MIOCENE REMAGNETISATION OF CARBONATE PLATFORM AND ANTALYA COMPLEX UNITS WITHIN THE ISPARTA ANGLE, SW TURKEY

A palaeomagnetic study has been carried out within the Mesozoic and Te rtiary units of the relatively autochthonous carbonate platforms and t he allochthonous deep-sea volcanics and sediments of the Antalya Compl ex, exposed around the Isparta angle, SW Turkey. The Antalya Complex i s interpreted as a mosaic of carbonate platforms, basinal sediments, v olcanic and ophiolitic rocks which formed within a southerly strand of the Neotethyan ocean, adjacent to Gondwana. The results indicate a wi despread remagnetisation event. Negative fold tests show that the rema nence at most sites is of secondary origin (e.g., within the Cirali la vas). The magnetisation is carried by magnetite of presumed authigenic origin. The remagnetisation event is believed to have occurred in the Early-Middle Miocene (Burdigalian-Langhian). It was possibly triggere d by the migration of orogenic fluids ahead of the advancing Lycian na ppes during their emplacement onto the carbonate platforms. Subsequent to remagnetisation, a large segment of the Isparta angle underwent an anticlockwise rotation of 30-degrees. This rotation is attributed to the overall convergence and bending of the Hellenic arc and the final stages of emplacement of the Lycian Nappes during the Late Miocene, in agreement with previous studies. Previously, southerly palaeolatitude s were inferred from Late Triassic extrusives of the Godene Zone (Calb ali Dag unit). The post-folding magnetisation identified here within t he Cirali lavas of the Godene Zone to the south implies that these low palaeolatitudes result from the inappropriate application of structur al tilt corrections. The available data cannot be used to substantiate an origin for the Antalya units south of the equator in the early Mes ozoic. Instead, a position close to the northern margin of Gondwana is indicated.