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    Wyświetlanie 1-11 z 11
    Tytuł:
    Mesozoic remagnetization of Upper Devonian carbonates from the Česis and Skaistgirys quarries (Baltic states)
    Autorzy:
    Katinas, V.
    Nawrocki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2058838.pdf
    Data publikacji:
    2004
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Lithuania
    Latvia
    Devonian
    palaeomagnetism
    remagnetisation
    dolomites
    Opis:
    The palaeomagnetic properties of Frasnian and Famennian dolomites from two quarries in Latvia and Lithuania respectively are compared. Famennian dolomites from Skaistgirys quarry (N Lithuania) revealed the presence of one distinct normal polarity component (D =14 degrees Celsius, I = 53 degrees Celsius, 95 = 4.2 degrees Celsius, n = 28 specimens). The reversed polarity component predominates in Frasnian dolomites from Česis quarry (Central Latvia). Only one hand specimen from this locality contained a component with the opposite direction. The mean direction from Česis quarry (D = 198 degrees Celsius, I = -53 degrees Celsius, 95 = 4.4 degrees Celsius, n = 22 specimens) is very close to that from Skaistgirys quarry and therefore was recorded most probably during the same event of remagnetisation but at a later stage. The remagnetizations of these dolomites were caused most probably by progressive oxidation of ferric sulphides to magnetite and finaly to hematite. A comparison of the palaeomagnetic poles obtained with the stable European APWP (Apparent Polar Wander Path) indicates a Late Jurassic/Early Cretaceous age for the remagnetization event. This estimation can be useful for chronostratigraphic linking of post-Palaeozoic tectonic activity and diagenetic events, so far very poorly recognized in this part of the European plate. Our data shows also that the Late Jurassic/Early Cretaceous part of the stable European APWP may still be inaccurate.
    Źródło:
    Geological Quarterly; 2004, 48, 3; 293-298
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Palaeomagnetic age of remagnetizations in Silurian dolomites, Rástla quarry (Central Estonia)
    Autorzy:
    Plado, J.
    Preeden, U.
    Puura, V.
    Pesonen, L. J.
    Kirsimäe, K.
    Pani, T.
    Elbra, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060209.pdf
    Data publikacji:
    2008
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Estonia
    Baltica
    Silurian
    palaeomagnetism
    remagnetization
    dolomites
    Opis:
    Alternating field and thermal demagnetization of dolomite samples from the Silurian (Llandovery) horizontally-bedded sequence of central Estonia reveal two secondary magnetization components (A and B) both of chemical origin. A low-coercivity (demagnetized at -50 mT) component A (D = 60.7°, I = 7.7°, alfa95 = 16.6°) with high dispersion (k = 14.2), yields a palaeopole at 18.2°N and 139.5°E that points towards the Late Devonian — Mississipian segment of the Baltica APWP (Apparent Polar WanderPath). A high-coercivity component B (D = 13.5°, I = 60.7°, k = 67.0, alfa 95 = 4.7°) carries both normal and reversed polarities. Comparing the palaeopole (71.1°N and 173.3°E) with the European APWP reveals a Cretaceous age. These two remagnetizations are linked to mineral assemblages of magnetite and maghemite (A), and hematite (B) determined from mineralogical (X-ray, SEM and optical microscopy) and rock magnetic (acquisition and thermal demagnetization of a 3-component IRM; Lowrie-test) studies. The results suggest that the first (A) Palaeozoic remagnetization was caused by low-temperature hydrothermal circulation due to the influence of the Caledonian (more likely) or Hercynian Orogeny after the diagenetic dolomitization of carbon ates. Hematite, carrying the component B, and goethite, are the latest ferromagnetic minerals that have precipitated into the existing pore space (hematite) and walls of microscopic fractures (goethite) that opened to allow ac cess for oxygen-rich fluids during the Late Mesozoic.
    Źródło:
    Geological Quarterly; 2008, 52, 3; 213-213
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Casts of halite crystals in the Devonian dolomites of the Zachełmie Quarry
    Ślady po kryształach halitu w dolomitach dewońskich w kamieniołomie Zachełmie
    Autorzy:
    Jaworska, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2192095.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Stowarzyszenie Górnictwa Solnego
    Tematy:
    halit
    ślady
    dolomity
    dewon
    Zachełmie
    halite
    casts
    dolomites
    Devonian
    Opis:
    The abandoned Zachełmie Quarry has been known for the discovery and descriptions of the trackways of a tetrapod, the oldest land vertebrate animal. Three well-preserved casts of single halite crystals were found on two salt samples collected from the same site. The sizes of the halite traces range from 1 to ca. 2.5-3 cm. Most certainly, they are two casts of hopper and one of cube form crystals. The local dolomite formations, studied and described several times in detail, indicate that a shallow and vast lagoon that had uncovered the sea bottom several times and periodically allowed for the sedimentation of evaporites was the sedimentation environment. In this paper, the author considers possible place and time of halite crystallisation, i.e. whether the crystals were precipitated from the basin’s solution or somewhat later, as a result of brine penetration through the carbonate sediment. Either halite “location” and precipitation time seem to be equally probable.
