Tectonophysics最新文献_第8页

Paul Tapponnier, deciphering the Earth's crust deformation history in the rocks and landscapes Paul Tapponnier，在岩石和地貌中破译地壳变形历史

IF 2.9 3区地球科学

Tectonophysics Pub Date : 2026-01-22 DOI: 10.1016/j.tecto.2026.231099

A. Replumaz, J.-P. Avouac, M.-L. Chevalier, Y. Klinger, C. Lasserre, P.H. Leloup, J. Liu-Zeng, G. Peltzer, J. van der Woerd, X. Xiwei

引用次数: 0

Seismogenic and rheological behaviours from time-dependent analysis of earthquake depth distribution in the Corinth Rift 科林斯裂谷地震深度分布时变分析的发震和流变特征

IF 2.6 3区地球科学

Tectonophysics Pub Date : 2026-01-12 Epub Date: 2025-11-27 DOI: 10.1016/j.tecto.2025.231008

A. Septier , J. Déverchère , J. Perrot , A. Renouard

{"title":"Seismogenic and rheological behaviours from time-dependent analysis of earthquake depth distribution in the Corinth Rift","authors":"A. Septier , J. Déverchère , J. Perrot , A. Renouard","doi":"10.1016/j.tecto.2025.231008","DOIUrl":"10.1016/j.tecto.2025.231008","url":null,"abstract":"<div><div>Understanding earthquake depth distribution is critical for improving seismogenesis models. While the spatiotemporal pattern of earthquakes is well studied, transient changes in depth distribution remain poorly explored. In this study, we investigate how crustal rheological parameters influence the depth of earthquakes through time, focusing on the Corinth rift, a well-monitored region experiencing a high-level seismic activity in a homogeneous extensional stress field.</div><div>To calculate crustal yield strength profiles, we compile geophysical and geological data, including heat flow, rock compositions and properties, Moho depth and strain rate. These estimates are then compared to a high-quality 11-year seismic catalogue of the region. An inversion approach is applied to identify crustal layers associated with persistent versus sporadic seismicity defined here instead of the conventional background versus clustered seismicity.</div><div>Our time analysis reveals that the persistent seismicity nicely matches the theoretical brittle–ductile transition and allows us to confidently define the seismogenic thickness, while sporadic seismicity is clustered at depths associated with swarm occurrences. Both distributions are subject to kilometre-scale changes after magnitude 4.0 – 5.5 earthquakes, evidencing a relaxation process even after moderate magnitude events. We conclude that in specific case studies aiming to compare depth distribution and yield strength in the crust, the application of declustering methods may not be optimal for examining the potential rheological controls on earthquake depth distribution and their temporal variations. Instead, the analysis of persistent and sporadic seismicity defined in this study is more accurate and reliable than a declustering approach and offers new and valuable insights for this comparison.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"919 ","pages":"Article 231008"},"PeriodicalIF":2.6,"publicationDate":"2026-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145611972","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}

引用次数: 0

Slow slip events in Mexico: A historical perspective 墨西哥慢滑事件：一个历史的视角

IF 2.6 3区地球科学

Tectonophysics Pub Date : 2026-01-12 Epub Date: 2025-11-16 DOI: 10.1016/j.tecto.2025.230978

Víctor M. Cruz-Atienza , Sara Franco , Vladimir Kostoglodov , Josué Tago , Ekaterina Kazachkina , Jorge Real , Carlos Villafuerte , Raymundo Plata-Martínez

