Tectonics最新文献_第7页

Surface Rupturing Earthquakes of the Greater Caucasus Frontal Thrusts, Azerbaijan 阿塞拜疆大高加索正面隆起的地表破裂地震

IF 4.2 1区地球科学

Tectonics Pub Date : 2024-03-09 DOI: 10.1029/2023tc007758

Ian Pierce, Ibrahim Guliyev, Gurban Yetirmishli, Rauf Muradov, Sabina Kazimova, Rashid Javanshir, Gregory P. De Pascale, Ben Johnson, Neill Marshall, Richard Walker, Paul Wordsworth

{"title":"Surface Rupturing Earthquakes of the Greater Caucasus Frontal Thrusts, Azerbaijan","authors":"Ian Pierce, Ibrahim Guliyev, Gurban Yetirmishli, Rauf Muradov, Sabina Kazimova, Rashid Javanshir, Gregory P. De Pascale, Ben Johnson, Neill Marshall, Richard Walker, Paul Wordsworth","doi":"10.1029/2023tc007758","DOIUrl":"https://doi.org/10.1029/2023tc007758","url":null,"abstract":"Here we present the results of the first paleoseismic study of the Kura fold-thrust belt in Azerbaijan based on field mapping, fault trenching, and Quaternary dating. Convergence at rates of ∼10 mm/yr between the Arabian and Eurasian Plates is largely accommodated by the Kura fold-thrust belt which stretches between central Azerbaijan and Georgia along the southern front of the Greater Caucasus (45–48°E). Although destructive historic earthquakes are known here, little is known about the active faults responsible for these earthquakes. A paleoseismic trench was excavated across a 2-m-high fault scarp near Agsu revealing evidence of two surface rupturing earthquakes. Radiocarbon dating of the faulted sediments limits the earthquake timing to AD 1713–1895 and AD 1872–2003. Allowing for uncertainties in dating, the two events likely correspond to historical destructive M ∼ 7 earthquakes near Shamakhi, Azerbaijan in AD 1668 and 1902. A second trench 60 km west of Agsu was excavated near Goychay also revealing evidence of at least one event that occurred 334–118 BC. Holocene shortening and dip-slip rates for the Kura fold-thrust belt are ∼8.0 and 8.5 mm/yr, respectively, based on an uplifted strath terrace west of Agsu. The only known historical devastating (M > ∼7) earthquakes in the Kura region, west of Shamakhi, occurred in 1139 and possibly 1668. The lack of reported historical ruptures from the past 4–8 centuries in the Kura, in contrast with the numerous recorded destructive earthquakes in Shamakhi, suggests that the Kura fold-thrust belt may have accumulated sufficient strain to produce a M > 7.7 earthquake.","PeriodicalId":22351,"journal":{"name":"Tectonics","volume":"79 1","pages":""},"PeriodicalIF":4.2,"publicationDate":"2024-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140097472","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Diverse Structural Styles of the Northeastern Tethyan Himalaya in Southern Tibet Reveal the Early Collisional Tectonics of India and Asia 藏南喜马拉雅山东北部多样的构造样式揭示了印度和亚洲早期的碰撞构造运动

IF 4.2 1区地球科学

Tectonics Pub Date : 2024-03-07 DOI: 10.1029/2023tc007954

Yu Tang, Xiao Liang, Genhou Wang, Dian Li, Zhanhui Qing, Yipeng Feng, Wei Zhang, Ning Han, Yang Tian, Zhuosheng Wang

