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    Wyświetlanie 1-13 z 13
    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:
    Reflections on subglacial megafloods: their possible cause, occurrence, and consequence for the global climate
    Autorzy:
    Loon, A. J. (Tom)
    Powiązania:
    https://bibliotekanauki.pl/articles/94340.pdf
    Data publikacji:
    2009
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    jökulhlaup
    megafloods
    Heinrich events
    sliding layer
    subglacial lakes
    climate change
    powódź glacjalna
    warstwa poślizgowa
    jezioro podlodowcowe
    zmiany klimatu
    Opis:
    Huge water reservoirs exist subglacially, for instance in the form of lakes. Failure of a wall around such a lake underneath the central part of a large ice mass may result in huge water outbursts. The resulting megafloods will rarely be traceable along the ice front, because much power is lost by friction and because the flood spreads subglacially over a large area. Truly giant meltwater outbursts might, however, still have an enormous power when reaching the marginal area of an ice cap. Such a megaflood may both affect the integrity of the ice mass, and help create a sliding layer over which huge ice masses can be easily transported towards the ocean, thus triggering a Heinrich-like event. This would have great impact on the global climate. Some of the Heinrich events that occurred during the past hundreds of thousands of years may well have been due to giant subglacial water outbursts, and such a situation may equally well occur in the time to come.
    Źródło:
    Geologos; 2009, 15, 2; 115-128
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Possible pitfalls in the procedure for paleobiodiversity-dynamics analysis
    Pułapki analizy paleo-bioróżnorodności
    Autorzy:
    Ruban, Dmitry A.
    Loon, A. J. (Tom)
    Powiązania:
    https://bibliotekanauki.pl/articles/94348.pdf
    Data publikacji:
    2008
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    biodiversity
    taxonomy
    biostratigraphy
    geochronology
    Lazarus taxa
    bioróżnorodność
    taksonomia
    biostratygrafia
    geochronologia
    taksony Łazarza
    Opis:
    The changes in the diversity of specific taxa during certain parts of the geological past (paleobiodiversity dynamics) can, in principle, be established by counting the number of the fossil taxa present (worldwide or in a specific study area) in rocks dated for the time interval under study. Numerous obstacles are present, however, for instance in the form of lacking field data, disappeared collections, ambiguous identifications, temporary ‘disappearence’ of taxa, and dating problems. One major problem is the fact that, particularly in regional studies in some countries, a local, regional or national chronostratigraphic terminology is used rather than the chronostratigraphy recommended by the International Stratigraphic Commision of the International Union of Geological Sciences. This hampers international correlation and makes precise global paleodiversity-dynamics analyses extremely difficult. A reliable insight into the true paleodiversity dynamics requires not only that the various problems are recognized, but also that their consequences are eliminated or, if this is impossible, minimized. This is particularly important if the effects of mass extinctions on fauna and flora are investigated. Each analysis of paleobiodiversity-dynamics analysis of phenomena related to mass extinctions should therefore try to quantify the impact that missing data or inaccuracies of any kind may have on the final results; such an analysis should, in addition, try to find a solution for the major problems, so as to avoid significant inaccuracies of the calculated values. Large electronic databases can help, since about a decade, to diminish possible errors in diversity estimates. Paleobiodiversity should preferably be expressed in the form of values with a certain band with, indicating the inaccuracy, rather than in the form of exact values.
