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Tytuł:
Clasts derived from rhizocretions in shallow-marine Miocene clastic deposits of northern Hungary: an example of zombie structures
Autorzy:
Uchman, Alfred
Dávid, Árpád
Fodor, Rozália
Powiązania:
https://bibliotekanauki.pl/articles/25173307.pdf
Data publikacji:
2023
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
redeposition
concretions
rhizocretions
alaeosols
clastic deposits
Neogene
Opis:
Disc- and cylindrical-shaped clasts of fine-grained calcareous and ferruginous rock, each with a central tunnel, occur in shallow marine brackish Miocene sandy deposits of the Egyházasgerge Formation in Hungary. Previously, these have been interpreted as enigmatic biogenic (?) structures. After field and laboratory examination and comparisons with sub-recent rhizoclasts in subsoils developed on Quaternary fine-grained deposits in SE Poland, they are re-interpreted as redeposited rhizocretions possibly washed out of the coeval continental deposits of the Salgótarján Lignite Formation. Most are fragmented and abraded. They are termed rhizoclasts and are presented as an example of zombie structures inherited from another environment where they played a different role. Such rhizoclasts can be considered as an indicator of the source of the clastic material transported from a vegetated landmass on which moderate or poorly drained soils develop and plant roots penetrate the fine-grained substrate. In such soils, iron was mobilized, then fixed by oxidation, as the water table and oxygen levels fluctuated.
Źródło:
Geological Quarterly; 2023, 67, 1; art. nr 4
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Konzentrat-Lagerstätte-type carbonate concretions from the uppermost Bajocian (Middle Jurassic) of the Częstochowa area, South-Cental Poland
Autorzy:
Zatoń, M.
Marynowski, L.
Powiązania:
https://bibliotekanauki.pl/articles/2058808.pdf
Data publikacji:
2004
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Jurassic
Bajocjan
carbonate concretions
taphonomy
Lagerstätte
biomarkers
Opis:
Early-diagenetic calcitic concretions of latest Bajocian (parkinsoni Zone, bomfordi Subzone) age in the Polish Jura contain an extremely rich and well-preserved macrofauna. In addition to bivalves and brachiopods, there are numerous ammonites of the (sub)genera Parkinsonia, Nannolytoceras, Lissoceras (Lissoceras), L. (Microlissoceras), as well as rare representatives of Vermisphinctes, Strigoceras (Strigoceras) and Phylloceras. Carapaces of primitive prosopid crabs are found associated. Such a diverse and well-preserved fauna (previously unknown from Bajocian epicratonic deposits of the Polish Jura), is typical of Konzentrat-Lagerstätte-type deposits. The random distribution of the concretions in exposure and the small size of the fauna may suggest that all remains were concentrated by bottom-current action in small depressions on an uneven sea-floor. The presence of numerous small-sized ammonites may be regarded as reflecting post-spawning assemblages which sufferedmass-mortality. Although cause of their death remains unclear, storm events are a possibility. Such depressions acted as natural “traps” as well as constituted a size-limiting factor for the accumulating fauna. The fact that all elements are well preserved indicates brief post-mortem transport and rapid burial, followed by early diagenesis that protected them from compaction. The absence of such fossil-rich concretions higher in the Middle Jurassic sequence clearly shows that our current assessment of biotic diversity may be an underestimate. The carbonate concretions contain a predominantly terrestrial type of organic matter (OM). Samples analysed are extremely immature, but early diagenetic transformations of OM occurred prior to concretion formation.
Źródło:
Geological Quarterly; 2004, 48, 4; 339--350
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Origin of "cannon-ball" concretions in the Carolinefjellet Formation (Lower Cretaceous), Spitsbergen
Autorzy:
Krajewski, Krzysztof P.
