Metamorphic and tectonic evolution of the Hırkadağ block, Central Anatolian crystalline complex

DİLEK, Yıldırım; WHITNEY, Donna L.

Metamorphic and tectonic evolution of the Hırkadağ block, Central Anatolian crystalline complex

Donna L. WHITNEY, (Univercity of Minnesota, Geology and Geophysics, Minneapolis, MN 55455, USA)

Yıldırım DİLEK (Girilmedi)

Turkish Journal of Earth Sciences

2 0

Yıl: 2001 Cilt: 10 Sayı: 1 Sayfa Aralığı: 1 - 15 Metin Dili: Türkçe İndeks Tarihi: 29-07-2022

Metamorphic and tectonic evolution of the Hırkadağ block, Central Anatolian crystalline complex

Öz:

KD-GB yönelimli bir horst yapısı gösteren Hırkadağ bloğu Orta Anadolu Kristalen Kompleksi içerisinde yer alan Kırşehir metamorfik masifinin bir parçasıdır. Hırkadağ bloğunun GB kesiminde yer alan metapelitik kayalar yüksek amfibolit derecesinde metamorfize olup, jeotermometrik ve jeobarometrik hesaplamalar sıcaklık ve basıncın 670-710 0C ve yaklaşık 7 kilobara kadar çıktığını göstermektedir. Termobarometrik hesaplamalar ve aluminyumlu mineral fazlarının gösterdiği reaksiyon dokularının özellikleri, Hırkadağ bloğunun genelde saat yönünde ilerleyen bir basınç-sıcaklık evrimi geçirdiğini ifade ederler. Bu orta basınç metamorfizmasını takiben, Hırkadağ metamorfitleri bir alçak basınç-yüksek sıcaklık metamorfizmasına uğramış olup, granatlar kordiyerit + spinel + sillimanite parajenezi, spinel ise korundum fazı tarafından replase edilmişlerdir. Aynı zamanda gelişen kısmi ergime de metamorfitler içerisinde yerleşen granitik sokulumlarını oluşturmuştur. Granat-kordiyerit termobarometrik hesaplamaları bu alçak basınç-yüksek sıcaklık metamorfizmasının yaklaşık 3 kilobarda ve 650 0C den yüksek sıcaklıklarda geliştiğini göstermektedir. Söz konusu alçak basınç-yüksek sıcaklık metamorfizması, Orta Anadolu Kristalen Kompleksi içerisindeki öteki masiflerde de gözlendiği gibi, çarpışma sonrası gelişen mağmatizma ile yakından ilişkilidir. Hırkadağ bloğunu güneybatıdan ve kuzeydoğudan çevreleyen normal faylar aynı zamanda hem blok içerisindeki metamorfik yapıları hem de granitik sokulumunu kesmektedir. Bu faylar, Kırşehir Masifi'nin Geç Eosen'deki erozyonal yükselimini takiben gelişen ve masifin güney kesiminin yükselimine yol açan Geç Tersiyer yaşlı kıta-kabuğu ölçeğindeki bir gerilmeli tektonizmanın ürünleridir.

Anahtar Kelime:

Konular: Jeoloji

Hırkadağ bloğunun metamorfik ve tektonik evrimi, Orta Anadolu kristalen kompleksi

Öz:

The Hırkadağ metamorphic block is a NE-SW-trending horst structure that is part of the Kırşehir Massif in the Central Anatolian Crystalline Complex (CACC). Along its southwestern margin, the block contains upper amphibolite fades metapelitic rocks that record peak metamorphic conditions of 670-710 0C, $sim$7 kbar, as determined by garnet-biotite geothermometry and garnet-sillimanite-plagioclase-quartz, garnet-rutile-sillimanite-ilmenite-quartz, and garnet-rutile-ilmenite-plagioclase-quartz geobarometry. A clockwise pressure-temperature path is inferred from thermobarometric results and analysis of reaction textures among aluminous phases. Following this medium-pressure metamorphism, low-pressure - high-temperature metamorphism resulted in widespread replacement of garnet by cordierite + spinel + sillimanite, partial replacement of spinel by corundum, and partial melting to produce granitic leucosomes. Garnet-cordierite thermobarometry indicates that low-P -high-T metamorphism occurred at 3 kbar, > 650 0C. This event may have occurred owing to isothermal decompression at high temperatures, or may have been related to magmatism, similar to intrusion-related low-P - high-T metamorphism elsewhere in the CACC. High-angle normal faults bounding the southwestern and northeastern margins of the block truncate metamorphic structures and a granitic intrusion. These faults are part of a crustal-scale extension zone that uplifted the southern part of the Kırşehir Massif in the Late Tertiary, following its erosional exhumation in the Late Eocene.

Anahtar Kelime:

Konular: Jeoloji

Belge Türü: Makale Makale Türü: Araştırma Makalesi Erişim Türü: Erişime Açık

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APA	WHITNEY D, DİLEK Y (2001). Metamorphic and tectonic evolution of the Hırkadağ block, Central Anatolian crystalline complex. , 1 - 15.
Chicago	WHITNEY Donna L.,DİLEK Yıldırım Metamorphic and tectonic evolution of the Hırkadağ block, Central Anatolian crystalline complex. (2001): 1 - 15.
MLA	WHITNEY Donna L.,DİLEK Yıldırım Metamorphic and tectonic evolution of the Hırkadağ block, Central Anatolian crystalline complex. , 2001, ss.1 - 15.
AMA	WHITNEY D,DİLEK Y Metamorphic and tectonic evolution of the Hırkadağ block, Central Anatolian crystalline complex. . 2001; 1 - 15.
Vancouver	WHITNEY D,DİLEK Y Metamorphic and tectonic evolution of the Hırkadağ block, Central Anatolian crystalline complex. . 2001; 1 - 15.
IEEE	WHITNEY D,DİLEK Y "Metamorphic and tectonic evolution of the Hırkadağ block, Central Anatolian crystalline complex." , ss.1 - 15, 2001.
ISNAD	WHITNEY, Donna L. - DİLEK, Yıldırım. "Metamorphic and tectonic evolution of the Hırkadağ block, Central Anatolian crystalline complex". (2001), 1-15.

APA	WHITNEY D, DİLEK Y (2001). Metamorphic and tectonic evolution of the Hırkadağ block, Central Anatolian crystalline complex. Turkish Journal of Earth Sciences, 10(1), 1 - 15.
Chicago	WHITNEY Donna L.,DİLEK Yıldırım Metamorphic and tectonic evolution of the Hırkadağ block, Central Anatolian crystalline complex. Turkish Journal of Earth Sciences 10, no.1 (2001): 1 - 15.
MLA	WHITNEY Donna L.,DİLEK Yıldırım Metamorphic and tectonic evolution of the Hırkadağ block, Central Anatolian crystalline complex. Turkish Journal of Earth Sciences, vol.10, no.1, 2001, ss.1 - 15.
AMA	WHITNEY D,DİLEK Y Metamorphic and tectonic evolution of the Hırkadağ block, Central Anatolian crystalline complex. Turkish Journal of Earth Sciences. 2001; 10(1): 1 - 15.
Vancouver	WHITNEY D,DİLEK Y Metamorphic and tectonic evolution of the Hırkadağ block, Central Anatolian crystalline complex. Turkish Journal of Earth Sciences. 2001; 10(1): 1 - 15.
IEEE	WHITNEY D,DİLEK Y "Metamorphic and tectonic evolution of the Hırkadağ block, Central Anatolian crystalline complex." Turkish Journal of Earth Sciences, 10, ss.1 - 15, 2001.
ISNAD	WHITNEY, Donna L. - DİLEK, Yıldırım. "Metamorphic and tectonic evolution of the Hırkadağ block, Central Anatolian crystalline complex". Turkish Journal of Earth Sciences 10/1 (2001), 1-15.