Ayvacık (Çanakkale) bentonit yataklarındaki baydellit oluşumu

Baydellit, oktahedral katmanında esas olarak alüminyum içeren bir dioktaedral smektit mineralidir. Miyosen yaşlı volkanik kayaçlar içinde bulunan Ayvacık (Çanakkale) bentonit yataklarında baydellit oluşumu saptanmıştır. Bölgedeki volkanik kayaçlar başlıca bol kırıklı andezit, trakiandezit ve çok gözenekli tüflerden meydana gelir. Çalışma bölgesinde; hidrotermal sıvılar kırık sistemleri boyunca yükselerek volkanik kayaçları bentonitleştirmiştir. Baydellit minerali, bentonitleşme arasında özellikle andezitik kayaçlardaki plajioklasların ve camsı tüflerin alterasyon ürünü olarak meydana gelmiştir. X-ışınları incelemelerinde baydellitin düzensiz yapılı olduğu, montmorillonit ile birlikte bulunduğu ve kil boyutu diğer mineraller olarak illit, kaolinit, halloysit ve kristobalit varlığı tespit edilmiştir.

Occurence of beidellite in Ayvacık (Çanakkale) bentonite deposits

Beidellite is a dioctahedral smectite mineral, which contains principally (Al) ions in octahedral site. Beidellite mineral was found in the Ayvacık bentonite deposits, which were formed within Miocene volcanic rocks. In the Ayvacık region; volcanic rocks are composed of mainly highly fractured andesite, trachyandesite and highly porous tuffs. In the study area, hydrothermal solutions ascended through the fracture systems and altered volcanic rocks to bentonite. During bentonitization, beidellite mineral was occurred as an alteration product of plagioclase in andesitic rocks and vitric tuffs. X-ray diffraction data indicate an unusually ordered layer stacking arrangement ofbeidellite. Minor amount ofillite, halloysite, kaolinite and cristobalite were determined during X-ray diffraction analysis of clay size.

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