{"title":"Slow slip events in Mexico: A historical perspective","authors":"Víctor M. Cruz-Atienza , Sara Franco , Vladimir Kostoglodov , Josué Tago , Ekaterina Kazachkina , Jorge Real , Carlos Villafuerte , Raymundo Plata-Martínez","doi":"10.1016/j.tecto.2025.230978","DOIUrl":"10.1016/j.tecto.2025.230978","url":null,"abstract":"<div><div>This paper introduces a historical catalogue of slow slip events (SSE) for the Mexican subduction zone. The catalogue incorporates all 25 SSEs recorded since they were discovered in 1997. The inversion of GPS data for ten SSEs in Guerrero and five in Oaxaca reveals a clear slow slip segmentation along the Middle America Trench, with slip maxima between 30 and 40 km depth in both regions. SSEs in Guerrero are significantly larger, with <span><math><msub><mi>M</mi><mi>w</mi></msub><mo>=</mo><mn>7.14</mn><mo>±</mo><mn>0.18</mn></math></span> and a duration of <span><math><mn>10.3</mn><mo>±</mo><mn>6.5</mn></math></span> months, whereas in Oaxaca, <span><math><msub><mi>M</mi><mi>w</mi></msub><mo>=</mo><mn>6.84</mn><mo>±</mo><mn>0.16</mn></math></span> with a duration of <span><math><mn>7.0</mn><mo>±</mo><mn>4.3</mn></math></span> months. Such discrepancy results from the subhorizontal geometry of the Cocos Plate in Guerrero, which favors a more extensive SSE habitat. The extent and along-strike segmentation of SSEs appear to be structurally controlled by the subduction of the Orozco and O'Gorman fracture zones. For the inversions, we used consistent GPS data processing that preserves the North American reference frame and the actual SSEs crustal rebounds. All data were curated to minimize seasonal noise, and interpreted throughout the ELADIN inversion method. Five of the six most recent M7+ earthquakes in the region were preceded and most likely triggered by an SSE. This earthquake cluster began in 2012 after a 17-year period of quiescence, during which large SSEs occurred. While the SSEs appear to be necessary for initiating large ruptures, this is not enough until sufficient energy has regionally accumulated in the subduction zone. The Mexican seismic record since 1800 suggests that every ∼15 years the subduction zone reaches a critical state in which SSEs become large earthquake precursors.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"919 ","pages":"Article 230978"},"PeriodicalIF":2.6,"publicationDate":"2026-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145531304","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}

引用次数: 0

Hot orogeny during flat-slab subduction decouples upper plate from basal tractions 平板俯冲期间的热造山运动使上部板块与基底牵引力分离

IF 2.6 3区地球科学

Tectonophysics Pub Date : 2026-01-12 Epub Date: 2025-11-20 DOI: 10.1016/j.tecto.2025.231009

Andrew V. Zuza , Dominik R. Vlaha , Terry Lee , Wenrong Cao

{"title":"Hot orogeny during flat-slab subduction decouples upper plate from basal tractions","authors":"Andrew V. Zuza , Dominik R. Vlaha , Terry Lee , Wenrong Cao","doi":"10.1016/j.tecto.2025.231009","DOIUrl":"10.1016/j.tecto.2025.231009","url":null,"abstract":"<div><div>During plate convergence, shallow subduction or underthrusting of the lower-plate lithosphere beneath an overriding plate often results in far-field intraplate deformation, as observed in the Late Cretaceous–Paleogene North American Laramide or Cenozoic Himalayan-Tibetan orogen. Perplexingly, during this shallow-slab process, wide expanses of crust between the plate boundary and intraplate orogen do not experience significant synchronous deformation. These apparently undeformed crustal regions may reflect (1) a strong, rigid plate, (2) increased gravitational potential energy (GPE) to resist shortening and uplift, or (3) decoupling of the upper-plate lithosphere from any basal tractions. Here we review the geology of three orogens that formed due to flat slab subduction or underthrusting: the Himalayan-Tibetan, Mesozoic southeast China, and Laramide orogens. These orogens all involved intraplate deformation >1000-km from the plate boundary, large regions of negligible crustal shortening between the plate-boundary and intra-plate thrust belts, hot crustal conditions within the hinterland regions, and extensive upper-plate porphyry copper mineralization. A hot and weak hinterland is inconsistent with it persisting as an undeformed rigid block. GPE analysis suggests that hinterland quiescence is not uniquely due to thickened crust and elevated GPE, as exemplified by shallow marine sedimentation with low surface elevations in SE China. Comparison of these intracontinental orogens allows us to advance a general model, where hot orogenic hinterlands with a weak, mobile lower crust allow decoupling from underlying basal tractions exerted from flat-slab or underthrusting events. This hypothesis suggests that basal tractions locally drive intraplate orogens, at least partially controlled by the strength of the upper-plate lithosphere.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"919 ","pages":"Article 231009"},"PeriodicalIF":2.6,"publicationDate":"2026-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145560229","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}

