Significance of the volcanogenic Nilüfer Unit and related components of the Triassic Karakaya Complex for Tethyan subduction/Accretion processes in NW Turkey

Elizabeth A. PICKETT, (British Geological Survey, Murchison House, West Mains Road, Edinburg, UK)
Alastair H.F. ROBERTSON (Girilmedi)
Turkish Journal of Earth Sciences
1 0
Yıl: 2004 Cilt: 13 Sayı: 2 Sayfa Aralığı: 97 - 143 Metin Dili: İngilizce İndeks Tarihi: 29-07-2022

Significance of the volcanogenic Nilüfer Unit and related components of the Triassic Karakaya Complex for Tethyan subduction/Accretion processes in NW Turkey

Öz:
Karakaya Kompleksi kuzey Anadolu'da batıdan doğuya, Ege Denizi'nden İran'a kadar yaklaşık 1100 km bir dağılımı olan Orta-Geç Triyas yaşında bir dalma-batma-eklenme kompleksidir. Karakaya Kompleksi çok kuvvetli deformasyon geçirmiş Triyas yaşta okyanusal deniz adaları, okyanus-ortası-sırtı tipi kabuk, hendek tipi çökel kayalar (Ortaoba Birimi) ve Permiyen-Triyas yaşta kıtasal parçalar (Çal Birimi) içerir. Bu makalede, volkanik ve volkaniklastik kayalar, volkanojenik sedimenter kayalar, heterojen moloz akıntı çökelleri, kalsiturbidit, silisli pelajik sedimenter kayalar ve yer yer neritik Triyas kireçtaşlarından oluşan Nilüfer Birimine odaklanılmıştır. Nilüfer Birimi'nin baskın litolojisi massif bazalt ve bazik piroklastik kayalardır. Bunlara volkanojenik kumtaşı, silttaşı, çamurtaşı ve volkanojenik breş türü kırıntılı kayalar eşlik eder. Bu litolojiler, kıtasal etkilerden uzakta, Triyas yaşta Tetis okyanusu içinde bir veya birden fazla volkanik deniz adalarında ve çevrelerinde oluşmuştur. Bazaltlarda yapılan tüm kaya jeokimya analizleri, ve yine bazaltlardaki piroksenlerde yapılan elektron-mikroprob analizleri, Nilüfer Birimi bazaltlarının, herhangi bir dalma-batma zonu etkisi görülmeyen levha-içi bir karakterde olduğunu teyit eder. Nilüfer Birimi genellikle yeşilşist fasiyesinde, yer yer eklojite varan yüksek basınç/düşük sıcaklık fasiyesinde, bölgesel metarhorfizma geçirmiştir. Nilüfer Birimi'nin yapısal olarak üstünde yer alan Ortaoba (Hodul)Birimi, okyanus ortası tipi bazaltların, radyolaryalı çörtlerin ve az oranda serpantinleşmiş ultramafik kayaların,hendek tipi çökeller olarak yorumlanan arkozik klastiklere eklendiği bir dalma-batma zonu ortamını tanımlar. Tektonik olarak daha üstte yer alan, ve metamorfizma geçirmemiş olan Çal Birimi, levha-içi bazaltlarla beraber bulunan Geç Permiyen yaşta neritik kireçtaşı bloklarından oluşur. Çal Birimi'nin yer yer korunmuş alt kesimleri, jeokimyasal olarak kıtasal kökenli olarak belirlenen mikali şeyller kapsar. Bu durum Çal Birimi'nin kıtasal bir kabuk üzerinde çökeldiği, daha sonra bu kabuğun dalma-batma ile yok olduğuna işaret eder. Bu tip bir veya birden çok kıtasal parça, Triyas Tetisi'nin güney kenarından (Anatolidler'den) riftleşme ile ayrılmış, kuzeye hareket ederek, Avrasya kıta kenarına eklenmiştir. Bu konuda kesin veri olmamasına rağmen, dalma-batma polaritesinin kuzeye doğru olduğu sanılmaktadır. Karakaya Kompleksi, daha sonra, muhtemelen Çal kıtasal parçasının Lavrasya kıta kenarı (Sakarya temeli) ile çarpışması sonucu, kuzeye Lavrasya kıta kenarı üzerine itilmiştir.
Anahtar Kelime:

Belge Türü: Makale Makale Türü: Araştırma Makalesi Erişim Türü: Erişime Açık
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APA PICKETT E, ROBERTSON A (2004). Significance of the volcanogenic Nilüfer Unit and related components of the Triassic Karakaya Complex for Tethyan subduction/Accretion processes in NW Turkey. , 97 - 143.
Chicago PICKETT Elizabeth A.,ROBERTSON Alastair H.F. Significance of the volcanogenic Nilüfer Unit and related components of the Triassic Karakaya Complex for Tethyan subduction/Accretion processes in NW Turkey. (2004): 97 - 143.
MLA PICKETT Elizabeth A.,ROBERTSON Alastair H.F. Significance of the volcanogenic Nilüfer Unit and related components of the Triassic Karakaya Complex for Tethyan subduction/Accretion processes in NW Turkey. , 2004, ss.97 - 143.
AMA PICKETT E,ROBERTSON A Significance of the volcanogenic Nilüfer Unit and related components of the Triassic Karakaya Complex for Tethyan subduction/Accretion processes in NW Turkey. . 2004; 97 - 143.
Vancouver PICKETT E,ROBERTSON A Significance of the volcanogenic Nilüfer Unit and related components of the Triassic Karakaya Complex for Tethyan subduction/Accretion processes in NW Turkey. . 2004; 97 - 143.
IEEE PICKETT E,ROBERTSON A "Significance of the volcanogenic Nilüfer Unit and related components of the Triassic Karakaya Complex for Tethyan subduction/Accretion processes in NW Turkey." , ss.97 - 143, 2004.
ISNAD PICKETT, Elizabeth A. - ROBERTSON, Alastair H.F.. "Significance of the volcanogenic Nilüfer Unit and related components of the Triassic Karakaya Complex for Tethyan subduction/Accretion processes in NW Turkey". (2004), 97-143.
APA PICKETT E, ROBERTSON A (2004). Significance of the volcanogenic Nilüfer Unit and related components of the Triassic Karakaya Complex for Tethyan subduction/Accretion processes in NW Turkey. Turkish Journal of Earth Sciences, 13(2), 97 - 143.
Chicago PICKETT Elizabeth A.,ROBERTSON Alastair H.F. Significance of the volcanogenic Nilüfer Unit and related components of the Triassic Karakaya Complex for Tethyan subduction/Accretion processes in NW Turkey. Turkish Journal of Earth Sciences 13, no.2 (2004): 97 - 143.
MLA PICKETT Elizabeth A.,ROBERTSON Alastair H.F. Significance of the volcanogenic Nilüfer Unit and related components of the Triassic Karakaya Complex for Tethyan subduction/Accretion processes in NW Turkey. Turkish Journal of Earth Sciences, vol.13, no.2, 2004, ss.97 - 143.
AMA PICKETT E,ROBERTSON A Significance of the volcanogenic Nilüfer Unit and related components of the Triassic Karakaya Complex for Tethyan subduction/Accretion processes in NW Turkey. Turkish Journal of Earth Sciences. 2004; 13(2): 97 - 143.
Vancouver PICKETT E,ROBERTSON A Significance of the volcanogenic Nilüfer Unit and related components of the Triassic Karakaya Complex for Tethyan subduction/Accretion processes in NW Turkey. Turkish Journal of Earth Sciences. 2004; 13(2): 97 - 143.
IEEE PICKETT E,ROBERTSON A "Significance of the volcanogenic Nilüfer Unit and related components of the Triassic Karakaya Complex for Tethyan subduction/Accretion processes in NW Turkey." Turkish Journal of Earth Sciences, 13, ss.97 - 143, 2004.
ISNAD PICKETT, Elizabeth A. - ROBERTSON, Alastair H.F.. "Significance of the volcanogenic Nilüfer Unit and related components of the Triassic Karakaya Complex for Tethyan subduction/Accretion processes in NW Turkey". Turkish Journal of Earth Sciences 13/2 (2004), 97-143.
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09-05-2024 16:10

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