Tectonophysics最新文献

{"title":"Timing of the switchover from thrusting to normal faulting in the Cretan nappe pile, Greece","authors":"Uwe Ring ,&nbsp;Charalampos Fassoulas ,&nbsp;I. Tonguç Uysal ,&nbsp;Johannes Glodny ,&nbsp;Kui Tong ,&nbsp;Andrew Todd","doi":"10.1016/j.tecto.2025.230652","DOIUrl":"10.1016/j.tecto.2025.230652","url":null,"abstract":"<div><div>Contractional faults and shear zones are often reactivated by normal faulting and the timing of this kinematic switchover is critical for better understanding orogeny, especially the formation and exhumation of high-pressure rocks. We report two fault gouge ages of ∼30 and ∼25 Ma from the contact zone between the high-pressure Phyllite-Quartzite Unit and the overlying, weakly metamorphosed Tripolitza Nappe in central Crete, southern Aegean Sea, Greece. This contact, the Damasta shear zone, is commonly regarded as a segment of the Cretan Detachment, the age of which is not well known. The dated gouge dominantly shows early top-to-the-S kinematic indicators, with some indication of a top-to-the-N reactivation. Illite/muscovite grain-size fractions of 0.5–0.2 μm and 0.2–0.1 μm yielded, within error, similar K<img>Ar ages of ∼30 Ma. These internally consistent ages can be interpreted as the timing of a first faulting event, which we interpret to be associated with the dominant set of top-to-the-S kinematic indicators. Three K<img>Ar ages of ∼25 Ma were obtained from two separate &lt;0.1 μm and a single &lt;0.2 μm grain-size fraction. This robust age of the finest grain-size fractions reflects the final faulting increment, considered to date top-to-the N normal shearing. Because the ∼25 Ma age overlaps with high-pressure metamorphism and subsequent rapid exhumation of the Phyllite-Quartzite Unit, we regard the age to be related to the Cretan Detachment in central Crete. Published data show that the upper parts of the Phyllite-Quartzite Unit started to be underthrust to the north between 36 and 29 Ma. Therefore, we relate the fault gouge ages of ∼30 Ma to this underthrusting event. We conclude that the switchover from contractional to normal faulting on the Cretan Detachment occurred at about 25 Ma.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"899 ","pages":"Article 230652"},"PeriodicalIF":2.7,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143204527","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":"Crustal geoelectric structure of the Indian plate at the western extremity of the Bundelkhand craton and Sharda Depression in the Ganga Basin","authors":"A. Manglik,&nbsp;M. Suresh,&nbsp;N.N. Chakravarthi,&nbsp;G. Pavankumar","doi":"10.1016/j.tecto.2025.230653","DOIUrl":"10.1016/j.tecto.2025.230653","url":null,"abstract":"<div><div>The latest episode in the geodynamic evolution of the Ganga Basin invokes continent-continent collision, Himalayan mountain building, and flexure of the Indian plate, which resulted in deposition of thick alluvial sediments in the basin masking the geological heterogeneities of the Indian plate. In recent years, a series of magnetotelluric (MT) studies in the central Ganga Basin have brought out information about its basement and crustal structure. In the present study, we have covered the region between Gwalior and Tanakpur falling at the western extremity of the Bundelkhand craton (BKC) in south and the super-deep Sharda Depression in north (at the Himalayan foothills) by a 330 km long profile to delineate the crustal structure of the region. The geoelectric model of the crustal structure derived from 2-D inversion of broadband MT data reveals the presence of the BKC underneath the alluvial sediments as a resistive northward dipping block in this region also, implying that the BKC extends northward of its presently known boundary shown in the geological map of the region. This cratonic block is buried beneath about 5 km thick moderately resistive rocks of the Vindhyan Supergroup. The results also reveal the presence of an upper-thick Proterozoic rift basin with its deepest part more than 30 km thick within the Sharda Depression, and two lithospheric mantle conductors in the central sector of the profile indicating the possibility of the presence of a significant conductive anomaly at deep lithospheric level. The top conducting layer in the model consisting of the Shiwaliks and Recent alluvium deposited in the flexural environment gradually thickens northward and attains a thickness of about 5 km at the foothills. The results reveal that the crustal structure of this part of the Ganga Basin is highly heterogeneous across the basin.