    Zmiany w zróżnicowaniu gatunków w pewnych przedziałach czasu przeszłości geologicznej (dynamika paleo-bioróżnorodności) są z zasady ustalane poprzez zliczanie liczby taksonów skamieniałości (na świecie lub na wybranym obszarze) w skałach datowanych na badany interwał czasowy. Tym niemniej procedura ta napotyka wiele przeszkód, np. w postaci braku danych z jakiegoś obszaru, zagubionych kolekcji, niejednoznacznych identyfikacji, czasowego „zaniku” taksonów czy problemów datowania. Jednym z głównych problemów, zwłaszcza w badaniach regionalnych w niektórych krajach, jest stosowanie lokalnej, regionalnej lub krajowej terminologii chronostratygraficznej, a nie chronostratygrafii rekomendowanej przez Międzynarodową Komisję Stratygraficzną przy Międzynarodowej Unii Nauk Geologicznych. Utrudnia to międzynarodowe korelacje i czyni niezwykle trudnym przeprowadzenie precyzyjnej globalnej analizy dynamiki paleo-bioróżnorodności. Wiarygodny wgląd w prawdziwą dynamikę paleo-bioróżnorodności wymaga nie tylko rozpoznania różnych problemów, ale również wyeliminowania ich konsekwencji, a gdy to niemożliwe, zminimalizowania ich. Jest to szczególnie ważne w przypadku, gdy badane są następstwa masowego wymierania fauny i flory. Dlatego każda analiza dynamiki paleo-bioróżnorodności zjawisk związanych z masowym wymieraniem powinna zawierać próbę ilościowego oszacowania wpływu, jakie brakujące dane lub niedokładności jakiegokolwiek rodzaju mogą wywierać na końcowe wnioski. Taka analiza powinna próbować znaleźć rozwiązanie dla głównych problemów, ażeby uniknąć znaczących niedokładności w obliczonych wartościach. Duże elektroniczne bazy danych, dostępne od około 10 lat, mogą pomóc w zmniejszeniu możliwych błędów przy szacowaniu różnorodności. Najlepiej, gdyby paleo-bioróżnorodność była wyrażana w formie wartości w pewnym zakresie, wskazującym na niedokładność, a nie w formie precyzyjnej wartości.
    Źródło:
    Geologos; 2008, 14, 1; 37-50
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Slide origin of breccia lenses in the Cambrian of the North China Platform: new insight into mass transport in an epeiric sea
    Autorzy:
    Van, Loon A. J. (Tom)
    Han, Zuozhen
    Han, Yu
    Powiązania:
    https://bibliotekanauki.pl/articles/94404.pdf
    Data publikacji:
    2012
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    breccia lenses
    sliding
    epeiric sea
    Chaomidian Formation
    Furongian
    North China Platform
    poślizg
    morze epikontynentalne
    formacja Chaomidian
    Furong
    platforma północnokoreańska
    Opis:
    An oolite in the Furongian (Late Cambrian) Chaomidian Formation in Shandong Province, China, which was deposited on the North China Platform in an epeiric sea, contains several limestone breccia lenses of various dimensions (centimetres to decimetres thick and decimetres to more than 10 metres in length) in an E-trending section. The oolite, which is approximately 40 cm thick, was originally thicker, as indicated by a planar truncation surface that formed by wave abrasion. The breccia lenses in this oolite are generally mound-shaped with a flat base and a convex top. The western margin of the lenses is commonly rounded whereas the eastern margin commonly has a tail (consisting of a rapidly eastwards thinning breccia horizon that gradually ends in a horizon of isolated clasts). Some of the breccia lenses are underlain by a shear zone. The formation of the breccia lenses cannot be easily explained by normal depositional or deformational processes. It is concluded that the lenses represent fragments of a partly consolidated layer, consisting of both rounded and angular platy clasts, which slid down over a very gently inclined sedimentary surface which acted - possibly together with a water film - as a lubricant layer. During transport, the layer broke up into several discrete bodies that formed small ‘highs’ at the sedimentary surface of the shallow epeiric sea. Subsequently, waves partially eroded the lenses, mostly at their margins, producing their mound-shaped form. Sliding of blocks is known from a wide variety of environments in the sedimentary record; however, this is the first description of the sliding of blocks in an epeiric sea. This indicates that such a low-relief submarine carbonate setting is, like its siliciclastic counterparts, susceptible to this process.
    Źródło:
    Geologos; 2012, 18, 4; 223-235
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interaction between turbidity currents and a contour current – a rare example from the Ordovician of Shaanxi province, China
    Autorzy:
    Li, Hua
    van Loon, A. J. (Tom)
    He, Youbin
    Powiązania:
    https://bibliotekanauki.pl/articles/950462.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    contourites
    turbidites
    reworking
    Ordos basin
    Pingliang formation
    kontury
    turbidyty
    przeróbka
    zlewnia
    Ordos
    Pingliang
    Opis:
    The silty top parts of graded turbidites of the Late Ordovician Pingliang Formation, which accumulated along the southern margin of the Ordos Basin (central China), have been reworked by contour currents. The reworking of the turbidites can be proven on the basis of paleocurrent directions in individual layers: the ripple-cross-bedded sandy divisions of some turbidites show transport directions consistently into the downslope direction (consistent with the direction of other gravity flows), but in the upper, silty fine-grained division they show another direction, viz. alongslope (consistent with the direction that a contour current must have taken at the same time). Both directions are roughly perpendicular to each other. Moreover, the sediment of the reworked turbidites is better sorted and has better rounded grains than the non-reworked turbidites. Although such type of reworking is well known from modern deep-sea environments, this has rarely been found before in ancient deep-sea deposits. The reworking could take place because the upper divisions of the turbidites involved are silty and consequently relatively easily erodible, while the contour current had locally a relatively high velocity – and consequently a relatively large erosional capability – because of confinement within a relatively narrow trough.
