Late Cretaceous successive pelagic neptunian dike infillings within the middle-upper Cenomanian platform limestones of the eastern part of the Bey Dağları Carbonate Platform (Katran Dağ, Antalya, SW Turkey)

Yıl 2019, , 35 - 71, 16.04.2019

Bilal Sarı

https://doi.org/10.17824/yerbilimleri.501506

Öz

Shallow marine Jurassic-Cretaceous carbonate succession is represented by abundant rudist bearing middle-late Cenomanian platform limestones (Yağca Köy Formation) at the top in the Katran Dağ area, which corresponds to the eastern part of the Bey Dağları Autochthon. Micritic pelagic neptunian dike infillings were first identified within the limestones accumulated in a platform edge environment in this study. Planktonic foraminifera and calcispheres observed in the infillings suggest a deeper marine conditions. These infillings were emplaced at least at three different times. The planktonic foraminiferal assemblages observed within the D2 and D3 infillings indicate that the infillings occurred during the late Coniacian-Santonian and latest Campanian Maastrichtian times. Although the D1 infilling predates the D2, the age can not be determined as the infilling does not have planktonic foraminifera. Likewise, the age of the infillings D4, D5 and D6 cutting the host rock of neritic limestones or D2 infilling can not be determined as well because of absence of planktonic foraminifera. Hovewer, facies characteristics of some parts of the infilling D4 are more or less similar to the infilling D3. Facies types and planktonic foraminiferal assemblages observed in the infillings D2 and D3 are similar to those documented in the widespread pelagic successions throughout the northern part of the Bey Dağları Autochthon. These data show that the onset and development of the pelagic deposition occurred in the eastern part of the platform as in the northern part. The pelagic deposits accumulated in the eastern part of the platform should have been eroded during the post Santonian and latest Maastrichtian erosional events. As the neptunian dike infillings are mostly associated with the platform drowning events as a result of extensional tectonics, the data obtained in this study suggest that this part of the platform was drowned during the late Coniacian-Santonian and latest Campanian-Maastrichtian as in the northern part of the platform. 

Anahtar Kelimeler

Neptunian dike, carbonate platform, planktonic foraminifera, Upper Cretaceous, Katran Dağ, Bey Dağları Autochthon, SW Turkey

Bey Dağları Karbonat Platformu’nun doğu bölümünde orta-üst Senomaniyen platform kireçtaşlarında Geç Kretase yaşlı ardışık pelajik neptüniyen dayk dolguları (Katran Dağ, Antalya, GB Türkiye)

Öz

Bey
Dağları Otoktonu’nun doğu bölümüne karşılık gelen Katran Dağ alanında sığ
denizel Jura-Kretase karbonat istifi en üstte orta-geç Senomaniyen yaşlı bol
rudistli platform kireçtaşları (Yağca Köy Formasyonu) ile temsil edilir.
Platform kenarı ortamında çökelmiş kireçtaşlarında daha derin ortamı işaret
eden planktonik foraminifer ve kalsisifer içeren en az üç farklı mikritik neptüniyen
dayk dolgusu tanımlanmıştır. D2 ve D3 dolgularında tanımlanan planktonik
foraminifer toplulukları, dolguların geç Koniasiyen-Santoniyen ve en geç
Kampaniyen-Maastrihtiyen’de gerçekleştiğini gösterir. D2 dolgusundan daha önce
gerçekleşen D1 dolgusunun yaşı planktonik foraminifer içermemesi nedeniyle
belirlenememektedir. Benzer şekilde, neritik kireçtaşları veya D2 dolgusundan
oluşan yan kayacı kesen D4, D5 ve D6 dolguları da karakteristik planktonik
foraminifer içermemeleri nedeniyle yaşlandırılamamaktadır. Ancak, özellikle D4
dolgusunun bazı bölümlerinin fasiyes özellikleri D3 dolgusu ile az çok
benzerdir. D2 ve D3 dolgularında tanımlanan fasiyes ve planktonik foraminifer
toplulukları Bey Dağları Otoktonu’nun kuzey bölümünde yaygın yüzlekleri bulunan
pelajik istifler ile oldukça benzerdir. Bu veri platformun kuzey bölümünde gözlenen
pelajikleşmenin platformun doğu bölümünde de gerçekleştiğini gösterir.
Platformun doğu bölümünde, Santoniyen sonrası ve Maastrihtiyen sonunda
gerçekleşen aşınma dönemlerinde pelajik istifler aşınmış olmalıdır. Neptüniyen
dayk dolguları çoğunlukla genleşme tektoniğine bağlı olarak gelişen platform
boğulmaları ile ilişkili olmaları nedeniyle, platformun bu bölümünün de kuzey
bölümde olduğu gibi geç Koniasiyen-Santoniyen ve en geç
Kampaniyen-Maastrihtiyen’de boğulduğunu gösterir.

Anahtar Kelimeler

Neptüniyen dayk, karbonat platformu, planktonik foraminifer, Üst Kretase, Katran Dağ, Bey Dağları Otoktonu

Kaynakça

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