Investigation of Carbon Dioxide Storage Potential of Orhaneli Ophiolite: Experimental Findings

Abstract

In our age, innovative solutions are needed to reduce carbon emissions to combat climate and ecology crises. Pioneering studies in the last 30 years have shown that carbonate minerals, which theoretically form as a natural result of atmosphere-lithosphere interaction processes, have great potential for permanent disposal of atmospheric carbon dioxide. However, there is a need for local studies in order to make approaches about which rock types and under which conditions secondary carbonation can be performed most effectively for applications of geological removal of atmospheric carbon dioxide. Turkey, located in the Alpine-Himalayan orogenic belt, has widely distributed ophiolitic series and accretionary complexes that contain mafic-ultramafic lithologies representing the remnants of Tethys ocean(s). The Orhaneli ophiolite around Bursa, NW Anatolia, comprises of the characteristic lithologies for ophilitic series such as dunite, harzburgite, clinopyroxenite, gabbro and serpantinites as well as various size of schist and limestone blocks with radiolorite chert and tuffs. Dunite samples, exhibiting different weathering profiles and alteration degrees, have a general mineralogical composition of olivine, orthopyroxene, magnetite, serpentine, talc, spinel and clay minerals. Within the scope of this study, batch reactor experiments were carried out on samples collected from the Orhaneli (Bursa) ophiolitic rocks to assess their potential in CO2 trapping . Dunite samples were preparad as dual sets of clastic and block for reaction experiments with two different acid solutions: pH2-pH4. Mineralogical, petrographic, micromorphological and chemical findings from the experimental samples revealed the development of alteration zones covering surfaces of clast and blocks and discontinues dominated by Mg- and Fe-carbonate minerals. The findings indicate that the dunite lithologies of Orhaneli ophiolite may exhibit a high potential for CO2 storage in field scale.

Keywords

• Carbon dioxide storage
• batch reaction experiment
• Orhaneli Ophiolite
• SEM-EDX
• XRD

Orhaneli Ofiyolitinin Karbondioksit Saklama Potansiyelinin Araştırılması: Deneysel Bulgular

Abstract

Çağımızda iklim ve ekoloji krizleri ile mücadele etmek için karbon emisyonlarının azaltılması adına yenilikçi çözümlere ihtiyaç duyulmaktadır. Son 30 yıllık dönemde gerçekleştirilen öncü teorik çalışmalar, atmosfer-litosfer etkileşim süreçlerinin doğal bir sonucu olarak oluşan karbonat minerallerinin, atmosferik karbondioksitin kalıcı bertarafı bakımından büyük potansiyel taşıdığını göstermiştir. Bununla birlikte, atmosferik karbondioksitin jeolojik bertarafını hedefleyen yerel uygulamaların başarıyla gerçekleştirilmesi için, başta karbonatlaşmanın hangi kaya türlerinde ve hangi koşullarda en etkili biçimde gerçekleştirilebileceğine dair yaklaşımlarda bulunmak adına literatürdeki pek çok eksiliğin giderilmesine ihtiyaç vardır. Alp-Himalaya orojenik kuşağında yer alan Türkiye, Tetis okyasnusun kalıntılarını temsil eden ofiyolit ve ofiyolitik yığışım karmaşaları bakımından oldukça zengin bir coğrafyadır. Kuzeybatı Anadolu’da Bursa-Orhaneli civarında geniş alanlarda gözlenen Orhaneli ofiyoliti tipik bir ofiyolit istifinin bazik-ultrabazik litolojilerini oluşturan dünit, harzburjit, klinopiroksenit, gabro ve serpantinlerin yanısıra, değişik boyutlarda kireçtaşı ve şist blokları ile radyolarit ve tüflerden meydana gelir. Mostra ölçeğinde çeşitli ayrışma profilleri ve alterasyon dereceleri sergileyen dünit başlıca olivin + ortopiroksen, magnetit, serpantin, talk, spinel ve kil minerallerinden oluşmaktadır. Bu çalışma kapsamında, Orhaneli ofiyoliti dünitlerinden derlenen numuneler üzerinde kesikli reaktör düzeneğinde, CO2 tutma pontasiyellerinin belirlenmesi amacıyla reaksiyon deneylerine tâbi tutulmuşlardır. Kırıntılı ve blok olarak hazırlanan dünit örneklerinde farklı pH2-pH4 ‘ya sahip asit çözeltileri ilave edilerek bu çözeltilerden karbondioksit gazı geçirilmiştir. Deney örnekleriden yapılan mineralojik, petrografik, mikromorfolojik ve kimyasal analizler, numune yüzeyleri ile mikro süreksizlikler boyunca şiddetli alterasyon zonlarının gelişimi ve bu zonlarda manyezit ve siderit gibi Mg- ve Fe- karbonat minerallerinin kristallendiğini ortaya koymuştur. Elde edilen bulgular, Orhaneli ofiyolitinin mostra ölçeğinde CO2 saklama potansiyelinin olabileceği ortaya koymaktadır.

Keywords

• Karbondioksit saklama
• kesikli reaksiyon deneyi
• Orhaneli Ofiyoliti
• SEM-EDX
• XRD

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