Luks, Bartłomiej
Powiązania:
https://bibliotekanauki.pl/articles/2052073.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Arctic
Svalbard
Lower Cretaceous
"cannon-ball" concretions
diagenesis
Źródło:
Polish Polar Research; 2003, 24, 3-4; 217-242
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Terrigenous organic matter and formation of siderite in the Bathonian Ore-Bearing Clay Formation at Gnaszyn, Poland : a petrochemical study
Autorzy:
Lis, Kacper
Wojtulek, Piotr
Lis, Grzegorz
Jelonek, Iwona
Powiązania:
https://bibliotekanauki.pl/articles/2171817.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
organic matter
kerogen
siderite concretions
microbial decay
Jurassic
Opis:
The Bathonian Ore-Bearing Clay Formation, outcropping in the Gnaszyn open-pit mine at Częstochowa (Poland), includes several horizons of abundant iron carbonate concretions. The cores of the concretionary bodies commonly contain organic matter (OM), dominated by fragments of wood. These organic particles usually display well-preserved primary structures and occur rarely as more deformed and/or completely degraded fragments. Their original structures are frequently replaced by or filled with secondary mineralization, mostly represented by pyrite. The maceral composition of the OM of the wood fragments is dominated by huminite with subordinate inertinite and resinite. Vitrinite reflectance analyses revealed values lower than 0.45%. The total organic carbon content (TOC) displayed variable results between 2% and 18%. Rock-Eval analyses revealed low amounts of hydrogen (< 45 mg HC/g TOC) and relatively high amounts of oxygen (up to 136 mg CO2/g TOC). Analysed samples contained small quantities of free hydrocarbons (S1 peak < 0.26 mg HC/g rock) as well as hydrocarbons, generated during pyrolysis (S2 peak < 7.05 mg HC/g rock). These features are characteristic for immature type IV kerogen of terrigenous origin. However, the maceral composition and frequent occurrence of siderite affecting the Rock-Eval parameters may indicate that the original kerogen belonged to type III. According to previous authors, the OM of terrigenous origin was delivered to well-oxygenated water of the palaeo-basin in the Częstochowa area. The present data indicate that intensive biodegradation of this OM at shallow burial depleted the oxygen supply within the sediment, driving the pore water into dys- or anoxic conditions. The activity of microorganisms in reducing iron and/or sulphates became the dominant biodegradation reaction, introducing Fe2+ and HCO3- ions into the system. Negative δ13C values in the cortex of the concretions analysed indicate that the bicarbonate consumed in siderite precipitation was supplied by this microbial activity. The reducing microenvironments developed in the sediment and wood fragments acted as nucleation sites for siderite precipitation.
Źródło:
Annales Societatis Geologorum Poloniae; 2022, 92, 3; 295--312
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on preliminary concept of ship intended for mining poly-metallic concretions from sea bed
Autorzy:
Bortnowska, M.
Powiązania:
https://bibliotekanauki.pl/articles/258650.pdf
Data publikacji:
2008
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
deposits of Fe-Mn concretions
design assumptions
concept of mining ship
Opis:
Necessity to design and build a ship for winning Fe-Mn concretions from sea bed, and put it into operation, results mainly from decreasing land resources of mineral rough materials and increasing prices of metals. Main dimensions and parameters of such mining ship were determined by elaborating its main design assumptions and making use of suitable data on drilling ships considered similar from the point of view of attributed functions and spatial arrangement. In this paper a design study on preliminary concept of dimensions and spatial arrangement of a ship for winning poly-metallic concretions from sea bed, is presented. The study has been aimed at elaboration of an appropriate mathematical model to be applied for optimization of ship’s winning system.
Źródło:
Polish Maritime Research; 2008, 1; 29-36
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metody odzysku niektórych metali z konkrecji oceanicznych
Methods of recovery of some metals from oceanic nodules
Autorzy:
Sanak-Rydlewska, S.
Gala, A.