    Źródło:
    Geologos; 2019, 25, 1; 15-30
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sedimentary environment and palaeogeography of the ?Palaeocene-Middle Eocene Kashkan Formation, Zagros fold-thrust belt, SW Iran
    Autorzy:
    Yeganeh, Bizhan Yousefi
    Feiznia, Sadat
    Loon, A. J. (Tom)
    Powiązania:
    https://bibliotekanauki.pl/articles/94687.pdf
    Data publikacji:
    2012
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    Kashkan Formation
    Zagros fold-thrust belt
    trace fossils
    facies architecture
    braided river
    shoreface
    Palaeocene
    Eocene
    Iran
    skamieniałości śladowe
    rzeka roztokowa
    powierzchnia brzegowa
    Palaeocen
    Eocen
    Opis:
    The Kashkan Formation (?Palaeocene to Middle Eocene) in the Zagros fold-thrust belt, SW Iran, which is intercalated between to marine limestone formations, consists of conglomerates, sandstones and siltstones. The sedimentology and the palaeogeography of the Kashkan Formation had not received any attention thus far, but have now been studied in seven sections, situated in the province of Lorestan. The sediments form twelve lithofacies, three ichnosubfacies and seven architectural elements, which are described, depicted and analysed. The analysis leads to the conclusion that most sediments accumulated in a low-sinuosity, low-gradient braided-river system (characterised by mainly unidirectional palaeocurrent directions, and by sheetfloods), that occasionally showed meandering characteristics (represented by overbank deposits and large bars). The deposits of this system closely resemble those of the South Saskatchewan River in Canada, which is considered as the classical example of a sand-bed braided river. The river flowed roughly from North to South, as deduced by palaeocurrent indicators such as imbrication and large- to medium-scale trough cross-stratification (direction measured in the trough axes). This current direction is supported by the southward to south-westward thinning of the formation and by the diminishing average grain size in the same direction. The trace fossils in the Kashban Formation fit all in the Skoyenia ichnofacies, which has here three ichnosubfacies which allow a more detailed palaeoenvironmental reconstruction, indicating that the braided stream passed into the low-energy shoreface zone of a tidally-influenced sea.
    Źródło:
    Geologos; 2012, 18, 1; 13-36
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The challenge of reconstructing the Phanerozoic sea level and the Pacific Basin tectonics
    Autorzy:
    Ruban, Dmitry A.
    Conrad, Clinton P.
    Loon, A. J. (Tom)
    Powiązania:
    https://bibliotekanauki.pl/articles/94614.pdf
    Data publikacji:
    2010
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    sea-floor bathymetry
    dynamic topography
    sea-level changes
    plate tectonics
    Pacific
    Panthalassa
    Phanerozoic
    batymetria dna morskiego
    dynamiczna topografia
    zmiany poziomu morza
    płyty tektoniczne
    Pacyfik
    Opis:
    The relationships between the interior dynamics of our planet and global sea level can be unravelled when plate-tectonic reconstructions are available for the entire Earth. A review of global tectonics reveals significant deficiencies in our understanding of the geodynamic evolution of the Pacific (Panthalassa or Proto-Pacific) during the Cambrian-Jurassic time-span. This particular, but major, shortcoming presents a true challenge for modern geoscientists, who are encouraged to produce a detailed plate-tectonic reconstruction of the Pacific for the pre-Cretaceous in order to advance our understanding of Phanerozoic sea-level change. A set of approaches, including geological/geophysical modelling, investigation of accretionary prisms, palaeobiogeographical studies, and careful examination of eustatic sea-level changes, are proposed that will help geoscientists tackle the challenge of understanding how Pacific geodynamics affected global sea level during the Phanerozoic.
