Tectonics最新文献_第2页

Shale 3D Flow and Interaction With Basement Faults in the Niger Delta Deep-Water Fold and Thrust Belt 页岩三维流动及与尼日尔三角洲深水褶皱和推力带基底断层的相互作用

IF 4.2 1区地球科学

Tectonics Pub Date : 2023-12-11 DOI: 10.1029/2023tc007957

V. Spina, S. Mazzoli

{"title":"Shale 3D Flow and Interaction With Basement Faults in the Niger Delta Deep-Water Fold and Thrust Belt","authors":"V. Spina, S. Mazzoli","doi":"10.1029/2023tc007957","DOIUrl":"https://doi.org/10.1029/2023tc007957","url":null,"abstract":"Based on a large 3D seismic data set in the deep-water domain of the Niger Delta, this study challenges previous interpretations involving the occurrence of multiple detachments and extensive thrust flats, illustrating timing and mode of shales flow at the toe of the gravity system. Five units of syn-kinematic sediments, reaching a maximum thickness of ∼800 m, accumulated in the tectonically subsiding synclines during fold amplification between ∼9.5 and ∼1.4 Ma. The volumes of syn-kinematic units roughly balance those of the shales accumulated in the thickened cores of WNW trending anticlines. This feature is consistent with folding resulting from buckling controlled by the competence contrast between isopach Cenozoic units and underlying overpressured shales of the Akata Formation. A dense network of NE-SW striking oblique extensional faults offsets a prominent anticline characterized by a NE-SW trend (which is almost perpendicular to the regional fold trend). These faults form a narrow, continuous deformation zone extending for tens of kilometers along and beyond the length of the anticline. The faults, rooting within the shales of the Akata Formation, formed since ∼5 Ma and deform the seabed. Displacement distribution suggests mechanical interaction between isolated fault segments within the deformation zone. The latter is interpreted as the shallow expression of a deep-seated fault zone inherited from the segmented passive margin and marked by gravity and magnetic data. Our results, providing a comprehensive picture of active deformation features and their relationships with deep-seated faults, shed new light into the modes of interaction between gravity systems and underlying basement structures.","PeriodicalId":22351,"journal":{"name":"Tectonics","volume":"57 1","pages":""},"PeriodicalIF":4.2,"publicationDate":"2023-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138566468","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

Identification of Source Faults of Large Earthquakes in the Turkey-Syria Border Region Between 1000 CE and the Present, and Their Relevance for the 2023 Mw 7.8 Pazarcık Earthquake 识别公元 1000 年至今土耳其-叙利亚边境地区大地震的震源断层及其与 2023 年帕扎克 7.8 级地震的相关性

IF 4.2 1区地球科学

Tectonics Pub Date : 2023-12-09 DOI: 10.1029/2023tc007890

S. Carena, A. M. Friedrich, A. Verdecchia, B. Kahle, S. Rieger, S. Kübler

{"title":"Identification of Source Faults of Large Earthquakes in the Turkey-Syria Border Region Between 1000 CE and the Present, and Their Relevance for the 2023 Mw 7.8 Pazarcık Earthquake","authors":"S. Carena, A. M. Friedrich, A. Verdecchia, B. Kahle, S. Rieger, S. Kübler","doi":"10.1029/2023tc007890","DOIUrl":"https://doi.org/10.1029/2023tc007890","url":null,"abstract":"The 6 February 2023, Mw 7.8 Pazarcık earthquake in the Turkey-Syria border region raises the question of whether such a large earthquake could have been foreseen, as well as what is the maximum possible magnitude (Mmax) of earthquakes on the East Anatolian Fault (EAF) system and on continental transform faults in general. To answer such questions, knowledge of past earthquakes and of their causative faults is necessary. Here, we integrate data from historical seismology, paleoseismology, archeoseismology, and remote sensing to identify the likely source faults of fourteen Mw ≥ 7 earthquakes between 1000 CE and the present in the region. We find that the 2023 Pazarcık earthquake could have been foreseen in terms of location (the EAF) and timing (an earthquake along this fault was if anything overdue), but not magnitude. We hypothesize that the maximum earthquake magnitude for the EAF is in fact 8.2, that is, a single end-to-end rupture of the entire fault, and that the 2023 Pazarcık earthquake did not reach Mmax by a fortuitous combination of circumstances. We conclude that such unusually large events are hard to model in terms of recurrence intervals, and that seismic hazard assessment along continental transforms cannot be done on individual fault systems but must include neighboring systems as well, because they are not kinematically independent at any time scale.","PeriodicalId":22351,"journal":{"name":"Tectonics","volume":"10 1","pages":""},"PeriodicalIF":4.2,"publicationDate":"2023-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138563944","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

