Comparison of The Geochemical Characteristics of Late Cretaceous Alkalen Volcanic Rocks From The Southern Border of Sakarya Zone

Yıl 2019, Cilt: 9 Sayı: 1, 1 - 15, 15.01.2019

Cüneyt Şen , Emre Aydınçakır , Ufuk Celal Yağcıoğlu Tülay Bak

https://doi.org/10.17714/gumusfenbil.400097

Cited By: 1

Öz

Alkaline volcanics exposed at similar stratigraphic levels in Upper
Cretaceous at Bayburt, Amasya-Gümüşhacıköy and Ankara-Kalecik locations along
the southern boundary of the Sakarya Zone provide macroscopically two different
lithologies which are containing large pyroxene porphyries and large
analcimized leucite porphyries. These rocks formed as a result of the low-grade
partial melting of the metasomatized phlogopite-rich mantle rocks, which
resulted in the step subduction angle of the aged oceanic crust before the
collision. In the course of following their cases, in the middle / shallow
depths of the crust, in the magma chambers they underwent differentiation and
reached two different lithologies. 

Anahtar Kelimeler

Alkaline volcanism, Analcimized leucite, Sakarya Zone, Upper Cretaceous

Sakarya Zonunun Güney Kesiminde Yüzeylenen Geç Kretase Alkalen Volkanitlerinin Jeokimyasal Özelliklerinin Karşılaştırılması

Öz

Sakarya Zonunun güney kesiminde Bayburt, Amasya-Gümüşhacıköy ve
Ankara-Kalecik lokasyonlarında Üst Kretase’nin son dönemlerinde benzer
stratigrafik seviyelerde yüzeylenen alkalen volkanitler makroskobik olarak iri
analsimleşmiş lösit porfirleri ve iri piroksen porfirleri içeren iki farklı
litoloji sunarlar. Bu kayaçlar çarpışma öncesi yaşlı okyanus kabuğunun yitim
açısının dikleşmesi sonucu, metasomatizmaya uğramış flogopitce zengin manto
kayaçlarının düşük dereceli kısmi ergimesi sonucu oluşan kaynak magmalardan
itibaren oluşmuşlardır. Oluşumlarını izleyen süreçte alkalen magma, kabuk
içerisindeki orta/sığ derinliklerdeki magma odalarında diferansiyasyona
uğrayarak, iki farklı litolojide yeryüzüne ulaşmışdır. 

Anahtar Kelimeler

Alkalen volkanizma, Analsimleşmiş lösit, Sakarya Zonu, Üst Kretase

Kaynakça

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