TY - JOUR

T1 - Geology, geochemistry and age of a Cu-Mo-bearing granite at Kabeliai, southern Lithuania

AU - Sundblad, K.

AU - Mansfeld, J.

AU - Motuza, G.

AU - Ahl, M.

AU - Claesson, S.

PY - 1994/3/1

Y1 - 1994/3/1

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=0039727645&partnerID=8YFLogxK

U2 - 10.1007/BF01160138

DO - 10.1007/BF01160138

M3 - Article

AN - SCOPUS:0039727645

VL - 50

SP - 43

EP - 57

JO - Mineralogy and Petrology

JF - Mineralogy and Petrology

SN - 0930-0708

IS - 1-3

ER -