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    Tytuł:
    Seismically induced soft-sediment deformation in crevasse-splay microdelta deposits (Middle Miocene, central Poland) - comment
    Autorzy:
    Loon, A. J. (Tom)
    Powiązania:
    https://bibliotekanauki.pl/articles/2058655.pdf
    Data publikacji:
    2019
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    soft-sediment deformation structures
    domino boudinage
    seismites
    Opis:
    The Miocene succession of crevasse-splay microdelta deposits in the Jóźwin IIB lignite opencast mine contains some aspects that are more interesting than Chomiak et al. (2019) seem to realize in their analysis of the sediments and the soft-sediment deformation structures that they contain. Moreover, the authors use a terminology that is not completely adequate, leaving some questions about the precise seismic process that induced the deformation structures. Both aspects are detailed in this comment. The interpretation of the deformation structures presented here may change the insight into the tectonic history of the graben, in which the study area is located.
    Źródło:
    Geological Quarterly; 2019, 63, 2; 424--428
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sedimentological distinction in glacigenic sediments between load casts induced by periglacial processes from those induced by seismic shocks
    Autorzy:
    Van Loon, Antonius Johannes
    Pisarska-Jamroży, Małgorzata
    Woronko, Barbara
    Powiązania:
    https://bibliotekanauki.pl/articles/2060257.pdf
    Data publikacji:
    2020
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    load casts
    pseudonodules
    soft-sediment deformation structures
    cryoturbation
    seismites
    Opis:
    Loading processes and the resulting load structures induced by processes related to periglacial conditions are compared to those induced by seismic shocks. The load structures themselves are relatively easily recognizable but the responsible trigger mechanism is, though depending on the geological context, commonly difficult to establish. Load structures like load casts, pseudonodules, ball-and-pillow structures and flame structures are commonly ascribed to instable density gradients within sediments and to differential loading, but their formation always requires liquefaction. In glacigenic sediments, deformation structures have most commonly been ascribed to periglacial processes (as a type of cryoturbations), but it becomes ever more clear that glacigenic sediments can, particularly during ice-front fluctuations, be affected by faulting-related earthquakes (due to glacio-isostatic adjustment), and the thus triggered seismic shocks may result in deformations, including - most commonly - load structures. We inventory the evidence that may help to distinguish, on the basis of textural and structural features, load structures with a seismic origin from those that result from periglacial processes, taking into account that truly diagnostic criteria do not exist.
    Źródło:
    Geological Quarterly; 2020, 64, 3; 626--640
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Record of earthquake phenomena in a Lower–Middle Triassic sedimentary basin (North Sudetic Synclinorium, Lower Silesia, SW Poland)
    Autorzy:
    Durkowski, Karol
    Powiązania:
    https://bibliotekanauki.pl/articles/2201203.pdf
    Data publikacji:
    2022
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    seismites
    tectonic activity
    brittle deformation
    soft sediment deformation structures
    boreholes
    Opis:
    Deposits of the Röt Formation (Lower–Middle Triassic) in the eastern part of the North-Sudetic Synclinorium (Bolesławiec Syncline), SW Poland, include numerous synsedimentary deformation structures. Six boreholes with a total core length of ~434 m enabled macroscopic analysis and description of these deformation structures, supplemented by borehole log interpretation, calcimetric analysis, and interpretation of 2D surface seismics. An interval up to ~42 m-thick at the base of the Röt Formation showed both brittle and soft-sediment deformation structures. Their abundance and intensity decrease towards the top of the Röt Formation, and they completely disappear in the Muschelkalk (Middle Triassic). Both the number of boreholes and their locations indicate the presence of such structures across the entire study area. The occurrence of deformation structures in each borehole analysed and their large lateral range suggest that the uppermost part of the Lower Triassic and lowermost part of the Middle Triassic in the study area were influenced by seismic activity. As a result, tectonic reorganization of the study area is inferred for the latest Early/earliest Middle Triassic.
