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    Tytuł:
    Heavy-mineral, mineral-chemical and zircon-age constraints on the provenance of Triassic sandstones from the Devon coast, southern Britain
    Autorzy:
    Morton, Andrew
    Hounslow, Mark W.
    Frei, Dirk
    Powiązania:
    https://bibliotekanauki.pl/articles/94463.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    heavy minerals
    zircon
    provenance
    Triassic
    Devon
    ciężkie minerały
    cyrkon
    proweniencja
    Trias
    Dewon
    Opis:
    An integrated heavy-mineral, mineral-chemical and zircon-dating study of the Triassic succession exposed on the south Devon coast, in the western part of the Wessex Basin, indicates derivation from a combination of granitic and metasedimentary lithologies of ages of mostly over 550 Ma. These sources were probably located at a relatively proximal location near the southern margin of the basin. Derivation from more distal sources in the Armorican Massif or local Variscan sources to the west appears unlikely in view of the scarcity of Permo-Carboniferous (Variscan-age) zircons. The Budleigh Salterton Pebble Bed Formation was derived from a different combination of source lithologies than the Otter Sandstone Formation, the former including staurolite-grade metasediments that were absent in the catchment area of the Otter Sandstone. The Devon coast succession has provenance characteristics that differ from equivalent sandstones further east in the Wessex Basin, and from sandstones in the East Irish Sea Basin to the north. These differences indicate that sediment supply patterns to the linked Triassic basin systems in southern Britain are complex, involving multiple distinct sub-catchment areas, and that heavy-mineral studies have considerable potential for unravelling these sub-catchment area sources.
    Źródło:
    Geologos; 2013, 19, No. 1-2; 67-85
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Predictive diagenetic clay-mineral distribution in siliciclastic rocks as a tool for identifying sequence boundaries in non-marine successions: the Coalspur Formation, west-central Alberta
    Autorzy:
    Khidir, Ahmed
    Catuneanu, Ovtavian
    Powiązania:
    https://bibliotekanauki.pl/articles/94436.pdf
    Data publikacji:
    2009
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    sequence stratigraphy
    non-marine deposits
    siliciclastics
    diagenesis
    clay minerals
    stratygrafia sekwencji
    krzemionki
    diageneza
    minerały ilaste
    Opis:
    The study of upper Cretaceous - lower Tertiary fluvial deposits of the Coalspur Formation in the Foothills region of west-central Alberta reveals that the distribution of early authigenic kaolinite has a well-defined relation to the sequence stratigraphic framework. In this context, it has been observed that the kaolin mineral content increases in sandstones lying below subaerial unconformities, which mark the most significant stratigraphic hiatuses and hence the sequence boundaries in fully fluvial successions. The increased abundance of authigenic kaolinite immediately below sequence boundaries may have been caused by the infiltration of meteoric water during times of subaerial erosion, resulting in the dissolution of unstable minerals (e.g., micas and feldspar) and the formation of kaolinite and secondary porosity. It is therefore suggested that the change in clay mineral assemblages in the stratigraphic section depends in part on the position of the analyzed sandstone samples relative to the sequence boundaries. In a larger context, the method of using authigenic clays to delineate depositional sequences in non-marine successions needs to be evaluated on a case-by-case basis, as the diagnostic early diagenetic minerals underlying the sequence boundary may change as a function of palaeoclimate and also as a function of late diagenetic processes.