{"title":"Diverse Structural Styles of the Northeastern Tethyan Himalaya in Southern Tibet Reveal the Early Collisional Tectonics of India and Asia","authors":"Yu Tang, Xiao Liang, Genhou Wang, Dian Li, Zhanhui Qing, Yipeng Feng, Wei Zhang, Ning Han, Yang Tian, Zhuosheng Wang","doi":"10.1029/2023tc007954","DOIUrl":"https://doi.org/10.1029/2023tc007954","url":null,"abstract":"The poor understanding of the structural history of the Late Triassic flysch in the northeastern Tethyan Himalaya has caused many disputes regarding India-Asia collisional tectonics. Here, we conducted an integrated study including tectonostratigraphic analysis, structural analysis, and zircon U‒Pb and muscovite 40Ar/39Ar dating to unravel the structural evolution of the Late Triassic flysch. Field geological mapping revealed that the flysch can be subdivided into three structural units, including the Gyaca mélange, Qiongjie-Dengmu shear zone and Langjiexue fold-thrust belt. The three units all contain voluminous siliciclastic rocks deposited in an abyssal submarine fan environment at the Indian passive continental margin. The Gyaca mélange shows a two-stage deformation process that generated a collisional mélange resulting from the subduction of the Indian passive continental margin. 40Ar/39Ar dating of top-to-the-south shear bands and block-in-matrix structure indicate that the India-Asia collision happened no later than the Selandian (ca. 60 Ma). The divergent imbricated thrusting and folding of the Gyaca mélange and Langjiexue fold-thrust belt formed a positive flower structure. The zircon U‒Pb and 40Ar/39Ar dating of syntectonic dikes and sericite flakes within the Gyaca mélange yield ages of ca. 56–55 Ma for the genesis of the divergent structures. Moreover, the Qiongjie-Dengmu dextral shear zone yields a sericite 40Ar/39Ar age of ca. 35 Ma and thus indicates a transient strike-slip stress regime. Generally, the early India-Asia collision tectonics in the northeastern Tethyan Himalaya showed episodic evolution with changing structural styles from mélange formation to imbricate fold-thrust belt development and finally strike-slip shear generation.","PeriodicalId":22351,"journal":{"name":"Tectonics","volume":"56 1","pages":""},"PeriodicalIF":4.2,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140071957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Stress Patterns and Crustal Anisotropy in the Eastern Alps: Insights From Seismological and Geological Observations 东阿尔卑斯山的应力模式和地壳各向异性：从地震学和地质学观测中获得的启示

IF 4.2 1区地球科学

Tectonics Pub Date : 2024-03-06 DOI: 10.1029/2023tc008033

F. Villani, A. Antonioli, M. Pastori, P. Baccheschi, M. G. Ciaccio

{"title":"Stress Patterns and Crustal Anisotropy in the Eastern Alps: Insights From Seismological and Geological Observations","authors":"F. Villani, A. Antonioli, M. Pastori, P. Baccheschi, M. G. Ciaccio","doi":"10.1029/2023tc008033","DOIUrl":"https://doi.org/10.1029/2023tc008033","url":null,"abstract":"In the Eastern Alps, the indentation of the Adriatic promontory since the Cenozoic affected the kinematics of separate crustal domains bounded by faults that accommodate lateral extrusion processes and differential shortening. Deciphering the pattern of crustal stresses in the orogen interior is challenging, due to the lack of in situ stress measurements at crustal depths. We define stress regimes and the orientations of the most-compressive horizontal stress (SHmax) by integrating published results with new data, including stress analysis from fault plane solutions, estimation of crustal anisotropy through the shear wave splitting analysis, paleostress determination from fault slip data, and computation of cumulative seismic displacements. The retrieved regional SHmax are generally consistent with N-S convergence. In the northern part of the study area, current stress orientations are almost parallel to paleo-SHmax, suggesting a rather uniform compressional regime since the late Cenozoic. Conversely, sharp deflections and divergence with paleo-SHmax appear at the western border of the Adriatic promontory across major transpressive and extensional shear zones and in the Southalpine domain, indicating a change in tectonically induced second-order stresses. A current strike-slip regime with subordinate orogen-parallel seismic displacements affects a belt to north of the Periadriatic Lineament and NE-extension characterizes the Ortles-Engandine region. Seismic anisotropy locally exhibits fault-parallel fast axes (Brenner-Giudicarie fault-systems, Dinaric and Southalpine thrusts), whereas stress-induced anisotropy parallel to SHmax characterizes the southern part of the orogen. Cumulative seismic displacements are small compared to geodetic ones, and unravel partitioning of deformation into second-order transpressive and extensional belts in response to indentation.","PeriodicalId":22351,"journal":{"name":"Tectonics","volume":"27 1","pages":""},"PeriodicalIF":4.2,"publicationDate":"2024-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140056451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 Complex Interplay Between Pluton Emplacement, Tectonic Deformation, and Plate Kinematics in the Cretaceous Sierra Nevada Magmatic Arc, California 加利福尼亚州白垩纪内华达山脉岩浆弧区的岩浆置换、构造变形和板块运动学之间的复杂相互作用

