CRYSTALLIZATION AND COOLING OF SİMAV MIGMATITES AND THEIR TECTONIC SIGNIFICANCE EVIDENCE FROM U Pb and Ar Ar GEOCHRONOLOGY

Date

2015-04-06

Author

Bozkurt, Erdin
Gilles, Ruffet

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The migmatites associated with pegmatites and (leuco)granites occur in the footwall of the Simav detachment fault. As in the case of other core-complexes worldwide, the co-existence of these rocks imply intimitate spatial and temporal relationships among migmatization, crustal extensional tectonics and granitic magma emplacement. A systematic geochronologic campaingn has been carried out to determine the crystallization (U-Pb analyses on zircon and monazites) and cooling (Ar-Ar analyses on muscovite and biotites) age of these rocks. The new data would be useful in determining the timing of melt crystallization in migmatites, pegmatites and granites and their cooling ages, as well as in calculating the exhumation rates. The new age data from the migmatites suggests that the deposition of the protolith sediments must have occurred sometime younger than middle Jurassic. The migmatitization commenced by early Oligocene (Rupelian) and continued until early Miocene (Aquitanian). Granitic and pegmatitic magmatism (metamorphosed and deformed) accompanying migmatization took place during late Oligocene (early Chattian) whereas the crystallization and emplacement of undeformed granites occurred during the Aquitanian. The exhumation of the metamorphic rocks, migmatites and associated granitic rocks continued until Serravallian. The new age data suggest that the core-complex formation and activity of the Simav detachment fault commenced by early Oligocene (Rupelian) and continued until Serravallian. Messinian is interpreted as the initiation of modern graben formation in the region.

Subject Keywords

Migmatite, Pegmatite, (Leuco)granite, Extensional tectonics, Metamorphic corecomplex, U-Pb geochronology, Ar-Ar mica ages, Menderes Massif

URI

https://hdl.handle.net/11511/78169
https://www.jmo.org.tr/resimler/ekler/00f7c1630b6e86b_ek.pdf

Conference Name

68. Türkiye Jeoloji Kurultayı (6 - 10 Nisan 2015)

Collections

Department of Geological Engineering, Conference / Seminar

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Citation Formats

E. Bozkurt and R. Gilles, “CRYSTALLIZATION AND COOLING OF SİMAV MIGMATITES AND THEIR TECTONIC SIGNIFICANCE EVIDENCE FROM U Pb and Ar Ar GEOCHRONOLOGY,” presented at the 68. Türkiye Jeoloji Kurultayı (6 - 10 Nisan 2015), Ankara, Türkiye, 2015, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/78169.