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    Wyświetlanie 1-9 z 9
    Tytuł:
    Ordovician seawater composition : evidence from fluid inclusions in halite
    Autorzy:
    Meng, F.
    Zhang, Y.
    Galamay, A. R.
    Bukowski, K.
    Ni, P.
    Xing, E.
    Ji, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059770.pdf
    Data publikacji:
    2018
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Ordovician
    fluid inclusions
    halite
    seawater composition
    calcite sea
    Opis:
    Fluid inclusions in halite can directly record the major composition of evaporated seawater; however, Ordovician halite is very rare. The Ordovician is a key time during the evolution history because profound changes occurred in the planet’s ecosystems. Marine life was characterized by a major diversification, the Great Ordovician Biodiversification Event and the Late Ordovician Mass Extinction, the first of the “big five” mass extinctions. However, so far there is no data on the Ordovician seawater. Data from the Ordovician-Silurian boundary were available only. In this study, we report the major compositions from Middle Ordovician halite in China to give the exact composition of Ordovician seawater. The basic ion composition (K+, Mg2+, Ca2+, and SO42-) of inclusion brines was established with the use of ultramicrochemical analysis. The data on the chemical composition of the brines in the primary inclusions indicated that the brines were of Na-K-Mg-Ca-Cl (Ca-rich) type, and cover a huge gap in the evolution of seawater chemistry. The chemical composition of the primary inclusion brine in halite confirmed the earlier results for the Cambrian and Silurian halite originating from other salt basins and the previous speculation of “calcite sea” during the Ordovician, indicating a higher potassium content in the Lower Paleozoic seawater than in the seawater of other periods of the Phanerozoic.
    Źródło:
    Geological Quarterly; 2018, 62, 2; 344--352
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fluid inclusions in halite from marine salt deposits: are they real micro-droplets of ancient seawater?
    Autorzy:
    Kovalevych, V.
    Vovnyuk, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059036.pdf
    Data publikacji:
    2010
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    marine salt deposits
    halite
    fluid inclusions
    seawater chemistry
    Opis:
    Evaluation of data sets on inclusion brine compositions in halite from the Phanerozoic marine evaporite deposits used for the reconstruction of ancient seawater chemistry shows that brine analysis of primary inclusions from primary marine halite (in the case of proper genetic type determination) undoubtedly indicate two megacycles in secular variation of seawater chemistry during the Phanerozoic. It is also shown that inside primary halite, inclusions formed at later stages of deposit formation locally occur. Erroneous attribution of such inclusions to primary ones is the main reason for deviations observed in most data sets. It is also obvious that fluid inclusions in clear (recrystallized) halite are unsuitable for the reconstruction of ancient seawater chemistry. Brines from inclusions properly determined as primary in primary bedded halite are micro-droplets of concentrated ancient seawater.
    Źródło:
    Geological Quarterly; 2010, 54, 4; 401-410
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calculation of salt basin depth using fluid inclusions in halite from the Ordovician Ordos Basin in China
    Autorzy:
    Galamay, Аnatolіy R.
    Meng, Fanwei
    Bukowski, Krzysztof
    Lyubchak, Aleksandr
    Zhang, Yongsheng
    Ni, Pei
    Powiązania:
    https://bibliotekanauki.pl/articles/2058592.pdf
    Data publikacji:
    2019
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    halite
    gas-liquid inclusion
    brine depth
    Ordos Basin
    Ordovician evaporate
    Opis:
    During the Middle Ordovician, the salt deposits of the Majiagou Formation of the Ordos Basin in North China formed, the halite including various genetic types of fluid inclusion. In this study, fit-testing of primary inclusions was performed to reconstruct the physical and chemical conditions during original halite sedimentation. During the post-sedimentation stage, salt was subjected to elevated temperatures (62-70°C) and pressures of tens of megapascals. From these measurements and mathematical calculations, the gas pressure was identified in the primary fluid inclusions, which allowed us to estimate that the brine column thickness in the salt basin was approximately 40 m.
