Gökçeyazı-Kuskuncuk (Ereğli-Konya) çevresindeki görsel stromatolitlerin fasiyes özellikleri
Küçük Resim Yok
Tarih
2004
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Yayıncı
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Gökçeyazı-Kuskuncuk (Ereğli-Konya) yöresinde yer alan inceleme alanındaki Miyosen yaşlı stromatolitik kireçtaşı fasiyeslerinin incelenmesini amaçlayan bu çalışmada Logan ve diğ.(l964)'e göre yan yana bağlı yan küresel stromatolitler (LLH-tipli stromatolitler), üst üste yığılı yarı küresel stromatolitler (SH-tipli stromatolitler) ve onkoyidler (SS-tipli stromatolitler) gözlenmiştir. Su seviyesindeki ve enerjisindeki dalgalanmalara bağlı olarak oluşan LLH, SH ve SS tipli stromatolitlerin gelişiminde mavi-yeşil alglerden Schizothrix sp., Scytonema sp. ve Phormidium sp. etkili olurken, ortamda bulunan yeşil alglerden Chara sp. de mikritik matriks çökelimine katkıda bulunmuştur. Ayrıca mikrobiyolojik faaliyetler sonucu (bakteri kökenli) bazı onkoyidlerde iç yapı kısmen ya da tamamen kaybolmuştur. Stromatolitik kireçtaşlarının bazı düzeylerinde Miyosen esnasında etkinleşen blok faylanmalarla oluşan kırıklar boyunca göl tabanına sızan hidrotermal getirimlere ve/veya çevrede bulunan volkanik kayaçlardan karasal yıkanmaya bağlı olarak gelişen silisli sinter yanı sıra, kök yumakları, pencere yapısı ile pelletli, intraklastlı ve biyoklastlı düzeyler de gözlenmiştir. Yan yana bağlı yan küresel stromatolit fasiyesi, üst üste yığılı yarı küresel stromatolit fasiyesi, onkoyidal stromatolit fasiyesi, intraklast-pellet-ooid tanetaşıl istif taşı, pellet-intraklast-biyojen vaketası/istiftaşı fasiyesi ve silisli sinter kabuk fasiyesi şeklinde beş fasiyese ayrılarak incelenen stromatolitik kireçtaşları, evaporitlerin (jips) çökelimine elverişli bir gölün jips çökelmesi, mevsimsel ve iklimsel olarak tatlı su beslenimiyle tuzluluğun azalması sonucu az tuzlu göl ortamında çökelime başlayıp, gölün tamamen tatlı sulu hale gelmesiyle çökelime devam etmiş ve gölün kurumasıyla da çökelimini tamamlamıştır.
In this study, the investigation of Miocene aged limestone fades located at Gökçeyazı-Kuskuncuk (Ereğli-Konya) has been aimed. According to the Logan at al (1964) classification the stromatolite types of lateral linked hemispheroidal (LLH type), stacked hemispheroidal (SH type) and onkoides (SS type) have been observed in the region. While thefluxiation of water level and energy have an important role on the formation of the LLH, SH and SS type stromatolites which are related to the blue-green algae such as Schizothrix sp., Scytonema sp. and Phormidium sp., the greenalgae Chara sp. in the environment helped the sedimentation of micritic matrix. On the other hand, as a result of microbiological activity, internal structure of some onkoides has partly or wholly destroyed. Siliceous sinter as well as root ball, fenestra and the levels of pellet-intraclast-bioclast have been observed in some of the levels of stromatolitic limestones which were found in the interface of fault blocks. The channelled hydrothermal and/or volcanic fluids in turnby these fault blocks are responsible from the formation of siliceous sinter. The stromatolitic limestones were divided, into five facies such as (1) lateral linked hemispheroidal stromatolite facies, (2) stacked hemispheroidal stromatolite facies, (3) oncoidal stromatolite facies, (4) intraclast-pellet-ooid grainstone/packstone, pellet-intraclast-biogene wackestone/packstone facies, and (5) crustal facies of siliceous sinter and all these occurrences have been formed in an evaporite lake which were filled by freshwater depending on the seasonal variations, the sedimentation were ended at the end of drying of lake.
In this study, the investigation of Miocene aged limestone fades located at Gökçeyazı-Kuskuncuk (Ereğli-Konya) has been aimed. According to the Logan at al (1964) classification the stromatolite types of lateral linked hemispheroidal (LLH type), stacked hemispheroidal (SH type) and onkoides (SS type) have been observed in the region. While thefluxiation of water level and energy have an important role on the formation of the LLH, SH and SS type stromatolites which are related to the blue-green algae such as Schizothrix sp., Scytonema sp. and Phormidium sp., the greenalgae Chara sp. in the environment helped the sedimentation of micritic matrix. On the other hand, as a result of microbiological activity, internal structure of some onkoides has partly or wholly destroyed. Siliceous sinter as well as root ball, fenestra and the levels of pellet-intraclast-bioclast have been observed in some of the levels of stromatolitic limestones which were found in the interface of fault blocks. The channelled hydrothermal and/or volcanic fluids in turnby these fault blocks are responsible from the formation of siliceous sinter. The stromatolitic limestones were divided, into five facies such as (1) lateral linked hemispheroidal stromatolite facies, (2) stacked hemispheroidal stromatolite facies, (3) oncoidal stromatolite facies, (4) intraclast-pellet-ooid grainstone/packstone, pellet-intraclast-biogene wackestone/packstone facies, and (5) crustal facies of siliceous sinter and all these occurrences have been formed in an evaporite lake which were filled by freshwater depending on the seasonal variations, the sedimentation were ended at the end of drying of lake.
Açıklama
Anahtar Kelimeler
Jeoloji
Kaynak
Geosound
WoS Q Değeri
Scopus Q Değeri
Cilt
-1
Sayı
44-45