    Źródło:
    Geologos; 2009, 15, No. 3-4; 169-180
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Factors controlling sedimentation in the Toruń-Eberswalde ice-marginal valley during the Pomeranian phase of the Weichselian glaciation: an overview
    Autorzy:
    Pisarska-Jamroży, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/94659.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    sedimentology
    depositional mechanisms
    palaeohydraulics
    heavy minerals
    sandur
    Pleistocene
    Polska
    sedymentologia
    mechanizmy depozycyjne
    paleohydraulika
    minerały ciężkie
    sandr
    plejstocen
    Polska
    Opis:
    During the Pleistocene the Scandinavian ice sheet drained huge quantities of sediment-laden meltwaters. These meltwaters supplied ice-marginal valleys that formed parallel to the front of the ice sheet. Not without significance was the supply of ice-marginal valleys from extraglacial rivers in the south. Moreover, periglacial conditions during and after sedimentation in ice-marginal valleys, the morphology of valley bedrocks, and erosion of older sediments played important roles in the depositional scenarios, and in the mineralogical composition of the sediments. The mechanisms that controlled the supply and deposition in ice-marginal valleys were analysed on the basis of a Pleistocene ice-marginal valley that was supplied by northern and southern source areas in the immediate vicinity. Investigations were conducted in one of the largest ice-marginal valleys of the Polish-German lowlands, i.e., the Toruń-Eberswalde ice-marginal valley, in sandurs (Drawa and Gwda) supplied sediments and waters from the north into this valley, and on extraglacial river terraces (pre-Noteć and pre-Warta rivers), formed simultaneously with the sandurs and ice-marginal valley (Pomeranian phase of Weichselian glaciation) supplied sediments and waters from the south into this valley. A much debated question is how similar, or different, depositional processes and sediments were that contributed to the formation of the Toruń-Eberswalde ice-marginal valley, and whether or not it is possible to differentiate mostly rapidly aggraded sandur sediments from ice-marginal valley sediments. Another question addresses the contribution of extraglacial feeding of the Toruń-Eberswalde ice-marginal valley. These matters were addressed by a wide range of analyses: sediment texture and structure, architectural elements of sediments, frequency of sedimentary successions, heavy-mineral analysis (both transparent and opaque heavy minerals), analysis of rounding and frosting of quartz grains, and palaeohydrological calculations. Additionally, a statistical analysis was used. The specific depositional conditions of distribution of sediments in ice-marginal valley allow to distinguish new environment of ice-marginal valley braided river. The spectrum of depositional conditions in the Toruń-Eberswalde ice-marginal valley and their specific palaeohydraulic parameters allow to distinguish three coexisting zones in the ice-marginal valley braided-river system: (1) deep gravel-bed braided channel zone with extensive scours, (2) deep sand-bed braided channel zone with transverse bars, and (3) marginal sand-bed and gravel-bed braided channel zone with diamicton and breccia deposition, which were characterised in detail. Some of the results have been published previously, which is why they are discussed in the present paper within the context of new data.
    Źródło:
    Geologos; 2015, 21, 1; 1-29
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Geology and genesis of vein-type corundum deposits in the Hafafit-Nugrus area, South Eastern Desert, Egypt
    Autorzy:
    Mahmoud, Soliman Abu Elatta A.
    Ali, Hani H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1841624.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    grossular
    Cr-rich spinel
    Nb-rich rutile
    ultramafic rocks
    secondary uranium minerals
    spinel
    rutyl
    minerały
    skały ultrazasadowe
    uran
    Opis:
    Unusual deposits formed by corundum are described from two separate pegmatitic veins in the Hafafit-Nugrus area of the South Eastern Desert of Egypt. Other related minerals are described too. The vein-type of corundum at Locality 1 (Vein 1) crosscuts through exposed rocks of an ophiolitic mélange, whereas at Locality 2 (Vein 2), it crosscuts through exposed serpentinised ultramafic rocks. The main minerals in Vein 1 are plagioclase, corundum, grossular, phlogopite, muscovite and clinochlore, while almandine, xenotime-(Y), allanite-(Ce), zircon, Cr-rich spinel, apatite, titanite, fergusonite-(Y), meta-ankoleite, U-rich thorite (uranothorite), carbonate and illite are the accessories. In Vein 2, the main minerals are plagioclase, corundum, phlogopite and chlorite, while clinochlore, euxenite-(Y), Nb-rich rutile, almandine, xenotime-(Y), allanite-(Ce), zircon, spinel, apatite, titanite, kasolite, dickite, illite, carbonate, antigorite and talc are accessories. The two types of corundum veins differ in their concentrations of Th, U, Zr, Nb, Ta, REE, Y and Li in wholerock compositions. Field observations, mineralogy and chemical analyses of samples from the two veins of corundum deposits, as well as concentrations of chromophore elements in corundum crystals, suggest metasomatic origins. The present study suggests that the two types of corundum veins formed at different ages from different residual magmas that underwent in-situ hybridisation with the host rocks.
