Bozdağ Formasyonu (Ladik-Konya) Karbonatlarının Petrografik ve Jeokimyasal Özelliklerine Göre Diyajenetik Gelişimi

Bu çalışmada Konya kuzeybatısındaki Bozdağ Formasyonu (Silüriyen-Orta Devoniyen) karbonatlarının petrografik ve jeokimyasal özelliklerinin belirlenmesi amaçlanmıştır. İnceleme alanında temeli oluşturan bu karbonatlar resifal karmaşık şeklinde gelişmiştir. Gri, krem renkli, orta-çok kalın tabakalanmalı bu karbonatlar, dolotaşı, kalsitik dolotaşı, kireçtaşı ve dolomitik kireçtaşı şeklindedirler. Bu karbonatlar mikrofasiyes olarak, dolomiksparit, kristalin kireçtaşı, dolosparit ve vaketaşı, istiftaşı özelliğindedir. Karbonatların Sr içeriği düşük olup (6-211 ppm) gömülme dolomitlerinin Sr değerleri ile tutarlıdır. Na içeriği de gömülme dolomitlerinin Na içeriği ile tutarlıdır (148-371 ppm). Bu karbonatların Fe (699-3287 ppm) ve Mn (0-232 ppm) içerikleri yüksek olup gömülme dolomitlerinin Fe ve Mn içeriği ile tutarlıdır. Çalışılan karbonatların majör ve iz element değerleri diyajenetik alterasyonu ve havzaya önemsiz miktarda terrijen girdisini işaret etmektedir. Bu karbonatların önemli bileşenini oluşturan dolotaşı örnekleri replase edilen kireçtaşları gibi, Kuzey Amerika Şeyl Kompozisyonuna göre nadir toprak elementlerince fakirdirler. Dolomitlerin nadir toprak element içeriği karbonat safhasıyla ilişkili olmayıp, detritik alumino-silikat ile demir bulunduran mineraller safhasıyla kontrol edilmiştir. Bozdağ dolomitlerinde gözlenen didolomitleşmenin sığ gömülme ortamında oksitleyici meteorik suların etkisiyle oluştuğu sonucuna varılmıştır.

Anahtar Kelimeler:

Didolomit, dolotaşı, gömülme, kireçtaşı, replasif, Dedolomite, dolostone, burial, limestone, replacement

Diagenetic Development of Bozdağ Formation (Ladik-Konya) Carbonates According to Petrographic and Geochemical Properties

This study, it was aimed to determine the petrographic and geochemical properties of Silurian-Middle Devonian carbonates in the northwest of Konya. These carbonates, which form the basis of the study area, have developed as a reefal complex. These gray, cream-colored, medium to very thick-bedded carbonates are in the form of dolostone, calcitic dolostone, limestone, and dolomitic limestone. As microfacies, these carbonates are dolomicsparite, crystalline limestone, dolosparite, wackestone, and packstone. The Sr content of the carbonates is low (6-211 ppm) and is consistent with the Sr values of the burial dolomites. The Na content (148-371 ppm) is also consistent with the Na content of the burial dolomites. The Fe (699-3287 ppm) and Mn (0-232 ppm) contents of these carbonates are high, consistent with the Fe and Mn contents of the burial dolomites. Major and trace element properties of the studied carbonates indicate diagenetic alteration and insignificant terrigenous input into the basin. Dolostone samples, which constitute the important component of these carbonates, show impoverishment by rare earth elements, like the replaced limestones. The rare earth element content of the dolomites was not related to the carbonate phase but was controlled by the detrital alumino-silicate (eg. clay minerals such as feldspar and kaolinite) and iron-containing minerals (eg. pyrite and possibly ankerite or siderite) phase. It was concluded that the dedolomitization observed in the Bozdağ dolomites was formed by the effect of oxidizing meteoric waters in the shallow burial environment.

Keywords:

Dedolomite, dolostone, burial, limestone, replacement,

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