    Źródło:
    Geological Quarterly; 2022, 66, 4; art. 66, no. 38
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Intrastratal flow in the Cretaceous Gyeokpori Formation (SW South Korea)
    Autorzy:
    Byun, Uk Hwan
    Van Loon, A.J. (Tom)
    Kwon, Yi Kyun
    Ko, Kyoungtae
    Powiązania:
    https://bibliotekanauki.pl/articles/2060260.pdf
    Data publikacji:
    2020
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    intrastratal flow
    Gyeokpori Formation
    soft-sediment deformation structures
    lacustrine environment
    Cretaceous
    Opis:
    Intrastratal flow is a process that is still poorly understood, rarely described and difficult to interpret in ancient rocks. Sediments in the Cretaceous lacustrine Gyeokpori Formation of southwestern South Korea contain some chaotically deformed sandstone layers with deformed mudstone clasts that are ascribed to this process. The interpretation is based on the fact that these layers cannot be explained as a result of subaqueous debris flows or mass transport, whereas the sedimentary context, including the presence of other soft-sediment deformation structures, indicates that intrastratal flow must have been physically possible. The sedimentary setting was a lake in which mainly siliciclastic rocks were deposited, with some interbedded volcaniclastics. The nearby volcanic activity caused seismic shocks that affected the unstable lake margins resulting in the dominance of gravity-flow deposits, but also in a high sedimentation rate that facilitated soft-sediment deformation partly caused by intrastratal flow. This must have happened fairly frequently during a probably limited time-span, as several layers showing traces of intrastratal flow are present within a succession of only <1 m thick. The combined data on the geological setting and our findings regarding the origin of the various soft-sediment deformation structures may help to recognize the traces left by intrastratal flow elsewhere in the geological record.
    Źródło:
    Geological Quarterly; 2020, 64, 3; 611--625
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    W jaki sposób badać sejsmity? Przegląd metod badawczych
    How to study seismites? A review of research methods
    Autorzy:
    Belzyt, Szymon
    Pisarska-Jamroży, Małgorzata
    Powiązania:
    https://bibliotekanauki.pl/articles/578355.pdf
    Data publikacji:
    2017
    Wydawca:
    Łódzkie Towarzystwo Naukowe
    Tematy:
    deformacje w osadach nieskonsolidowanych
    paleosejsmologia
    trzęsienia ziemi
    soft-sediment deformation structures
    palaeoseismology
    earthquakes
    Opis:
    Propagacja, wywołanej trzęsieniem ziemi, fali sejsmicznej w uwodnionych nieskonsolidowanych osadach drobnoziarnistych powodować może ich upłynnienie. W efekcie tego procesu powstać mogą warstwy zawierające struktury deformacyjne zwane sejsmitami. Zaproponowanie sejsmicznej genezy warstw zdeformowanych opiera się na zastosowaniu kryteriów rozpoznawczych. W tym celu konieczne jest: (1) przeprowadzenie analizy litofacjalnej osadów występujących w analizowanym profilu; (2) szczegółowe opisanie: deformacji, z uwzględnieniem ich rozmieszczenia w profilu i w obrębie zdeformowanej ławicy, rozciągłości poziomej, zróżnicowania przestrzennego, geometrii, tekstury i struktury osadów zaangażowanych w deformacje, osadów otaczających oraz zmiany rozkładu przestrzennego struktur deformacyjnych przy wykorzystaniu ścięcia poziomego i ukośnego; (3) wytypowanie struktur, które mogły powstać w efekcie upłynnienia i porównanie ich ze współcześnie tworzącymi się deformacjami związanymi ze wstrząsami sejsmicznymi; (4) rozpoznanie budowy geologicznej podłoża skalnego, w tym m.in. opis aktywności uskoków; (5) dyskusja innych mechanizmów, które mogły odpowiadać za powstanie deformacji; (6) określenie czasu powstania struktur deformacyjnych.
    Earthquake-triggered seismic wave propagation can induce liquefaction of water-saturated unconsolidated finegrained clastic sediments. As a result, layers with soft-sediment deformation structures called seismites can be formed. To propose a seismic origin of the layer, it should meet recognition criteria. Therefore, it is necessary to provide (1) a lithofacies analysis of the sediments in the studied section; (2) a detailed description of deformation structures including their position in the sedimentological log as well as within the deformed layer, lateral extent and continuity, geometry, texture and structure of both deformed and host sediments, spatial distribution and heterogenity of deformation structures in the plan view as well as an oblique view; (3) identification of structures that could have been formed during a liquefaction process and a comparison with those that recently occurred in tectonically active zones as an earthquake effect; (4) a subsurface geological structure recognition, particularly the presence and activity of faults; (5) discussion and elimination of all other possible triggers that could have caused sediment deformation; (6) estimation of the age of the deformation.
