Diagenesis and low grade metamorphism of Karakaya Complex units in the NW Anatolia

Yıl 2009, Cilt: 30 Sayı: 3, 193 - 212, 01.04.2009

Sema Tetiker Hüseyin Yalçın Ömer Bozkaya

Öz

Anahtar Kelimeler

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KB Anadolu’daki Karakaya Karmaşığı birimlerinin diyajenezi-düşük dereceli metamorfizması

Öz

Bu çalışmada, KB Anadolu’da Sakarya Kompozit Birliği içerisinde yer alan Paleotetis ile ilişkili Permo-Triyas yaşlı Karakaya Karmaşığı’nın tanım ve oluşumuna, birimlerin diyajenetik-metamorfik özellikleri ortaya konularak katkıda bulunulması amaçlanmıştır. KB Anadolu’da Alt Karakaya birimlerinden Nilüfer biriminin alt kesimi mavişist, üst kesimi ise yeşilsist fasiyesindeki kayaçları içermektedir. Kireçtaşı blokları içeren Üst Karakaya birimlerini psamit, pelit ve karbonat kayaçları ile volkanikler temsil etmektedir. KB Anadolu’da Alt Karakaya biriminde bolluk sırasına göre fillosilikat (illit, klorit, stilpnomelan, smektit, kaolinit, C-S, I-S, C-V), feldispat, kalsit, kuvars, dolomit, piroksen (ojit, Ti-ojit), amfibol (hornblend, glokofan, tremolit/aktinolit, antofillit), hematit, epidot ve götit; Üst Karakaya birimlerinde kuvars, fillosilikat (illit, klorit, I-S, C-V, C-S, I-C, kaolinit, vermikülit, smektit), kalsit, dolomit, feldispat, epidot, ojit, hornblend, natrolit, hematit ve götit tanımlanmıştır. Nilüfer, Orhanlar ve Çal birimlerine ait trioktahedral şamozitik kloritler IIb; fenjitik bileşimli dioktahedral illitler 2M1+1M+1Md politipine sahiptir. Kübler indeksi (KI) ve Arkai indeksi (AI) verileri; Nilüfer biriminde düşük dereceli ankizon ve epizon, Hodul biriminde yüksek dereceli diyajenez, Orhanlar biriminde yüksek diyajenez-düşük dereceli ankizon, Çal biriminde ise düşük dereceli diyajenez derecesine karşılık gelmektedir. İllitlerin b0 değerleri Alt Karakaya birimlerinde orta-yüksek ve Üst Karakaya birimlerinde çoğunlukla orta basınç fasiyes serisini göstermektedir. Dokusal özellikler, mineral birliktelikleri, kil / fillosilikat mineral dönüşümleri, tipik indeks mineraller ve fillosilikatların kristalkimyasal verilerine göre; Alt Karakaya birimleri yüksek basınç-düşük sıcaklık ile temsil edilen sıkışmalı, Üst Karakaya birimleri ise ısı akışının etkili olduğu genişlemeli bir havzayı yansıtan diyajenetik/metamorfik özelliklere sahiptir

Anahtar Kelimeler

b0, illit kristalinite, kil mineralojisi, petrografi, XRD

Kaynakça

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