    Nieczynny kamieniołom w Zachełmiu jest znany z racji odkrycia i opisu śladów najstarszego lądowego kręgowca – tetrapoda. W tym samym kamieniołomie znaleziono dobrze zachowane 3 ślady po pojedynczych kryształach halitu (na 2 próbkach skał). Wielkość śladów po tych kryształach wynosi od 1 do ok. 2,5-3 cm. Przypuszczalnie jeden ślad zostawił kryształ sześcienny, a 2 ślady powstały po kryształach typu hopper. Kilkakrotnie szczegółowo przebadane i opisane utwory dolomitowe z tego miejsca wskazują, że środowiskiem ich depozycji była płytka, rozległa laguna odsłaniająca kilkakrotnie dno i okresowo sprzyjająca sedymentacji ewaporatów. W niniejszym artykule autorka rozważa możliwość miejsca oraz czasu krystalizacji halitów, tzn. czy te kryształy wytrąciły się z roztworu w zbiorniku, czy też nieco później, już w obrębie osadu węglanowego, na skutek penetracji sedymentu przez solanki. Oba „miejsca” i czas precypitacji halitu wydają się równie prawdopodobne.
    Źródło:
    Przegląd Solny; 2017, 13; 135--140
    2300-9349
    Pojawia się w:
    Przegląd Solny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Geomorphological map of the surroundings of Cortina d’Ampezzo (Dolomites, Italy)
    Autorzy:
    Pasuto, A.
    Soldati, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/294613.pdf
    Data publikacji:
    2007
    Wydawca:
    Stowarzyszenie Geomorfologów Polskich
    Tematy:
    geomorphological map of the surroundings
    Cortina d’Ampezzo
    Dolomites
    Italy
    Źródło:
    Landform Analysis; 2007, 5; 63-65
    1429-799X
    Pojawia się w:
    Landform Analysis
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Size and localisation of knots in timber from mountain spruce stands in the Dolomites
    Autorzy:
    Barszcz, A.
    Sandak, A.
    Sandak, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/38333.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    size
    localization
    knot
    timber
    mountain spruce
    tree stand
    Dolomites
    knot healthiness
    Opis:
    The aim of the study was evaluation of knots in wood of 150-year-old Norway spruce [Picea abies (L.) Karst.] in stands situated at the altitude of 1450– 1740 m above sea level in the Dolomites in Italian section of the Alps. In selected stands, spruce trees were cut down and their length, stem thickness, height to the crown base and stem diameters at every 1 m along the length of merchantable bole were measured. The diameter of knots was measured and they were classified according to their healthiness and the degree of their tightness with the surrounding wood. The relative knot diameters were calculated and the relative height of their location on stem was determined. In total on sample trees there were analysed 1070 knots, of which sound knots (close to 75%) and tight (more than 60%) prevailed. Sound and tight knots had largest diameters, relative diameters and relative heights of location on merchantable boles. The smallest diameters and relative diameters were indicated by rotten and not tight knots that were located at the lowest merchantable bole parts.
    Źródło:
    Folia Forestalia Polonica. Series A . Forestry; 2010, 52, 1
    0071-6677
    Pojawia się w:
    Folia Forestalia Polonica. Series A . Forestry
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The uppermost Emsian and lower Eifelian in the Kielce Region of the Holy Cross Mts. Part I: Lithostratigraphy.
    Autorzy:
    Wójcik, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/138993.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    lithostratigraphy
    Devonian
    Eifelian
    Holy Cross Mountains
    Dolomites
    litostratygrafia
    dewon
    Góry Świętokrzyskie
    Dolomity
    Opis:
    The paper provides a description of primary geological logs, characteristics and formal lithostratigraphy of the uppermost Emsian and lower Eifelian of the Kielce Region of the Holy Cross Mts., central Poland. Nine sections of this interval, representing the whole area of the Kielce Region, and ranging between the Lower Devonian clastics of the Winna Formation and the Middle Devonian carbonates of the Kowala Formation were studied. The succession is divided into the Barania Góra Dolomite and Limestone Formation and the Wojciechowice Dolomite Formation. Six members are distinguished within the former. In the western part of the region these are (in stratigraphical order): Porzecze Claystone Member, Dębska Wola Dolomite Member, Dąbrowa Limestone Member, and Brzeziny Dolomite Member. In the eastern part, the formation is divided into the Janczyce Dolomite Member and the Jurkowice Dolomite Member. Additionally, the Wszachów Dolomite Member and Nowy Staw Dolomite Member are distinguished within the overlying Wojciechowice Formation. The thickness of the uppermost Emsian–Eifelian succession ranges from ca. 200 m in the eastern part to ca. 130 m in the western part of the Kielce Region.
