Temat: grain-size analysis - Katalog OPAC zbiorów

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Tytuł:: Optical methods in the grain-size analysis of fine-grained sediments
Autorzy:: Issmer, K.
Powiązania:: https://bibliotekanauki.pl/articles/2059416.pdf
Data publikacji:: 2000
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: optical method
grain-size analysis
Kołmogorow-Smirnow non-parametric test
Opis:: Optical methods now dominate the grain-size analysis of fine-grained sediments, because of their rapidity. The growing application of optical methods leads to statistical comparison of their results against those from sedimentation methods. Here, the Kołmogorow-Smirnow non-parametric test is demonstrated. Most agreement exists in the 50-20 and 20-6 mm fraction. In order to compare the optical and the combined methods, correlation ratios were calculated for all commonly used grain-size fractions. Regression equations were established for the 50-20 mm fraction.
Źródło:: Geological Quarterly; 2000, 44, 2; 205-210
1641-7291
Pojawia się w:: Geological Quarterly
Dostawca treści:: Biblioteka Nauki

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Tytuł:: Sedimentary evidence of extreme storm surge or tsunami events in the southern Baltic Sea (Rogowo area, NW Poland)
Autorzy:: Piotrowski, A.
Szczuciński, W.
Sydor, P.
Kotrys, B.
Rzodkiewicz, M.
Krzymińska, J.
Powiązania:: https://bibliotekanauki.pl/articles/2060594.pdf
Data publikacji:: 2017
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: tsunami deposits
storm surge deposits
grain size analysis
geochemistry
radiocarbon dating
Baltic Sea
Opis:: The Baltic Sea is not typically considered as an area affected by tsunamis. However, during the Late Pleistocene and Holocene several tsunami events have been interpreted from the sedimentary record, mainly in Sweden and Estonia. Furthermore, on the southern coast of the Baltic Sea, there are historical accounts of catastrophical marine floodings called “der Seebär” (“the Sea Bear”). Their descriptions reveal many features typical for tsunami, but their genesis remained unknown and sedimentary evidence for such events has not been found. Here we provide evidence of sandy event layers from the area of Rogowo, NW Poland – the area of historical catastrophic storms as well as “der Seebär” events. The study area is a low-lying coastal plain with an average elevation of –0.5 to +0.5 m a.s.l., protected from the open sea by beach and coastal dune systems up to 5 m high. Sedimentological, micropalaeontological and geochemical analyses along with AMS 14C dating were applied to sedimentary successions seen in 5 major trenches and 198 sediment cores up to 1.5 m long. Two sandy layers were identified in the peat deposits that developed on the plain during the last ~2000 years. They reveal a number of typical features of tsunami deposits (significant lateral extent and thickness, rip-up clasts, chemical and micropalaeontological evidence of marine origin), however, 14C dating along with the historical accounts revealed that the major layer, extending at least 1.2 km from the modern coasts, was probably deposited by arguably the largest storm surge during the last 2000 years, which took place in 1497 AD. These storm deposits were likely formed during inundation of the low-lying coastal plain after major breaching of coastal dunes resulting in tsunami – like flow pattern and thus similar sedimentological effects. A discontinuous sand layer of younger age (18th century) and sharing similar properties to the previous one may be related to “der Seebär” event or another storm surge. The study revealed that the southern Baltic Sea coast may be affected by much greater coastal flooding than known from more recent accounts and observations. Thus, the presented geological record should be taken as an example of a worst-case scenario in coastal zone risk assessment from natural hazards. These events left sedimentary deposits that resemble tsunami deposits. It is likely that, in similar settings where storm surges cause unidirectional inundation of a coastal plain, it may not be possible to establish whether the resulting deposits were laid down from storms or tsunamis.
Źródło:: Geological Quarterly; 2017, 61, 4; 973--986
1641-7291
Pojawia się w:: Geological Quarterly
Dostawca treści:: Biblioteka Nauki

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Tytuł:: Budowa geologiczna form glacimarginalnych na Wyżynie Przedborskiej – przykładowe studia
Geological structure of the glacimarginal forms of the Przedbórz Highland, selected samples
Autorzy:: Wachecka-Kotkowska, L.
Powiązania:: https://bibliotekanauki.pl/articles/2062131.pdf
Data publikacji:: 2013
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: analiza uziarnienia
analiza strukturalna
formy glacimarginalne
zlodowacenia środkowopolskie
Wyżyna Przedborska
stadiał warty
grain-size distribution
structural analysis
glaciomarginal landforms
Warta Stage
Middle Polish Glaciations
Przedbórz Highland
Opis:: W artykule przedstawiono charakterystykę litologiczną osadów budujących wybrane formy glacimarginalne: morenę czołową akumulacyjną (stanowisko Masłowice), powierzchnię wysoczyzny morenowej falistej (stanowisko Ochotnik), przypuszczalną morenę martwego lodu (stanowisko Ludwików), kem (stanowisko Miejskie Pola). Formy pochodzą ze stadiału warty zlodowaceń środkowopolskich, są położone na północnych stokach ostańców mezozoicznych Wyżyny Przedborskiej. Wykonano analizy strukturalne, wybrane analizy teksturalne (uziarnienia i morfoskopowe) oraz oznaczono zawartości CaCO3 w osadach. Wykazano znaczący wpływ elewacji radomszczańskiej na przebieg i mieszany charakter deglacjacji. Wskazano, że formy glacimarginalne cechuje zróżnicowanie litofacjalne i litogenetyczne związane z dużą dynamiką deglacjacji lądolodu warty w brzeżnej części lobu Rawki, Pilicy i Luciąży.
The article presents the lithological characteristics of sediments composing some marginal landforms: accumulated frontal moraine (Masłowice site), moraine plateau (Ochotnik site), alleged dead-ice moraine (Ludwików site) and kame (Miejskie Pola site). The landforms developed during the Warta Stage of the Middle Poland Glaciations and are located on the northern slopes of the remnant Mesozoic hills of the Przedbórz Highland. A structural and textural analysis (grain-size distribution and morphoscopy) was made and the CaCO3 content in the sediment was determined. A significant effect of the Radomsko elevation on the course and the mixed nature of the deglaciation has been proved. The marginal landforms are characterized by lithogical and lithofacies diversity related to the high dynamics of the Wartanian ice-sheet in its frontal part of the Rawka, Pilica and Luciąża Lobe.
Źródło:: Biuletyn Państwowego Instytutu Geologicznego; 2013, 454; 103--120
0867-6143
Pojawia się w:: Biuletyn Państwowego Instytutu Geologicznego
Dostawca treści:: Biblioteka Nauki

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