Discovery of an Active Forearc Fault in an Urban Region: Holocene Rupture on the XEOLXELEK-Elk Lake Fault, Victoria, British Columbia, Canada 城市地区一条活动前弧断裂的发现:加拿大不列颠哥伦比亚省维多利亚市XEOLXELEK-Elk湖断裂的全新世断裂

IF 4.2 1区地球科学

Tectonics Pub Date : 2023-12-06 DOI: 10.1029/2023tc008170

Nicolas Harrichhausen, Theron Finley, Kristin D. Morell, Christine Regalla, Scott E. K. Bennett, Lucinda J. Leonard, Edwin Nissen, Eleanor McLeod, Emerson M. Lynch, Guy Salomon, Israporn Sethanant

{"title":"Discovery of an Active Forearc Fault in an Urban Region: Holocene Rupture on the XEOLXELEK-Elk Lake Fault, Victoria, British Columbia, Canada","authors":"Nicolas Harrichhausen, Theron Finley, Kristin D. Morell, Christine Regalla, Scott E. K. Bennett, Lucinda J. Leonard, Edwin Nissen, Eleanor McLeod, Emerson M. Lynch, Guy Salomon, Israporn Sethanant","doi":"10.1029/2023tc008170","DOIUrl":"https://doi.org/10.1029/2023tc008170","url":null,"abstract":"Subduction forearcs are subject to seismic hazard from upper plate faults that are often invisible to instrumental monitoring networks. Identifying active faults in forearcs therefore requires integration of geomorphic, geologic, and paleoseismic data. We demonstrate the utility of a combined approach in a densely populated region of Vancouver Island, Canada, by combining remote sensing, historical imagery, field investigations, and shallow geophysical surveys to identify a previously unrecognized active fault, the XEOLXELEK-Elk Lake fault, in the northern Cascadia forearc, ∼10 km north of the city of Victoria. Lidar-derived digital terrain models and historical air photos show a ∼2.5-m-high scarp along the surface of a Quaternary drumlinoid ridge. Paleoseismic trenching and electrical resistivity tomography surveys across the scarp reveal a single reverse-slip earthquake produced a fault-propagation fold above a blind southwest-dipping fault. Five geologically plausible chronological models of radiocarbon dated charcoal constrain the likely earthquake age to between 4.7 and 2.3 ka. Fault-propagation fold modeling indicates ∼3.2 m of reverse slip on a blind, 50° southwest-dipping fault can reproduce the observed deformation. Fault scaling relations suggest a M 6.1–7.6 earthquake with a 13 to 73-km-long surface rupture and 2.3–3.2 m of dip slip may be responsible for the deformation observed in the paleoseismic trench. An earthquake near this magnitude in Greater Victoria could result in major damage, and our results highlight the importance of augmenting instrumental monitoring networks with remote sensing and field studies to identify and characterize active faults in similarily challenging environments.","PeriodicalId":22351,"journal":{"name":"Tectonics","volume":"1 1","pages":""},"PeriodicalIF":4.2,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138541396","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

Polarity and Timing of the Deformation Along the Jinsha Suture Zone (Yushu Area, Northeastern Tibet) 藏东北玉树地区金沙缝合带变形的极性和时间特征

IF 4.2 1区地球科学

Tectonics Pub Date : 2023-12-06 DOI: 10.1029/2023tc007888

Fanny Goussin, Stéphane Guillot, Gilles Ruffet, Marc Poujol, Émilien Oliot, Anne Replumaz, Carole Cordier, Guillaume Dupont-Nivet, Pierrick Roperch

