Nr.2 - ALPA - Albanian Papers
Nr.2 - ALPA - Albanian Papers Nr.2 - ALPA - Albanian Papers
Elezaj et al.Figura. 2 Goleshi ophiolite massif and its kinematics (Fejza 2004)1. Quaternary, 2. Pliocene, 3. Cretaceous, 4-8 Velesi series (Pz-T), 4. Schists, 5. Marbles, 6. Sericiteschists, 7. Gneiss, 8. Quartzite, 9. Harzburgite, 10. Low Temperature-High pressure Lithosphericdisplacement trend, 11. Fold axis.The data on the metamorphic sole of the Kosovaophiolites are still scarce. It is necessary to carryout ulterior isotopic determinations also makinguse of Ar 40 /Ar 39 method.In Albania and other Balkan countries numerousisotopic analyses, refining the age of the ophiolitemetamorphic sole are carried out. The isotopicstudies of 30 samples from different sites ofAlbania (Ivanaj, 1992; Kodra et al., 1995; Vergelyet al., 1998; Dimo, 1997), testify the MiddleJurassic age (160-174 Ma) of the metamorphicsole. This age is close to the age of the Jurassicophiolites. Plagiogranites in the north yield163±1, 8 Ma. (Ar 40 /Ar 39 ) (Vergely et al., 1998).The radiolarites found within ophiolite volcanicsand in the primary sedimentary chert-radiolariteophiolite cover indicate the Middle Jurassic age:Bajocian-Callovian (Marcucci et al., 1994; Prela,1996; Kodra et al., 1995). The very short age spanof the Jurassic ophiolites, accompanied with theirbidivergent emplacement onto Triassic-Liassicophiolites (volcano-sedimentary formation, βT 2 -J 1 ) support the suggestion on the existence ofvery narrow oceanic basin (Kodra and Gjata,1982, Vergély et al. 1998, Kodra et al. 2000,2001).Summarizing the available results that in bothsides of the ophiolite massifs the metamorphicAKTET Vol. IV, Nr 2, 2011 243
Elezaj et al.sole age is rather the same, whereas in thenorthern part of Mirdita - Gjakove ophiolitemassif, an accentuated contrasting diachronismin the longitudinal direction is recognized. It isexpressed by the oldest ages of the metamorphicsole at the southern areas varying 169 -174 Maand the youngest ages at the northern areasranging 160 - 164 Ma ( Kodra et al. 1995, 2000,2001), Fig. 3.Figura. 3. Metamorphich sole age in Northern AlbaniaTaking into consideration the metamorphic soleages of the Greek ophiolites, the diachronism ismore noticeable. The age difference is verifiedalso into the mafic segregations of Tropoja-Gjakova ophiolite massif. It is inferred that thediachronism is related to the advancement or the244AKTET Vol. IV, Nr 2, 2011
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Elezaj et al.sole age is rather the same, whereas in thenorthern part of Mirdita - Gjakove ophiolitemassif, an accentuated contrasting diachronismin the longitudinal direction is recognized. It isexpressed by the oldest ages of the metamorphicsole at the southern areas varying 169 -174 Maand the youngest ages at the northern areasranging 160 - 164 Ma ( Kodra et al. 1995, 2000,2001), Fig. 3.Figura. 3. Metamorphich sole age in Northern AlbaniaTaking into consideration the metamorphic soleages of the Greek ophiolites, the diachronism ismore noticeable. The age difference is verifiedalso into the mafic segregations of Tropoja-Gjakova ophiolite massif. It is inferred that thediachronism is related to the advancement or the244AKTET Vol. IV, Nr 2, 2011
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