    Źródło:
    Geologos; 2010, 16, 4; 235-243
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    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:
    A new type of slumping-induced soft-sediment deformation structure: the envelope structure
    Autorzy:
    Byun, Uk Hwan
    van Loon, A. J. (Tom)
    Kwon, Yi Kyun
    Ko, Kyoungtae
    Powiązania:
    https://bibliotekanauki.pl/articles/950457.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    Gyeokpori Formation
    Cretaceous
    lacustrine environment
    slumping
    conglomerate
    kreda
    środowisko jeziorne
    opadanie
    konglomerat
    Opis:
    The sediments of the Cretaceous Gyeokpori Formation in south-western South Korea accumulated in a lake in which mainly siliciclastic rocks were deposited, with some interbedded volcaniclastics. The nearby volcanic activity resulted in unstable lake margins inducing a dominance of gravity-flow deposits. The high sedimentation rate facilitated soft-sediment deformation on the sloping margin. The deposition of numerous gravity-flow deposits resulted in a vertically heterolithic stratification. The slumps are composed of different lithologies, which is expressed in different types of deformation due to the difference in cohesion between sandy and mussy layers within the slumps. Coarser-grained (cohesionless) slumps tend to show more chaotic deformation of their lamination or layering. The difference in slumping behaviour of the cohesive and non-cohesive examples is explained and modelled. A unique soft-sediment deformation structure is recognized. This structure has not been described before, and we call it ‘envelope structure’. It consists of a conglomerate mass that has become entirely embedded in fine-grained sediment because slope failure took place and the fine-grained material slumped down with the conglomerate ‘at its back’. The cohesive laminated mudstone formed locally slump folds that embedded the non-cohesive overlying conglomerate unit, possibly partly due to the bulldozing effect of the latter. This structure presumably can develop when the density contrast with the underlying and overlying deposits is exceptionally high. The envelope structure should be regarded as a special – and rare – type of a slumping-induced deformation structure.
    Źródło:
    Geologos; 2019, 25, 2; 111-124
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Glacial Terminations II and I as recorded in NE Iceland
    Autorzy:
    Vliet-Lanoë, Brigitte
    Guðmundsson, Agust
    Guillou, Hervé
    Guégan, Soléne
    Loon, A. J. (Tom)
    Vleeschouwer, François
    Powiązania:
    https://bibliotekanauki.pl/articles/94567.pdf
    Data publikacji:
    2010
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    ice-stream patterns
    palaeolake
    deglaciation
    Last Glacial Maximum
    mid-Eemian cooling
    Iceland
    paleojezioro
    deglacjacja
    ostatnie zlodowacenie
    Islandia
    Opis:
    Volcanism in eastern Iceland has controlled the changes in glacier- and river-drainage patterns and the sedimentary budget, particularly during the Middle and Late Pleistocene. The glacial extent in NE Iceland appears to be related to the impact of volcanic activity, not only on the ice-stream dynamics, but also on the sedimentary successions. Analysis of the Jökuldalur and Jökulsa á Brù records results in a new interpretation of the changes in ice extent and flow direction for at least the last two glaciations. From MIS 8 onward, the development of the Snæfell volcano apparently forced the ice stream that derived from the Vatnajökull ice cap to take another course; it also affected the offshore sedimentary budgets at the new outlet at Vopnafjördur. The MIS 6 ice sheet was thick and extensive, and associated with an ice-stream diversion to the North. The thick sedimentary complex of palaeolake Halslón was formed close to an outlet of the Vatnajökull, the Brùarjökull, during Termination II and a part of the MIS 5e interglacial. The deposits formed during MIS 5e record two climate optima interrupted by two successive glacial advances correlated with the mid-Eemian cooling. The deposits of the Weichselian deglaciation (Termination I) are much more limited in thickness. During the Last Glacial Maximum and the Late Glacial, glaciers also seem to have been restricted in the Jökulsa á Brù area. Valley glaciers issued from the Brùarjökull re-advanced several times in the Jökuldalur only during at least the Older Dryas, the Younger Dryas and the Preboreal. NE Iceland has undergone considerable deglaciation since the Bølling. In contrast to the conclusions of previous studies, the results presented here are consistent with data on the glaciations in other Nordic regions and can increase the understanding of the mid-Eemian cooling.
