Sr and Nd isotopic characteristics of some S-, I- and a-type granitoids from Central Anatolia

Serhat KÖKSAL, (Orta Doğu Teknik Üniversitesi, Radyojenik İzotop Laboratuvarı, Ankara, Türkiye)
Cemal GÖNCÜOĞLU (ODTÜ Müh. Fakültesi, Jeoloji Müh. Bölümü, Ankara, Türkiye)
Turkish Journal of Earth Sciences
7 0
Yıl: 2008 Cilt: 17 Sayı: 1 Sayfa Aralığı: 111 - 127 Metin Dili: İngilizce İndeks Tarihi: 29-07-2022

Sr and Nd isotopic characteristics of some S-, I- and a-type granitoids from Central Anatolia

Öz:
Orta Anadolu’da, Aksaray ve Kırşehir yörelerindeki bazı Geç Kretase yaşlı S-, I- ve A-tipi granitoyidlerin petrojenezi, tüm-kayaç Sr ve Nd izotop verileri ve tamamlayıcı arazi, petrografi ve tüm-kayaç jeokimyası verilerine dayanarak irdelenmiştir. S-tipi Orta Anadolu granitoyidleri (Sinandı ve Namlıkışla) kalk-alkalen peralüminalı karaktere sahip olup, LILE ve LREE zenginleşmesi göstermektedir. Buna karşın I-tipi Orta Anadolu granitoyidleri (Borucu, Terlemez, Hisarkaya, Baranadağ) kalk-alkalen (alkalen Baranadağ örneği dışında) metaaluminalı veya zayıf peraluminalı olup, LILE ve LREE’ce zengin dağılımlar ve farklılaşan Eu-anomalisi sunmaktadır. Ayrıca A-tipi Çamsarı granitoyidi alkalen metaaluminalı olup en yüksek LREE içeriklerine sahiptir. I-tipi Orta Anadolu granitoyidleri ($^{87}Sr/^{86}Sr(i)$: 0.7078–0.7109; $varepsilon$Nd: -5.4’ten -7.9’a) ve A-tipi Çamsarı granitoyidi ($^{87}Sr/^{86}Sr(i)$: 0.7082; $varepsilon$: -7.1) benzer izotop verilerine sahiptir. Buna karflın S-tipi Orta Anadolu Granitoyidleri Orta Anadolu’daki I- ve A-tipi granitoyidlerden daha radyojenik ilksel Sr izotop oranlarına ($^{87}Sr/^{86}Sr(i)$: 0.7128–0.7152) ve daha düşük $varepsilon$ (-9.1‘den -9.7’e) değerlerine sahiptir. Mevcut petroloji ve yaş verileriyle birleştirildiğinde, bu çalışmada sunulan izotop verileri Orta Anadolu’daki çarpışma ile ilgili S-tipi granitik birlikler ve nispeten genç I- ve A-tipi magmatizma önerisini desteklemektedir. Sr ve Nd izotop verileri I- ve A-tipi Orta Anadolu granitoyidlerinin, A-tipinde manto bileşeni daha baskın olmak üzere, hibrid ve heterojen kaynaklara sahip olduğunu önermektedir. Buna ek olarak, S-tipi Orta Anadolu granitoyidleri muhtemelen kıtasal, veya baskın kıtasal kökenli magmatik kaynaklardan oluşmuştur. Ayrıca, S-tipi granitoyidlerden I- ve A-tipi magmatik kayaçlara doğru gözlenen 87Sr/86Sr(i) değerlerindeki artış ve $varepsilon$ değerlerindeki yükseliş, farklı kaynak özelliklerinden veya manto ve kıtasal kaynakların zaman içerisinde izotopik olarak karışması ile bağlantılı olabilir.
Anahtar Kelime:

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APA Köksal S, GÖNCÜOĞLU C (2008). Sr and Nd isotopic characteristics of some S-, I- and a-type granitoids from Central Anatolia. , 111 - 127.
Chicago Köksal Serhat,GÖNCÜOĞLU Cemal Sr and Nd isotopic characteristics of some S-, I- and a-type granitoids from Central Anatolia. (2008): 111 - 127.
MLA Köksal Serhat,GÖNCÜOĞLU Cemal Sr and Nd isotopic characteristics of some S-, I- and a-type granitoids from Central Anatolia. , 2008, ss.111 - 127.
AMA Köksal S,GÖNCÜOĞLU C Sr and Nd isotopic characteristics of some S-, I- and a-type granitoids from Central Anatolia. . 2008; 111 - 127.
Vancouver Köksal S,GÖNCÜOĞLU C Sr and Nd isotopic characteristics of some S-, I- and a-type granitoids from Central Anatolia. . 2008; 111 - 127.
IEEE Köksal S,GÖNCÜOĞLU C "Sr and Nd isotopic characteristics of some S-, I- and a-type granitoids from Central Anatolia." , ss.111 - 127, 2008.
ISNAD Köksal, Serhat - GÖNCÜOĞLU, Cemal. "Sr and Nd isotopic characteristics of some S-, I- and a-type granitoids from Central Anatolia". (2008), 111-127.
APA Köksal S, GÖNCÜOĞLU C (2008). Sr and Nd isotopic characteristics of some S-, I- and a-type granitoids from Central Anatolia. Turkish Journal of Earth Sciences, 17(1), 111 - 127.
Chicago Köksal Serhat,GÖNCÜOĞLU Cemal Sr and Nd isotopic characteristics of some S-, I- and a-type granitoids from Central Anatolia. Turkish Journal of Earth Sciences 17, no.1 (2008): 111 - 127.
MLA Köksal Serhat,GÖNCÜOĞLU Cemal Sr and Nd isotopic characteristics of some S-, I- and a-type granitoids from Central Anatolia. Turkish Journal of Earth Sciences, vol.17, no.1, 2008, ss.111 - 127.
AMA Köksal S,GÖNCÜOĞLU C Sr and Nd isotopic characteristics of some S-, I- and a-type granitoids from Central Anatolia. Turkish Journal of Earth Sciences. 2008; 17(1): 111 - 127.
Vancouver Köksal S,GÖNCÜOĞLU C Sr and Nd isotopic characteristics of some S-, I- and a-type granitoids from Central Anatolia. Turkish Journal of Earth Sciences. 2008; 17(1): 111 - 127.
IEEE Köksal S,GÖNCÜOĞLU C "Sr and Nd isotopic characteristics of some S-, I- and a-type granitoids from Central Anatolia." Turkish Journal of Earth Sciences, 17, ss.111 - 127, 2008.
ISNAD Köksal, Serhat - GÖNCÜOĞLU, Cemal. "Sr and Nd isotopic characteristics of some S-, I- and a-type granitoids from Central Anatolia". Turkish Journal of Earth Sciences 17/1 (2008), 111-127.
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