Pub Date : 2024-05-10DOI: 10.31577/geolcarp.2024.04
J. Kuśmierek, Urszula Baran, Grzegorz Machowski
: The deeply buried, northeastern segment of the fold-and-thrust belt of the Outer Carpathians is contoured by synorogenic sediments (Upper Oligocene–Lower Miocene) of tectonically multiplied thicknesses, which mask the deep-seated structures. Integration of archival mappings and profiles of deep wells with the new generation of geological-seismic cross-sections reveals the unconformable position of asymmetric folds and duplexes built of synorogenic sediments, resting upon the older flysch formations (Cretaceous–Lower Paleogene). These structures are cut by a system of dislocated, monovergent, imbricated overthrusts, deeply rooted in the outer zones of thrust folds. These zones are associated with deep-seated, high-amplitude (up to several kilometres), Meso–Paleozoic and Precambrian faults originated by subduction of the European Platform. As revealed by geological reinterpretation of MT-1 magnetotelluric soundings, the time/space identification of longitudinal, compressional sutures rotated by transversal, transpressional faults suggests a segmented model of subduction of the platform basement. Its coincidence with the reconstructed kinematic evolution of sedimentary covers justifies the origin of the inversion tectonics of the Central Depression of the Outer Carpathians as a result of the heterogenic structure of the consolidated basement.
{"title":"Inversion of deep-seated tectonics in the Central Depression of the Outer Carpathians (SE Poland)","authors":"J. Kuśmierek, Urszula Baran, Grzegorz Machowski","doi":"10.31577/geolcarp.2024.04","DOIUrl":"https://doi.org/10.31577/geolcarp.2024.04","url":null,"abstract":": The deeply buried, northeastern segment of the fold-and-thrust belt of the Outer Carpathians is contoured by synorogenic sediments (Upper Oligocene–Lower Miocene) of tectonically multiplied thicknesses, which mask the deep-seated structures. Integration of archival mappings and profiles of deep wells with the new generation of geological-seismic cross-sections reveals the unconformable position of asymmetric folds and duplexes built of synorogenic sediments, resting upon the older flysch formations (Cretaceous–Lower Paleogene). These structures are cut by a system of dislocated, monovergent, imbricated overthrusts, deeply rooted in the outer zones of thrust folds. These zones are associated with deep-seated, high-amplitude (up to several kilometres), Meso–Paleozoic and Precambrian faults originated by subduction of the European Platform. As revealed by geological reinterpretation of MT-1 magnetotelluric soundings, the time/space identification of longitudinal, compressional sutures rotated by transversal, transpressional faults suggests a segmented model of subduction of the platform basement. Its coincidence with the reconstructed kinematic evolution of sedimentary covers justifies the origin of the inversion tectonics of the Central Depression of the Outer Carpathians as a result of the heterogenic structure of the consolidated basement.","PeriodicalId":12545,"journal":{"name":"Geologica Carpathica","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140993461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-05-10DOI: 10.31577/geolcarp.2024.03
D. Plašienka, Miroslav Bielik
: We provide an analysis of the existing 2D and 3D gravimetric and magnetic interpretations of the well-known and significant Kolárovo gravity and magnetic anomaly, as well as present a new geological interpretation of its origin. It follows that the source of these anomalies is a high-density and highly magnetic crustal body with the following parameters: (a) density contrast is between +0.28 and +0.31 g cm −3 , (b) magnetic susceptibility is ~22000×10 −6 units of SI, (c) the depth of the upper boundary varies from ~4.5 to 6.0 km, (d) the depth of the center of the gravity body is between 8.7 and 12.5 km, and (e) the depth of the lower boundary moves in the interval from above 13 to 20 km. These factors and the inferred tectonic position of the Kolárovo body allow for its interpretation as a possible eclogite/ ultramafite body. It occurs within a belt of magnetic and gravity anomalies tracing the Eo-Alpine high-pressure metamorphic complexes from the Eastern Alps to the Western Carpathians via the northern periphery of the Rába–Hurbanovo– Diósjenő fault zone. We assume that the position of the Kolárovo crustal body resulted from the Oligocene–Lower Miocene uplift of the East Alpine–West Carpathian junction caused by the compressional tectonic regime accompanied by crustal thickening, surface uplift, and erosion of units forming the present basement of the Danube Basin. Simulta-neously, exhumation of the orogenic infrastructure occurred, which thus affected the Eo-Alpine metamorphic complexes, including the anomalous Kolárovo body. Subsequently, during the Middle–Late Miocene rifting and subsidence of the Danube Basin, the Kolárovo body was buried to its present position.