Powiązania:
https://bibliotekanauki.pl/articles/350610.pdf
Data publikacji:
2011
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
konkrecje oceaniczne
hydrometalurgia kobaltu i niklu
oceanic concretions
cobalt and nickel hydrometallurgy
Opis:
W artykule przedstawiono informacje dotyczące możliwości odzysku kobaltu i niklu z oceanicznych konkrecji polimetalicznych. Z uwagi na niskie zawartości tych metali konieczne jest zastosowanie procesów ługowania za pomocą reagentów o charakterze kwaśnym lub alkalicznym. Po zapoznaniu się z wartością stężenia wyługowanego metalu, korzystne jest jego wydzielenie z roztworów potrawiennych za pomocą metody ekstrakcji lub elektrolizy. W przypadku niskiego stężenia metalu należy wykorzystać metodę umożliwiającą jego zatężenie a następnie zastosować metodę selektywnego wydzielenia. Do skoncentrowania składnika w roztworach rozcieńczonych służą metody oparte na wymianie jonowej (np. wymieniacze jonowe) lub flotacji jonów i osadów. Powodzenie tych metod jest w dużym stopniu uzależnione od tego, czy stosowany reagent (lub reagenty) da się regenerować, by ponownie, w jak największej ilości zawrócić go do procesu. Wiąże się to z opłacalnością ekonomiczną oraz z ochroną środowiska naturalnego.
This paper presents the informations about the possibility of cobalt and nickel recovery from some poor raw materials, including ocean concretions. Due to the low content of these metals, it is necessary to apply leaching processes using acidic or alkaline reagents. After reviewing the value of concentration of the leached metal, it is preferable to separate this metal from spent pickling liquors by extraction or electrolysis. In the case of low metal concentration, it is necessary to use a method that allows to concentrate the metal and then to use a method of selective separation. To concentrate the component in dilute solutions, methods based on ion exchange (eg ion exchangers) or ions and precipitates flotation are used. The success of these methods mainly depends on whether the applied reagent (or reagents) can be regenerated, to be used again in the process. This determines the economic viability and environmental protection.
Źródło:
Górnictwo i Geoinżynieria; 2011, 35, 4/1; 341-351
1732-6702
Pojawia się w:
Górnictwo i Geoinżynieria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ferrum concretions forms in the mollic gley soils of Low (Male) Polissya
Autorzy:
Pankiv, Z.
Yamelynets, T.
Powiązania:
https://bibliotekanauki.pl/articles/971171.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
ferrum concretions forms
mollic gley soils
low (male) polissya
the accumulation
coefficien
Opis:
In the humid conditions, the most common ground forms are the ferruginous ones: ferum concretions, marsh ore, ocher spots, etc. Mollic gley soils are widely spread along the periphery of marshes and are formed under the influence of mollic and gley processes on various soil-forming rocks under conditions of sporadically pulsating water regime and excessive moisture under the meadow and swamp biocenoses. The ferrum concretions are characteristic of all genetic horizons of mollic gley soils, except for the soil-forming rock, and their content ranges from 3.3% in the mollic to 47.1% in the lower transitional horizon. The gross iron content in the fine mollic gley soils, as well as in the ferrum concretions forms, increases with depth, and the maximum values are characteristic of the lower transition horizon. The lowest values of the gross iron content are characteristic of the fine soil-forming rock (16.0 mg / 100 g soil) and the mollic soil (66.4 mg / 100 g soil). It was established that the gross chemical content of the ferrum concretions forms is dominated by the iron oxides with the highest content in the ferrum concretions of the mollic soils (48.75%). Also the ferrum concretions forms of iron are characterized by a rather high content of aluminum oxides (5.59–7.92%). The highest values of the accumulation coefficient are character- istic of the iron oxide (Kx = 7.21–2.58), which confirms the hypothesis of the dominant role of its compounds in the formation of the ferrum concretions forms.