{"title":"Polarity and Timing of the Deformation Along the Jinsha Suture Zone (Yushu Area, Northeastern Tibet)","authors":"Fanny Goussin, Stéphane Guillot, Gilles Ruffet, Marc Poujol, Émilien Oliot, Anne Replumaz, Carole Cordier, Guillaume Dupont-Nivet, Pierrick Roperch","doi":"10.1029/2023tc007888","DOIUrl":"https://doi.org/10.1029/2023tc007888","url":null,"abstract":"The Tibetan Plateau was formed by intense Cenozoic shortening (up to 1,100 km) of a composite “proto-Tibet,” itself the product of a long Paleozoic and Mesozoic history of accretion of Gondwana-derived continental fragments and volcanic arcs against the Asian continental margin. The difficult access and the scarcity of outcrops have long limited the possibilities of studying these Mesozoic suture zones in the heart of the Plateau. In this work, we present new U-Pb and 40Ar/39Ar ages from the highly deformed units of the Yushu mélange, along the Jinsha Suture in the northeastern Qiangtang terrane. Early Triassic (c. 253 Ma) to Middle Jurassic ages (c. 165 Ma) complement the existing data set and help to refine the chronology of the Paleo-Tethyan oceanic subductions which have structured the northeastern part of the Qiangtang terrane. The Yushu mélange records at least three successive tectono-magmatic events. The opening of a back-arc basin during the northward Paleo-Tethyan subduction along the Longmu Co-Shuanghu Suture during Early to Middle Triassic; then its closure during the southward subduction of the Songpan-Ganze Ocean along the Jinsha Suture in Late Triassic. Finally, a shortening phase related to the continental collision of the Songpan-Ganze and Qiangtang blocks from Late Triassic to Early-Middle Jurassic. No evidence for any high- or mid-temperature Cenozoic reactivation of the Jinsha suture in our study area is recorded.","PeriodicalId":22351,"journal":{"name":"Tectonics","volume":"61 1","pages":""},"PeriodicalIF":4.2,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138541380","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

Role of Mantle Drag on the Tectonics of Subduction Zones: Insights From Laboratory Models 地幔阻力对俯冲带构造的作用：实验室模型的启示

IF 4.2 1区地球科学

Tectonics Pub Date : 2023-12-01 DOI: 10.1029/2023tc008018

T. Geffroy, B. Guillaume, M. Simoes, A. Replumaz, R. Lacassin, L. Husson, J. Kermarrec

{"title":"Role of Mantle Drag on the Tectonics of Subduction Zones: Insights From Laboratory Models","authors":"T. Geffroy, B. Guillaume, M. Simoes, A. Replumaz, R. Lacassin, L. Husson, J. Kermarrec","doi":"10.1029/2023tc008018","DOIUrl":"https://doi.org/10.1029/2023tc008018","url":null,"abstract":"Along convergent boundaries, the role played by mantle drag remains poorly understood despite its potential impact on subduction dynamics and in turn on the deformation regime of the overriding plate. In this study, we present 11 three‐dimensional analog models of subduction including an overriding plate, in which mantle drag at the base of the lower or upper plate results from an imposed unidirectional horizontal mantle flow perpendicular to the trench, and in which the plate opposite to the flow is fixed. We varied the direction and the velocity of the imposed horizontal mantle flow between 0 and 10 cm/yr to quantify its impact on horizontal and vertical upper plate deformation, velocities of plates and subduction, and slab geometry. In our experiments, we show that a mantle flow lower than 5 cm/yr tends to laterally translate the slab rather than to generate internal deformation, resulting in limited differences in slab geometries between models. We also show that plate velocity correlates linearly with the imposed mantle flow velocity and associated mantle drag. The upper plate most often deforms by trench‐orthogonal shortening, with shortening rates increasing linearly with mantle flow. Shortening rates are higher when mantle flow is directed toward the fixed upper plate and when the slab has not yet reached the upper‐lower mantle discontinuity. Minimum trench‐orthogonal shortening rates of 2.5 × 10−15 s−1 are required to thicken upper plates. This study suggests that mantle drag can exert first‐order controls on the dynamics of subduction zones and associated tectonics.","PeriodicalId":22351,"journal":{"name":"Tectonics","volume":"51 18","pages":""},"PeriodicalIF":4.2,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138993364","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

Building and Collapse of the Cadomian Orogen: A Plate-Scale Model Based on Structural Data From the SW Iberian Massif 卡多米亚造山带的构造与崩塌:基于伊比利亚西南地块构造数据的板块尺度模型

IF 4.2 1区地球科学

Tectonics Pub Date : 2023-11-30 DOI: 10.1029/2023tc007990

Diana Moreno-Martín, Rubén Díez Fernández, Ricardo Arenas, Esther Rojo-Pérez, Irene Novo-Fernández, Sonia Sánchez Martínez

