pages":"Article 231086"},"PeriodicalIF":2.6,"publicationDate":"2026-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145995716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Formation of sedimentary and tectonic mélanges during seamount subduction: new insights from analog modeling","authors":"Tatiana Tkáčiková,&nbsp;Jiří Žák","doi":"10.1016/j.tecto.2026.231085","DOIUrl":"10.1016/j.tecto.2026.231085","url":null,"abstract":"<div><div>This study presents three sets of scaled ‘sandbox’ experiments designed to understand the formation of mélanges during seamount subduction, focusing, in particular, on the role of talus aprons and moat basins, i.e., loose block accumulations around seamounts formed on the seafloor prior to subduction. In the first set of experiments, subduction of a single seamount increases wedge taper, inducing slumping of previously accreted material and producing sedimentary mélanges. Increasing the slab dip enhances off-scraping of material from the seamount's leading side, deposition on the rear side, and apron incorporation into the wedge interior. The second set simulates the subduction of a seamount chain, leading to wedge thickening, increased mass wasting, and the formation of a layered mélange-bearing unit between the seamounts. The third set simulates oceanic plateau-wedge interactions, resulting in increased mass wasting on the wedge's surface and the formation of sedimentary mélanges. Loose blocks are deposited along the plateau surface and incorporated into the wedge along shear zones, creating tectonic mélanges. In conclusion, our results indicate that sedimentary and tectonic mélanges form during seamount subduction, especially from the surrounding talus. Sedimentary mélanges are deposited at the wedge surface through sliding and mixing of blocks with a terrigenous matrix, while the tectonic mélanges result from intense shear deformation along the seamount/wedge interface. When compared with seismic profiles across modern accretionary wedges, our findings also suggest that the often-observed chaotic reflections may represent previously unrecognized seamount-derived mélanges, however, their type is difficult to establish just from geophysical data.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"924 ","pages":"Article 231085"},"PeriodicalIF":2.6,"publicationDate":"2026-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145956998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Seismic source parameters analysis in Southeastern Alps and associated tectonic implications","authors":"L. Moratto,&nbsp;F. Abdi,&nbsp;A. Saraò","doi":"10.1016/j.tecto.2026.231069","DOIUrl":"10.1016/j.tecto.2026.231069","url":null,"abstract":"<div><div>We present a comprehensive analysis of earthquake source parameters in the Southeastern Alps, a tectonically complex region located at the junction of the Eastern Alps and the Dinarides. Using single station spectral inversion of S-wave displacement spectra from 1521 well-recorded earthquakes (1.3 ≤ <em>M</em>_<em>W</em> ≤ 4.3) occurring between 2016 and 2023, we estimated seismic moment, corner frequency, static stress drop, apparent stress, radiated energy, and seismic efficiency. Our results reveal a small deviation from self-similar scaling condition, with static stress drop values ranging mostly from 0.1 to 10 MPa (median ≈ 0.84 MPa) and apparent stress stabilizing above 1 MPa for moderate events. The Savage-Wood efficiency values suggest a dominant overshoot rupture regime, indicating that only a fraction of the available stress is radiated as seismic energy. The spatial patterns of stress drop and attenuation correlate with the underlying tectonic domains. Regions characterized by strong, competent crust exhibit higher stress drops and lower attenuation, whereas areas with fractured, fluid-rich fault zones show lower stress drops and stronger attenuation. This study highlights the value of high-resolution spectral analysis and dense seismic networks for characterizing rupture processes and provides a new regional reference dataset for ground motion prediction and seismic hazard assessment in Southeastern Alps and comparable intraplate environments.