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"899 ","pages":"Article 230653"},"PeriodicalIF":2.7,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143349238","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":"Moho depth variations of Zealandia from gravity data inversion and implications for continental breakup","authors":"Xuliang Feng ,&nbsp;Xiangyu Zong ,&nbsp;Xiaodong Wang ,&nbsp;Liu Yang ,&nbsp;Jiayue Ma","doi":"10.1016/j.tecto.2025.230643","DOIUrl":"10.1016/j.tecto.2025.230643","url":null,"abstract":"<div><div>The thickness of the Earth's crust, along with the relief and characteristics of the Moho discontinuity, serves as a critical constraint for numerous geoscientific investigations. By removing the gravitational effects of topography, seawater, sediment, and thermo-gravitational effects from the lithosphere in Zealandia and its adjacent regions, we isolate the gravity anomaly associated with the Moho discontinuity to compute its depth. We determined the intercept of the linear relationship between Moho depth derived from the global crust model CRUST1.0 and corresponding Moho gravity anomalies as an estimate for mean Moho depth. A laterally variable crust-mantle density contrast was initially obtained using Bouguer plate formula based on both CRUST1.0-derived Moho depths and observed gravity anomalies; this was subsequently rescaled utilizing the slope of linear regression between actual Moho gravity anomalies and fitted gravity anomalies computed from CRUST1.0-derived Moho depths alongside our initial density contrast estimates. The results calculated via Parker-Oldenburg formula indicate that Zealandia's Moho depth primarily ranges from 8 to 28 km, while crustal thickness varies between 4 and 26 km. These values are significantly greater than those typical of oceanic crust but remain less than those characteristic of continental crust. Within our study area, identified ocean basins show a decreasing trend in crustal thickness relative to both oceanic crust age and increasing water depth. When considering only areas where crustal thickness is less than 16 km on scatter plots, Middleton Basin and Lord Howe Basin display substantially greater thicknesses compared to New Caledonia Basin and Fairway Basin. This observation suggests that if these four basins possess oceanic crusts beneath them, then it is likely that the oceanic crust underlying Middleton and Lord Howe Basins predates that found beneath New Caledonia and Fairway Basins, implying that post-Zealandia separation from Gondwana involved rifting predominantly linked to subduction rollback of the Pacific Plate.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"898 ","pages":"Article 230643"},"PeriodicalIF":2.7,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143072476","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":"Seismicity, seismotectonics and historical earthquakes of the Northwestern Apennines, Italy: A reappraisal","authors":"E. Eva ,&nbsp;G. Molli ,&nbsp;F. Pettenati ,&nbsp;S. Solarino","doi":"10.1016/j.tecto.2025.230642","DOIUrl":"10.1016/j.tecto.2025.230642","url":null,"abstract":"<div><div>The inner NW Apennines includes the Lunigiana region, which has been shaken by several strong (M &gt; 6.0) earthquakes in the last millenium until the most recent 2013 Mw 5.1, Fivizzano earthquake. In this study we profit from more than 30 years of seismicity and an updated map of the faults to perform a seismotectonic analysis. In order to enlarge our study to the strongest events, we also compute the focal parameters of the 1834 and 1837 earthquakes applying the KF technique to macroseismic intensities. Our findings show that most of the seismicity in the study region is organized in clusters. The southern cluster is oriented nearly <em>E</em>-W and marks the border between the Lunigiana and Garfagnana grabens, NW of the Alpi Apuane. The northern cluster is less limited in size and number of events, and this masks the predominant apenninic NW-NNW orientation. NE of the Lunigiana graben, seismic events align along an apenninic direction as well. On the external side, earthquakes are almost perpendicular to the chain in an NEE-SWW orientation. Cross sections show the existence of three domains along the NE-SW direction. While the external and internal domains are well defined, the domain in between may represent the area in which switching from shortening to extension is ongoing. The processes occurring in this domain entail energies that are at times unleashed as considerable earthquakes, including the notable seismic event of 1834.