    Źródło:
    Geological Quarterly; 2019, 63, 3; 619--628
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Migration of palaeofluids in the contact zone between the Dukla and Silesian units, Western Carpathians - evidence from fluid inclusions and stable isotopes in quartz and calcite
    Autorzy:
    Jarmołowicz-Szulc, K.
    Dudok, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/2058916.pdf
    Data publikacji:
    2005
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Carpathians
    quartz
    Marmarosh diamonds
    fluid inclusions
    hydrocarbons
    Opis:
    This study reconstructs the type and migration history of fluids within the Cretaceous-Paleogene rocks of the Silesian and Dukla units in the border area of the Polish and Ukrainian Carpathians. Quartz (the “Marmarosh diamonds”), calcite and organic matter fill fractures in the sedimentary rocks of the Tertiary accretionary prism of the Carpathian thrust units. The calcite and quartz contain numerous solid, liquid and gaseous inclusions. Generally two types of fluids are distinguished — aqueous and hydrocarbon. Homogenisation temperatures of hydrocarbons in quartz range from -128 to + 85°C. Hydrocarbon fluids contain light (methane) and heavier (oil) compounds. Aqueous inclusions generally display homogenisation temperatures between 110 and 230°C. The δI3CPBD values for calcite range from -3.5to +2.9%o, while the δI8Osmow range from 18.9 to 27.7%o. The 8I8OSMOwvalues for quartz range from 15.7 and 26.7%o. Fluidinclu- sions indicate that maximum pressures and temperatures occur at the early development of the vein mineralization. They vary from 2.4 to 2.7kbarin the Krosno (Silesian) Unit and from1.7to 1.9kbarinthe Dukla Unit at 190-230°C. The crystallisation of the “Marmarosh diamonds” in the NW part of the study area occurred at lower P-T conditions of 0.9 kbar and 110-175°C. Generally, the migrating fluids are represented by a mixture ofthe low salinity aqueous and the hydrocarbon-rich fluids.
    Źródło:
    Geological Quarterly; 2005, 49, 3; 291-304
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hydrocarbon and aqueous inclusions in minerals: a review of analyses and interpretations for Paleozoic rocks in Poland
    Autorzy:
    Jarmołowicz-Szulc, Katarzyna
    Powiązania:
    https://bibliotekanauki.pl/articles/2058676.pdf
    Data publikacji:
    2021
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    fluid inclusions
    hydrocarbons
    Paleozoic
    Baltic Sea
    Polish Lowlands
    Opis:
    Two decades of microthermometric studies of fluid inclusions within cements of Paleozoic sedimentary rocks in Poland are reviewed. The inclusions contain palaeofluids of variable composition: aqueous, brine, and hydrocarbon. They may be primary and/or secondary in origin and have one, two or more phases. They display visual fluorescence in blue, sometimes yellow to red (oil) or dull blue (one phase, methane) colours, or do not fluoresce at all. Based on the fluorescence characteristics in ultraviolet light, the inclusions' hydrocarbons infill character may be estimated. The homogenization temperatures, which correspond to the minimum estimate of the trapping temperatures in the minerals, show variability in respect to the geological history of the area studied. They point to different geological stages in relation to the basin's burial evolution. Microthermometric analyses enable wider interpretation due to the combination of studies of both hydrocarbon and aqueous inclusions. The presence of oil and/or gas in inclusions is proof of the occurrence and/or migration of oil and gas in the rocks of a region.
    Źródło:
    Geological Quarterly; 2021, 65, 4; 158--176
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evidence of high-temperature rock salt transformations in areas of occurrence of borate minerals (Zechstein, Kłodawa salt dome, Poland)
    Autorzy:
    Toboła, T. T.
