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akaturk Akademik ölçüm

Makale detayı · 1992

Timing of Cenozoic extensional tectonics in west Turkey

Dergi

Journal of the Geological Society
OpenAlex SJR Q1 JCR Q1 Atıf 187 Üst %10 Yüzdelik 93.7% FWCI 3.95
Yıl
1992
Tür
article

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  • YÖKSİS dergi adı Journal of the Geological Society
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Özet

OpenAlex · İngilizce

The timing of the transition from compressional to extensional tectonics in the late Cenozoic evolution of west Turkey has been constrained by K-Ar geochronology from acidic volcanic rocks and tourmaline leucogranite dykes in the central and east margin respectively of the Gördes basin. Dacites and rhyolites in the centre of the Gördes Neogene sedimentary basin cut both the basement ophiolites of the Izmir-Ankara suture zone and the Neogene sediments. On the basin’s eastern margin the leucogranites cut metamorphic basement along a major NE-SW-trending normal fault that controls the regional structure of the basin. Pebbles of these leucogranites occur in adjacent Neogene turfites and conglomerates. K-Ar dates on biotites from the central volcanic rocks vary from 18.4 ± 0.8 Ma to 16.3 + 0.5 Ma (early Miocene) whilst muscovite from a leucogranite on the eastern margin of the basin provides ages of 24.2 ± 0.8 Ma and 21.1 ± 1.1 Ma (latest Oligocene to early Miocene). Geochronological data and field relationships demonstrate that the earlier compressional regime had been replaced by extensional tectonics by latest Oligocene-early Miocene.

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