IF 4.2 1区地球科学

Tectonics Pub Date : 2024-03-04 DOI: 10.1029/2023tc007822

Filip Tomek, Jiří Žák, Kryštof Verner, Josef Ježek, Scott R. Paterson

{"title":"A Complex Interplay Between Pluton Emplacement, Tectonic Deformation, and Plate Kinematics in the Cretaceous Sierra Nevada Magmatic Arc, California","authors":"Filip Tomek, Jiří Žák, Kryštof Verner, Josef Ježek, Scott R. Paterson","doi":"10.1029/2023tc007822","DOIUrl":"https://doi.org/10.1029/2023tc007822","url":null,"abstract":"The relation of plate kinematics to the structural record of arc plutons and their host rocks is complex and still not fully understood. We address this issue through a combination of field mapping, structural analysis, anisotropy of magnetic susceptibility analysis, and fabric modeling in the Late Cretaceous Tuolumne Intrusive Complex, Sierra Nevada, California. A pattern of anti-clockwise rotation from ∼NNW–SSE to WNW–ESE steep foliations and change in fabric ellipsoid shape from oblate to prolate was revealed in successively emplaced Kuna Crest (∼95–92 Ma), Half Dome (∼92–89 Ma), and Cathedral Peak (∼89–84 Ma) granodiorites. The numerical model indicates that the Kuna Crest was emplaced in a transpressional setting with an angle of convergence α = 60–40°, whereas the Half Dome and Cathedral Peak required simultaneous vertical constriction overprinted by transpression with α = 35–15°. This transition, which occurred at ∼92 Ma, is accompanied by a shallowing of the lineation plunge observed also in other ∼88–84 Ma central Sierra Nevada plutons. Provided that the Cretaceous Sierra Nevada arc was constructed during overall dextral transpression, these transitions reflect significant changes in kinematics, where ∼107–92 Ma plutons were emplaced during pure shear-dominated transpression, which was followed by a transition to wrench-dominated transpression recorded in ∼92–84 Ma plutons. Such a transition in kinematics is explained as a result of progressively increasing obliquity of the relative convergence of the Farallon plate subducting beneath the North American continental margin, in agreement with most paleogeographic reconstructions.","PeriodicalId":22351,"journal":{"name":"Tectonics","volume":"2014 1","pages":""},"PeriodicalIF":4.2,"publicationDate":"2024-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140056334","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Multiple Exhumation Stages During the Cenozoic Evolution of the Northeast Tibetan Plateau 青藏高原东北部新生代演化过程中的多重侵蚀阶段

IF 4.2 1区地球科学

Tectonics Pub Date : 2024-03-04 DOI: 10.1029/2023tc007850

Xiuxi Wang, Massimiliano Zattin, Yu Yang, Jia Tao, Huiming Liu, Yanbo Zhang, Hong Wang, Bozhong Pang, Linbing Wang, Minxiao Ji