    Źródło:
    Geologos; 2020, 26, 3; 181-197
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    PODATEK OD WYDOBYCIA NIEKTÓRYCH KOPALIN – NOWA JAKOŚĆ W POLSKIM PRAWIE PODATKOWYM
    TAX ON THE EXTRACTION OF CERTAIN MINERALS – A NEW QUALITY IN THE POLISH TAX LAW
    Autorzy:
    Duda, Michalina
    Powiązania:
    https://bibliotekanauki.pl/articles/693544.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    Tax on the Extraction of Certain Minerals
    copper tax
    resource rent
    podatek od wydobycia niektórych kopalin
    podatek miedziowy
    renta surowcowa
    Opis:
    On April 18, 2012, the Law on Taxation of Certain Minerals came into force. By virtue of this law, a new public levy, assumed to constitute a form of a resource rent, was introduced into the Polish law. The tax covers the extraction of two metals, namely copper and silver, and belongs to the group of levies that are imposed based on the volume of the mining output (extraction). The revenue from the new levy is supposed to constitute in its entirety the income of the state budget. According to the drafters of the law, the tax should make it possible to capture the outstanding profits of the entities that extract the metals in question. However, according to experts in the tax law and experts in the management of those resources, the structure of the levy in question raises doubts. The aim of this paper is to present the technical elements of the Tax on the Extraction of Certain Minerals and the controversies related to the introduction of this levy. It discusses the subjective and the objective scope of the tax, the taxpayers’ duties, as well as the normative structure of the tax rates and scales.
    Ustawa o podatku od wydobycia niektórych kopalin weszła w życie 18 kwietnia 2012 r.; na jej mocy do polskiego systemu prawnego wprowadzona została nowa danina publiczna – w myśl przyjętych założeń stanowić ma formę renty surowcowej. Podatek od wydobycia niektórych kopalin obejmuje wydobycie dwóch metali: miedzi i srebra. Należy do grupy danin nakładanych od wielkości urobku (wydobycia) i w całości stanowić ma dochód budżetu państwa. Zdaniem projektodawców powinien pozwolić na uchwycenie nadzwyczajnych zysków podmiotów wydobywających wskazane metale, jednakże w ocenie doktryny prawa podatkowego i ekspertów z zakresu gospodarki tymi surowcami konstrukcja przedmiotowej daniny budzi liczne wątpliwości. Celem niniejszego artykułu jest przedstawienie elementów technicznych podatku od wydobycia niektórych kopalin oraz kontrowersji, jakie wiążą się z wprowadzeniem tej daniny. W opracowaniu omówiono zakres podmiotowy i przedmiotowy podatku, obowiązki podatników, a także normatywną konstrukcję stawek i skal podatkowych.
    Źródło:
    Ruch Prawniczy, Ekonomiczny i Socjologiczny; 2013, 75, 1; 119-131
    0035-9629
    2543-9170
    Pojawia się w:
    Ruch Prawniczy, Ekonomiczny i Socjologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hazardous radioactivity levels and heavy mineral concentrations in beach sediments of Lake Peipsi, northeastern Estonia
    Autorzy:
    Järvelill, J.-I.
    Koch, R.
    Raukas, A.
    Vaasma, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/94516.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    elevated radioactivity
    risk management
    beach sediments
    heavy minerals
    Baltic States
    podwyższona radioaktywność
    zarządzanie ryzykiem
    osady plażowe
    minerały ciężkie
    kraje nadbałtyckie
    Opis:
    The present study discusses results of heavy mineral analyses and radioactivity of beach sediments of Lake Peipsi. Such analyses are commonly done globally, but had not yet been conducted for the fourth largest lake in Europe. The average heavy mineral content in Lake Peipsi beach sediments along the northern and western coast is higher than usual for Estonian coastal and Quaternary sediments. Concomitantly, elevated radioactivity levels have been measured in several places, with the highest concentrations observed at Alajõe (1885.5 Bq/kg), which is over five times more than the recommended limit. The aim of the present study is to find sites with higher radioactivity levels, because the northern coast of Lake Peipsi is a well-known recreational area.