    Źródło:
    Acta Geographica Lodziensia; 2017, 106; 171-180
    0065-1249
    Pojawia się w:
    Acta Geographica Lodziensia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    First attempt to model numerically seismically-induced soft-sediment deformation structures : a comparison with field examples
    Autorzy:
    Bronikowska, Małgorzata
    Pisarska-Jamroży, Małgorzata
    Loon, van Tom
    Powiązania:
    https://bibliotekanauki.pl/articles/2058679.pdf
    Data publikacji:
    2021
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    numerical modelling
    seismic waves
    wave propagation
    seismites
    soft-sediment deformation structures
    load casts
    injection structures
    Opis:
    No numerical model has thus far addressed seismites, even though seismites are frequently used for the conditions which have to be fulfilled for the development of seismites have also been estimated only empirically. The present contribution is a first attempt to model numerically the soft-sediment deformation structures caused by the passage of S-waves through near-surface sedimentary layers. The simulations are based on the so-reconstruction of seismic events in the geological past. This is the more remarkable since the boundary called pressure tube model and the iSALE2D program. We modelled a seismic S-wave with six different vertical velocities, ranging from 1.6 to 2.6 m · s-1, passing through sediments with different densities and porosities in a sedimentary succession from the surface down to a depth of 10 m. The modelled soft-sediment deformation structures (load casts, flame structures, injection structures and sedimentary volcanoes) show similar geometries and sizes as those known from laboratory experiments and field studies. The geometry, size and type of these structures depend on the sediment properties and on the initial pressure used as a trigger mechanism, rather than on S-wave velocity. In contrast, the depth of the seismites appears to depend strongly on the S-wave velocity.
    Źródło:
    Geological Quarterly; 2021, 65, 4; s. 216--225
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Seismic and non-seismic soft-sediment deformation structures in the Proterozoic Bhander Limestone, central India
    Autorzy:
    Sarkar, S.
    Choudhuri, A.
    Banerjee, S.
    Van Loon, A. J.
    Bose, P. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/94668.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    seismites
    soft-sediment deformation structures
    basin subsidence
    Proterozoic
    India
    sejsmity
    struktury deformacji
    osady miękkie
    proterozoik
    Indie
    Opis:
    Numerous soft-sediment deformation structures occur within the Proterozoic Bhander Limestone of an intracratonic sag basin in a 750 m long section along the Thomas River, near Maihar, central India. Part of these deformation structures have most probably a non-seismic origin, but other structures are interpreted as resulting from earthquake-induced shocks. These seismic structures are concentrated in a 60 cm thick interval, which is interpreted as three stacked seismites. These three seismites are traceable over the entire length of the section. They divide the sedimentary succession in a lower part (including the seismites) deposited in a hypersaline lagoon, and an upper open-marine (shelf) part. Most of the soft-sediment deformations outside the seismite interval occur in a lagoonal intraclastic and muddy facies association. The SSDS within the seismite interval show a lateral continuity. They record simultaneous fluidisation and liquefaction. The bases of each of the three composing seismite bands are defined by small-scale shear folds, probably recording an earthquake and aftershocks. The presence of the three seismite bands at the boundary between the lagoonal and the overlying open-marine oolitic facies association suggests that the seismic event also triggered basin subsidence.
    Źródło:
    Geologos; 2014, 20, 2; 89-103
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Slumping as a record of regional tectonics and palaeoslope changes in the Satpura Basin, central India
    Autorzy:
    Khan, Merajuddin
    Khangar, Ranjit G.
    Raychowdhury, Nilasree
    Babhare, Anand T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1841629.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    soft-sediment deformation structures
    fold analysis
    refolding
    slump folds
    Talchir Formation
    struktury deformacji
    osady miękkie
    fałdowanie
    analiza fałd
    zapadlina
    Opis:
    Soft-sediment deformation structures play an important role in interpreting regional tectonics and basin evolution during slumping events. The Satpura Basin is interpreted as pull-apart with a monoclinal northerly palaeoslope throughout its evolution. The basin formed as a result of sinistral strike-slip faulting, induced by the ENE–WSW-trending Son-Narmada South fault in the north and the Tapti North fault in the south. We have analysed the slump folds within the basalmost Talchir Formation and related these to regional tectonics and palaeoslope changes in the Satpura Basin. The glaciofluvial strata of the Talchir Formation, exposed in the southern part of the Satpura Basin, record intricacies of folds created during slumping. Several fold styles can be distinguished, within alternations of competent sandstone and incompetent shale layers, some of which indicate buckling. Upright folds, resulting from pure shear, underwent rotation of their axial planes and fold axes during simple shear-dominated progressive deformation when the slump moved downslope. The soft-sediment deformation structures that we have studied show refolding patterns that closely resemble comparable folds known from lithified rocks. These layers with refolded structures are overlain by undeformed sediments, which proves that they are the product of a single ongoing slumping process, rather than of successive deformation events. Our analysis of their fold axes and axial planes, together with fold vergences and thrust directions within the slumps, suggests a mean slumping direction towards the southwest. Analyses of slump folds and their relationship with regional tectonics have allowed us to reinterpret basin evolution history. The southwesterly trending palaeoslope of the basin suggest that the slope of the basin was not uniform throughout its evolution. At the opening, the oblique slip fault, which trended NE–SW, generated due to movement along the ENE–WSW basin bounding faults, was more active and triggered slumping event within the Talchir deposits in the basin. With progressive overlapping of the basin-bounding faults, the Satpura Basin gradually tilted towards the north.