Źródło:
Polish Journal of Soil Science; 2020, 53, 1
0079-2985
Pojawia się w:
Polish Journal of Soil Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ferrum concretions forms in the mollic gley soils of Low (Male) Polissya
Autorzy:
Pankiv, Zenoviy
Yamelynets, Taras
Powiązania:
https://bibliotekanauki.pl/articles/2088206.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
ferrum concretions forms
mollic gley soils
Low (Male) Polissya
the accumulation coefficient
Opis:
In the humid conditions, the most common ground forms are the ferruginous ones: ferrum concretions, marsh ore, ocher spots, etc. Mollic gley soils are widely spread along the periphery of marshes and are formed under the influence of mollic and gley processes on various soil-forming rocks under conditions of sporadically pulsating water regime and excessive moisture under the meadow and swamp biocenoses. The ferrum concretions are characteristic of all genetic horizons of mollic gley soils, except for the soil-forming rock, and their content ranges from 3.3% in the mollic to 47.1% in the lower transitional horizon. The gross iron content in the fine mollic gley soils, as well as in the ferrum concretions forms, increases with depth, and the maximum values are characteristic of the lower transition horizon. The lowest values of the gross iron content are characteristic of the fine soil-forming rock (16.0 mg / 100 g soil) and the mollic soil (66.4 mg / 100 g soil). It was established that the gross chemical content of the ferrum concretions forms is dominated by the iron oxides with the highest content in the ferrum concretions of the mollic soils (48.75%). Also the ferrum concretions forms of iron are characterized by a rather high content of aluminum oxides (5.59–7.92%). The highest values of the accumulation coefficient are characteristic of the iron oxide (Kx = 7.21–2.58), which confirms the hypothesis of the dominant role of its compounds in the formation of the ferrum concretions forms.
Źródło:
Polish Journal of Soil Science; 2020, 53, 1; 137-148
0079-2985
Pojawia się w:
Polish Journal of Soil Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The development and origin of the two-stage silicification of Upper Jurassic limestones from the northern part of the Kraków-Częstochowa Upland (Southern Poland)
Autorzy:
Kochman, Alicja
Matyszkiewicz, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/27310144.pdf
Data publikacji:
2023
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
chert concretions
silicified limestones
stages of silicification
Upper Jurassic
tectonics
Kraków-Częstochowa Upland
Opis:
The Upper Jurassic carbonates representing the microbial-sponge megafacies in the area of the Kraków-Częstochowa Upland (KCU) were locally silicified. In the reclaimed Lipówki Quarry, in Rudniki near Częstochowa (in the northern part of the Upland), macroscopically different silicification products were observed in blocks of Upper Jurassic limestones, deposited as mining waste. Two varieties were distinguished: (i) chert concretions representing the I silicification stage and (ii) light-brown, silicified limestones infilling the fractures in chert concretions or forming the cortices around the concretions or forming irregular bodies, all representing the II silicification stage. The diagnostic features are the following: (i) macroscopic development, (ii) the presence of moganite exclusively in chert concretions and (iii) significant differences in crystallinity index (CI) values, namely: 0.1–0.7 for chert concretions and 6.0–6.6 for silicified limestones. The formation of chert concretions was initiated as early as in unconsolidated sediment, whereas the II silicification stage followed the chemical compaction of the limestones. The results of geochemical analyses of the products of both silicification stages indicated that the probable source of silica were the low-temperature hydrothermal solutions. Two types of fractures were found in the chert concretions, generated during different tectonic events. The older, open fractures were formed during the extension of the Late Jurassic sedimentary basin, which formerly occupied the territory of the more recent KCU. These fractures were infilled with unconsolidated, fine-detrital carbonate sediment, in which the concretions were embedded and finally silicified in the II silicification stage. The younger, closed fractures, transversal to those filled by the products of II silicification stage, along which small displacements are evident, document the later tectonic deformations presumably related to Cenozoic faulting.
Źródło:
Geology, Geophysics and Environment; 2023, 49, 3; 225--243
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Palaeoenvironmental significance of iron carbonate concretions from the Bathonian (Middle Jurassic) ore-bearing clays at Gnaszyn, Kraków-Silesia Homocline, Poland
Autorzy:
Witkowska, M.
