Geochemical constraints on the provenance, mineral sorting and subaerial weathering of Lower Jurassic and Upper Cretaceous clastic rocks of the Eastern Pontides, Yusufeli (Artvin), NE Turkey

Tanyolu, Erkan; DOKUZ, Abdurrahman

Geochemical constraints on the provenance, mineral sorting and subaerial weathering of Lower Jurassic and Upper Cretaceous clastic rocks of the Eastern Pontides, Yusufeli (Artvin), NE Turkey

Abdurrahman DOKUZ, (Karadeniz Teknik Üniversitesi, Gümüşhane Mühendislik Fakültesi, Jeoloji Mühendisliği Bölümü, Gümüşhane, Türkiye)

Erkan TANYOLU (Karadeniz Teknik Üniversitesi, Gümüşhane Mühendislik Fakültesi, Jeoloji Mühendisliği Bölümü, Gümüşhane, Türkiye)

Turkish Journal of Earth Sciences

4 0

Yıl: 2006 Cilt: 15 Sayı: 2 Sayfa Aralığı: 181 - 209 Metin Dili: İngilizce İndeks Tarihi: 29-07-2022

Geochemical constraints on the provenance, mineral sorting and subaerial weathering of Lower Jurassic and Upper Cretaceous clastic rocks of the Eastern Pontides, Yusufeli (Artvin), NE Turkey

Öz:

Yusufeli (Artvin) yöresindeki Erken Jura ve Geç Kretase yaşlı şeyi ve kumtaşlari; kaynak alanları, sedimantolojik gelişimleri ve tektonik ortamları hakkında daha fazla bilgi edinmek, ayrışma, hidrolik boylanma ve tortul-döngü olaylarının kaynak alan karakteristikleri üzerindeki etkisini değerlendirmek amacı ile petrografik ve jeokimyasal açıdan incelenmiştir. Hamur (matriks) ve mineralojik içeriklerine göre, Erken Jura yaşlı kumtaşlan arkozik arenit ve vake, Geç Kretase kumtaşlan ise litik arenit ve vake olarak tanımlanmışlardır.La/Sc, Cr/Ni, Co/Th, Th/Sc ve Cr/Th gibi element oranları her iki istif için de mafik bir kaynak alana işaret etmektedir. Bununla birlikte, bir çok örnekteki yüksek Th/Sc ve düşük Cr/Th oranları da felsik bir kaynağın katkısını öngörmektedir. Örnekler, kullanılan oransal diyagramlarda, mafik ve felsik kaynakların katkısı ile oluşan iki bileşenli bir karışım eğrisi boyunca dağılmaktadırlar. Göreli olarak düşük Cr/Ni oranları, kaynak alanda ultramafik litolojilerin olmadığına işaret etmektedir. Kumtaşlarının, üst kıtasal kabuk bileşimini temsil ettiği düşünülen post-Arkeen Avusturalya şeyllerine (PAAS) göre daha az bollukta iz element içerikleri, kaynak alanlarındaki tortul-döngü olaylarının olasılıkla daha az yoğunlukta olduğuna işaret etmektedir. Şeylerin kumtaşlarına göre daha fazla tüketilmiş hafif nadir toprak element dağılımları da, kaynak alandaki kayaçların bileşimlerindeki değişimden ziyade mineral boylanması, kimyasal ayrışma ve/veya tortul-döngüdeki değişimleri yansıtmaktadır. Alt Jura ve Üst Kretase tortullarında gözlenen kimyasal ayrışma indeksi (chemical index of alteration = CIA) (sırası ile ortalama 53 ve 46) kaynak alanlarının orta derecede kimyasal ayrışma olaylarına uğradığını öngörmektedir. Bununla birlikte, CIA indeksinin Alt Jura istiflerinde yukarıya doğru artması; kaynak alanın, olasılıkla iklim ve tektonik değişimler nedeniyle, giderek daha fazla kimyasal ayrışmaya uğradığını gösterebilir. Diğer taraftan, Üst Kretase istiflerinde CIA indeksinin yukarı doğru genel bir azalımi; tortulların göreli olarak daha az ayrışan bir kaynaktan kaynaklandığını göstermekte ve olasılıkla da artan tektonik etkinlik nedeni ile artan erozyon oranını yansıtmaktadır. Analiz edilen kumtaşlarının bileşimsel olarak olgunlaşmamış olması yitimle ilişkili ortamların tipik özelliğidir. SİO2/A12O3, K20/Na20 oranları ve Co, Sc, Th ve Zr İçerikleri okyanussal ada yayı ve kıtasal yay ortamlarını göstermektedir.