    Źródło:
    Geologos; 2021, 27, 2; 93-103
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Seismogenic structures in Quaternary lacustrine deposits of Lake Van (eastern Turkey)
    Autorzy:
    Üner, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/94716.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    seismites
    soft-sediment deformation structures
    earthquake
    Lake Van
    Turkey
    sejsmity
    struktury deformacji
    osady miękkie
    trzęsienie ziemi
    jezioro Wan
    Turcja
    Opis:
    Soft-sediment deformation structures formed by liquefaction and/or fluidisation of unconsolidated sediments due to seismic shocks are frequent in the Quaternary sandy, silty and clayey deposits of Lake Van. They are present in both marginal and deep lacustrine facies. Their morphology and interpreted genesis imply that they should be considered as fluid-escape structures (dish and pillar structures, flame structures and sand volcanoes), contorted structures (simple and complex convolutions and ball-and-pillow structures) and other structures (disturbed layers and slump structures). The most recently formed structures are related to the October 23rd, 2011 Van-Tabanlı (Mw 7.2) earthquake. The exist-ence of seismites at various stratigraphic levels in the lacustrine deposits is indicative of tectonic activity that frequently triggered earthquakes with magnitudes of 5 or more, affecting the Lake Van Basin.
    Źródło:
    Geologos; 2014, 20, 2; 79-87
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Late Pleistocene-Holocene earthquake-induced slumps and soft-sediment deformation structures in the Acequion River valley, Central Precordillera, Argentina
    Autorzy:
    Perucca, L. P.
    Godoy, E.
    Pantano, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/94322.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    lacustrine sedimentation
    liquefaction
    seismites
    slump
    soft-sediment deformation structures
    palaeo-earthquake
    sedymentacja jeziorna
    upłynnienie
    sejsmity
    pogrąz
    struktury deformacji
    osady miękkie
    Opis:
    Evidence of earthquake-induced liquefaction features in the Acequión river valley, central western Argentina, is analysed. Well-preserved soft-sediment deformation structures are present in Late Pleistocene deposits; they include two large slumps and several sand dikes, convolutions, pseudonodules, faults, dish structures and diapirs in the basal part of a shallow-lacustrine succession in the El Acequión River area. The water-saturated state of these sediments favoured deformation. All structures were studied in a natural trench created as a result of erosion by a tributary of the Acequión River, called El Mono Creek. They form part of a large-scale slump system. Two slumps occur in the western portion of the trench and must have moved towards the ENE (70°), where the depocentre of the Boca del Acequión area is situated. Considering the spatial relationship with Quaternary faults, the slumps are interpreted as being due to a seismic event. The thickest dikes in the El Mono Creek trench occur in the eastern portion of the trench, indicating that the responsible earthquake was located to the east of the study area, probably at the Cerro Salinas fault system zone. The slumps, sand dikes and other soft-sediment deformation features are interpreted as having been triggered by earthquakes, thus providing a preliminary palaeoseismic record of the Cerro Salinas fault system and extending the record of moderate- to high-magnitude earthquakes in central western Argentina to the Late Pleistocene.
    Źródło:
    Geologos; 2014, 20, 2; 147-156
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Soft-sediment deformation structures in seismically affected deep-sea Miocene turbidites (Cilento Basin, southern Italy)
    Autorzy:
    Valente, A.
    Ślączka, A.
    Cavuoto, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/94582.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    high-density turbidites
    soft-sediment deformation structures
    seismites
    Apennines
    Cilento Group
    miocene
    Italy
    turbidyty
    struktury deformacji
    sejsmity
    Apeniny
    miocen
    Włochy
    Opis:
    Soft-sediment deformation structures (SSDS) are widespread in the upper part of the S. Mauro Formation (Cilento Group, Middle-Late Miocene). The succession is represented mainly by thick and very thick, massive, coarse-grained sandstones, deposited by rapid sedimentation of high-density turbidity currents. The most common SSDS are short pillars, dishes, sedimentary sills and convolutions. They occur mostly in the upper parts of sandstone beds. Vertical tubes of 4–5 cm in diameter and up to 50 cm long constitute the most striking structures. They begin in the middle part of sandstone beds, which are basically massive or contain faint dish structures. These tubes can bifurcate upwards and/ or pass into bedding-parallel veins or dikes. The vertical tubes sometimes form sand volcanoes on the then sedimentary surface. The SSDS are interpreted as the result of earthquake-triggered liquefaction and/or fluidisation of the turbidites that were affected by the seismic shocks. This implies that the deformed layers should be considered as seismites.