{"title":"Building and Collapse of the Cadomian Orogen: A Plate-Scale Model Based on Structural Data From the SW Iberian Massif","authors":"Diana Moreno-Martín, Rubén Díez Fernández, Ricardo Arenas, Esther Rojo-Pérez, Irene Novo-Fernández, Sonia Sánchez Martínez","doi":"10.1029/2023tc007990","DOIUrl":"https://doi.org/10.1029/2023tc007990","url":null,"abstract":"The Cadomian Orogeny produced a subduction-related orogen along the periphery of Gondwana and configured the pre-Variscan basement of the Iberian Massif. The architecture of the Cadomian Orogen requires detailed structural analysis for reconstruction because of severe tectonic reworking during the Paleozoic (Variscan cycle). Tectonometamorphic analysis and data compilation in SW Iberia (La Serena Massif, Spain) have allowed the identification of three Cadomian deformation phases and further constrained the global architecture and large-scale processes that contributed to the Ediacaran building and early Paleozoic dismantling of the Cadomian Orogen. The first phase (DC1, prior to 573 Ma) favored tabular morphology in plutons that intruded during the building of a continental arc. The second phase (DC2, 573–535 Ma) produced an upright folding and contributed to further crustal thickening. The third phase of deformation (DC3, ranging between ∼535 and ∼480 Ma) resulted in an orogen-parallel dome with oblique extensional flow. DC1 represents the crustal growth and thickening stage. DC2 is synchronous with a period of crustal thickening that affected most of the Gondwanan periphery, from the most external sections (Cadomian fore-arc) to the inner ones (Cadomian back-arc). We explain DC2 as a consequence of flat subduction, which was followed by a period dominated by crustal extension (DC3) upon roll-back of the lower plate. The Ediacaran construction of the Cadomian Orogen (DC1 and DC2) requires ongoing subduction beneath Gondwana s.l., whereas its dismantlement during the Early Paleozoic is compatible with oblique, sinistral convergence.","PeriodicalId":22351,"journal":{"name":"Tectonics","volume":"40 1","pages":""},"PeriodicalIF":4.2,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138541372","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

Devonian to Early Carboniferous Retreating—Advancing Subduction Switch in the Northwestern Patagonia Accretionary Orogen: U-Pb and Lu-Hf Isotopic Insights 西北巴塔哥尼亚增生造山带泥盆纪至早石炭世退进俯冲开关:U-Pb和Lu-Hf同位素的认识

IF 4.2 1区地球科学

Tectonics Pub Date : 2023-11-15 DOI: 10.1029/2022tc007533

Paulo Marcos, Emiliano M. Renda, Pablo D. González, Sebastián Oriolo, Nicolás Scivetti, Leonardo Benedini, Mauro Geraldes, Daniel Gregori, María Belén Yoya, Marcos Bahía

{"title":"Devonian to Early Carboniferous Retreating—Advancing Subduction Switch in the Northwestern Patagonia Accretionary Orogen: U-Pb and Lu-Hf Isotopic Insights","authors":"Paulo Marcos, Emiliano M. Renda, Pablo D. González, Sebastián Oriolo, Nicolás Scivetti, Leonardo Benedini, Mauro Geraldes, Daniel Gregori, María Belén Yoya, Marcos Bahía","doi":"10.1029/2022tc007533","DOIUrl":"https://doi.org/10.1029/2022tc007533","url":null,"abstract":"In this contribution, we present new early middle Devonian igneous and metaigneous units with a major juvenile magmatic source input in the North Patagonian Massif, which were discovered through U‐Pb and Lu‐Hf zircon analyses. Afterward, we assessed their tectonic implications for northwestern Patagonia and then for southern South America, combining our results with available database information consisting of igneous crystallization ages and isotopic data of the Devonian to early Carboniferous magmatic units, tectonic‐metamorphic analyses, and thermochronologic record. This study allows for distinguishing retreating and advancing subduction switching in northwestern Patagonia (38°30′ to 44°S) and a contrasting coetaneous evolution for basement outcrops exposed further north (27°30′ and 37°30′S). The early middle Devonian (400–380 Ma) northwestern Patagonian magmatism is characterized by widespread magmatism and positive εHf–εNd linked to forearc and backarc magmatism that evolved within a retreating subduction stage. A tectonic switching toward advancing orogeny stage began in the late Devonian, evidenced by a lull in magmatic activity with a negative εHf–εNd trend, possibly contemporaneous with the first tectonic‐metamorphic event in western Patagonia. An early Carboniferous magmatic gap, followed by the subsequent development of the main foliation in the basement during the Carboniferous‐Permian period, denotes the acme of this contractional stage. In contrast, the Devonian period in the northern segment is characterized by mostly negative εHf–εNd values, reverse shear zone activity in the foreland, and an inboard magmatism migration, evidencing a compressive tectonic setting that changed to an extensional configuration in the early Carboniferous with widespread arc magmatism development.","PeriodicalId":22351,"journal":{"name":"Tectonics","volume":"4 1","pages":""},"PeriodicalIF":4.2,"publicationDate":"2023-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138541379","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 Deformed Wedge‐Top Basin Inverted During the Collapse of the Variscan Belt: The Permo‐Carboniferous Lorraine Basin (NE France) 瓦里斯坎断裂带崩塌期间一个变形的楔顶盆地:法国东北部二叠系-石炭系洛林盆地