{"title":"The Kolárovo gravity and magnetic anomaly body in a subcrop of the Danube Basin: A new geological interpretation","authors":"D. Plašienka, Miroslav Bielik","doi":"10.31577/geolcarp.2024.03","DOIUrl":"https://doi.org/10.31577/geolcarp.2024.03","url":null,"abstract":": We provide an analysis of the existing 2D and 3D gravimetric and magnetic interpretations of the well-known and significant Kolárovo gravity and magnetic anomaly, as well as present a new geological interpretation of its origin. It follows that the source of these anomalies is a high-density and highly magnetic crustal body with the following parameters: (a) density contrast is between +0.28 and +0.31 g cm −3 , (b) magnetic susceptibility is ~22000×10 −6 units of SI, (c) the depth of the upper boundary varies from ~4.5 to 6.0 km, (d) the depth of the center of the gravity body is between 8.7 and 12.5 km, and (e) the depth of the lower boundary moves in the interval from above 13 to 20 km. These factors and the inferred tectonic position of the Kolárovo body allow for its interpretation as a possible eclogite/ ultramafite body. It occurs within a belt of magnetic and gravity anomalies tracing the Eo-Alpine high-pressure metamorphic complexes from the Eastern Alps to the Western Carpathians via the northern periphery of the Rába–Hurbanovo– Diósjenő fault zone. We assume that the position of the Kolárovo crustal body resulted from the Oligocene–Lower Miocene uplift of the East Alpine–West Carpathian junction caused by the compressional tectonic regime accompanied by crustal thickening, surface uplift, and erosion of units forming the present basement of the Danube Basin. Simulta-neously, exhumation of the orogenic infrastructure occurred, which thus affected the Eo-Alpine metamorphic complexes, including the anomalous Kolárovo body. Subsequently, during the Middle–Late Miocene rifting and subsidence of the Danube Basin, the Kolárovo body was buried to its present position.","PeriodicalId":12545,"journal":{"name":"Geologica Carpathica","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140992918","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-05-10DOI: 10.31577/geolcarp.2024.02
Ján Spišiak, Milan Kohút, Juraj Butek, Š. Ferenc, V. Šimonová, Richard Kopáčik, D. Chew
: The gabbro-dioritoid rocks from Veľké Železné (Nízke Tatry Mts., Western Carpathians, Slovakia) were recently studied in order to better understand the age, origin, and evolution of the basic/intermediate magmas associated with Variscan granitic rocks. Their genesis was investigated from the points of view of petrology, whole-rock geo-chemistry (including Sr, Nd, and Pb isotopic characteristics), as well as U–Th–Pb zircon and apatite dating. The Famennian magmatic crystallization age of ca. 360 Ma (determined from zircon: 362.4 ± 2.9 Ma and apatite: 358.4 ± 2.8 Ma) is older than the Tournaisian–Visean ages for granite intrusions in the Tatric Unit. Geochemically, the studied rocks have an affinity to arc-related basalts, consisting of a metaluminous, magnesian, and high-potassium calc-alkaline character. Isotope data (i.e., ( 87 Sr/ 86 Sr) 360 = 0.7035−0.7044 and εNd 360 = +1.4 to +1.6) demonstrate that these gabbro-dioritoids were formed from the mantle-influenced, lower crustal and/or sub-continental lithospheric mantle (SCLM) sources, whereas the unsystematic increase of Pb isotope ratios indicate either the melting of an ancient Enriched mantle-II (EM-II) reservoir or the upper crustal assimilation and/or local fluid alteration. The data presented in this paper favour the origin of the studied gabbro-dioritoids at a continental arc, although we cannot rule out their genesis as a result of the subsequent slab break-off.