{"title":"Multiple Exhumation Stages During the Cenozoic Evolution of the Northeast Tibetan Plateau","authors":"Xiuxi Wang, Massimiliano Zattin, Yu Yang, Jia Tao, Huiming Liu, Yanbo Zhang, Hong Wang, Bozhong Pang, Linbing Wang, Minxiao Ji","doi":"10.1029/2023tc007850","DOIUrl":"https://doi.org/10.1029/2023tc007850","url":null,"abstract":"The Cenozoic growth history of the northeast (NE) Tibetan Plateau has been strongly debated in the past few years with three deformation models being proposed: progressive northeastward propagation, out-of-sequence deformation, and episodic deformation. Reconstruction of the long-term deformation and exhumation history of the different blocks can help elucidate the growth pattern and tectonic processes involved in the formation of the Plateau. Both the Qaidam and Jiuquan basins—the two largest basins of the NE Tibetan Plateau—contain continuous and well-exposed successions of synorogenic sediments that span the entire Cenozoic. We used apatite fission-track thermochronology, sedimentary facies, and structural and provenance analyses of these successions to determine the exhumation history of the Tibetan Plateau. Five distinct fast exhumation events were recognized and dated: 65–54, 43–39, 34–29, 24–21, and 16–15 Ma. Comparison with existing morphotectonic information enabled us to reconstruct a multiple-stage growth scenario for the NE Tibetan Plateau in the context of the surface uplift phases across the Himalayan-Tibetan orogen during the Cenozoic. Overall, our findings support the episodic deformation model and emphasizes that the current relief of the NE Tibetan Plateau is largely derived from these five of stage of exhumation.","PeriodicalId":22351,"journal":{"name":"Tectonics","volume":"1 1","pages":""},"PeriodicalIF":4.2,"publicationDate":"2024-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140056436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Tectonic Evolution of the Condrey Mountain Schist: An Intact Record of Late Jurassic to Early Cretaceous Franciscan Subduction and Underplating 康德雷山片岩的构造演化：侏罗纪晚期至白垩纪早期弗朗西斯坎俯冲和下伏的完整记录

IF 4.2 1区地球科学

Tectonics Pub Date : 2024-03-04 DOI: 10.1029/2023tc008115

C. M. Tewksbury-Christle, W. M. Behr, M. A. Helper, D. F. Stockli

{"title":"Tectonic Evolution of the Condrey Mountain Schist: An Intact Record of Late Jurassic to Early Cretaceous Franciscan Subduction and Underplating","authors":"C. M. Tewksbury-Christle, W. M. Behr, M. A. Helper, D. F. Stockli","doi":"10.1029/2023tc008115","DOIUrl":"https://doi.org/10.1029/2023tc008115","url":null,"abstract":"The Klamath Mountains in northern California and southern Oregon are thought to record 200+ m.y. of subduction and terrane accretion, whereas the outboard Franciscan Complex records ocean-continent subduction along the North American margin. Unraveling the Klamath Mountains' Late Jurassic history could help constrain this transition in subduction style. Key is the Mesozoic Condrey Mountain Schist (CMS), comprising, in part, a subduction complex that occupies a structural window through older, overlying central Klamath thrust sheets but with otherwise uncertain relationships to more outboard Klamath or Franciscan terranes. The CMS consists of two units (upper and lower), which could be correlated with (a) other Klamath terranes, (b) the Franciscan, or (c) neither based on regional structures and limited extant age data. Upper CMS protolith and metamorphic dates overlap with other Klamath terranes, but the lower CMS remains enigmatic. We used multiple geochronometers to constrain the timing of lower CMS deposition and metamorphism. Maximum depositional ages (MDAs) derived from detrital zircon geochronology of metasedimentary rocks are 153–135 Ma. Metamorphic ages from white mica K-Ar and Rb-Sr multi-mineral isochrons from intercalated and coherently deformed metamafic lenses are 133–116 Ma. Lower CMS MDAs (<153 Ma) predominantly postdate other Klamath terrane ages, but subduction metamorphism appears to start before the earliest coherent Franciscan underplating (ca. 123 Ma). The lower CMS thus occupies a spatial and temporal position between the Klamath Mountains and Franciscan and preserves a non-retrogressed record of the Franciscan Complex's early history (>123 Ma), otherwise only partially preserved in retrogressed Franciscan high grade blocks.","PeriodicalId":22351,"journal":{"name":"Tectonics","volume":"107 1","pages":""},"PeriodicalIF":4.2,"publicationDate":"2024-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140044810","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Tectonic Evolution of the Eastern Southern Alps (Italy): A Reappraisal From New Structural Data and Geochronological Constraints 意大利南阿尔卑斯山东部的构造演化：从新的构造数据和地质年代约束重新评估