    Źródło:
    Geologos; 2018, 24, 1; 1-12
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evolution of Early Pleistocene fluvial systems in central Poland prior to the first ice sheet advance – a case study from the Bełchatów lignite mine
    Autorzy:
    Goździk, J.
    Zieliński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/94398.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    Quaternary
    preglacial
    fluvial-aeolian interaction
    heavy minerals
    quartz grain morphology
    sedimentology
    palaeoclimate
    Czwartorzęd
    preglacjał
    minerały ciężkie
    morfologia ziarna kwarcu
    sedymentologia
    paleoklimat
    Opis:
    Deposits formed between the Neogene/Pleistocene transition and into the Early Pleistocene have been studied, mainly on the basis of drillings and at rare, small outcrops in the lowland part of Polish territory. At the Bełchatów lignite mine (Kleszczów Graben, central Poland), one of the largest opencast pits in Europe, strata of this age have long been exposed in extensive outcrops. The present paper is based on our field studies and laboratory analyses, as well as on research data presented by other authors. For that reason, it can be seen as an overview of current knowledge of lowermost Pleistocene deposits at Bełchatów, where exploitation of the Quaternary overburden has just been completed. The results of cartographic work, sedimentological, mineralogical and palynological analyses as well as assessment of sand grain morphology have been considered. All of these studies have allowed the distinction of three Lower Pleistocene series, i.e., the Łękińsko, Faustynów and Krzaki series. These were laid down in fluvial environments between the end of the Pliocene up to the advance of the first Scandinavian ice sheet on central Poland. The following environmental features have been interpreted: phases of river incision and aggradation, changes of river channel patterns, source sediments for alluvia, rates of aeolian supply to rivers and roles of fluvial systems in morphological and geological development of the area. The two older series studied, i.e., Łękińsko and Faustynów, share common characteristics. They were formed by sinuous rivers in boreal forest and open forest environments. The Neogene substratum was the source of the alluvium. The younger series (Krzaki) formed mainly in a braided river setting, under conditions of progressive climatic cooling. Over time, a gradual increase of aeolian supply to the fluvial system can be noted; initially, silt and sand were laid down, followed by sand only during cold desert conditions. These fluvio-periglacial conditions are identified in the foreground of the advance of the oldest ice sheet into this part of central Poland. The series studied have been compared with other fluvial successions which accumulated in the Kleszczów Graben during subsequent glaciations so as to document general changes in fluvial systems as reactions to climatic evolution. Thus, a palaeoenvironmental scenario has emerged which could be considered to be characteristic of central Poland during the Early Pleistocene.
    Źródło:
    Geologos; 2017, 23, 2; 89-107
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Heavy minerals as a tool to reconstruct river activity during the Weichselian glaciation (Toruń Basin, Poland)
    Autorzy:
    Weckwerth, Piotr
    Chabowski, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/94678.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    heavy minerals
    ice-marginal valley
    river-discharge regime
    channel-pattern transformation
    Toruń Basin
    Weichselian
    ciężkie minerały
    pradolina
    dorzecze Torunia
    zlodowacenie północnopolskie
    Opis:
    The heavy-mineral composition of the Weichselian fluvial successions deposited by an ephemeral meandering river and by a sand-bed braided river in the Toruń Basin (central Poland) was analysed. On the basis of a lithofacies analysis, in combination with the composition of the heavy-mineral assemblages, the fluvial processes and river-channel morphology were reconstructed. This allows determining the provenance of the fluvial deposits and the rivers’ discharge regimes. A model is proposed which can explain the changes in the amount of individual minerals in the fluvial sediments of different ages under the conditions of the oscillating Scandinavian ice sheet. The model assumes that, during the ice-sheet advances, the proglacial streams supplied large amounts of heavy minerals that were less resistant to mechanical abrasion. During the main phase of the ice-sheet retreat, the distance between the ice sheet and the Toruń Basin increased, and the amount of non-resistant minerals diminished as a result of sediment reworking in proglacial rivers. Due to the unique location of the Toruń Basin at the front of the Scandinavian ice sheet during the Weichselian glaciation, the heavy-mineral assemblages in the fluvial deposits form a valuable tool for the recognition of the ice-sheet extent.
