The Late Cretaceous calc-alkaline and Late Cretaceous–early Eocene alkaline (shoshonitic) magmatism of Srednogora in the Balkan chain of Bulgaria are interpreted as associated with an ancient active continental margin of Cordilleran (Andean) type.

A tectonic evolution of back-arc thrust-belt type agrees, for the Balkanids, with the lack of large overthrust, ophiolite and radio-larite rock-type, eumiogeosyncline in this area.

The distribution of magmatism from the Mesozoic to the Recent and the tectonic evolution of the Balkanic-Hellenic area suggest a discontinuous southward Tertiary migration of an arc-trench system away from the southwestern edge of the Rhodope massic to its present location in the eastern Mediterranean.

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