Anahtar Kelime:

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

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APA	DOKUZ A, Tanyolu E (2006). Geochemical constraints on the provenance, mineral sorting and subaerial weathering of Lower Jurassic and Upper Cretaceous clastic rocks of the Eastern Pontides, Yusufeli (Artvin), NE Turkey. , 181 - 209.
Chicago	DOKUZ Abdurrahman,Tanyolu Erkan Geochemical constraints on the provenance, mineral sorting and subaerial weathering of Lower Jurassic and Upper Cretaceous clastic rocks of the Eastern Pontides, Yusufeli (Artvin), NE Turkey. (2006): 181 - 209.
MLA	DOKUZ Abdurrahman,Tanyolu Erkan Geochemical constraints on the provenance, mineral sorting and subaerial weathering of Lower Jurassic and Upper Cretaceous clastic rocks of the Eastern Pontides, Yusufeli (Artvin), NE Turkey. , 2006, ss.181 - 209.
AMA	DOKUZ A,Tanyolu E Geochemical constraints on the provenance, mineral sorting and subaerial weathering of Lower Jurassic and Upper Cretaceous clastic rocks of the Eastern Pontides, Yusufeli (Artvin), NE Turkey. . 2006; 181 - 209.
Vancouver	DOKUZ A,Tanyolu E Geochemical constraints on the provenance, mineral sorting and subaerial weathering of Lower Jurassic and Upper Cretaceous clastic rocks of the Eastern Pontides, Yusufeli (Artvin), NE Turkey. . 2006; 181 - 209.
IEEE	DOKUZ A,Tanyolu E "Geochemical constraints on the provenance, mineral sorting and subaerial weathering of Lower Jurassic and Upper Cretaceous clastic rocks of the Eastern Pontides, Yusufeli (Artvin), NE Turkey." , ss.181 - 209, 2006.
ISNAD	DOKUZ, Abdurrahman - Tanyolu, Erkan. "Geochemical constraints on the provenance, mineral sorting and subaerial weathering of Lower Jurassic and Upper Cretaceous clastic rocks of the Eastern Pontides, Yusufeli (Artvin), NE Turkey". (2006), 181-209.

APA	DOKUZ A, Tanyolu E (2006). Geochemical constraints on the provenance, mineral sorting and subaerial weathering of Lower Jurassic and Upper Cretaceous clastic rocks of the Eastern Pontides, Yusufeli (Artvin), NE Turkey. Turkish Journal of Earth Sciences, 15(2), 181 - 209.
Chicago	DOKUZ Abdurrahman,Tanyolu Erkan Geochemical constraints on the provenance, mineral sorting and subaerial weathering of Lower Jurassic and Upper Cretaceous clastic rocks of the Eastern Pontides, Yusufeli (Artvin), NE Turkey. Turkish Journal of Earth Sciences 15, no.2 (2006): 181 - 209.
MLA	DOKUZ Abdurrahman,Tanyolu Erkan Geochemical constraints on the provenance, mineral sorting and subaerial weathering of Lower Jurassic and Upper Cretaceous clastic rocks of the Eastern Pontides, Yusufeli (Artvin), NE Turkey. Turkish Journal of Earth Sciences, vol.15, no.2, 2006, ss.181 - 209.
AMA	DOKUZ A,Tanyolu E Geochemical constraints on the provenance, mineral sorting and subaerial weathering of Lower Jurassic and Upper Cretaceous clastic rocks of the Eastern Pontides, Yusufeli (Artvin), NE Turkey. Turkish Journal of Earth Sciences. 2006; 15(2): 181 - 209.
Vancouver	DOKUZ A,Tanyolu E Geochemical constraints on the provenance, mineral sorting and subaerial weathering of Lower Jurassic and Upper Cretaceous clastic rocks of the Eastern Pontides, Yusufeli (Artvin), NE Turkey. Turkish Journal of Earth Sciences. 2006; 15(2): 181 - 209.
IEEE	DOKUZ A,Tanyolu E "Geochemical constraints on the provenance, mineral sorting and subaerial weathering of Lower Jurassic and Upper Cretaceous clastic rocks of the Eastern Pontides, Yusufeli (Artvin), NE Turkey." Turkish Journal of Earth Sciences, 15, ss.181 - 209, 2006.
ISNAD	DOKUZ, Abdurrahman - Tanyolu, Erkan. "Geochemical constraints on the provenance, mineral sorting and subaerial weathering of Lower Jurassic and Upper Cretaceous clastic rocks of the Eastern Pontides, Yusufeli (Artvin), NE Turkey". Turkish Journal of Earth Sciences 15/2 (2006), 181-209.