IF 4.2 1区地球科学

Tectonics Pub Date : 2024-03-04 DOI: 10.1029/2023tc008013

Manuel Curzi, Giulio Viola, Costantino Zuccari, Luca Aldega, Andrea Billi, Roelant van der Lelij, Andrew Kylander-Clark, Gianluca Vignaroli

{"title":"Tectonic Evolution of the Eastern Southern Alps (Italy): A Reappraisal From New Structural Data and Geochronological Constraints","authors":"Manuel Curzi, Giulio Viola, Costantino Zuccari, Luca Aldega, Andrea Billi, Roelant van der Lelij, Andrew Kylander-Clark, Gianluca Vignaroli","doi":"10.1029/2023tc008013","DOIUrl":"https://doi.org/10.1029/2023tc008013","url":null,"abstract":"The Eastern Southern Alps fold-and-thrust belt (ESA) is part of the seismically active S-verging retro-wedge of the European Alps. Its temporal tectonic evolution during continental shortening has so far been constrained by few and low-resolution indirect time constraints. Aiming at better elucidating the ESA spatiotemporal evolution, we gathered new structural and geochronological data from two regional thrust systems: the innermost south verging Valsugana Thrust (VT) and the more external Belluno Thrust System (BTS). Field work allowed us to constrain the geometry and kinematics of those thrusts and related folds and informed our sampling strategy to carry out fault gouge K-Ar and tectonic carbonate U-Pb dating from representative samples structurally associated with the VT and BTS. Our results suggest that the VT was active already in the Late Cretaceous (between ∼78 and 76 Ma) in response to far-field stresses, with repeated reactivation continuing to the Late Miocene (∼6 Ma). The BTS recorded two distinct deformation events during the Oligocene (∼30 Ma) and at the Oligocene-Miocene boundary (∼23 Ma). The VT was active for ∼72 Myr and partly acted during out-of-sequence thrusting. Based on regional correlations, we propose that the ESA share a similar spatiotemporal deformation history with the central Southern Alps farther to the west. We suggest a conceptual regional tectonic model wherein multiple, broadly coeval deformation events occurred in the entire Southern Alps during their long-lived orogenic deformation in response to generally continuous NW-SE shortening.","PeriodicalId":22351,"journal":{"name":"Tectonics","volume":"30 1","pages":""},"PeriodicalIF":4.2,"publicationDate":"2024-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140044918","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

The Manantiales Basin, Southern Central Andes (∼32°S), Preserves a Record of Late Eocene–Miocene Episodic Growth of an East-Vergent Orogenic Wedge 安第斯山脉中南部（∼32°S）的马南蒂亚莱斯盆地保留了晚始新世-中新世东侵造山楔的偶发增长记录

IF 4.2 1区地球科学

Tectonics Pub Date : 2024-03-01 DOI: 10.1029/2023tc008100

Chance B. Ronemus, Caden J. Howlett, Peter G. DeCelles, Barbara Carrapa, Sarah W. M. George