1区地球科学

Tectonics Pub Date : 2023-11-01 DOI: 10.1029/2022tc007668

R. Hemelsdaël, O. Averbuch, L. Beccaletto, A. Izart, S. Marc, L. Capar, R. Michels

{"title":"A Deformed Wedge‐Top Basin Inverted During the Collapse of the Variscan Belt: The Permo‐Carboniferous Lorraine Basin (NE France)","authors":"R. Hemelsdaël, O. Averbuch, L. Beccaletto, A. Izart, S. Marc, L. Capar, R. Michels","doi":"10.1029/2022tc007668","DOIUrl":"https://doi.org/10.1029/2022tc007668","url":null,"abstract":"Abstract A new structural model is presented for the Permo‐Carboniferous Lorraine Basin (NE France), a major intramountain basin that developed during the latest stages of the Variscan orogeny (ca. 315–270 Ma). Digitalized well logs and reprocessed seismic data were used to decipher the kinematic evolution of this basin located along the Rhenohercynian orogenic suture zone. The basin was initiated during the late collision stage (Early to Middle Pennsylvanian) in a wedge‐top position upon the Saxothuringian retro‐wedge. The syn‐orogenic sequence is delimited to the north by the major SE‐verging Metz Thrust, which is part of the backthrust system that propagated during Middle Pennsylvanian (Late Westphalian). Seismic data provide evidence of negative tectonic inversion, allowing the formation of syn‐rift depocenters (Late Pennsylvanian‐Early Permian) above the former anticlines. Erosion of these anticlines results in a major unconformity marking the onset of post‐orogenic collapse. The late Early Permian shortening (Saalian phase) is suggested to reactivate former thrusts and normal faults, thus generating late uplift of the basin. The post‐orogenic phase is complex and diachronous at basin scale, and both compression and extension can be recorded in the same area over a short period (<10 Myr). The Late Carboniferous negative tectonic inversion along the Rhenohercynian suture zone is proposed to result from the lithospheric delamination of the Variscan orogenic roots. The associated upwelling of asthenospheric material is recorded by intense magmatic activity, and can be, in turn, considered as the main trigger for the subsequent thermal subsidence of the Mesozoic Paris Basin.","PeriodicalId":22351,"journal":{"name":"Tectonics","volume":"58 1-2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135715081","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

Alpine Ductile Deformation of the Upper Iberian Collided Margin (Eaux‐Chaudes Massif, West‐Central Pyrenean Hinterland, France) 上伊比利亚碰撞边缘的高山韧性变形(法国比利牛斯山脉中西部的Eaux - Chaudes地块)

