Öz
The studied area is located at the southern boundary of the İzmir-Ankara geosyncline, to the west of Kütahya. The maparea of Budağan Dağ is cut into two segments by an WNW trending steep fault, the Great Fault (new name). On the opposite sides of the Great Fault the rock assemblages are different and the stratigraphie sequences are formed independently.
At the north of the Great Fault the following rock sequence occurs, in descending order :
—Aphanitic limestone (Budağandağ limestone).
—Shale and graywacke associated with exotics (Karaçalı formation).
—Diabasic deriviatives associated with exotics, which are differentiated into 'exotic zones';
—Diabasic lava, tuff; bedded chert and recrystallized limestone (Ovacık group).
—Lawsonite - albite schist (Kızıltepe formation)
—Ultrabasic
Except the lawsonite - albite schist unit, the others are free of metamorphism. All the boundaries between the rock units represent the erosional Stages.
At the south of the Great Fault the rock sequence, in descending order, is as followed:
—Aphanitic limestone, tectonic marble (Budağan limestone)
—Metasedimentites (Üyücek formation)
—Quartz-albite-muscovite-chlorite schist (İkibaşlı formation)
The Budağandağ limestone covers the Great Fault and has suffered local dinamometamorphism into a zone reflecting the reactivation of the Great Fault.
The lawsonite - albite schist is restricted to the northerly lying depositional site, as an earlier cycle of sedimentation on the ultrabasic basement. The present criteria eliminate the possibility of an origin of sedimentary overburden or of thrust tectonic. Certain evidences exist for interstitial circulation, resembling a metasomatic process.
On the ultrabasic plus lawsonite - albite schist basement, the Ovacık group shows marked overstep southwards, so that the uppermost part of the group on the extreme southern margin lies directly on the metamorphic sucession. The Karaçalı formation abruptly decreases in thickness toward the south. To the reference horizon of Budağan Dağ limestone, at least, 1300 m thick stratigraphie column is lacking at the south of the Great Fault.
It could be argued that tensional movements developed in the crust just after the emplacement of the ultrabasic as an upper mantel portion. The tensional forces might, at least, have played a role during or to the end of the ultrabasic emplacement as the component of the driving forces at depths.
The isostatic and tectonic rearrangement of the ultrabasic yielded a continuously mobile, linear depression. In this trough a rhythm of eugeosynclinal and miogeosynclinal conditions occured.
In the area vertical gravity tectonic is predominating. The soundly established thrust faults are younger than the deposition of diabasic material and also that of the younger units. The available ages are Maestrichtian and Late Senonnian for the Budağan limestone and Karaçalı formation, respectively.