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"923 ","pages":"Article 231069"},"PeriodicalIF":2.6,"publicationDate":"2026-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145957002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Polyphasic deformation during the evolution of the southern Central Andes: Insights from the La Ramada fold-thrust belt (32°-32°30′S)","authors":"Nicolás Alejandro Peluffo ,&nbsp;Lucas Martín Fennell ,&nbsp;Sarah Ellen Thomas ,&nbsp;Federico Exequiel Martos ,&nbsp;Victor Valencia ,&nbsp;Andrés Folguera ,&nbsp;Maximiliano Naipauer","doi":"10.1016/j.tecto.2026.231070","DOIUrl":"10.1016/j.tecto.2026.231070","url":null,"abstract":"<div><div>This work presents an update of the evolution of the La Ramada fold-thrust belt (∼32°S-32°30′S), located in a remote area of the Principal Cordillera of Argentina, integrating two measured stratigraphic sections, novel field observations, and three new zircon U<img>Pb ages: two detrital and one igneous. Our new stratigraphic framework includes Paleocene to Miocene sedimentary and volcanic rocks, a period previously interpreted as a hiatus in the area. This sheds light on an enigmatic stage in the evolution of the Andes at these latitudes. We describe the Teatinos Formation, a sedimentary unit with a maximum depositional age of 11.2 ± 0.2 Ma at its base. These rocks were deposited in the Teatinos Basin, a newly defined piggyback basin developed within the Principal Cordillera, representing the innermost expression of the Miocene Andean foreland basin system at these latitudes. A new U<img>Pb crystallization age of 19.1 ± 0.5 Ma, obtained from a sill intruding ∼900 m of volcanic rocks, confirms the presence of the late Eocene - early Miocene Abanico Formation in an anomalous position, up to 5 km east of the eastern boundary of the Abanico Basin. This boundary is represented in our area by the Major Andean Fault, a first-order structure that juxtaposes rocks of the western Principal Cordillera over the Teatinos Formation. We also present a new maximum depositional age of 145.2 ± 1.5 Ma from sedimentary rocks in the hanging wall of this fault. These are overlain by the Abanico Formation, defining a &gt; 100 Myr hiatus compatible with the existence of a pre-Oligocene contractional event. We propose a polyphasic evolution for the La Ramada fold-thrust belt involving at least three contractional pulses: one pre-Oligocene and two during the Miocene (ca. 22–18 Ma and ca. 12–9 Ma).</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"923 ","pages":"Article 231070"},"PeriodicalIF":2.6,"publicationDate":"2026-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145956975","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tectonics of East Indian Subcontinent: As derived from Integrated Gravity Anomalies of India, Bangladesh, Bay of Bengal and Myanmar Regions","authors":"J.V. Rama Rao ,&nbsp;Ravi Kumar Bandi ,&nbsp;T.R.K. Chetty","doi":"10.1016/j.tecto.2025.231061","DOIUrl":"10.1016/j.tecto.2025.231061","url":null,"abstract":"<div><div>The East Indian Subcontinent (EISC) is a geologically complex region recording tectonic evolution from the Proterozoic era to the present. This study integrates terrestrial, marine, and satellite gravity data across ∼5 million sq. km covering eastern India, Bangladesh, the Bay of Bengal, and Myanmar, along with earthquake incidences from the past 120 years to unravel the tectonic framework of the region.</div><div>A Key focus of this study is building the interrelations among major Proterozoic orogenic belts—Central Indian Tectonic Zone (CITZ), Eastern Ghats Mobile Belt (EGMB), Chhotanagpur Granite Gneissic Complex (CGGC), and Shillong Meghalaya Gneissic Complex (SMGC). From this study, we propose a possible eastern boundary of the CITZ marked as Lucknow–Varanasi–Ranchi lineament, highlight the remarkable affinities between eastern CGGC and EGMB, and redefine the Eastern Continental Margin of India.</div><div>Gravity analysis delineates the disposition of collision zones of EISC besides inferring five tectonic domains of EISC, crustal boundaries, plate margins, and transitions from continental to oceanic crust. It also reveals heterogeneity over submarine ridges and the segmentation of the India–Myanmar subduction zone. Aseismic central segment, bounded by cross-faults, is an explicit inference of our study about current Indo-Australian plate subduction dynamics beneath the Sunda–Myanmar Plate.