Akademik Veri Yönetim Sistemi
Geological Development of Anatolia and the Easternmost Mediterranean Region, Robertson,A.H.F,Parlak,O.,Ünlügenç,U.C., Editör, Geological Society Of London, London, ss.141-165, 2013
Abstract: Upper Ordovician–Upper Cretaceous high-pressure–low-temperature metasedimentary
and meta-igneous rocks in the Dursunbey area provide insights into the Tavs¸anlı Zone (Anatolides)
when compared to crustal units further south (e.g. Afyon Zone and Taurides). Schists near
the base of the Tavs¸anlı Zone succession are cut by a small Upper Ordovician metagranite. This is
covered by metaclastic sediments that are interbedded with bimodal rift-related basic-silicic volcanics
of inferred Triassic age. Above this is a thick metacarbonate platform interpreted as the
result of post-rift subsidence. Overlying metacarbonates, metapelites and metachert with metabasaltic
intercalations (Upper Cretaceous?) reflect platform collapse. Overlying me´lange contains
blocks of ocean-derived intrusive and extrusive igneous rocks (e.g. ocean island-type basalt), metacarbonates
and radiolarian chert, set in a low-grade metamorphosed shaly matrix. The Tavs¸anlı
Zone was buried in a north-dipping subduction zone to 74–79 km at c. 88 Ma, exhumed and tectonically
juxtaposed with accretionary me´lange prior to the Late Palaeocene–Early Eocene. Geochemical
studies of the meta-igneous rocks indicate the presence of ocean island basalt (OIB)
and mid-ocean ridge basalt (MORB) sources modified by crustal contamination, evidenced by
Th enrichment and fractional crystallization. A subduction chemical influence in the lower part
of the succession (e.g. Nb depletion) was probably derived from subcontinental mantle lithosphere,
modified during some previous subduction event (Panafrican?).