Powiązania:
https://bibliotekanauki.pl/articles/138739.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
baton
bioturbacja
jura
konkrecja syderytu
monoklina śląsko-krakowska
paleośrodowisko
Polska
redoks
wczesna diageneza
Bathonian
bioturbation
Cracow-Silesia Homocline
early diagenesis
Jurassic
palaeoenvironment
Phosphate-siderite concretions
Polska
Redox boundary
Siderite concretions
Opis:
Iron carbonate concretion horizons are characteristic features of the Bathonian (Middle Jurassic) claystone-mudstone succession at Gnaszyn. They occur in single horizons, which generally represent the same genetic type. The siderite concretions are the main type of iron carbonate concretions at Gnaszyn; a second type is represented by phosphate-siderite concretions. On the basis of the fieldwork, and their petrographical and mineralogical characteristics, the genesis of the concretions and their palaeoenvironmental significance is discussed. The results of this study (based on the localization, mode of occurrence, mineralogy of iron carbonate concretions and also the textural relationship between the concretions and host sediment layers) suggest an early diagenetic origin of the concretions. The preferential occurrence of the concretion horizons in single layers in the ambient sediments was associated with particular conditions of their deposition and early diagenesis, favored by a slower sedimentation rate and more intense bioturbation, and related primarily to the greater availability of reactive iron ions. From the viewpoint of physicochemical conditions the horizons with iron carbonate concretions in the study area reflect the redox boundary between oxic/bioturbated and anoxic/non-bioturbated zones. The conditions favoring the formation of such horizons was possibly due to longer periods of diminished sedimentation rate when the redox boundary remained in the same position within the sediment.
Źródło:
Acta Geologica Polonica; 2012, 62, 3; 307-324
0001-5709
Pojawia się w:
Acta Geologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lower Kimmeridgian layer with bored and encrusted hiatus concretions (Upper Jurassic, Central Poland) : implications for stratigraphy and basin evolution
Autorzy:
Krajewski, M.
Olchowy, P.
Felisiak, I.
Powiązania:
https://bibliotekanauki.pl/articles/191944.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
calciturbidites
hardground
synsedimentary tectonism
hiatus concretions
borings
encrustations
marker horizon
Upper Jurassic
Central Poland
Opis:
The paper presents a comparative analysis of a Lower Kimmeridgian layer with bored and encrusted hiatus concretions collected in three study areas, located in Central Poland. These studies demonstrate distinct similarities between the hiatus concretions in terms of their origin, development and stratigraphic position. The layer with its characteristic concretions seems to represent an important marker horizon for the Lower Kimmeridgian successions in Central Poland. The identification of this marker horizon in drill cores and exposures could be important for definition of the stratigraphic position of the sediments, which otherwise lack appropriate biostratigraphic information. The matrix of the concretions is composed of pelagic calciturbidites, which reflect flooding of the early Kimmeridgian platform. These sediments were lithified early and formed a hardground. The origin of the hiatus concretions probably is related to erosion of the hardground, followed by redeposition and several phases of exhumation and erosion, preceding final burial. The characteristic ecological successions, observed in the concretions, document an evolution from soft to firm and hard marine substrates, typical of hardgrounds and evidenced by various burrows, borings (Gastrochaenolites, Trypanites), and epizoans. Calciturbidite sedimentation, hardground erosion and redeposition of the hiatus concretions, known from deposits of the Platynota Zone in Central Poland, were associated with synsedimentary activity of the Holy Cross Fault, on the NE margin of the extensive, tectonic Małopolska Block.
Źródło:
Annales Societatis Geologorum Poloniae; 2014, 84, 2; 113-129
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Konkrecje hiatusowe z iłów rudonśnych Wyżyny Krakowsko-Częstochowskiej
Hiatus concretions fromthe ore-bearing clays of the Cracow-Czestochowa Upland (Polish Jura)
Autorzy:
Zatoń, M.
