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Geology, geochemistry and age of a Cu-Mo-bearing granite at Kabeliai, southern Lithuania

Geologie, Geochemie und Alter des Cu-Mo führenden granites von Kabeliai, südliches Litauen

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Summary

A Cu-Mo-bearing granitoid belonging to the concealed Precambrian crystalline basement of Lithuania has been dated by the U-Pb zircon method and investigated geochemically. chemically. The granitoid is located at Kabeliai in southernmost Lithuania and forms part of a granitoid complex recognized as the Marcinkonys batholith. The Kabeliai granite is composed of quartz, plagioclase, microcline and biotite and shows a granitic to adamellitic peralummous/metaluminous composition with dominantly I-type chemistry. U-Pb dating of zircon yields an age of 1505 ± 11 Ma, which is considered to reflect the crystallization age of the granite.

The Kabeliai granite displays several similarities in terms of geological setting, chemistry and age with certain granitoids in northeastern Poland (Mazury complex) and northwestern Belorussia (Mostovsky, Kamensky and Vydgodsky plutons), which are considered “rapakivi-like” in the literature. It is, however, uncertain whether proper rapakivi granites really exist in these areas as none of these granitoids displays the common characteristics of rapakivi granites (A-type chemistry, wiborgitic textures, associated Sn-Be-Pb-Zn-Cu mineralizations). We speculate that the 1.4-1.5 Ga granites southeast of the Baltic Sea rather might be correlated with granites of comparable age and geochemical character in southwestern Sweden. Another possible alternative is that the granitoids in Lithuania may not be correlated with any part of the Fennoscandian Shield.

Zusammenfassung

Ein Cu-Mo-führender Granitoid, der zum präkambrischen, kristallinen Grundgebirge Litauens gehört, wurde mittels der U-Pb Methode an Zirkonen datiert und geochemisch untersucht. Der Granit repräsentiert einen Teil des Marcinkonys Batholithes, und tritt in Kabeliai, im südlichsten Litauen auf. Der Kabeliai Granit besteht aus Quarz, Plagioklas, Mikroklin und Biotit und zeigt adamellitische, peraluminöse/metaluminöse Zusammensetzung mit vorwiegend 1-Typ Charakter auf. U-Pb Datierung der Zirkone ergibt ein Alter von 1505 ± 11 Mio Jahren, das als Kristallisationsalter anzusehen ist.

In seinem geologischen mit Granitoiden im nordöstlichen Polen (Mazury Komplex) und Grant Ånlichkeiten mit Granitoiden im nordöstlichen Polen (Mazury Komplex) und Grant Ånlichkeiten mit Granitoiden im nordöstlichen Polen (Mazury Komplex) und im nordwestlichen Weißrussland (Mostovsky, Kamensky und Vydgodsky Plutone), die in der Literatur als “Rapakivi-ähnlich” angesehen werden. Es ist jedoch unischer ob echte Rapakivi-Granite in diesen Regionen existieren. Keiner dieser Granite zeigt nämlich die für Rapakivi-Granite typischen Kennzeichen (A-Typ Chemie, Wiborgit Texturen, assoziierte Sn-Be-Pb-Zn-Cu-Mineralisationen). Wir vermuten, daß die 1.4 1.5 Mia Jahren alten Granite südöstlich der Ostsee eher mit Graniten ähnlichen Alters und von ähnlichem geochemischen Charakter im südwestlichen Schweden zu vergleichen sind. Eine weitere Alternative wäre, daß die Granitoide Litauens mit keinem Granit im Fennoskandischen Schild korreliert werden können.

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Author notes

  1. K. Sundblad & J. Mansfeld

    Present address: Department of Geology and Geochemistry, Stockholm University, Stockholm, Sweden

Authors and Affiliations

  1. Department of Geology and Geochemistry, Stockholm University, Stockholm, Sweden

    M. Ahl

  2. Lituanian Geological Institute, Sevčenkos 13, Vilnius, Lithuania

    G. Motuza

  3. Swedish Museum of Natural History, S-104 05, Stockholm, Sweden

    J. Mansfeld &  S. Claesson

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  3. G. Motuza
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  4. M. Ahl
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Sundblad, K., Mansfeld, J., Motuza, G. et al. Geology, geochemistry and age of a Cu-Mo-bearing granite at Kabeliai, southern Lithuania. Mineralogy and Petrology 50, 43–57 (1994). https://doi.org/10.1007/BF01160138

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