{"title":"The Manantiales Basin, Southern Central Andes (∼32°S), Preserves a Record of Late Eocene–Miocene Episodic Growth of an East-Vergent Orogenic Wedge","authors":"Chance B. Ronemus, Caden J. Howlett, Peter G. DeCelles, Barbara Carrapa, Sarah W. M. George","doi":"10.1029/2023tc008100","DOIUrl":"https://doi.org/10.1029/2023tc008100","url":null,"abstract":"The Manantiales basin contains >4 km of nonmarine sedimentary strata that accumulated at 31.75–32.5°S during construction of the High Andes. We report field and analytical data from the underexplored northern portion of this basin. The basin contains upper Eocene–middle Miocene strata that accumulated in back-bulge or distal foredeep through inner-wedge-top depozones of the Andean foreland basin as it migrated through this region. A revised accumulation history for the basin-filling Río de los Patos and Chinches Formations supports a regional pattern of flexure in front of an east-vergent orogenic wedge. The former formation consists of eolian and localized fluviolacustrine deposits which accumulated between ca. 38 Ma and ≤34 Ma during thrust belt development in Chile. A subsequent ≤12 Myr hiatus may reflect passage of the flexural forebulge or cessation of subsidence during orogenic quiescence. The overlying Chinches Formation records a transition from the foredeep to wedge-top depozones. Foredeep deposits of east-flowing, meandering streams were incised prior to ca. 18 Ma, after which deposits of axial rivers, playas, and perennial lakes ponded in a depression behind orogenic topography to the east. After ca. 15 Ma, alluvial-fan deposits were syndepositionally deformed adjacent to growing thrust-belt structures along the western basin margin. Although the basin record supports a westward step in the locus of deformation during Early–Middle Miocene time, it conflicts with models involving west-vergence of the orogenic wedge. Rather, this pattern can be explained as out-of-sequence deformation alternating with wedge forward propagation, consistent with Coulomb wedge models incorporating syntectonic sedimentation.","PeriodicalId":22351,"journal":{"name":"Tectonics","volume":"22 1","pages":""},"PeriodicalIF":4.2,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140008436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Structural Interactions Between Deep Mesozoic Strike-Slip Faults and Shallow Cenozoic Contractional Folds in the Northern Tianshan Foreland Basin (NW China) 北天山前陆盆地（中国西北部）中生代深层走向滑动断层与新生代浅层收缩褶皱之间的构造相互作用

IF 4.2 1区地球科学

Tectonics Pub Date : 2024-02-22 DOI: 10.1029/2023tc007986

Zhenyu Peng, Xin Wang, Fabien Graveleau, Bruno C. Vendeville, Alan G. Nunns

{"title":"Structural Interactions Between Deep Mesozoic Strike-Slip Faults and Shallow Cenozoic Contractional Folds in the Northern Tianshan Foreland Basin (NW China)","authors":"Zhenyu Peng, Xin Wang, Fabien Graveleau, Bruno C. Vendeville, Alan G. Nunns","doi":"10.1029/2023tc007986","DOIUrl":"https://doi.org/10.1029/2023tc007986","url":null,"abstract":"In the rejuvenated mountain front, preexisting basement structures are often reactivated and interact with the subsequent thin-skinned deformation. How the deep structures affect the shallower ones is key to establishing the processes and mechanisms for the foreland fold-and-thrust system. We presented an exceptional case study on the structural inheritance between the deep Mesozoic strike-slip faults and the shallow Cenozoic contractional folds from the Northern Tianshan foreland basin, Northwest China, using high-resolution 2-D and 3-D seismic data. Based on the interpretation of seismic data and progressive restoration, our study illustrated the NW-trending Ai-Ka strike-slip faults controlled a dextral shear zone, which initiated the Gaoquan restraining bend in the basement during Jurassic. Later, these strike-slip structures, close to the mountain front, were reactivated during the N-S Mio-Pliocene contraction, and folded the upper décollements that characterized the localization of thin-skinned deformation. In contrast, in the further foreland, nonreactive strike-slip faults controlled basal décollement pinch-out, which localizes the thin-skinned deformation, resulting in en échelon folds that trace the strike of the deep strike-slip faults. The onset time of each anticline shows that the thin-skinned deformation first extended laterally and then propagated further north, resulting in ca. 7 km shortening along the whole foreland. Moreover, the shortening rate decreased eastward from 0.90 to 1.46 mm/yr along the Gaoquan-Kayindike structural line to 0.24–0.37 mm/yr along the Dunan structural line as the Sikeshu depression, constrained by the NW-trending Ai-Ka strike-slip fault, narrowed eastward. This feature implies that the width of the depression may control the amount of displacement propagation.","PeriodicalId":22351,"journal":{"name":"Tectonics","volume":"13 1","pages":""},"PeriodicalIF":4.2,"publicationDate":"2024-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139948356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Active Shortening Simultaneous to Normal Faulting Based on GNSS, Geophysical, and Geological Data: The Seismogenic Ventas de Zafarraya Fault (Betic Cordillera, Southern Spain) 基于全球导航卫星系统、地球物理和地质数据的与正断层同时发生的活动性缩短：产生地震的 Ventas de Zafarraya 断层（西班牙南部贝蒂奇科迪勒拉山系）