1区地球科学

Tectonics Pub Date : 2023-11-01 DOI: 10.1029/2023tc007828

Norbert Caldera, Antonio Teixell, Albert Griera, Pierre Labaume, Marc Guardia

{"title":"Alpine Ductile Deformation of the Upper Iberian Collided Margin (Eaux‐Chaudes Massif, West‐Central Pyrenean Hinterland, France)","authors":"Norbert Caldera, Antonio Teixell, Albert Griera, Pierre Labaume, Marc Guardia","doi":"10.1029/2023tc007828","DOIUrl":"https://doi.org/10.1029/2023tc007828","url":null,"abstract":"Abstract The Eaux‐Chaudes massif provides keys to unravel the deep‐seated deformation of the Iberian rifted margin during the Alpine orogeny in the Pyrenees. The massif conforms to an inlier of upper Cretaceous carbonate rocks within the Paleozoic basement of the western Axial Zone, originally deposited in the upper margin shelf before the Cenozoic collision. New geological mapping and cross‐section construction lead to the description of the lateral structural variation from a km‐scale fold nappe in the west to a ductile, imbricate fold‐thrust fan in the east. The transition from a Variscan pluton to Devonian metasediments underlying the autochthonous Cretaceous induced this structural change. Recumbent folding, which involved upper Paleozoic rocks, was facilitated by a lower detachment in Silurian slates and an upper detachment in an overlying Keuper shale and evaporite thrust sheet. Remnants of this allochthonous sheet form shale and ophite bodies pinched within the upper Cretaceous carbonates, conforming unusual tertiary welds. Ductile shear in the overturned limb of the Eaux‐Chaudes fold nappe imparted strong mylonitic foliation in carbonate rocks, often accompanied by N‐S stretching lineation and top‐to‐the‐south kinematic indicators. The burial of the massif by basement‐involved thrust sheets and the Keuper sheet, along with their Mesozoic‐Cenozoic cover, account for ductile deformation conditions and a structural style not reported hitherto for the Alpine Pyrenees. A hypothesis for the tectonic restoration of this part of the Pyrenean hinterland is finally proposed.","PeriodicalId":22351,"journal":{"name":"Tectonics","volume":"100 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135411858","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

Exploring the Connection of XVI‐Century Major Historical Earthquakes in the Eastern Betic Cordillera, Spain: Insights From Viscoelastic Relaxation of the Lithosphere 探索西班牙东贝提克山脉16世纪历史大地震的联系:来自岩石圈粘弹性松弛的见解

1区地球科学

Tectonics Pub Date : 2023-11-01 DOI: 10.1029/2023tc007917

Pouye Yazdi, Julián García‐Mayordomo, José Antonio Álvarez‐Gómez, Jorge Miguel Gaspar‐Escribano, Eulália Masana

{"title":"Exploring the Connection of XVI‐Century Major Historical Earthquakes in the Eastern Betic Cordillera, Spain: Insights From Viscoelastic Relaxation of the Lithosphere","authors":"Pouye Yazdi, Julián García‐Mayordomo, José Antonio Álvarez‐Gómez, Jorge Miguel Gaspar‐Escribano, Eulália Masana","doi":"10.1029/2023tc007917","DOIUrl":"https://doi.org/10.1029/2023tc007917","url":null,"abstract":"Abstract Understanding the crustal fault interaction and connection between earthquakes in areas with slow tectonic deformation, such as Betic Cordillera (South Spain), is challenging. When seismic rates are low and large destructive earthquakes happen less frequently, it is necessary to resort to historical or paleoseismic records. This study investigates the postseismic viscoelastic relaxation mechanism as a potential explanation for the occurrence of three historical earthquakes (I EMS VIII‐IX) in the Eastern Betic Shear Zone during the XVI‐century, all of which occurred within a span of 13 years: 1518 Vera Mw6.2, 1522 Alhama de Almeria Mw6.5, and 1531 Baza Mw6.2 associated with the Palomares, Carboneras, and Baza faults, respectively. The results strongly suggest a sequential stress‐triggering connection between the three events. The northern NS‐oriented section of the Baza fault is found to have experienced a larger positive ΔCFS and, indeed, more prone to rupture in 1531. The study also examines whether the cumulative ΔCFS had influenced the occurrence of further significant earthquakes (≥Mw6.0) in the region. A triggering connection between the cascade and the 1658 Almeria Mw6.2 earthquake is suggested, whereas no indications of similar linkage to the 1674 Lorca Mw6.0 or the 1804 Dalias Mw6.4 events are found. The stress triggering impact of the cascade over nearby active faults is noteworthy. It is expected that this analysis could have future applications for studying other important historical events, and improving seismic hazard analysis in complex fault settings of the Betic Cordillera.","PeriodicalId":22351,"journal":{"name":"Tectonics","volume":"57 3-4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135715083","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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