    Źródło:
    Acta Geologica Polonica; 2015, 65, 2; 141-179
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Knottiness of spruce stems from the Dolomites as the basis for distinguishing quality zones in roundwood
    Autorzy:
    Barszcz, A.
    Sandak, A.
    Sandak, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/38323.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    knottiness
    Norway spruce
    Picea abies
    stem
    Dolomites
    quality zone
    roundwood
    knot category
    knot zonation
    Źródło:
    Folia Forestalia Polonica. Series A . Forestry; 2010, 52, 2
    0071-6677
    Pojawia się w:
    Folia Forestalia Polonica. Series A . Forestry
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zechstein marine deposits in the Wleń Graben (North Sudetic Synclinorium, SW Poland) : new insights into the palaeogeography of the southern part of the Polish Zechstein Basin
    Autorzy:
    Kowalski, A.
    Durkowski, K.
    Raczyński, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/973706.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    Polish Zechstein Basin
    dolomites
    Permian
    Triassic
    Transitional Terrigenous Series
    PZt
    North Sudetic Synclinorium
    Wleń Graben
    Opis:
    This paper presents the results of sedimentological studies of Zechstein marine deposits occurring in the Wleń Graben, a tectonic unit located in the southeastern part of the North Sudetic Synclinorium (NSS; Western Sudetes, SW Poland). Owing to poor exposure, small thickness, and lack of palaeontological data, the stratigraphy and age of these rocks were determined solely on the basis of analogies with adjacent areas. New findings described here, including faunal remains (remains of bivalves, including Liebea sp.), geopetal structures, clastic fills of halite crystals, moulds and bioturbation, shed new light on the environmental interpretations of the Zechstein in this part of the NSS. It should be assumed that at least two types of deposit may be assigned to the marine Zechstein in the Wleń Graben area, namely sparitic and microsparitic dolomite (PZ3) and the overlying deposits of the heterolithic series (PZt). These deposits were formed during the late Zechstein transgression, when the study area was in the marginal southwesternmost part of a newly formed shallow-marine bay of the Polish Zechstein Basin. In the central part of the present-day Wleń Graben, a shallow-marine bay (lagoon?) was dominated by carbonate sedimentation. A north-dipping mud plain, periodically flooded by a shallow sea, occurred in the southern part of the area. The paper summarises the present state of research on Permian deposits in the Wleń Graben, the first comprehensive lithostratigraphic scheme is suggested, and a new concept of the palaeogeographic evolution of the area in the Early and Late Permian is proposed.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2018, 88, 4; 321-339
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Palaeoenvironmental evolution of the Southern Alps across the Faraoni Level equivalent : new data from the Trento Plateau (Upper Hauterivian, Dolomites, N. Italy)
    Autorzy:
    Lukeneder, A.
    Grunet, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/139422.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    kreda dolna
    Dolomity
    hoteryw
    płaskowyż
    Włochy
    Dolomites
    Faraoni oceanic anoxic event
    Hauterivian
    Italy
    Lower Cretaceous
    Trento Plateau
    Opis:
    New stratigraphic and palaeoenvironmental data are presented for the northeastern part of the Trento Plateau (Puez area, Southern Alps, Italy). The studied section corresponds to the upper Hauterivian Balearites balearis and "Pseudothurmannia ohmi" ammonite zones and normal palaeomagnetic chron upper M5. A c. 30-cm-thick bed is identified as the equivalent of the Faraoni Level, based on its position within the Pseudothurmannia mortilleti Subzone, the composition of its ammonite fauna and the peak of a minor positive trend in the [delta]13 Cbulk record. Microfacies and geochemical proxies compare well with those of the southeastern part of the Trento Plateau and indicate palaeoceanographic continuity along the eastern margin of the plateau. The abundances of radiolarians and nannoconids suggest a turnover in the trophic structure from eutrophic conditions around the Faraoni Level equivalent to oligotrophic conditions. Low organic matter and sulphur content and frequent bioturbation indicate a well-oxygenated environment. Ammonite diversity and life-habitat groups document the influence of sea level on the plateau: while epi- and mesopelagic ammonites occur commonly during sea-level highstands, all life-habitat groups become reduced during a sea-level lowstand in the Spathicrioceras seitzi and P. ohmi subzones. The Faraoni event is heralded by a faunal turnover expressed as the diversification of epipelagic ammonites. Palaeoenvironmental conditions along the eastern margin of the Trento Plateau during the Faraoni event contrast with those of the organic-rich black shales in the west. A re-evaluation of the depositional model based on the new results suggests a general water depth of 300-500 m for the plateau. The severe reduction of mesopelagic ammonites during the sea-level lowstand indicates a shallowing towards the epi-/mesopelagic boundary. During the Faraoni event, the eastern areas of the Trento Plateau were located at the upper limit of the oxygen-minimum layer and were thus only occasionally affected by oxygen depletion, whereas the western areas were located well within the upper part of the oxygen-depleted layer.