    Źródło:
    Geologos; 2013, 19, No. 1-2; 25-46
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Heavy and light minerals as a tool for reconstructing depositional environments: an example from the Jałówka site (northern Podlasie region, NE Poland)
    Autorzy:
    Woronko, Barbara
    Rychel, Joanna
    Karasiewicz, Mirosław T.
    Ber, Andrzej
    Krzywicki, Tomasz
    Marks, Leszek
    Pochocka-Szwarc, Katarzyna
    Powiązania:
    https://bibliotekanauki.pl/articles/94625.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    heavy minerals
    quartz grain
    periglacial processes
    source deposits
    Vistulian glaciation
    NE Poland
    minerały ciężkie
    ziarna kwarcu
    procesy peryglacjalne
    złoża źródłowe
    zlodowacenie Wisły
    Polska północna
    Opis:
    Part of northern Podlasie (NE Poland), shaped during the Wartanian stadial of the Odranian glaciation (Saalian), was situated in the periglacial zone during the Vistulian (Weichselian) glaciation. Both landforms and sediments were affected by the periglacial conditions. This is recorded at the Jałówka site, at the floor of a dry valley, where mineral deposits of 4.13 m thick, overlying organic deposits from the Eemian interglacial, were examined. These mineral deposits form four units, from bottom to top: a fluvial unit (I), a loess-like unit (II), a solifluction unit (III), and an aeolian unit with ice wedges (IV) on top of unit III. The heavy and light minerals were analysed, as well as the geochemistry, in order to find out about the parent material and to reconstruct the climatic conditions during deposition. The mineral analysis indicates that the Saalian till was predominantly derived from shallow-marine deposits; erosion accompanied by sorting of the heavy minerals took place on the basis of their mass and grain size. The original material of the till seems therefore to be sedimentary rocks from the eastern Central Baltic Basin. This material became strongly weathered under the periglacial conditions, resulting in the destruction of the quartz grains, as well as in leaching, leading to complete decalcification of the deposits. Aeolian activity resulted in infilling of ice wedges and the creation of thin layers. The intensity and the duration of these processes was limited, so that the effects of the aeolian abrasion are insignificant. Neither resulted the aeolian activity in significant reshaping of the landscape.
    Źródło:
    Geologos; 2013, 19, No. 1-2; 47-66
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Iron-bearing phases affecting the colour of upper Neogene clayey sediments from Dymaczewo Stare, west-central Poland
    Autorzy:
    Klęsk, Jakub
    Błachowski, Artur
    Diduszko, Ryszard
    Kruszewski, Łukasz
    Widera, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/2204349.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    mineral composition
    powder X-ray diffraction
    PXRD
    iron minerals
    57Fe Mössbauer spectroscopy
    57Fe- MS
    Poznań clays
    Mio-Pliocene
    skład mineralny
    proszkowa dyfrakcja rentgenowska
    minerały żelaza
    spektroskopia Mössbauera
    iły poznańskie
    Opis:
    The present paper investigates the colour dependence of mineral compositions in clay-rich sedimentary strata, mainly clayey silts, the emphasis being on iron-bearing minerals (rather than clay minerals) by using powder X-ray diffraction (PXRD) and 57Fe Mössbauer spectroscopy (57Fe-MS). The PXRD-based phase analysis has demonstrated the variable compositions of samples, consisting of, inter alia, quartz, calcite or gypsum, and admixtures of potassium feldspars and plagioclase. Hematite + goethite (sample D1, dark red), goethite (sample D2, pinkish brown), poorly crystalline goethite (sample D3, orange) and jarosite (sample D4, yellow) have been distinguished. A very low jarosite content was detected in sample D5 (light grey); this did not affect its colour. The potential yellow/brown shades in sample D6 (dark grey), coming from trace amounts of jarosite, are masked by macroscopically visible organic matter. In the case of the two last-named samples (D5 and D6), with trace amounts of Fe-bearing minerals, it is most likely that the organic matter was effective in influencing the light and dark grey colour of the sediment, respectively.
    Źródło:
    Geologos; 2022, 28, 2; 129--139
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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