引用次数: 0

A reconstruction of the last 50 My of South-East Asia's tectonic history 东南亚近50年来构造史的重建

IF 2.6 3区地球科学

Tectonophysics Pub Date : 2026-01-12 Epub Date: 2025-11-04 DOI: 10.1016/j.tecto.2025.230981

Bernard Montaron , Paul Tapponnier , Anne Briais , Philippe Hervé Leloup

{"title":"A reconstruction of the last 50 My of South-East Asia's tectonic history","authors":"Bernard Montaron , Paul Tapponnier , Anne Briais , Philippe Hervé Leloup","doi":"10.1016/j.tecto.2025.230981","DOIUrl":"10.1016/j.tecto.2025.230981","url":null,"abstract":"<div><div>We present 2-D reconstructions representing the extended version of the continental extrusion model, on which late Paul Tapponnier worked with the co-authors, and which provides a coherent mechanism for the origin of most major faults and basins in South-East Asia, in the last 50 My. In that model, the northward progression of India within Asia induces the nucleation and motion along a series of major strike-slip faults allowing the extrusion to the southeast of slices of Sundaland. Along the faults, and at their tips, pull-apart basins form, corresponding to the basins around Sundaland. From ~46 Ma, a first NNE trending right-lateral fault opens the Mergui basin. From ∼42 until 32 Ma, five NW-SE left-lateral faults activate from SW to NE extruding blocks toward the SE, allowing the formation of the Pattani, Malay, Tonle Sap, Yinggehai, and Natuna-Rajang pull-apart Basins, and terminating in the Makassar, Nam Con Son, Cuu Long Basins and the South China Sea. The faults are the Three Pagodas, Wang Chao, Tonle Sap, and the Ailao Shan - Red River shear zones. After ∼15 Ma extrusion stops in Sundaland and migrates further north. A major tectonic reorganization follows on land with offshore inversion of motion of several microplates, initiating a thrust of Borneo over the southern margin of the South China Sea, forming a sedimentary prism often misinterpreted as evidence for subduction of a proto-South China Sea. We discuss how the motion on strike-slip faults resulting from India-Asia collision explains most of the rifting and seafloor spreading in the region.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"919 ","pages":"Article 230981"},"PeriodicalIF":2.6,"publicationDate":"2026-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145434700","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}

引用次数: 0

Prolonged early cretaceous crustal extension in the eastern Lhasa Terrane: A multiphase magmatic record (∼134–103 Ma) from the Bomi-Chayu batholith 拉萨地体东部早白垩世延长的地壳伸展：波米-察峪岩基多期岩浆记录(~134 ~ 103 Ma

IF 2.6 3区地球科学

Tectonophysics Pub Date : 2026-01-12 Epub Date: 2025-11-21 DOI: 10.1016/j.tecto.2025.231011

Yihu Zhang , Dongliang Liu , Xuxuan Ma , Haibing Li , Guilong Mi , Xunzhang Zhu , Wang Li