Marynowski, L.
Bzowska, G.
Powiązania:
https://bibliotekanauki.pl/articles/2074474.pdf
Data publikacji:
2006
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
konkrecje hiatusowe
Wyżyna Krakowsko-Częstochowska
hiatus concretions
Middle Jurassic
Cracow-Częstochowa Upland
borers
encrusters
Opis:
Hiatus concretions are arly-diagenetic sedimentary bodies, which in their history of formation, underwent exhumation during sedimentation break and/or erosion of sea-floor. Then they were colonized by various encrusters and borers, before they were buried again. Within Middle Jurassic (Bajocian through Bathonian) clays, hiatus concretions occur in four localities in the Cracow-Częstochowa Upland (south and central Poland): Ogrodzieniec, Bugaj, Mokrsko and Krzyworzeka. Preliminary data about their mineralogy, organic geochemistry and palaeoecology is given. Mineralogical analyses showed, that except dominant high Mg-calcite (up to 87.10% of total carbonates), concretions possess minor amounts of such compounds as quartz, clay minerals (kaolinite and illite), pyrite, siderite or Mg-kutnahorite. However, high differences are observed between total organic carbon contents of concretions (TOC=0.46%) and surrounded clays (TOC = 2.16%), but their molecular composition is similar. Most of identified biomarkers are of terrestrial origin. In clay lithology, the hiatus concretions are the only sedimentary bodies that clearly mark the sedimentation pauses (hiatuses). In the investigated area, they form more or less continuous horizons. The concretions are calcitic, possessing various encrusting fauna such as bryozoans, oysters and oyster-like bivalves, serpulids, solitary corals and foraminifers. They often post-date the borings, belonging to such ichnogenera as Gastrochaenolites, Trypanites and Entobia. Some of the nodules show distinct transition from firmground (characterized by the presence of Glossifungites ichnocoenosis) to hardground (presence of Trypanites ichnocoenosis), pointing to the fact, that they formed at, or very close to, the sediment-water interface. Some concretions, like those from Bugaj and Mokrsko, are characterized by their high diversity of hard bottom communities. Those concretions are also irregular in shape; others, like those from Ogrodzieniec and Krzyworzeka, possess lower diversity. The concretions from Krzyworzeka are especially dominated by the borers, while the encrusters are sparse and not diverse. Those nodules that are wide and flat tend to be more bored on one surface only, while those that are more roundish, are bored on both sides more evenly. The degree of diversity is probably correlated with physical disturbance, causing the rolling and overturning of the exhumed concretions in the littoral zone. On the other hand, the overall diversity could be lowered due to destructive abrasion either of the shallowest borings, echinoid/gastropod scratch marks and shells of nestling bivalves, as well as more delicate epilithozoans.
Źródło:
Przegląd Geologiczny; 2006, 54, 2; 131-138
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mikrokonkrecje syderytowe w holoceńskich osadach ujścia rzeki Gwadiana w Portugalii : raport wstępny
Micro-scale sideritic concretions in Holocene sediments in the Guadiana estuary, Portugal : a preliminary report
Autorzy:
Wilamowski, A.
Boski, T.
Moura, D.
Powiązania:
https://bibliotekanauki.pl/articles/2075017.pdf
Data publikacji:
2013
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
siderite
concretions
estuarine sediment
Guadiana River
Holocene
syderyt
konkrecje
sedymentacja osadów
rzeka Gwadiana
holocen
Opis:
The authors described micro-scale carbonate concretions occurring at a depth of about 41 m within Holocene sandy sediments filling the Guadiana River paleovalley, representing the transitional fluvial- -estuarine facies. Despite their minute sizes, the micro-concretions show a complex internal structure. Regular distribution of Mg, Mn and Ca can be assigned to a chemical zoning, pointing to precipitation under varying chemical conditions. Based on morphological and chemical peculiarities, four types of concretions can be distinguished. Detrital Fe-Mg-carbonates form nuclei. At first, Mn-rich carbonate precipitated as a coating, which is coherent with the sequence of precipitation of carbonates associated with bacteria-mediated oxidation of organic matter. Subsequently, the main bodies of concretions precipitated as Fe-carbonate (siderite). The last precipitation episode is marked by enrichment in Ca. The XRD patterns show the presence of a mixture of discrete carbonate phases.