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"923 ","pages":"Article 231061"},"PeriodicalIF":2.6,"publicationDate":"2026-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145915294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Holocene surface-rupturing earthquakes on the Matano fault in the Mahalona basin, Sulawesi, Indonesia","authors":"Adi Patria ,&nbsp;Muhammad Hanif ,&nbsp;Anggraini Rizkita Puji","doi":"10.1016/j.tecto.2026.231084","DOIUrl":"10.1016/j.tecto.2026.231084","url":null,"abstract":"<div><div>The Matano fault in Sulawesi, Indonesia, accommodates the left-lateral motion between the Pacific and Australian plates, and it poses a high seismic hazard. We investigated past surface-rupturing earthquakes on the Ponsoa segment of the Matano fault in the Mahalona basin through an integration of tectonic geomorphic observation, ground-penetrating radar (GPR) survey, and paleoseismic investigation. Adjacent to the paleoseismic trench site, the Ponsoa segment is characterized by a ∼0.5–2-m-high north-facing fault scarp on a young fluvial terrace. The GPR profile acquired crossing the fault scarp shows the associated subsurface structures to a depth of ∼10 m. The trench revealed evidence of two surface-faulting events with timing constrained at 891–1113 CE and 1035–1425 CE. Correlating these findings with paleoseismic events on the Geresa segment suggests a multi-segment earthquake rupture scenario involving the eastern half of the Matano fault (∼145 km long) with a probable magnitude (Mw) of ∼7.6 and a recurrence interval of ∼294–444 years. This study highlights the significance of paleoseismic investigations for seismic hazard assessment, particularly in establishing the rupture extent and recurrence interval of large surface-rupturing earthquakes.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"923 ","pages":"Article 231084"},"PeriodicalIF":2.6,"publicationDate":"2026-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145956999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"From fabric to process: An integrated study of deformed quartz-rich carbonates","authors":"Maria Eleni Taxopoulou ,&nbsp;Marine Lartigau ,&nbsp;Charles Aubourg ,&nbsp;Nicolas E. Beaudoin ,&nbsp;Elli-Maria Charalampidou ,&nbsp;Jean Paul Callot","doi":"10.1016/j.tecto.2025.231034","DOIUrl":"10.1016/j.tecto.2025.231034","url":null,"abstract":"<div><div>This study investigates the presence and nature of diffuse deformation in a low-porosity carbonate rock that underwent polyphase tectonics and contains a network of veins, tectonic stylolites, and deformation bands. By using a non-destructive methodology based on Electron Backscatter Diffraction, X-ray computed tomography, coupled with results from Anisotropy of Magnetic Susceptibility and the Fry technique, we examine the grain fabric and strain distribution within the rock. Our investigation reveals evidence of quartz reorientation with respect to the polyphase contractional history of the area. Several mechanisms of quartz reorientation were proposed, including rigid reorientation during rotation and diffusion-related processes. The coexistence of ductile and brittle deformation mechanisms in the carbonate matrix indicates a complex response to compaction which can be recorded by the matrix, but does not appear to have a direct effect on the actual amount of shortening, as this is predominantly affected by the deformation bands. Our findings highlight the complexity of strain accommodation, with diffuse deformation creating subtle variations in grain size, shape, and orientation within the carbonate matrix. The study enhances our understanding of deformation processes in poly-deformed carbonate rocks and provides valuable insights into the geological context of the studied locations, by using a novel technique that can be useful for gaining qualitative and quantitative information from the rock samples. However, linking specific reorientation mechanisms to individual tectonic events remains challenging due to the multifaceted nature of deformation processes operating over different magnitudes and timescales.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"923 ","pages":"Article 231034"},"PeriodicalIF":2.6,"publicationDate":"2026-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145731865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Corrigendum to “Delineation of crustal structure and composition in the Northwest Himalaya and adjoining Indo-Gangetic Plain” [Tectonophysics 904 (2025) 230717]","authors":"Amlanjyoti Das ,&nbsp;Devajit Hazarika ,&nbsp;Pritom Neog ,&nbsp;Naresh Kumar ,&nbsp;Dilip Kumar Yadav","doi":"10.1016/j.tecto.2026.231098","DOIUrl":"10.1016/j.tecto.2026.231098","url":null,"abstract":"","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"923 ","pages":"Article 231098"},"PeriodicalIF":2.6,"publicationDate":"2026-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146072705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}