Ladik ve Esirağıl Alanı (Konya, Orta Anadolu) Yöresindeki Geç Silüriyen Erken Karbonifer Yaşlı Metakarbonatların Metamafik Dayklarla Kontak Metamorfizması

Year 2022, , 903 - 911, 03.12.2022

Kerim Kocak , Adnan Döyen

https://doi.org/10.36306/konjes.1124048

Abstract

Konya’nın KKB’da dayk topluluğu veya muhtemelen dayk oluşturan magmanın yerleşimi ile gelişen bir dizi normal faylar tarafından kesilmiş izole çizgisel dayklar şeklinde mafik kayaçlar oluşur. Faylanmış Triyas yaşlı metamafik dayklara komşu Silüryen-Erken Karbonifer yaşlı metakarbonatlar ve sokulumdaki çatı askıları içerisinde, ilk kez su içermiyen oksitlenmiş Ca’ca zengin bazı skarn zonları belirlenmiştir. Metamafik kayaçların, sınırlı skarn zonunun gelişimine neden olan düşük sıcaklığa ve az miktarda (veya yok) kristalleşme sıcaklığına sahip olduğu ileri sürülmüştür. Mineralojik çalışmalar, skarnın granat, manyetit/hematit, klorit ve serisitten oluştuğunu gösterir. Manyetit/hematit mineralleri, klorit ve açık renkli mineraller tarafında kemirilebilen veya götit tarafından çevrilen, çoğunlukla 0.5 cm uzunluğa kadar gelişmiş özşekilli kristaller şeklinde oluşur. Granat tipik olarak ~1.5 mm boyuta kadar ulaşan harikulade özşekilli iri kristaller şeklinde oluşur. Bölgede klorit ve serisitin varlığı ve hornblend, biyotit ve vollastonitin yokluğu kontakt metamorfizmanın düşük basınç, nispeten düşük sıcaklık (albit-epidot hornfels) ve/veya yüksek CO2 şartlarında yer aldığına işaret eder.

Keywords

Skarn, dayk topluluğu, granat, Konya, dyke swarm, garnet

CONTACT METAMORPHISM OF LATE SILURIAN-EARLY CARBONIFEROUS METACARBONATES BY METAMAFIC DYKES AROUND LADIK AND ESIRAĞIL AREA (KONYA, CENTRAL TURKEY)

Abstract

In NNW Konya, mafic rocks form as dyke swarm or isolated linear dykes, which are cut by a series of normal faults that developed possibly by emplacement of the dyke-forming magma. Some anhydrous oxidized calcic skarn zones have ever been found out in Silurian-Early Carboniferous metacarbonates next to the Triassic metamafic dykes faulted, and in roof pendants within the intrusion. The metamafic rocks are suggested to have a low temperature and a small amount (or even absence) of the heat of crystallization, which causes the development of a restricted skarn zone. Mineralogical studies show that the skarn contains garnet, magnetite/hematite, chlorite, and sericite. The magnetite/hematite minerals form mostly as large euhedral crystals, up to 0.5 cm in length, which may be resorbed by chlorite and felsic minerals or rimmed by goethite. The garnet typically forms as spectacular euhedral large crystals, up to ~1.5 mm in size. The existence of chlorite and sericite, and the lack of hornblende, biotite and wollastonite in the region indicate that contact metamorphism took place under low pressure, relatively low temperatures (albite-epidote hornfels) and/or high CO2 conditions in the area.

Keywords

Skarn, dyke swarm, garnet, Konya.

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