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"898 ","pages":"Article 230642"},"PeriodicalIF":2.7,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143072477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The complex 4D multi-segmented rupture of the 2014 Mw 6.2 Northern Nagano Earthquake revealed by high-precision aftershock locations","authors":"Titouan Muzellec ,&nbsp;Grazia De Landro ,&nbsp;Giovanni Camanni ,&nbsp;Guido Maria Adinolfi ,&nbsp;Aldo Zollo","doi":"10.1016/j.tecto.2025.230641","DOIUrl":"10.1016/j.tecto.2025.230641","url":null,"abstract":"<div><div>Enhanced earthquake sequence seismic catalogs have the potential to reveal fault surface complexities at depth (e.g., segmentation, bends). Past analyses were generally restricted to 2D analysis considering faults discontinuous along their strike and do not include segment temporal evolution. Our work provides a comprehensive methodology, for reconstructing the 3D fine-scale (few kilometers length) geometry of a segmented fault surface and to characterize the triggering of the segments during an earthquake mainshock-aftershock sequence <em>We</em> analyzed the 2014 Northern Nagano (Japan) (M_w 6.2) earthquake sequence using high-resolution seismic catalogs. We automatically detected and located about 2500 events between October and December 2014 with a magnitude range between –0.6 and 6.2. We refined the automatic picks, based on cross-correlation and hierarchical clustering, and we relocated the hypocenters with the double-difference technique in 3D velocity models optimized for the area. Moreover, we calculated the composite focal mechanisms of the main clusters, crucial to constrain the kinematics and the 3D geometry of the fault segments, and rupture directivity that we interpreted jointly with the seismicity and the fault slip. We find that a segmented fault surface comprising, at least, 9 distinct segments, ruptured during 3 successive activation phases. The different segments exhibit a different rupture mechanism based on their spatial and temporal occurrence, influencing seismicity evolution and rupture length. Our method, based on deep analysis of relocated aftershocks sequence, can be used in other study cases for the fault surface reconstruction to better understand the complexity of the earthquake rupture.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"898 ","pages":"Article 230641"},"PeriodicalIF":2.7,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143072732","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of large-scale structures on fracture network connectivity: Insights into the Vaca Muerta unconventional play, Neuquén basin, Argentina","authors":"Clara Correa-Luna ,&nbsp;Daniel L. Yagupsky ,&nbsp;Jeremías Likerman ,&nbsp;Hernán Barcelona","doi":"10.1016/j.tecto.2025.230640","DOIUrl":"10.1016/j.tecto.2025.230640","url":null,"abstract":"<div><div>Understanding natural fracture networks in rock masses is crucial due to their significant impact on mechanical behavior and fluid flow dynamics. Discrete Fracture Network (DFN) models provide a robust framework for representing these networks and assessing their role as pathways for fluid migration. They also allow the study of the relationship between fracturing and large-scale geological features such as faults, lineaments, and fracture corridors, all of which influence fracture-network connectivity. This last feature is critical for defining the geometry of the stimulated rock volume in low-permeability shale oil reservoirs and predicting well interference problems. In this study, 2D DFN models were developed using a dataset that integrates field measurements of fractures with interpretations derived from a georeferenced orthomosaic generated through an Unmanned Aerial Vehicle (UAV) survey. The Mallín de los Caballos site, where the Los Catutos Member within the Vaca Muerta Formation outcrops, was selected as the natural prototype. This carbonate-dominated member provides notable exposures, enabling a detailed survey. Lateral connectivity analyses of the constructed models reveal a poorly connected background system. However, when larger-scale ENE-WSW-oriented structures are introduced, connectivity and resulting anisotropy of permeability increase substantially, transforming the spatial distribution and local fluid flow potential. At the reservoir scale, these structures correspond to subvertical strike-slip faults identified in 3D seismic data of the Neuquén Embayment, though their full characterization is limited by seismic resolution. This work proposes improved parametrization of these structural lineaments identified in the outcropping upper section of the Tordillo Formation. These findings highlight the importance of integrating geological data of various scales to comprehensively understand the behavior of fluid flow in unconventional reservoirs such as the Vaca Muerta Formation.