    Źródło:
    Geologos; 2014, 20, 2; 67-78
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Palaeo-earthquake events during the late Early Palaeozoic in the central Tarim Basin (NW China): evidence from deep drilling cores
    Autorzy:
    He, B.
    Qiao, X.
    Jiao, C.
    Xu, Z.
    Cai, Z.
    Guo, X.
    Zhang, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/94300.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    soft-sediment deformation structures
    seismites
    palaeo-seismicity
    Late Ordovician
    Silurian
    Tazhong 1 Fault
    Tarim Basin
    struktury deformacji
    osady miękkie
    sejsmity
    ordowik późny
    sylur
    Kotlina Kaszgarska
    Opis:
    Various millimetre-, centimetre- and metre-scale soft-sediment deformation structures (SSDS) have been identified in the Upper Ordovician and Lower-Middle Silurian from deep drilling cores in the Tarim Basin (NW China). These structures include liquefied-sand veins, liquefaction-induced breccias, boudinage-like structures, load and diapir- or flame-like structures, dish and mixed-layer structures, hydroplastic convolutions and seismic unconformities. The deformed layers are intercalated by undeformed layers of varying thicknesses that are petrologically and sedimentologically similar to the deformed layers. The SSDS developed in a shelf environment during the early Late Ordovician and formed initially under shear tensile stress conditions, as indicated by boudinage-like structures; during the latest Ordovician, SSDS formed under a compressional regime. The SSDS in the Lower-Middle Silurian consist mainly of mixed layers and sand veins; they formed in shoreline and tidal-flat settings with liquefaction features indicating an origin under a compressional stress regime. By Silurian times, the centre of tectonic activity had shifted to the south-eastern part of the basin. The SSDS occur at different depths in wells that are close to the syn-sedimentary Tazhong 1 Fault (TZ1F) and associated reversed-thrust secondary faults. Based on their characteristics, the inferred formation mechanism and the spatial association with faults, the SSDS are interpreted as seismites. The Tazhong 1 fault was a seismogenic fault during the later Ordovician, whereas the reversed-direction secondary faults became active in the Early-Middle Silurian. Multiple palaeo-earthquake records reflect pulses and cyclicity, which supports secondary tectonic activity within the main tectonic movement. The range of SSDS structures reflects different developments of tectonic activity with time for the various tectonic units of the centralbasin. The effects of the strong palaeo-earthquake activity coincide with uplift, fault activity and syn-tectonic sedimentation in the study area during the Late Ordovician to Middle Silurian.
    Źródło:
    Geologos; 2014, 20, 2; 105-123
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Soft-sediment deformation structures in cores from lacustrine slurry deposits of the Late Triassic Yanchang Fm. (central China)
    Autorzy:
    Yang, R.
    van Loon, A. J.
    Yin, W.
    Fan, A.
    Han, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/94445.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    soft-sediment deformation structures
    low-density gravity-flow deposits
    Triassic
    lacustrine sediments
    Ordos basin
    China
    struktury deformacji
    osady miękkie
    złoża grawitacyjne o niskiej gęstości
    trias
    osady jeziorne
    zlewnia
    Ordos
    Chiny
    Opis:
    The fine-grained autochthonous sedimentation in the deep part of a Late Triassic lake was frequently interrupted by gravity-induced mass flows. Some of these mass flows were so rich in water that they must have represented slurries. This can be deduced from the soft-sediment deformation structures that abound in cores from these lacustrine deposits which constitute the Yanchang Fm., which is present in the Ordos Basin (central China). The flows and the resulting SSDS were probably triggered by earthquakes, volcanic eruptions, shear stress of gravity flows, and/or the sudden release of overburden-induced excess pore-fluid pressure. The tectonically active setting, the depositional slope and the high sedimentation rate facilitated the development of soft-sediment deformations, which consist mainly of load casts and associated structures such as pseudonodules and flame structures. Sediments with such deformations were occasionally eroded by slurries and became embedded in their deposits.
    Źródło:
    Geologos; 2016, 22, 3; 201-211
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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