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  • Turkish Journal of Earth Sciences
  • Volume:13 Issue:3
  • Magma Interaction Recorded in Plagioclase Zoning in Granitoid Systems, Zigana Granitoid, Eastern Pon...

Magma Interaction Recorded in Plagioclase Zoning in Granitoid Systems, Zigana Granitoid, Eastern Pontides, Turkey

Authors : ORHAN KARSLI, FARUK AYDIN M BURHAN SADIKLAR
Pages : 287-306
View : 23 | Download : 14
Publication Date : 0000-00-00
Article Type : Research Paper
Abstract :Bileflimsel zonlanma ile karakterize olan plajiyoklaz kristalleri Zigana Granitoyidi’nde insert ignore into journalissuearticles values(ZG);, KD-Türkiye tipik olarak gözlenmektedir. Kuvars + plajiyoklaz + K-feldspat + hornblend + biyotit + piroksen + magnetit + ilmenit denge kristaleflmesi sunan zonlu plajiyoklaz kristalleri sal›n›ml› insert ignore into journalissuearticles values(oscillatory); zonlanma gösterirler. Kristal boylar› 3 ile 6 mm aras›nda de¤iflen zonlu plajiyoklaz kristalleri çoklukla oval biçimli olup, normal lata biçimlilerden daha büyüktürler. Zonlu plajiyoklazlar petrografik olarak, tamamen zonlu ve merkezi süngerimsi kenar› zonlu kristaller olmak üzere iki ana grupta toplanm›fllard›r. Zonlu kristallerin bileflimleri An23 insert ignore into journalissuearticles values(oligoklaz); ile An70 insert ignore into journalissuearticles values(labradorit); aras›ndad›r. Sal›n›ml› zonlu plajiyoklaz kristalleri kuvvetli Ca2+ ⇔ Na+, Al3+ ⇔ Si4+ ve zay›f Fe3+ ⇔ Si4+ sübsitüsyon mekanizmas› ile kontrol edilirler. Plajiyoklazlar›n Fe2O3 top insert ignore into journalissuearticles values(% a¤.); konsantrasyonu, An içeri¤i ile art›fl sunar. Zonlu kristallerin petrografik, kenardan kenara kimyasal de¤iflimleri ve mol % An içerikleri ile Fe2O3 top konsantrasyonlar› aras›ndaki pozitif iliflki, Zigana Granitoyidi’nin insert ignore into journalissuearticles values(ZG); oluflumu s›ras›nda felsik magma odas›na sürekli bir mafik injeksiyonun varl›¤›na ve dolay›s›yla magma etkilefliminin a¤›rl›kl› magmatik olay olabilece¤ini yans›tmaktad›r.
Keywords : plagioclase, oscillatory zoning, mafic felsic magma interaction, Zigana Granitoid, eastern Pontides, Turkey

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