{"title":"The petrology and geochronology of the gabbro-dioritoid rocks from Veľké Železné (Nízke Tatry Mts., Western Carpathians)","authors":"Ján Spišiak, Milan Kohút, Juraj Butek, Š. Ferenc, V. Šimonová, Richard Kopáčik, D. Chew","doi":"10.31577/geolcarp.2024.02","DOIUrl":"https://doi.org/10.31577/geolcarp.2024.02","url":null,"abstract":": The gabbro-dioritoid rocks from Veľké Železné (Nízke Tatry Mts., Western Carpathians, Slovakia) were recently studied in order to better understand the age, origin, and evolution of the basic/intermediate magmas associated with Variscan granitic rocks. Their genesis was investigated from the points of view of petrology, whole-rock geo-chemistry (including Sr, Nd, and Pb isotopic characteristics), as well as U–Th–Pb zircon and apatite dating. The Famennian magmatic crystallization age of ca. 360 Ma (determined from zircon: 362.4 ± 2.9 Ma and apatite: 358.4 ± 2.8 Ma) is older than the Tournaisian–Visean ages for granite intrusions in the Tatric Unit. Geochemically, the studied rocks have an affinity to arc-related basalts, consisting of a metaluminous, magnesian, and high-potassium calc-alkaline character. Isotope data (i.e., ( 87 Sr/ 86 Sr) 360 = 0.7035−0.7044 and εNd 360 = +1.4 to +1.6) demonstrate that these gabbro-dioritoids were formed from the mantle-influenced, lower crustal and/or sub-continental lithospheric mantle (SCLM) sources, whereas the unsystematic increase of Pb isotope ratios indicate either the melting of an ancient Enriched mantle-II (EM-II) reservoir or the upper crustal assimilation and/or local fluid alteration. The data presented in this paper favour the origin of the studied gabbro-dioritoids at a continental arc, although we cannot rule out their genesis as a result of the subsequent slab break-off.","PeriodicalId":12545,"journal":{"name":"Geologica Carpathica","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140991773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-05-10DOI: 10.31577/geolcarp.2024.01
F. Massari, Giuseppe Cadel, Cristina Stefani
: This study aims at identifying the source area(s) of two populations of exotic pebbles/cobbles present as drift-wood dropstones in the upper Turonian to Coniacian pelagic layers of the Scaglia Rossa, as well as gravity flow deposits in the Santonian Sirone Conglomerate of the Lombardian Flysch. The clast assemblage indicates that the main source(s) were the structurally highest Austroalpine units of the Eo-Alpine orogenic edifice of the Eastern Alps and the Transdanubian Range; the erosion of such units produced Gosau-type gravels that, after local elaboration in high-energy settings, were resedimented into the Southalpine basins. Despite the affinities shown by the clast composition with the lithofacies of the Lombardian stratigraphic succession, origin from a central-Southalpine early orogenic retrobelt edifice can be reasonably excluded, since the onset of uplift and denudation of the Southern Alps occurred in the Late Oligocene. In Santonian times, a complementary source fed the Sirone Conglomerate and likely contributed the Kainach Gosau basin with clasts of Southalpine rocks. This source is inferred to have coincided with an emerging belt located in the eastern Southalpine domain, produced by transpression along the proto-Periadriatic Lineament. Ophiolitic detritus may have reached the Central Alpine and Southalpine areas during the Early Cretaceous; in contrast, the exhumation and uplift of the Koralpe–Wölz high-pressure belt and of its uppermost Austroalpine nappe cover at 89–84 Ma, likely separated the Southalpine retrobelt basins from ‘northern’ sources.
