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    Tytuł:
    Wyniki mineralogicznych i geochemicznych badań ewaporatów ze złoża Taudenni-Agorgott (Mali, Sahara Zachodnia)
    Results of mineralogical and geochemical investigation of evaporates from the Taoudenni-Agorgott deposit (Mali, Western Sahara).
    Autorzy:
    Pająk, J.
    Pawlikowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/344097.pdf
    Data publikacji:
    2013
    Wydawca:
    nakł. Maciej Pawlikowski
    Tematy:
    Sahara Desert
    evaporates
    mineralogy
    Taoudenni
    Mali
    halite
    Opis:
    Field as well as mineralogical and geochemical investigation of evaporates of Taoudenni-Agorgott deposit were performed. It was stated out that the profile is composed of halite, glauberite, gypsum, carbonates, quartz and clay minerals. The sequence of the presence of minerals at the profile suggests the deposit is the result of evaporation of salty lake during drying of climate at the Sahara Desert. Mineral composition of evaporates suggest that Na-Cl reach like evolved to Na-Ca-SO4 phase and next was fully evaporated and coated with detrital sediments.
    Źródło:
    Auxiliary Sciences in Archaeology, Preservation of Relics and Environmental Engineering; 2013, 16; 1-18
    1689-6742
    Pojawia się w:
    Auxiliary Sciences in Archaeology, Preservation of Relics and Environmental Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sedimentological and micropalaeontological evidence to elucidate post-evaporitic carbonate palaeoenvironments of the Saudi Arabian latest Jurassic
    Autorzy:
    Hughes, G.
    Naji, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/2061333.pdf
    Data publikacji:
    2008
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Saudi Arabia
    Tithonian
    Hith Firmation
    Manifa Reservoir
    micropalaeontology
    evaporates
    carbonates
    Opis:
    The Hith Formation forms the youngest lithostratigraphic unit of the Jurassic Shaqra Group. It represents the culmination of a succession of hypersaline and euryhaline cycles that characterise the Late Jurassic of Saudi Arabia. The Formation is poorly exposed in central Saudi Arabia, but it has been studied in detail in subsurface eastern Saudi Arabia where the upper carbonate member hosts an important hydrocarbon reservoir called the Manifa Reservoir. Chronostratigraphic control is absent from the formation itself, and the Tithonian age is suggested for the Hith Formation based on its stratigraphic position between the underlying Arab Formation of Late Kimmeridgian age, and the overlying Sulaiy Formation, of Late Tithonian to Berriasian age. The Hith Formation needs redefining in the light of new lithological evidence, and a tripartite member scheme is suggested. This includes the lower anhydrite-dominated member here termed the “anhydrite” member, and considered to represent hypersaline subaqueous deposition within a restricted deep lagoon during the lowstand systems tract of the Manifa sequence. A “transitional“ member consists of interbedded anhydrites and carbonates and approximates with the transgressive zone. The overlying “carbonate” member represents the results of a prograding shallow, normal salinity marine succession related to the highstand systems tract. Interbedded carbonates within the evaporites are interpreted to represent superimposition of a higher frequency, possibly 4th order eustatic cyclicity. The “carbonate“ member hosts the Manifa Reservoir, and here proposed as the Manifa Member, consist of five parasequences, each of which represents a shoaling-upwards cycle with a succession of up to five repeated lithofacies and biofacies that commences with a stromatolitic, microfaunally-barren unit followed by fine-grained grainstones with a monospecific but abundant ostracod biofacies. A succession of coarse pelloidal grainstones with rare foraminifera, including Redmondoides lugeoni, Trocholina alpina with a variety of unidifferentiated valvulinids and miliolids then follows, that passes vertically into coarse ooid grainstones, with rare Redmondoides lugeoni, forming the uppermost part of each parasequence.
    Źródło:
    Volumina Jurassica; 2008, 6, 1; 61-73
    1896-7876
    1731-3708
    Pojawia się w:
    Volumina Jurassica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pochodzenie stylolitów w gipsach z czapy wysadu solnego Wapna
    Origin of stylolites in gypsum cap rock of Wapno Salt Dome (NW Poland)
    Autorzy:
    Jaworska, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2074477.pdf
    Data publikacji:
    2006
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    stylolit
    czapa gipsowa
    wysad solny
    stylolites
    evaporates
    gypsum cap rock
    Zechstein
    detached block
    Wapno Salt Dome
    Opis:
    Stylolites have been found in a core sample from the gypsum cap rock of the Wapno salt dome (figs 1-3) at a depth of 40 m below the land surface. These structures are inclined at 40-45ş to the core axis and cut by neomorphic gypsum crystals. Stylolites are products of the solution pressure. They commonly occur in carbonates but are very rarely encountered in evaporates, thus the origin and preservation of these structures in the cap rock of Wapno dome are interesting problems. Lithostatic pressure near the surface where the cap rock has been formed is insufficient to develop stylolites. Thus stylolites (fFigs 4-5) in gypsum cap rock of the Wapno salt diapir are probably early diagenetic structures preserved in a fragment of Zechstein anhydrite of Z2 or Z3 cyclothems. This anhydrite block with stylolites have been carried inside intruding salt masses to the top ofWapno dome. Halite and other easy soluble minerals had been dissolved, but the anhydrites with preserved stylolites have been incorporated in the cap rock and secondary altered into gypsum, similarly to the phenomenon found in Gorleben Salt Dome by Bäuerle et al. (2000).
    Źródło:
    Przegląd Geologiczny; 2006, 54, 2; 166-169
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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