IF 4.2 1区地球科学

Tectonics Pub Date : 2024-02-08 DOI: 10.1029/2023tc007956

Asier Madarieta-Txurruka, Lourdes González-Castillo, José A. Peláez, Jesús Galindo-Zaldívar, María J. Borque, María C. Lacy, Antonio M. Ruiz-Armenteros, Jesús Henares, Patricia Ruano, Alberto Sánchez-Alzola, Manuel Avilés, Gracia Rodríguez-Caderot, Francisco José Martínez-Moreno, Víctor Tendero-Salmerón, Raquel Vinardell-Peña, Antonio J. Gil

{"title":"Active Shortening Simultaneous to Normal Faulting Based on GNSS, Geophysical, and Geological Data: The Seismogenic Ventas de Zafarraya Fault (Betic Cordillera, Southern Spain)","authors":"Asier Madarieta-Txurruka, Lourdes González-Castillo, José A. Peláez, Jesús Galindo-Zaldívar, María J. Borque, María C. Lacy, Antonio M. Ruiz-Armenteros, Jesús Henares, Patricia Ruano, Alberto Sánchez-Alzola, Manuel Avilés, Gracia Rodríguez-Caderot, Francisco José Martínez-Moreno, Víctor Tendero-Salmerón, Raquel Vinardell-Peña, Antonio J. Gil","doi":"10.1029/2023tc007956","DOIUrl":"https://doi.org/10.1029/2023tc007956","url":null,"abstract":"The central Betic Cordillera, southern Spain, is affected by an uplift related to the NNW–SSE Eurasia-Nubia convergence and shallow ENE–WSW orthogonal extension accommodated by the extensional system of the Granada Basin. The combination of geophysical, geodetic, and geological data reveals that the southwestern boundary of this extensional system is a seismically active compressional front extending from the W to the SW of the Granada Basin. The near-field Global Navigation Satellite System data determine NNE–SSW shortening of up to 2 mm/yr of the compressional front in the Zafarraya Polje. In this setting, the normal Ventas de Zafarraya Fault developed as a result of the bending-moment extension of the Sierra de Alhama antiform and was last reactivated during the 1884 Andalusian earthquake (Mw 6.5). The uplift in the central Betic Cordillera together with the subsidence in the Western Alborán Basin may facilitate a westward to southwestward gravitational collapse through the extensional detachment of the Granada Basin. The heterogeneous crust of the Betic Cordillera would generate the compressional front, which is divided into two sectors: thrusting to the west, and folding associated with buttressing to the south. Our results evidence that basal detachments, linking extensional fault activity with compressional fronts, may determine the activity of local surface structures and the geological hazard in densely populated regions.","PeriodicalId":22351,"journal":{"name":"Tectonics","volume":"18 1","pages":""},"PeriodicalIF":4.2,"publicationDate":"2024-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139757110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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