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"898 ","pages":"Article 230640"},"PeriodicalIF":2.7,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143072478","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":"Heat flow in an active plate margin: New Zealand's crustal thermal regime from borehole temperatures and numerical modelling","authors":"Alison Kirkby ,&nbsp;Rob Funnell ,&nbsp;Phil Scadden ,&nbsp;Anya Seward ,&nbsp;Conny Tschritter ,&nbsp;Katie Jones","doi":"10.1016/j.tecto.2025.230638","DOIUrl":"10.1016/j.tecto.2025.230638","url":null,"abstract":"&lt;div&gt;&lt;div&gt;Geothermal heat provides a low-carbon energy source, which can be used directly or to produce electricity. It is an important part of New Zealand's energy mix, but to date geothermal use in New Zealand has been focused in known hot regions, particularly the Taupō Volcanic Zone (TVZ), above the subducting Pacific Plate. This study examines the complexity of New Zealand's heat flow and crustal temperature distribution, using borehole temperature measurements and conductive heat flow modelling, with a focus outside the TVZ. The modelling includes the transient heat flow effects of exhumation, basin subsidence and changes in crustal thickness, allowing gaps between sparse direct subsurface temperature measurements to be filled. Variations in New Zealand's heat flow largely reflect its position on a major plate boundary. The forearc region of the Hikurangi Subduction Margin has broadly low heat flow (30–50 mWm&lt;sup&gt;−2&lt;/sup&gt;), associated with the down-going Pacific Plate, consistent with evidence from geophysical models and fluid chemistry. Heat flow is elevated in the Coromandel Volcanic Zone (100–140 mWm&lt;sup&gt;−2&lt;/sup&gt;), north of the TVZ, which may be associated with volcanism from 18 to 4 Ma. High heat flow in Northland (100–220 mWm&lt;sup&gt;−2&lt;/sup&gt;) is associated with more recent igneous activity. High heat flow along the Alpine Fault collisional plate boundary (150–250 mWm&lt;sup&gt;−2&lt;/sup&gt;) is largely a result of rock advection (exhumation), which has been occurring at up to 6 mm yr&lt;sup&gt;−1&lt;/sup&gt; over the last 2 Ma. These results demonstrate the importance of including transient processes in modelling heat flow in active areas.&lt;/div&gt;&lt;/div&gt;&lt;div&gt;&lt;h3&gt;Plain language summary&lt;/h3&gt;&lt;div&gt;Understanding the temperatures in the upper 5–10 km of the Earth is important for many reasons. These include a growing drive to expand the use of geothermal energy, or heat energy in the earth, as a low-carbon way of producing electricity or direct use of heat for processes that would otherwise use electricity or fossil fuels. Knowing the temperature distribution is also important in understanding processes such as earthquake rupture. Subsurface temperatures have been measured in boreholes in some locations, but there are also large areas without any measurements. This paper uses our knowledge of geological processes occurring in New Zealand to predict underground temperatures between measurement locations. The underground temperatures of the Earth generally increase with depth, but the rate of increase varies greatly in different places. This variation is largely due to New Zealand's location on the boundary between two tectonic plates, the Pacific and Australian Plate. In the North Island, the Pacific Plate is subducting beneath the Australian Plate. This causes low crustal temperatures along the southeastern margin of the North Island but high temperatures in the central North Island (Taupō Volcanic Zone). In the South Island, the Pacific and Australian Plates are collid","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"899 ","pages":"Article 230638"},"PeriodicalIF":2.7,"publicationDate":"2025-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143204528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mantle influence on crustal discontinuity revealed by He isotopes and resistivity in the East African Rift System","authors":"Zhijie Jia ,&nbsp;Jianbing Peng ,&nbsp;Pietro Sternai ,&nbsp;Quanzhong Lu ,&nbsp;Weiliang Huang ,&nbsp;Lingqiang Zhao ,&nbsp;Jiewei Zhan ,&nbsp;Qiang Xu","doi":"10.1016/j.tecto.2025.230637","DOIUrl":"10.1016/j.tecto.2025.230637","url":null,"abstract":"<div><div>As one of the most renowned continental rifts on Earth, the East African Rift System (EARS) is characterized by intense rifting and active volcanic activity, creating a favorable geological setting for the development of crustal discontinuity and ground fissures. In this study, crustal discontinuities are defined as regions of weakness resulting from fault activity and crust-mantle interaction. This study investigates the crustal discontinuity in the Central Kenyan Rift (CKR) through a multidisciplinary approach that includes mapping, trenching, gas geochemical testing, magnetotellurics, surface deformation analysis, correlation analysis and geodynamic modelling. A total of 83 ground fissures were identified, mostly distributed along the eastern side of the rift zone and are primarily characterized by opening and uplifting of the flank. Helium isotope values (R_C/R_A) of gases escaping the fissures were generally greater than 0.2. Compared to the volcanic gases, those from the fissure is more indicative of mantle origin. Fissured areas are located above two crustal discontinuities identified by low-resistivity zones. These discontinuities (weakness) are located at depths of approximately 1 km and 5–20 km, with thicknesses of 200–600 m and 2–14 km, respectively. In the areas with deep discontinuities, the thicknesses of the anomaly zone increase with the R_C/R_A values, while the opposite is observed in the areas with shallow discontinuities. The spatial distribution of fissures suggests the westward-dipping mantle plume in the EARS is the main cause of the crustal discontinuity. This research not only enhances the understanding of the crust-mantle interaction in EARS but also aids in evaluating the fracture network in the crust.