{"title":"Prolonged early cretaceous crustal extension in the eastern Lhasa Terrane: A multiphase magmatic record (∼134–103 Ma) from the Bomi-Chayu batholith","authors":"Yihu Zhang , Dongliang Liu , Xuxuan Ma , Haibing Li , Guilong Mi , Xunzhang Zhu , Wang Li","doi":"10.1016/j.tecto.2025.231011","DOIUrl":"10.1016/j.tecto.2025.231011","url":null,"abstract":"<div><div>The Early Cretaceous (133–109 Ma) Bomi-Chayu batholith in the easternmost Lhasa terrane provides key insights into crustal growth and tectonic evolution, yet its petrogenesis and geodynamic setting remain contentious. Integrated petrographic, geochronological, geochemical, and isotopic analyses of three granitic suites identify crystallization ages of 134.3 Ma, 116.7–118.0 Ma, and 102.6–102.8 Ma, extending the known duration of regional magmatism. The ∼134 Ma and ∼103 Ma granites are classified as A2-type, formed under high-temperature, low-pressure settings. The ∼134 Ma biotite monzogranites show enriched isotopic compositions, suggesting derivation from ancient crustal sources. In contrast, the ∼103 Ma monzogranites exhibit decoupled ε<sub>Nd</sub>(t)-ε<sub>Hf</sub>(t) values, consistent with dehydration remelting of ancient crust. The ∼117 Ma granitoid suit is synchronous with a regional magmatic flare-up. The granodiorites in this stage display I-type affinities, with enriched Sr-Nd but relatively depleted zircon Hf isotopes. Geochemical and isotopic trends indicate hybridization between mantle-derived melts (represented by coeval gabbrodiorites and basalts) and crustal components (represented by coeval biotite monzogranites), followed by fractional crystallization and minor upper-crustal contamination. Magmatic types and isotopic compositions correlate the Bomi-Chayu batholith with the magmatic belt in the central Lhasa terrane. The two-stage A-type granites, together with synchronous I-S-type granitoids and bimodal volcanism, provide robust evidence for prolonged crustal extension in the eastern Lhasa terrane (at least the Bomi-Chayu area) during ∼134–103 Ma. We interpret this extensional regime as the result of slab rollback of the northward subducted Neo-Tethyan oceanic lithosphere.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"919 ","pages":"Article 231011"},"PeriodicalIF":2.6,"publicationDate":"2026-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145567543","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}

引用次数: 0

Receiver function and gravity inversion of the Moho depth beneath the Baltic states 波罗的海海底莫霍深度的接收函数和重力反演

IF 2.6 3区地球科学

Tectonophysics Pub Date : 2026-01-12 Epub Date: 2025-11-27 DOI: 10.1016/j.tecto.2025.231012

Viesturs Zandersons, Jānis Karušs

{"title":"Receiver function and gravity inversion of the Moho depth beneath the Baltic states","authors":"Viesturs Zandersons, Jānis Karušs","doi":"10.1016/j.tecto.2025.231012","DOIUrl":"10.1016/j.tecto.2025.231012","url":null,"abstract":"<div><div>We present a detailed analysis of crustal thickness across the Baltic States using two geophysical methods: receiver function (RF) analysis and gravity inversion. We calculate P-wave RFs for sixteen broadband seismic stations and estimate Moho depths using both standard and sedimentary layer corrected H-k stacking. RF results show crustal thicknesses in the range from 35.5 km in northern Latvia to 55.7 km in southeastern Lithuania and northern Estonia, with corresponding <span><math><mrow><msub><mrow><mi>V</mi></mrow><mrow><mi>p</mi></mrow></msub><mo>/</mo><msub><mrow><mi>V</mi></mrow><mrow><mi>s</mi></mrow></msub></mrow></math></span> ratios between 1.70 and 1.86. These results are broadly aligned with established Proterozoic tectonic domains and prior deep seismic sounding (DSS) profiles.</div><div>Gravity inversion is performed using a terrain-corrected and spectrally filtered Bouguer anomaly field derived from WGM2012, constrained by DSS and RF-derived Moho depths. A two-layer crust-mantle tesseroid model is optimised using cross-validation and grid search. The resulting gravity-derived Moho depth varies from 44 to 49 km, with a standard deviation of 4.39 km compared to seismic estimates. Major residuals of over 10 km are observed over the Kurzeme Batholith and the West Estonian domain, highlighting the limitations of the two-layer model in regions with complex crustal architecture.</div><div>We argue for a cautious interpretation of tectonic boundaries derived solely from potential field data. Our findings support the need for a new DSS transect and integrated gravity-seismic modelling to better constrain intra-crustal structure, especially in central Latvia, southern Lithuania and northwestern Estonia where current models show significant discrepancies.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"919 ","pages":"Article 231012"},"PeriodicalIF":2.6,"publicationDate":"2026-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145611974","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}