Źródło:
Przegląd Geologiczny; 2013, 61, 10; 568--575
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Struktury iłów poznańskich w obserwacjach mikroskopowych jako wskaźniki poligenezy osadów
Microfabric of the Poznań clays in microscopic studies as the indication of the polygenetic origin of sediments
Autorzy:
Duczmal-Czernikiewicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/2063045.pdf
Data publikacji:
2011
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
mikrostruktury
konkrecje
lustra ślizgowe
ślady po korzeniach
iły poznańskie
microstructures
concretions
slickensides
roots remnants
Poznań clays
Opis:
W artykule przedstawiono cechy mikrostrukturalne iłów poznańskich w świetle analiz mikroskopowych. Przy użyciu mikroskopu polaryzacyjnego opisano struktury po korzeniach roślin, mikrokonkrecje Fe-Mn, konkrecje kalcytowe i syderytowe, pustki będące pozostałościami po mikrokryształach „róż pustyni” oraz lustra ślizgowe. Struktury te mają charakter zarówno pierwotny, jak i wtórny, co wskazuje na wielostadialny sposób formowania się iłów poznańskich. Struktury po korzeniach roślin oraz lustra ślizgowe świadczą o rozwijających się procesach glebowych w powierzchniowych warstwach osadu, natomiast powstanie konkrecji żelazowo-manganowych i węglanowych jest związane ze zmianą warunków fizykochemicznych w osadach poddanych procesom wietrzenia.
This paper presents microfabric of the Poznań clays in microscopic investigations. The method allows describing the structures after plant roots, Fe-Mn globules, calcareous and siderite concretions, voids after “desert roses” microcrystallites, as well as slickensides. These features are of primary and secondary origin and indicate multistage formation of the studied sediments and polygenenetic processes in their geological history. Root remnants, and slickensides indicate pedogenesis, while microcrystallites, Fe-Mn globules and calcareous concretions were formed during the changes of physical and chemical conditions during weathering processes.
Źródło:
Biuletyn Państwowego Instytutu Geologicznego; 2011, 444; 47--54
0867-6143
Pojawia się w:
Biuletyn Państwowego Instytutu Geologicznego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zbigniew Sujkowski – uczony i żołnierz
Zbigniew Sujkowski – scientist and soldier
Autorzy:
Miecznik, J. B.
Powiązania:
https://bibliotekanauki.pl/articles/2075143.pdf
Data publikacji:
2014
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Cretaceous rocks
hornstones
siliceous concretions
radiolarites
diagenesis
Carpathian flysch
skały kredowe
rogowiec
konkrecja krzemionkowa
radiolaryt
diageneza
flisz karpacki
Opis:
Zbigniew Sujkowski was a co-founder of Polish sedimentary petrography and a pioneer of sedimentology. After studying geology at the University of Warsaw (1921–1925), he worked in 1927–1929 with Prof. Lucien Cayeux at Collège de France in Paris. He specialized in petrographic-sedimentological studies of Cretaceous deposits in Poland, but especially of siliceous rocks. His treatise on diagenesis, published posthumously in 1958, is among the classics of world geological literature. Zbigniew Sujkowski was a Polish patriot. In the period 1914–1920, he participated in the armed struggle for the independence of Poland, and during World War II – in the armed resistance movement against German occupation as the organizer of subversion. At the end of the war, he was in London; his return to Poland was impossible from political reasons. Sujkowski immigrated to Canada and took a job at MacMaster University in Hamilton. He died tragically in an accident.
Źródło:
Przegląd Geologiczny; 2014, 62, 5; 234--239
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 19

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