{"title":"Exotic clasts of Upper Cretaceous Southalpine units (N Italy) point to uplift and erosion of uppermost Austroalpine (Eastalpine and Transdanubian) and E-Southalpine sources","authors":"F. Massari, Giuseppe Cadel, Cristina Stefani","doi":"10.31577/geolcarp.2024.01","DOIUrl":"https://doi.org/10.31577/geolcarp.2024.01","url":null,"abstract":": This study aims at identifying the source area(s) of two populations of exotic pebbles/cobbles present as drift-wood dropstones in the upper Turonian to Coniacian pelagic layers of the Scaglia Rossa, as well as gravity flow deposits in the Santonian Sirone Conglomerate of the Lombardian Flysch. The clast assemblage indicates that the main source(s) were the structurally highest Austroalpine units of the Eo-Alpine orogenic edifice of the Eastern Alps and the Transdanubian Range; the erosion of such units produced Gosau-type gravels that, after local elaboration in high-energy settings, were resedimented into the Southalpine basins. Despite the affinities shown by the clast composition with the lithofacies of the Lombardian stratigraphic succession, origin from a central-Southalpine early orogenic retrobelt edifice can be reasonably excluded, since the onset of uplift and denudation of the Southern Alps occurred in the Late Oligocene. In Santonian times, a complementary source fed the Sirone Conglomerate and likely contributed the Kainach Gosau basin with clasts of Southalpine rocks. This source is inferred to have coincided with an emerging belt located in the eastern Southalpine domain, produced by transpression along the proto-Periadriatic Lineament. Ophiolitic detritus may have reached the Central Alpine and Southalpine areas during the Early Cretaceous; in contrast, the exhumation and uplift of the Koralpe–Wölz high-pressure belt and of its uppermost Austroalpine nappe cover at 89–84 Ma, likely separated the Southalpine retrobelt basins from ‘northern’ sources.","PeriodicalId":12545,"journal":{"name":"Geologica Carpathica","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140990336","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-01DOI: 10.31577/geolcarp.2023.27
N. Bonev, P. Filipov
{"title":"Detrital zircon age constraints on low-grade sedimentary successions of the eastern Circum-Rhodope Belt, Bulgaria","authors":"N. Bonev, P. Filipov","doi":"10.31577/geolcarp.2023.27","DOIUrl":"https://doi.org/10.31577/geolcarp.2023.27","url":null,"abstract":"","PeriodicalId":12545,"journal":{"name":"Geologica Carpathica","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139821606","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-01DOI: 10.31577/geolcarp.2023.26
Milica Mrdak, Eva Wagerer, M. Sudar, N. Djerić, Martin Đaković, H. Gawlick
{"title":"Demise of the Wetterstein Carbonate Platform and onset of the Dachstein Carbonate Platform recorded in deep-water successions of the East Bosnian-Durmitor megaunit (Pliješevina, northern Montenegro, Dinarides)","authors":"Milica Mrdak, Eva Wagerer, M. Sudar, N. Djerić, Martin Đaković, H. Gawlick","doi":"10.31577/geolcarp.2023.26","DOIUrl":"https://doi.org/10.31577/geolcarp.2023.26","url":null,"abstract":"","PeriodicalId":12545,"journal":{"name":"Geologica Carpathica","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139826834","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-01DOI: 10.31577/geolcarp.2023.25
Michal Šujan, Kishan Aherwar, Andrej Chyba, Barbara Rózsová, R. Braucher, M. Šujan, F. Šipka, Aster Team
Successions deposited under rifting and post-rift settings of an isolated epicontinental basin often exhibit contrasting characteristics. Facies linked to transgression during basin rifting are typically locally sourced fan deltas transporting coarse-grained sediment, whereas the post-rift setup generally involves a normal regression marked by more extensive catchments, sediment sourced from greater distances, and an overall decrease in average grain size compared to the transgressive facies. In this study, we present a specific scenario based on a sedimentological, stratigraphic, and authigenic 10Be/9Be analysis of the Nemčiňany Formation, an Upper Miocene fan deltaic succession in the eastern Danube Basin, Slovakia. Deposition of the Nemčiňany Fm. was initiated shortly after ~11.6 Ma by the fourth rifting phase of the Pannonian Basin System, triggering the transgression of Lake Pannon. The depositional system persisted until ~9.6 Ma, likely balancing the increased accommodation rate with sediment supply in the shallow lake area situated on a basement high. Subsequently, a relative decrease in the accommodation rate prompted the progradation of shelf-slope scale clinoforms, originating from the Nemčiňany depositional system, toward the center of the Komjatice depression at ~9.4 Ma, resulting in a normal regression of Lake Pannon. The persistence of the Nemčiňany fan delta system, unlike common stratigraphic patterns, was associated to the high sediment supply yielded by the paleo-Hron river, which entered the basin in the study area. These observations underscore the need for caution in predicting provenance shifts during changes in geodynamic stages of a basin.