引用次数: 0

A data-driven approach to estimating the heat flow distribution in Mexico 估算墨西哥热流分布的数据驱动方法

IF 2.6 3区地球科学

Tectonophysics Pub Date : 2026-01-12 Epub Date: 2025-11-17 DOI: 10.1016/j.tecto.2025.231005

Heng Zhang , Yiheng Cai , Shinan Lang , Xiangbin Cui , Xiaoqing Zhang

{"title":"A data-driven approach to estimating the heat flow distribution in Mexico","authors":"Heng Zhang , Yiheng Cai , Shinan Lang , Xiangbin Cui , Xiaoqing Zhang","doi":"10.1016/j.tecto.2025.231005","DOIUrl":"10.1016/j.tecto.2025.231005","url":null,"abstract":"<div><div>Heat flow is an important parameter reflecting the thermal structure of the Earth's interior and a key indicator of geothermal resource potential. Mexico lies at the tectonic intersection of the Pacific Ring of Fire and holds potential for geothermal energy exploration. Existing studies primarily use traditional interpolation methods, magnetic data inversion, or similarity methods for regional heat flow estimation. However, these approaches are limited by sparse and unevenly distributed data as well as crustal complexities, resulting in difficulties in capturing detailed spatial heterogeneity of heat flow. To accurately predict the surface heat flow distribution in the Mexico region, this study proposes an integrated framework combining two-stage feature selection and a cascaded machine learning model. First, a compact and informative feature set was constructed using a two-stage selection process that integrates correlation analysis and modeling-based evaluation. The selected features include lithosphere-asthenosphere boundary (LAB) depth, gravity mean curvature, 230 km shear wave velocity, 300 km shear wave velocity, topography (elevation), distance to ridge, and distance to volcano. Subsequently, an initial heat flow prediction was generated using a Random Forest (RF) model based on this feature set. Finally, both the initial prediction and the selected features were jointly input into an Extreme Gradient Boosting (XGBoost) model for further learning, resulting in a more accurate heat flow estimation. A 0.5° × 0.5° resolution heat flow distribution map of Mexico was generated based on key geological features. The map reveals that Mexico's heat flow exhibits a spatial distribution characterized by high values in the west and low values in the east, with extreme values located along volcanic belts. High heat flow concentrates in central-southern Mexico and the Gulf of California coast; low values occur along the south Pacific coast, southern Gulf of Mexico, and Yucatán Peninsula.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"919 ","pages":"Article 231005"},"PeriodicalIF":2.6,"publicationDate":"2026-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145537506","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}

引用次数: 0

Control of crustal melt migration on geothermal system development in the Daggyai area, southern Tibet: Insights from 3D magnetotelluric imaging

IF 2.6 3区地球科学

Tectonophysics Pub Date : 2026-01-12 Epub Date: 2025-12-01 DOI: 10.1016/j.tecto.2025.231032