    Źródło:
    Geologos; 2010, 16, 4; 201-222
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Slope failure on a Cambrian carbonate platform, mass-flow transitions and resulting complex deposit
    Autorzy:
    Wang, Zhaopeng
    Liu, Jiaye
    Van Loon, A. J. (Tom)
    Zhu, Decheng
    Qin, Peng
    Han, Zuozhen
    Powiązania:
    https://bibliotekanauki.pl/articles/2058558.pdf
    Data publikacji:
    2020
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Gushan Formation
    Middle Cambrian
    epeiric sea
    carbonate platform
    mass-flow transitions
    Opis:
    The quiet environment of the carbonate platform in the epeiric sea that existed during the Cambrian between present-day China and Korea was occasionally affected by processes that have hitherto not been described from such a setting. A conglomerate was found in the Middle Cambrian Gushan Formation near Chengouwan (Shandong Province, E China), eroded into the underlying sediments. The conglomerate is explained as a deposit consisting of material that was eroded up-slope when slope-failure took place, resulting in a slump that passed into a high-density debris flow with erosive power that passed, in turn, again into a slump. The slump came to rest when it lost its momentum on a less inclined part of the basin slope. Immediately after deposition, fluidization occurred in the lower part of the slump deposit, as proven by a funnel-shaped water-escape structure and a lateral injection of some metres long of brecciated material.
    Źródło:
    Geological Quarterly; 2020, 64, 1; 3--15
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Depositional environment of the Bagh-e-Vang Formation – the only occurrence of upper Lower Permian in Iran
    Autorzy:
    Yegane, Bizhan Yousefi
    Van Loon, A.J. (Tom)
    Fard, Sakine Arefi
    Farahpour, Mohammad Mehdi
    Sharahi, Safoora Yasbolaghi
    Powiązania:
    https://bibliotekanauki.pl/articles/1841615.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    limestones
    microfacies analysis
    transgression conglomerate
    barrier deposits
    lagoonal environment
    Tabas Block
    wapienie
    analiza mikrofacjalna
    konglomerat
    transgresja
    osady
    laguna
    Opis:
    A transgression of the Tethys Ocean occurred in east central Iran, like in other areas of the Tethys Ocean, around the Yakhtashian/Bolorian (regional chronostratigraphical units corresponding with the Artinskian/Kungurian of the Early Permian) transition. This led to the development of a carbonate platform that is represented in the Shirgesht area on the northern part of the Tabas Block by the Bagh-e-Vang Formation, which constitutes the only known sedimentary unit from the late Early Permian in Iran. Field data and thin-section analysis indicate deposition on a carbonate ramp with barriers separating a lagoonal area with intertidal mud flats from the open-marine environment. The overall transgres-sive development is indicated by the presence of open-marine sediments on top of the barrier and lagoonal sediments.
    Źródło:
    Geologos; 2021, 27, 1; 1-14
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Engineering-geological and geotechnical investigations for risk assessment of the University Olympic Village in Izmir (Turkey)
    Autorzy:
    Kıncal, Cem
    Koca, Mehmet Yalçın
    Yılmaz, H. Recep
    Akgün, Mustafa
    Özyalın, Şenol
    Eskişar, Tuğba
    Akçığ, Zafer
    Loon, A. J. (Tom)
    Powiązania:
    https://bibliotekanauki.pl/articles/94556.pdf
    Data publikacji:
    2010
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    engineering geology
    hazard maps
    bearing capacity
    Izmir
    Turkey
    geologia inżynierska
    mapy zagrożenia
    nośność statyczna
    Turcja
    Opis:
    The Metropolitan Municipality of Izmir (Turkey) designated a steeply inclined area for the construction of buildings to house the participants of the Izmir University Olympic Games. Before the construction activities could start, engineering geological and geotechnical investigations had to be carried out in order to establish which zones in the area were suitable for safe constructions. Seismic studies, borings and laboratory tests yielded the data, which were used for preparing five hazard maps in a GIS environment. The construction activities based on the results of this complex investigation appeared successful. The engineering geological investigations included geotechnical measurements on core samples obtained from the boreholes (core drilling) and laboratory testing. The rock-quality designation (RQD%) values of the rock units were determined and used in the rock-mass classification (rock-mass rating method) as an in-put parameter and in the calculation of the bearing capacity of the various rock units. Geophysical surveys were carried out to determine the seismic velocity of the rocks at the site. A short overview is provided of the main problems that had to be dealt with, and of the successive steps taken to solve the engineering-geological problems. Determination of these problems is necessary for adequate land-use planning and construction activities.
    Źródło:
    Geologos; 2010, 16, 1; 43-57
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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