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    Wyświetlanie 1-3 z 3
    Tytuł:
    Geochemistry and ore potential of the Almoughlagh batholith, western Iran
    Autorzy:
    Zamanian, Hassan
    Asadollahi, Behrooz
    Powiązania:
    https://bibliotekanauki.pl/articles/94586.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    Fe-skarn mineralisation
    Almoughlagh batholith
    metaluminous
    geochemistry
    skarn ore potential
    Baba Ali pluton
    geochemia
    Baba Ali
    Almoughlagh
    Opis:
    The Almoughlagh batholith intruded the dioritic Baba Ali pluton during the Oligo-Miocene; the pluton and is now exposed as a big enclave within the batholith. The pluton intruded the Songhor Series during the Late Kimmeridgian (~136 Ma) orogeny. The intrusion by the batholith transformed the diorite to metadiorite and the impure carbonate units of the Songhor Series. The batholith consists of rock types such as quartz syenite and syenogranite, which have a low average quartz content, and which are metaluminous to peraluminous and calc-alkaline in composition. Comparison of the compositions of the Almoughlagh batholith and the pluton with its Cu, Mo, Fe, Sn, W, Au, and Zn skarn deposits, indicates that the Baba Ali diorite geochemically shows much resemblance with those which could bring about Fe-Cu skarn mineralization, whereas the compositions of the Almoughlagh granitoids resembles those of the plutons associated with Mo and Zn skarn deposits. The associated hydrothermal activity related to the Almoughlagh batholith culminated in magnetite mineralisation in the Baba Ali and the Chenar mines in which copper mineralisation also is considerable.
    Źródło:
    Geologos; 2013, 19, 3; 229-242
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The auriferous ore mineralisation and its zonal distribution around the Variscan Kłodzko–Złoty Stok granitoid pluton in the Sudetes (SW Poland) – an overview
    Autorzy:
    Mikulski, S. Z.
    Speczik, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059951.pdf
    Data publikacji:
    2016
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    gold
    ore mineralisation
    skarn
    Variscan granitoids
    Kłodzko–Złoty Stok pluton
    Sudetes
    Opis:
    Due to a low level of erosion the Variscan (Carboniferous–Mississippian) Kłodzko–Złoty Stok (KZS) granitoid pluton and its metamorphic rock cover are unique examples of the ore mineralisation distribution pattern around a pluton. The KZS pluton formed from I-type magmas. It is composed mostly of high-K, metaluminous, biotite- and hornblende-rich granitoids of various compositions ranging from granodiorite to monzonite. The ore mineralisation in the KZS shows specific zonation that reflects interaction between post-magmatic mineralising fluids and country rocks of different composition. In the KZS pluton and its surroundings the mineralisation reveals high-temperature Ti-W oxides and As-Fe sulphide-arsenides plus Fe-oxides which are replaced outwards by Cu-Fe-Pb-Zn sulphides and subsequently, in the marginal parts of the pluton, by the Pb-Sb-Fe sulphide mineralisation. The specific elements and the isotopic composition of sulphur in ore minerals indicate that the metal-bearing postmagmatic-metamorphic hydrothermal fluids, despite their strong affinities to the KZS hybrid magmatic fluids, show also an influence of variable composition of country rocks. Variable alteration processes: hornfelsitisation, skarnisation, dolomitisation, serpentinitisation, pyroxenisation, biotitisation, K-feldspatisation, silicification, berezitisation, carbonatisation, prehinitisation, chloritisation, epidotisation, sericitisation, albitisation and sulphidisation developed along contacts of various rock types within the country rocks. In more fractured zones, transported elements were preferentially trapped by calcareous (Ca-rich) metamorphic rocks. Moreover, along the direct contact between granitoids and calcareous rocks a high temperature auriferous skarns with magnetite-pyrrhotite or/and löllingite-arsenopyrite mineralisation were formed. There are positive correlations between organic matter and Fe2O3 and MgO contents in skarns, suggesting remobilization of organic matter by hydrothermal fluids released during serpentinisation. The organic matter and carbonate samples have very variable δ13C and δ18O values. Most probably these are the result of isotopic re-equilibration between minerals under high temperatures. On the intimate contact of granitoids with less permeable amphibolitic hornfelses a high temperature titanite-scheelite mineralisation of veinlet-impregnation type occurred, while thermal and metasomatic alteration of the enveloping more permeable sandstones developed away from direct contact with granites, causing the formation of pyrite-rich beresites. As a rule, different types of sulphide ore mineralisation contain refractory gold captured by arsenopyrite, löllingite and/or pyrite. Moreover, the formation of contact-metasomatic ore mineralisation was accompanied by ore precipitation in veins and stockworks at a wide temperature range from 480 to 150°C during early and late fracturing stages. The younger stages also revealed variable concentration of gold. All those observations strongly indicate that the whole KZS pluton and its aureole was fertile in gold.
    Źródło:
    Geological Quarterly; 2016, 60, 3; 650--674
    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 1-3 z 3

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