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TECTONO-THERMAL EVENTS RECORDED IN A METAMORPHOSED OPHIOLITIC MELANGE, N MENDERES MASSIF, NW TURKEY
Abstract
The Izmir-Ankara-Erzincan Suture Zone repr esents the relicts of the Late Mesozoic- Early Cenozoic Neotethyan Ocean in N Turkey. This suture zone marks the boundary of amalgamated S Eurasian and N Gondwanan continents and is characterised by the presence of ophiolitic melanges and ophiolite s. Two different ophiolitic melanges may be distinguished in this zone based on their metamorphic grade. Unmetamorphosed melanges are widespread along the suture zone whereas metamorphic melanges occur only at a structurally lower position as thin tectonic wedges. One of su ch tectonic slices of metamorphosed ophiolitic melange is exposed along a low angle detachment fault in N Menderes Massif, to the S of Simav Gr aben. The melange comprises serpentinite, metabasite and marble blocks set in a metapelitic and metapsammitic matrix and display a penetrative mylonitic fabr ic. A detailed microstructura l study of the melange has revealed four deformation pha ses. The folded relict fabric seen in the staurolite and kyanite porphyroblasts represent D1 and D2 deformation phases. The coexistence of staurolite, kyanite and garnet porphyroblasts indicate a regional metamorphism (M1) at upper-amphibolite facies conditions. The M2 metamorphism is represented by the growth of the sillimanite from kyanite and point out a progressive metamorphism at conditions between 670-680 ЛљC and 7-9 kbar, corresponding to a burial depth of 21 km. Andalusite porphyroblasts may have formed in response to contact metamorphism (M3?) of an Early Miocene granite. The first two deformations (D1 and D2) were obliterated by the penetratively developed D3 deformation. D3 is a top-to-the-northeast ductile mylonitic deformation during whic h NNE-SSW trending mineral stretching lineation was formed on a south dipping myl onitic foliation. Retrograde metamorphism (M4) at greenschist facies conditions was associated with the exhumation of high-grade rocks (i.e. the Menderes Massif ) during the D3 event. The la test deformation (D4) is brittle deformation represented by high-angl e normal faulting of post-Pliocene age, accommodating the N-S extension of western Anatolia.
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References8
Collins, A.S., Robertson, A.H.F., Evol ution of the Lycian allochton, western Turkey, as a north-facing Late Palaeozoic to Mesozoic rift and passive continental margin, Geological Journal, 34, 1999, 107 – 138.
Özgül, N., Bozk ır-Hadim-Taşkent (Orta Toroslar’ ın kuzey kesimi) dolayı nda yer alan tektono-stratigrafik birliklerin stratigrafisi, M.T.A.Dergisi, 119, 1997, 113 –
Iş ık, V., Tekeli, O., Seyito ğlu, G., The Ar/ Ar age of extensional ductile deformation and granitoid intrusion in the northern Menderes core complex: implications for the initiation of extensional tectonics in western Turkey, Journal of Asian Sciences, 23, 2004, 555 – 566.
Thomson, S.N. & Ring U., Thermoch ronologic evaluation of post-collision extension in the Anatolide Orogen, western Turkey. Tectonics, 25, 2006, TC3005, DOI: 10.1029/2005TC001833
Akdeniz, N., Konak, N., Ağ ustos, Menderes Masifi’nin Simav dolay ındaki kayabirimleri ve metabazik, metaultramafik kayalar ın konumu, TJK Bülteni , C. 22, 1979 175 – 183.
Candan, O., Kun, N., Menderes Masifi’nin bat ısında paleo–melanj ku şağının varlığı, TPJD Bülteni, C.1/3, 1989, 237 – 251
Güngör, T., Erdo ğan, B., Tectonic significance of mafic volcanic rocks in a Mesozoic sequence of the Menderes Massif, west Turkey, International Journal of Earth Sciences, 91, 2002, 386 – 397.
Aysal, N., The geology mineralogy and petrography of the Ozbeyli (Sivasl ı-Uşak) Metaophiolite, Istanbul Earth Sciences Review, C.15-1, 2002, 1-13.
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