DBPapers
DOI: 10.5593/sgem2011/s01.137

TECTONO-THERMAL EVENTS RECORDED IN A METAMORPHOSED OPHIOLITIC MELANGE, N MENDERES MASSIF, NW TURKEY

AUTHOR/S: Z. U. Ozbey
Monday 1 August 2011 by Libadmin2011

11th International Multidisciplinary Scientific GeoConference SGEM2011, www.sgem.org, SGEM2011 Conference Proceedings/ ISSN 1314-2704, June 20-25, 2011, Vol. 1, 271-276 pp

ABSTRACT

The Izmir-Ankara-Erzincan Suture Zone represents 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 ophiolites. 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 such tectonic slices
of metamorphosed ophiolitic melange is exposed along a low angle detachment fault in
N Menderes Massif, to the S of Simav Graben. The melange comprises serpentinite,
metabasite and marble blocks set in a metapelitic and metapsammitic matrix and display
a penetrative mylonitic fabric. A detailed microstructural study of the melange has
revealed four deformation phases. 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°C 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 which NNE-SSW trending mineral stretching
lineation was formed on a south dipping mylonitic 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 latest deformation (D4) is
brittle deformation represented by high-angle normal faulting of post-Pliocene age,
accommodating the N-S extension of western Anatolia.

Keywords: Tectono-thermal events, metamorphic melange, mylonites, micro-tectonics,
deformation and metamorphism histories.

PAPER 2011/s01.137: TECTONO-THERMAL EVENTS RECORDED IN A METAMORPHOSED OPHIOLITIC MELANGE, N MENDERES MASSIF, NW TURKEY

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