    Wachowiak, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059366.pdf
    Data publikacji:
    2018
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Zechstein
    salt deposit
    hydrothermal conditions
    borates
    fluid inclusions
    Opis:
    Occurrences of borate minerals in the Zechstein salt-bearing deposits of the Kłodawa salt dome (central Poland), and the manner of their development, suggest that the minerals were formed at high temperatures, that considerably exceed the temperature estimated from the thermal gradient (~180°C). Research on rock salt and potassium-magnesium salts containing congolite and boracite, respectively, are consistent with high-temperature processes of transformations affecting the salt rocks in certain sections of the salt dome. The chemical composition of, and daughter minerals occurring in, primary fluid inclusions in halite, originating from the congolite zone, indicated a very high proportion of potassium and magnesium in the brines from which the halite crystallised. The thermal transformations observed in inclusions indicate a halite crystallisation temperature exceeding 420°C. Anhydrite crystals, co-occurring with borate minerals, represent unique features as to the distribution and composition of solid and fluid inclusions. These features indicate crystallisation or recrystallisation in conditions that differed considerably from those typical of the salt dome, with the involvement of solutions of changing chemical compositions. The crystals contain multiple solid inclusions of transparent and non-transparent minerals, among which we have focused on carnallite. The relationships of carnallite with liquid and gaseous phases indicate, as in the congolite zone, migration of very highly concentrated brines with respect to potassium and magnesium, or even transport of carnallite in the form of melt (liquid). Measurements of fluid inclusion homogenization temperatures, within the range from 197.8 to 473.8°C, supported a high-temperature origin for these minerals in hydrothermal conditions.
    Źródło:
    Geological Quarterly; 2018, 62, 1; 134--145
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The relationship of brine chemistry of the Pennsylvanian Paradox Evaporite Basin (southwestern USA) to secular variation in seawater chemistry
    Autorzy:
    Petrychenko, O. Y.
    Williams-Stroud, S.
    Peryt, T. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2058982.pdf
    Data publikacji:
    2012
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Pennsylvanian
    Paradox Basin
    evaporites
    fluid inclusions
    seawater chemistry
    Opis:
    To establish the brine chemistry associated with the evaporites in the Pennsylvanian Paradox Basin of southeastern Utah and southwestern Colorado (USA), the composition of primary fluid inclusions was determined for sedimentary halite from two drill cores, one near the central part of the basin (Shafer Dome No. 1) and one from a more marginal location of the basin (Gibson Dome No. 1). Chemical analysis of halite fluid inclusions was done on six samples from three different evaporite cycles of the Paradox Formation; cycle 10 in the Shafer Dome core and cycles 6 and 18 from the Gibson Dome core. The inclusions that range in size from 2 to 80 microns across, were analyzed using the Petrychenko method. Large inclusions (40 to 80 microns across) that were used for the chemical analyses contain one fluid phase with a carnallite or sylvite daughter crystal. Also reported in this study are fluid inclusion homogenization temperatures for sylvite or carnallite from primary halite crystals in the Gibson Dome core and in Shafer Dome. The relationship between K+ and Mg2+ in chloride rich inclusions corresponds to their proportion in MgSO4-depleted marine waters concentrated to the stage of carnallite deposition. A correlative relationship was observed between K+2+4-rich to MgSO4-poor compositions that have been proposed by other workers. A transition from MgSO4-rich to MgSO4-poor seawater composition may have occurred between Pennsylvanian and Permian times. This paper presents a possible alternate explanation to those already proposed in the literature, that the Paradox Formation mineralogy resulted from an intermediate seawater composition that records the global transition from MgSO4-rich to MgSO4-poor seawater.
    Źródło:
    Geological Quarterly; 2012, 56, 1; 25--40
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Temperature and isotopic relations in carbonate minerals in the Middle Jurassic sideritic rocks of central and southern Poland
    Autorzy:
    Jarmołowicz-Szulc, K.
