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ERKEN MİYOSEN ALAÇAMDAĞ (DURSUNBEY-BALIKESİR) MAGMATİK KOMPLEKSİNİN JEOLOJİSİ VE BATI ANADOLU GENLEŞME TEKTONİĞİNDEKİ KONUMU

Journal Name:

  • Maden Tetkik ve Arama Dergisi

Publication Year:

  • 2010

Key Words:

Keywords (Original Language):

Author NameUniversity of AuthorFaculty of Author
Abstract (2. Language): 
Extensional regime in western Anatolia caused development of metamorphic core complexes, NE-and E-W-trending basins and emplacement of magmatic rocks since Late Oligocene and Early Miocene. The Alaçamdağ magmatic complex, which is located to the west of the Simav metamorphic core complex, includes significant data that highlight the style of extensional regime in western Turkey. It consists of Early Miocene granitic intrusions and volcanic rocks with variable compositions ranging from basalt to rhyolite. The granitic intrusions that were emplaced into the basement rocks of the Menderes Massive and izmir-Ankara Zone are divided into two facies based on their lithological and textural characteristics: Musalar and Alaçam granites. The Musalar granite has typical holocystalline equigranular texture, while the Alaçam granite is characterised by its porphyritic texture defined by abundant K-feldspar megacrysts. Both granite units were locally transformed into mylonites along shear zones. Volcanic rocks consist of Sağırlar volcanic unit and felsic volcanic rocks. Sağırlar volcanic unit is made up of andesitic/dacitic intrusions, domes, lava flows, dykes and volcanogenic sedimentary rocks. The felsic volcanic rocks, which unconformably overlies the Sağırlar volcanic unit, consist of ignimbrite, dacite and rhyolite. These rocks have transitional contacts with alluvial/lacustrine sedimentary deposits. Ductile deformation on the granitic rocks, intra-basinal unconformities and syn-sedimentary deformational structures within the deposits are closely associated with the development of extensional regime during Early Miocene in western Turkey.
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Abstract (Original Language): 
Batı Anadolu'da genleşme rejimi, Geç Oligosen - Erken Miyosen'den günümüze kadar metamorfik çekirdek kompleksleri, KD/B-D doğrultulu tortul havzaların gelişimine ve magmatik kayaçların yerleşimine neden olmuştur. Erken Miyosen'de etkin olduğu bilinen Simav metamorfik çekirdek kompleksinin batı kenarında yer alan Alaçamdağ magmatik kompleksi, gerilme tektoniğini aydınlatacak veriler içerir. Kompleks, Erken Miyosen yaşlı granitik sokulumlar ile andezitten riyolite kadar bileşimdeki volkanik kayaçlardan oluşur. Menderes Masifi ve izmir-Ankara Zonu kayaçlarını kesen granitik sokulumlar, litolojik ve dokusal özelliklerine göre Musalar ve Alaçam gra¬nitleri olmak üzere iki farklı fasiyese ayrılmaktadır. Musalar graniti tipik holokristalin tanesel dokuya sahiptir. Alaçam graniti ise K-feldispat megakristalleri ile belirlenen porfiritik doku ile temsil edilir. Her iki granitik birim yer yer makaslama zonları boyunca milonitlere dönüşmüşlerdir. Volkanik kayaçlar ise Sağırlar volkanik birimi ve fel-sik volkanik kayaçlar olmak üzere iki birim olarak tanımlanmıştır. Sağırlar volkanik birimi, andezit ve dasit bileşim-li intrüzyonlar, domlar, lav akıntıları, dayklar ve volkanojenik tortul kayaçlardan oluşmaktadır. Sağırlar volkanik bi¬rimi üzerine uyumsuz olarak gelen felsik volkanik kayaçlar ise ignimbrit, dasit ve riyolitlerden meydana gelir. Bu kayaçlar, alüvyal-gölsel tortul kayaçlarla yanal ve düşey girik dokanak ilişkileri gösterirler. Gerek sünümlü defor-masyon gösteren granitlerin varlığı gerekse tortul/volkanik istifler içerisinde yer alan havza içi açısal uyumsuzluk¬lar ile sin-sedimanter deformasyon yapıları bölgenin Erken Miyosen'de etkin olarak genleşmeli tektonik rejime maruz kaldığını göstermektedir.
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Bu çalışma, Türkiye Bilimsel ve Teknolojik Araştırma Kurumu (TÜBİTAK) projesi (Proje no: 104Y274) tarafından desteklenmiştir.
Yayına verildiği tarih, 29 Haziran 2009
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