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"898 ","pages":"Article 230637"},"PeriodicalIF":2.7,"publicationDate":"2025-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143072469","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":"Locating active faults in the Cusco Valley using magnetotelluric and radon gas data","authors":"Briant García ,&nbsp;César J. Guevara-Pillaca ,&nbsp;Martyn Unsworth ,&nbsp;Patrizia Pereyra ,&nbsp;Carlos Benavente ,&nbsp;Andy Combey ,&nbsp;Daniel Palacios ,&nbsp;Anderson Palomino ,&nbsp;Rafael Ponce ,&nbsp;Lorena Rosell ,&nbsp;Alonso Muñoz","doi":"10.1016/j.tecto.2025.230639","DOIUrl":"10.1016/j.tecto.2025.230639","url":null,"abstract":"<div><div>This study presents a novel approach to identifying and characterizing active faults in urban areas, using an example from the city of Cusco in Peru, by combining magnetotelluric (MT) exploration and radon gas monitoring. The research aims to improve understanding of the active faults in the Cusco Valley by using the MT method to provide subsurface electrical resistivity data, enabling the mapping of fault structures and determination of fault properties. A 2-D inversion of the MT data resulted in resistivity models that revealed critical information about fault geometry, such as dip and depth. Radon gas measurements complement the MT data by being able to distinguish between active and inactive faults. This is because active faults can exhibit higher permeability due to ongoing tectonic activity. This increased permeability facilitates the migration of radon from deeper rock formations to the surface, leading to detectable anomalies. Active faults are particularly significant as their continued deformation enhances permeability, making radon anomalies a valuable indicator for locating these structures. A clear correlation was found between elevated radon concentrations (&gt;5.9 kBq m⁻³) and the locations of faults identified through the MT resistivity model, and additional gas sample analyses ruled out the possibility that these anomalies were caused by lithological variations. This integrated approach holds significant potential for detecting active faults in urban areas such as Cusco. In these locations faults such as the Cusco and Alto Qosqo faults may be obscured by construction. The findings uncovered previously unmapped fault lineaments and advanced the understanding of fault kinematics in Cusco, emphasizing the importance of combining MT and radon monitoring for earthquake hazard assessment in urban environments.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"898 ","pages":"Article 230639"},"PeriodicalIF":2.7,"publicationDate":"2025-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143072466","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":"Mid-crustal low-velocity zones beneath Southeastern Coastal China revealed by multimodal ambient noise tomography: Insights into Mesozoic magmatic activities","authors":"Haiyan Li ,&nbsp;Juqing Chen ,&nbsp;Zhengbo Li ,&nbsp;Xiaofei Chen ,&nbsp;Huiteng Cai ,&nbsp;Xuping Feng ,&nbsp;Gongheng Zhang ,&nbsp;Zhen Jin","doi":"10.1016/j.tecto.2025.230636","DOIUrl":"10.1016/j.tecto.2025.230636","url":null,"abstract":"<div><div>Southeastern Coastal China, located at the southeastern margin of the Eurasian continent, is an essential part of the South China Block. It is characterized by extensive Mesozoic magmatism and polymetallic mineralization. To explore the potential impact of Mesozoic magmatic events on the crust, we analyzed inter-station cross-correlation functions from 878 seismic stations. Utilizing the recently developed frequency-Bessel transform method, we extracted multimodal Rayleigh wave dispersion curves and constructed an updated 3D shear-wave velocity model. Our model reveals prominent and widespread mid-crustal low-velocity zones (MCLVZs) across the study area, likely attributable to the alpha-beta quartz phase transition. Additionally, a strong correlation is observed between MCLVZs characteristics and Jurassic-Cretaceous magmatic activities, with a southwest-to-northeast variation in MCLVZs continuity and intensity, reflecting the spatiotemporal migration of magmatism. These findings offer new constraints on the tectonic evolution of Southeastern Coastal China.</div></div>","PeriodicalId":22257,"journal":{"name":"Tectonophysics","volume":"898 ","pages":"Article 230636"},"PeriodicalIF":2.7,"publicationDate":"2025-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143072467","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}