Stratigraphy of the volcanic products around Nemrut caldera: Implications for reconstruction of the caldera formation

Özgür KARAOĞLU, (Dokuz Eylül Üniversitesi, Mühendislik Fakültesi, Jeoloji Mühendisliği Bölümü, İzmir, Türkiye)
Yavuz ÖZDEMİR, (ODTÜ Müh. Fakültesi, Jeoloji Müh. Bölümü, Ankara, Türkiye)
Ümit TOLLUOĞLU, (Yüzüncü Yıl Üniversitesi, Mühendislik Mimarlık Fakültesi, Jeoloji Mühendisliği Bölümü, Van, Türkiye)
Mustafa KARABIYIKOĞLU, (Yüzüncü Yıl Üniversitesi, Antropoloji Bölümü, Van, Türkiye)
Onur KÖSE, (Yüzüncü Yıl Üniversitesi, Mühendislik Mimarlık Fakültesi, Jeoloji Mühendisliği Bölümü, Van, Türkiye)
Jean-Luc FROGER (Blaise Pascal Univercity OPGC (Cantre de Recherce Volcanologique), 5 Rue Kessler, 63038 Clermont-Ferrand, France)
Turkish Journal of Earth Sciences
15 0
Yıl: 2005 Cilt: 14 Sayı: 2 Sayfa Aralığı: 123 - 143 Metin Dili: Türkçe İndeks Tarihi: 29-07-2022

Stratigraphy of the volcanic products around Nemrut caldera: Implications for reconstruction of the caldera formation

Öz:
Van gölünün GB'sında (Doğu Anadolu) yer alan Nemrut stratovolkanı'nın volkanolojik gelişimi, kaldera öncesi evre, kaldera sonrası evre ve geç evre olmak üzere üç aşamada incelenmiştir. Nemrut volkanizmasına bağlı gelişen ve kaldera öncesi evreye ait iki ignimbirit birimi belirlenmiştir, ilk ignimbirit akması, açılma çatlakları boyunca gerçekleşen ve volkanizmanın ilk ürünleri olan bazaltik lav akmalarının ardından meydana gelmiştir. Nemrut kalderasının oluşumunu tetikleyen en önemli volkanik malzemelerden biri olan ana ignimbirit akması ise makalenin asıl konusunu teşkil etmektedir. Kaldera öncesi evredeki Nemrut stratovolkanına ait pirokiastik ürünler, paleo-toprak gözlemleriyle 3 faz halinde incelenmiştir. İlk faz, pliniyen geri düşüşler ve pomza akışından oluşmaktadır. Ana ignimbirit ikinci faz içerisinde yer almakta olup pomza ve litik içerikleri, derecelenmeleri, büyüklükleri, kaynaşma dereceleri ile renkleri göz önünde bulundurularak 3 seviye halinde incelenmiştir. Üçüncü faz ise pliniyen pomza ve kül geri düşme ürünlerinden oluşmuştur. Pirokiastik ürünler içerisinde gözlenen iki ayrı paleo-toprak oluşumu, volkanizmanın kaldera oluşmadan önce belirli aralıklarda suskunluğuna işaret etmektedir. Nemrut kalderasi oluşumunun 62.6 km3 hacminde pirokiastik malzemenin püskürmesi sonucu gerçekleştiği düşünülmektedir.
Anahtar Kelime:

Konular: Jeoloji

Nemrut kalderası çevresindeki volkanik ürünlerin stratigrafisi kaldera oluşumu açısından anlamı

Öz:
The volcanological development of the Nemrut stratovolcano, located near the southwestern tip of Lake Van in eastern Turkey, is subdivided into three stages: pre-caldera, post-caldera and late stages. Two ignimbrite flows have been recognized in the pre-caldera stage. The earlier of the two occurred after basaltic lavas formed along extensional fissures. The latter, which forms the main subject of this paper, was a major flow associated with the development of the Nemrut caldera. The pyroclastic deposits of the Nemrut volcano in the pre-caldera stage are divided into three phases on the basis of palaeosols that separate them. The first phase includes plinian pumice falls and a pyroclastic flow deposit. The major ignimbrite occurs in the second pyroclastic phase and is here subdivided into three sub-layers based on colour, internal grading, size of pumice and lithic clasts, and the degree of welding. The third and last pyroclastic phase was dominated by plinian pumice and ash-fall deposits. The occurrence of palaeosols between pyroclastic phases suggests that there were periods of inactivity between the eruptions. Formation of the Nemrut caldera is thought to have resulted from eruptions of pyroclastic materials with a volume of about 62.6 km3.
Anahtar Kelime:

Konular: Jeoloji
Belge Türü: Makale Makale Türü: Araştırma Makalesi Erişim Türü: Erişime Açık
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APA KARAOĞLU Ö, Özdemir Y, TOLLUOĞLU Ü, KARABIYIKOĞLU M, KÖSE O, FROGER J (2005). Stratigraphy of the volcanic products around Nemrut caldera: Implications for reconstruction of the caldera formation. , 123 - 143.
Chicago KARAOĞLU ÖZGÜR,Özdemir Yavuz,TOLLUOĞLU Ümit,KARABIYIKOĞLU Mustafa,KÖSE Onur,FROGER Jean-Luc Stratigraphy of the volcanic products around Nemrut caldera: Implications for reconstruction of the caldera formation. (2005): 123 - 143.
MLA KARAOĞLU ÖZGÜR,Özdemir Yavuz,TOLLUOĞLU Ümit,KARABIYIKOĞLU Mustafa,KÖSE Onur,FROGER Jean-Luc Stratigraphy of the volcanic products around Nemrut caldera: Implications for reconstruction of the caldera formation. , 2005, ss.123 - 143.
AMA KARAOĞLU Ö,Özdemir Y,TOLLUOĞLU Ü,KARABIYIKOĞLU M,KÖSE O,FROGER J Stratigraphy of the volcanic products around Nemrut caldera: Implications for reconstruction of the caldera formation. . 2005; 123 - 143.
Vancouver KARAOĞLU Ö,Özdemir Y,TOLLUOĞLU Ü,KARABIYIKOĞLU M,KÖSE O,FROGER J Stratigraphy of the volcanic products around Nemrut caldera: Implications for reconstruction of the caldera formation. . 2005; 123 - 143.
IEEE KARAOĞLU Ö,Özdemir Y,TOLLUOĞLU Ü,KARABIYIKOĞLU M,KÖSE O,FROGER J "Stratigraphy of the volcanic products around Nemrut caldera: Implications for reconstruction of the caldera formation." , ss.123 - 143, 2005.
ISNAD KARAOĞLU, ÖZGÜR vd. "Stratigraphy of the volcanic products around Nemrut caldera: Implications for reconstruction of the caldera formation". (2005), 123-143.
APA KARAOĞLU Ö, Özdemir Y, TOLLUOĞLU Ü, KARABIYIKOĞLU M, KÖSE O, FROGER J (2005). Stratigraphy of the volcanic products around Nemrut caldera: Implications for reconstruction of the caldera formation. Turkish Journal of Earth Sciences, 14(2), 123 - 143.
Chicago KARAOĞLU ÖZGÜR,Özdemir Yavuz,TOLLUOĞLU Ümit,KARABIYIKOĞLU Mustafa,KÖSE Onur,FROGER Jean-Luc Stratigraphy of the volcanic products around Nemrut caldera: Implications for reconstruction of the caldera formation. Turkish Journal of Earth Sciences 14, no.2 (2005): 123 - 143.
MLA KARAOĞLU ÖZGÜR,Özdemir Yavuz,TOLLUOĞLU Ümit,KARABIYIKOĞLU Mustafa,KÖSE Onur,FROGER Jean-Luc Stratigraphy of the volcanic products around Nemrut caldera: Implications for reconstruction of the caldera formation. Turkish Journal of Earth Sciences, vol.14, no.2, 2005, ss.123 - 143.
AMA KARAOĞLU Ö,Özdemir Y,TOLLUOĞLU Ü,KARABIYIKOĞLU M,KÖSE O,FROGER J Stratigraphy of the volcanic products around Nemrut caldera: Implications for reconstruction of the caldera formation. Turkish Journal of Earth Sciences. 2005; 14(2): 123 - 143.
Vancouver KARAOĞLU Ö,Özdemir Y,TOLLUOĞLU Ü,KARABIYIKOĞLU M,KÖSE O,FROGER J Stratigraphy of the volcanic products around Nemrut caldera: Implications for reconstruction of the caldera formation. Turkish Journal of Earth Sciences. 2005; 14(2): 123 - 143.
IEEE KARAOĞLU Ö,Özdemir Y,TOLLUOĞLU Ü,KARABIYIKOĞLU M,KÖSE O,FROGER J "Stratigraphy of the volcanic products around Nemrut caldera: Implications for reconstruction of the caldera formation." Turkish Journal of Earth Sciences, 14, ss.123 - 143, 2005.
ISNAD KARAOĞLU, ÖZGÜR vd. "Stratigraphy of the volcanic products around Nemrut caldera: Implications for reconstruction of the caldera formation". Turkish Journal of Earth Sciences 14/2 (2005), 123-143.
Sayfa Oluşturulma Tarihi
22-04-2024 11:16

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