    Źródło:
    Acta Geologica Polonica; 2013, 63, 1; 89-104
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The ferns of the Late Ladinian, Middle Triassic flora from Monte Agnello, Dolomites, Italy
    Autorzy:
    Kustatscher, E.
    Dellantonio, E.
    Van Konijnenburg-van Cittert, J.H.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/21744.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    fern
    Dipteridaceae
    Matoniaceae
    Phlebopteris
    Cladophlebis
    Chiropteris
    Thaumatopteris
    plant fossil
    fossil
    paleobotany
    Late Ladinian
    Middle Triassic
    flora
    Dolomites
    Italy
    Opis:
    Several fern remains are described from the para-autochthonous early late Ladinian flora of the Monte Agnello (Dolomites, N-Italy). The plants are preserved in subaerially deposited pyroclastic layers. Some ferns, known already from the Anisian and Ladinian of this area, are confirmed (Neuropteridium elegans), but several taxa are described for the first time (Phlebopteris fiemmensis sp. nov., Cladophlebis ladinica sp. nov., Chiropteris monteagnellii sp. nov.). Cladophlebis sp. and some indeterminable fern remains cannot yet be assigned to any family. Phlebopteris fiemmensis is now the oldest formally established species in the genus. The fern family Dipteridaceae (Thaumatopteris sp. and some fragments probably belonging to the Dipteridaceae because of their venation) has not been recorded previously from European sediments as old as the Ladinian. Although stratigraphically attributed to the late Ladinian, the flora is markedly distinct from other Ladinian floras of the Dolomites and the Germanic Basin. The flora from Monte Agnello shows a higher diversity in ferns than coeval floras from this area although characteristic elements of the Ladinian of the Dolomites such as Anomopteris and Gordonopteris are missing. The new flora misses also the Marattiales (e.g., Danaeopsis, Asterotheca) and other elements such as Sphenopteris schoenleiniana, typical for the Ladinian of the Germanic Basin.
    Źródło:
    Acta Palaeontologica Polonica; 2014, 59, 3
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Najbardziej wartościowe stanowiska Białorusi
    Autorzy:
    Vinokurov, V.
    Komarovsky, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1188039.pdf
    Data publikacji:
    1999
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    geostanowiska
    europejska sieć geostanowisk
    osady plejstoceńskie
    unikalne odsłonięcie dolomitów
    Białoruś
    geoconservation
    network of European geosites
    Pleistocene deposits
    unique exposure of Devonian dolomites
    Belarus
    Opis:
    Osady czwartorzędowe są najbardziej rozpowszechnioną formacją na terenie Białorusi. Powstały podczas zlodowaceń plejstoceńskich i tworzą zwartą pokrywę (do 320 m) na obszarze kraju. Standardowe odsłonięcia plejstoceńskie i holoceńskie, wielkie głazy oraz wyrazista rzeźba są typowymi elementami i tworzą główną część najbardziej malowniczego krajobrazu Białorusi. Dziesięć najbardziej interesujących obszarów chronionych tzw. zakazników (tj. obszarów chronionych z unikalnymi obiektami przyrodniczymi - kategoria IV wg klasyfikacji IUCN) i pomniki zlokalizowane w różnych regionach geologicznych Białorusi są kandydatami na listę najcenniejszych geostanowisk Nizin Środkowoeuropejskich. Obiekty chronione na terenie obszarów chronionego krajobrazu obejmują: wzgórza moren końcowych oraz pagórki ze standardami morfologicznymi wraz z jeziorami w dolinach lodowcowych będących dolinami marginalnymi, wychodnie holsztyńskich osadów jeziornych i torfowych, profile stratotypowe pokazujące osady interglacjalne, jedną z trzech lokalizacji dolomitów dewońskich na powierzchni ziemi, jeden głaz zlepieńców oraz trzy największe głazy narzutowe.
    Źródło:
    Polish Geological Institute Special Papers; 1999, 2; 91-96
    1507-9791
    Pojawia się w:
    Polish Geological Institute Special Papers
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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