一个孤立的上大陆盆地在断裂和断裂后环境下沉积的沉积物往往表现出截然不同的特征。与盆地断裂期间的横断面有关的沉积物通常是来自当地的扇三角洲，搬运的是粗粒沉积物，而断裂后的沉积物通常是正常的回归，其特点是集水范围更广，沉积物来自更远的地方，与横断面相比，平均粒度总体上有所减小。在本研究中，我们根据对斯洛伐克多瑙河盆地东部上新世扇三角洲演替 Nemčiňany Formation 的沉积学、地层学和自生 10Be/9Be 分析，提出了一种具体的方案。Nemčiňany Fm.沉积是在约 11.6 Ma 后不久，由潘诺尼亚盆地系统的第四期裂谷引发潘诺尼亚湖的横断而开始的。该沉积系统一直持续到 ~9.6 Ma，很可能是为了平衡位于基底高地的浅湖区的沉积物供应与增加的容纳率。随后，随着容纳率的相对降低，源自 Nemčiňany 沉积系统的陆架-斜坡规模的岩屑地貌在大约 9.4 Ma 时向 Komjatice 凹陷中心逐渐移动，导致潘农湖的正常回归。与常见地层模式不同的是，内姆奇ňany 扇三角洲系统的持续存在与进入研究区域盆地的古伦河产生的大量沉积物有关。这些观察结果表明，在预测盆地地球动力学阶段变化期间的产状转变时需要谨慎。
{"title":"Surviving from transgression to regression of Lake Pannon: Fan deltas of the Nemčiňany Fm. persisted across the rifting until the post-rift stage of the Danube Basin, western Slovakia","authors":"Michal Šujan, Kishan Aherwar, Andrej Chyba, Barbara Rózsová, R. Braucher, M. Šujan, F. Šipka, Aster Team","doi":"10.31577/geolcarp.2023.25","DOIUrl":"https://doi.org/10.31577/geolcarp.2023.25","url":null,"abstract":"Successions deposited under rifting and post-rift settings of an isolated epicontinental basin often exhibit contrasting characteristics. Facies linked to transgression during basin rifting are typically locally sourced fan deltas transporting coarse-grained sediment, whereas the post-rift setup generally involves a normal regression marked by more extensive catchments, sediment sourced from greater distances, and an overall decrease in average grain size compared to the transgressive facies. In this study, we present a specific scenario based on a sedimentological, stratigraphic, and authigenic 10Be/9Be analysis of the Nemčiňany Formation, an Upper Miocene fan deltaic succession in the eastern Danube Basin, Slovakia. Deposition of the Nemčiňany Fm. was initiated shortly after ~11.6 Ma by the fourth rifting phase of the Pannonian Basin System, triggering the transgression of Lake Pannon. The depositional system persisted until ~9.6 Ma, likely balancing the increased accommodation rate with sediment supply in the shallow lake area situated on a basement high. Subsequently, a relative decrease in the accommodation rate prompted the progradation of shelf-slope scale clinoforms, originating from the Nemčiňany depositional system, toward the center of the Komjatice depression at ~9.4 Ma, resulting in a normal regression of Lake Pannon. The persistence of the Nemčiňany fan delta system, unlike common stratigraphic patterns, was associated to the high sediment supply yielded by the paleo-Hron river, which entered the basin in the study area. These observations underscore the need for caution in predicting provenance shifts during changes in geodynamic stages of a basin.","PeriodicalId":12545,"journal":{"name":"Geologica Carpathica","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139879878","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-01DOI: 10.31577/geolcarp.2023.28
Faezeh Safari, A. Yassaghi
Paleostress reconstruction through polyphase fault-slip data of a multi-deformed region suffered collisional tectonics can lead to detecting the stress phases. Based on earthquakes’ focal mechanisms and morphotectonic features, multiple deformation phases model has been proposed for the Alborz Mountains located in the collision zone between the Arabian (Central Iran) and Eurasian (South Caspian block) plates during the Late Cenozoic. In this study, paleostress analysis has been carried out in an area bounded by two (Kandovan