Zircon U-Pb ages of granitoid apophyses in the western part of the kłodzko-złoty Stok Granite Pluton (SW Poland)

Stanisław Zbigniew Mikulski, Ian Stuart Williams

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    9 Citations (Scopus)

    Abstract

    Granitoids from the Graniec–Bardo and Myszak apophyses of the Kłodzko–Złoty Stok (KZS) Granite Pluton that intrude the Upper Paleozoic flysch of the Bardo Unit havezir con U-Pb ages, measured by SHRIMP, of 341.6 ± 2.8 Ma and 341.4 ± 2.2 Ma, respectively. These results augment our previous dating that recorded a short period of Middle Mississippian (Visean) hypabyssal magmatism that produced a variety of KZS igneous rocks of different compositions between ca. 341 and 331 Ma. The Graniec–Bardo and Myszak apophyses belong to the earliest stage of the pluton emplacement. Geochemical and petrographic studies of the dated samples indicate that they are biotite- and hornblende-rich tonalite and syenogabbro of diverse composition and typical of rocks originating from hybrid magmas formed in the geotectonic transition from an early stage collisional granitoid emplacement to its fast orogenic uplift. The polymetallic auriferous ore mineralisation of contact metasomatic type found in intimate contact with the Graniec–Bardo apophysis near Bardo Şląskie may also be of Visean age.

    Original languageEnglish
    Pages (from-to)251-262
    Number of pages12
    JournalGeological Quarterly
    Volume58
    Issue number2
    DOIs
    Publication statusPublished - 2014

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