Menglong Liao , Yuanzhi Cheng , Bo Han , Zhonghe Pang

{"title":"Control of crustal melt migration on geothermal system development in the Daggyai area, southern Tibet: Insights from 3D magnetotelluric imaging","authors":"Menglong Liao , Yuanzhi Cheng , Bo Han , Zhonghe Pang","doi":"10.1016/j.tecto.2025.231032","DOIUrl":"10.1016/j.tecto.2025.231032","url":null,"abstract":"<div><div>The Daggyai geothermal field in the southern Tibetan Plateau is characterized by abundant boiling springs and geysers, with thermal waters exhibiting significant enrichment in trace elements (As, B, and Li). To investigate the formation mechanisms and geothermal potential of this hydrothermal system, we conducted a magnetotelluric (MT) survey along a north–south profile across the field and developed a 3D resistivity model using ModEM. Integration of resistivity modeling, geochemical data, and geological observations reveals the following characteristics: (1) A shallow low-resistivity body functioning as the primary geothermal reservoir; (2) A low-resistivity body at intermediate depths (4–10 km) indicating either a fluid-dominated high-temperature rock mass or a zone containing a high aqueous phase with limited partial melt; (3) A pronounced low-resistivity body at depths of 10–18 km representing the principal heat source, interpreted as a partially molten rock body with melt fractions of 5.72–11.15%; (4) An additional deep low-resistivity body providing evidence of significant crustal melting, with estimated melt fractions of 8.13–14.61%. The resistivity structure demonstrates clear electrical connectivity between the deep crustal melting zone and the principal heat source region. We propose that the ongoing India–Eurasia continental collision facilitates the upward migration of crustal melts, which subsequently accumulate beneath the Daggyai field, sustaining its high-temperature hydrothermal system. This mechanism suggests that other high-temperature geothermal systems in southern Tibet characterized by shallow partial melt heat sources may share similar patterns of melt migration and accumulation, providing crucial insights into the evolution of geothermal systems across the southern Tibetan Plateau.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"919 ","pages":"Article 231032"},"PeriodicalIF":2.6,"publicationDate":"2026-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145658140","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}

引用次数: 0

Differential lithospheric deformation in central Mongolia revealed by seismic radial anisotropy 地震径向各向异性揭示的蒙古中部岩石圈差异变形

IF 2.6 3区地球科学

Tectonophysics Pub Date : 2026-01-12 Epub Date: 2025-11-17 DOI: 10.1016/j.tecto.2025.231003

Mengfan Jiang , Xuewei Bao

{"title":"Differential lithospheric deformation in central Mongolia revealed by seismic radial anisotropy","authors":"Mengfan Jiang , Xuewei Bao","doi":"10.1016/j.tecto.2025.231003","DOIUrl":"10.1016/j.tecto.2025.231003","url":null,"abstract":"<div><div>Central Mongolia, recording Phanerozoic accretion and continental growth, has experienced varying intracontinental deformation since the Cenozoic. These include dome-like uplift of the Hangai Dome accompanied by diffuse normal faults with low seismicity, but shortening at its peripheries marked by significant strike-slip/thrust motions with intensive seismicity. Nevertheless, how this complex intracontinental deformation is accommodated by deep strain partitioning remains elusive. We present a new high-resolution 3-D radially anisotropic shear-wave velocity model of the lithosphere beneath central Mongolia using ambient noise tomography with data mainly from two dense seismic arrays. Specifically, in the mid-lower crust, the Hangai Dome shows weak anisotropy, indicating relatively weak deformation due to its cratonic basement, whereas the dome's peripheries feature strong positive radial anisotropy, suggesting intensive sub-horizontal ductile shear deformation. Additionally, we demonstrate the presence of the uppermost-mantle partial melting and further constrain the melt fraction and shape by radial anisotropy, which suggest a northeastward decrease in lithospheric strain across the Hangai Dome and its peripheries, likely due to the propagation and subsequent attenuation of NE-directed compressive stress from the India-Asia collision through central Mongolia. Considering the heterogenous lithospheric rheology, our findings provide novel insights into the lithospheric strain partitioning below the complex intracontinental deformation field in central Mongolia.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"919 ","pages":"Article 231003"},"PeriodicalIF":2.6,"publicationDate":"2026-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145554204","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}

引用次数: 0