and Taleghan) regional faults in the Central Alborz Mountains using fault-slip data. This analysis resulted in the identification of three main tectonic phases. The first, compressional phase is proposed to cause the inversion of the Alborz Mountains’ major initial normal faults to reverse faults during the convergence of the Arabian and Eurasian plates. The second, transpressional phase is offered as a factor for the reactivation of the hidden Alborz basement faults to form the NE-striking left-lateral strike-slip faults on the sedimentary cover. The third, transtensional phase is suggested to be responsible for the development of the NNE–SSW left-lateral transtensional faults. It is proposed that the second and third paleostress phases are affected mainly by the indentation of the South Caspian Block into the Alborz Mountains during the Late Cenozoic.
{"title":"Unravelling the tectonic phases: The impact of the South Caspian Block on Late Cenozoic deformation in the Central Alborz, Iran","authors":"Faezeh Safari, A. Yassaghi","doi":"10.31577/geolcarp.2023.28","DOIUrl":"https://doi.org/10.31577/geolcarp.2023.28","url":null,"abstract":"Paleostress reconstruction through polyphase fault-slip data of a multi-deformed region suffered collisional tectonics can lead to detecting the stress phases. Based on earthquakes’ focal mechanisms and morphotectonic features, multiple deformation phases model has been proposed for the Alborz Mountains located in the collision zone between the Arabian (Central Iran) and Eurasian (South Caspian block) plates during the Late Cenozoic. In this study, paleostress analysis has been carried out in an area bounded by two (Kandovan and Taleghan) regional faults in the Central Alborz Mountains using fault-slip data. This analysis resulted in the identification of three main tectonic phases. The first, compressional phase is proposed to cause the inversion of the Alborz Mountains’ major initial normal faults to reverse faults during the convergence of the Arabian and Eurasian plates. The second, transpressional phase is offered as a factor for the reactivation of the hidden Alborz basement faults to form the NE-striking left-lateral strike-slip faults on the sedimentary cover. The third, transtensional phase is suggested to be responsible for the development of the NNE–SSW left-lateral transtensional faults. It is proposed that the second and third paleostress phases are affected mainly by the indentation of the South Caspian Block into the Alborz Mountains during the Late Cenozoic.","PeriodicalId":12545,"journal":{"name":"Geologica Carpathica","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139685118","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-01DOI: 10.31577/geolcarp.2023.27
N. Bonev, P. Filipov
{"title":"Detrital zircon age constraints on low-grade sedimentary successions of the eastern Circum-Rhodope Belt, Bulgaria","authors":"N. Bonev, P. Filipov","doi":"10.31577/geolcarp.2023.27","DOIUrl":"https://doi.org/10.31577/geolcarp.2023.27","url":null,"abstract":"","PeriodicalId":12545,"journal":{"name":"Geologica Carpathica","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139881297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-01DOI: 10.31577/geolcarp.2023.26
Milica Mrdak, Eva Wagerer, M. Sudar, N. Djerić, Martin Đaković, H. Gawlick
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