    Kozłowska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060537.pdf
    Data publikacji:
    2016
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    fluid inclusions
    isotopes
    carbonate minerals
    sideritic rocks
    Middle Jurassic
    Opis:
    The present study assesses the physico-chemical character of the fluids responsible for the genesis of carbonate minerals in the Middle Jurassic sideritic rocks at the northeastern margin of the Holy Cross Mts. and in the Częstochowa region. These rocks occur at present at depths between 30 and 600 m. Fluid inclusion and isotopic analyses have been performed in the carbonate minerals from sideritic sandstones, clayey siderites and sideritic coquinas. Siderite is the main carbonate mineral of the sideritic rocks. Calcite and ankerite are also present. The siderite is represented by two varieties, Mg-rich siderite (sideroplesite, less commonly – pistomesite) and siderite. Two generations of siderite have been distinguished – an early and a late one. The early siderite was formed at temperatures of about 20°C in the zone of microbiological methanogenesis from marine waters with some influence of meteoric waters (δ18O from –7.84 to –1.92‰ VSMOW). The late siderite crystallized at temperatures of about 62–110°C from pore waters enriched in 18O (δ18O >0‰ VSMOW) as compared with the isotopic composition of the waters responsible for the early siderite generation. The conducted fluid inclusion analyses point to formation of the cements from complex fluids of brine and carbon dioxide character, with densities slightly exceeding 1 g/cm3 and salinities varying from 10.5 to 16.9 wt.% NaCl eq. and from 6.4 to 14.0 wt.% NaCl eq. in the Holy Cross Mts. and in the Częstochowa region, respectively. The homogenization temperatures lie in the intervals of 62–110°C and 60–97°C, respectively and represent elevated values compared with data from the Polish Lowlands. Apart from burial, other heat sources must have been important for the lithogenesis of the Middle Jurassic deposits.
    Źródło:
    Geological Quarterly; 2016, 60, 4; 881-892
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Geochemistry of skarn and porphyry deposits in relation to epithermal mineralization in the Arasbaran metallogenic zone, NE Tabriz, Iran
    Autorzy:
    Alavi, Ghafour
    Radmard, Kaikhosrov
    Zamanian, Hassan
    Hosseinzadeh, Mohammad Reza
    Khalaji, Ahmad Ahmadi
    Powiązania:
    https://bibliotekanauki.pl/articles/2058563.pdf
    Data publikacji:
    2020
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Arasbaran metallogenic zone
    porphyry deposits
    skarn deposits
    epithermal deposits
    fluid inclusions
    Iran
    Opis:
    The Arasbaran metallogenic zone in northern Iran is part of the Alborz-Azerbaijan magmatic zone, which developed along the southern margin of Eurasia during the Early Mesozoic-Late Cenozoic. This region hosts precious and base metal mineralization, including porphyry, skarn, and epithermal copper, molybdenum, and gold deposits. Rare earth element variations across all the deposits are similar, indicating a similar source for these elements. The north-west trending belt comprising the Nabijan to the Sonajil deposits consistently shows chiefly alkaline conditions of formation. Fluid inclusion studies indicate that both high and low temperature hydrothermal fluids participated in the formation of all of the deposits. The mineralization age decreases from north to south and east to west and, although metal zonation is complex, the Cu-Au association post-dated the Cu-Mo mineralization reflecting that the ore fluid evolved in terms of both cooling and chemical changes due to fluid-fluid and fluid-rock interactions. In this region most deposits record a concentric zonation, with the centres preserving porphyry and skarn deposits and deposits becoming progressively epithermal toward the outer parts of the mineralizing system. According to this, the mineralization age decreases from the porphyry and skarn deposits to the epithermal deposits. The homogenization temperature and salinity both decrease from the centre to the outer zone. The pattern of homogenization temperature zonation, which is concordant with salinity zonation, suggests that fluids migrated up-dip and towards the margins of the zonation system.
    Źródło:
    Geological Quarterly; 2020, 64, 1; 141--164
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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