Kızıldağ (Hatay) ofiyolitine ait manto peridotitlerinin petrografisi, tüm-kayaç jeokimyası ve erigiyik-kayaç etkileşim izleri

Yıl 2024, Cilt: 14 Sayı: 2, 379 - 393, 15.06.2024

Ahmet Dündar Şen

https://doi.org/10.17714/gumusfenbil.1405095

Öz

Kızıldağ ofiyoliti (G-Türkiye) Neotetis okyanusunun güney kolunda oluşmuş okyanusal litosfer kalıntısı kayaçlar topluluğu olarak bilinmektedir. Ofiyolit istifi tabandan tavana doğru manto peridotitleri, ultramafik-mafik kümülatlar, izotrop gabrolar, levha dayk kompleksi ve yastık şekilli bazaltik örtü kayaçları şeklindedir. Manto peridotitleri harzburjit bileşimindedir ve değişen oranlarda serpantinleşme gözlenmektedir. Manto peridotitlerinin tüm kayaç ana oksit-iz element ve Lantanit Grubu Element (LGE) içerikleri harzburjitlerin değişen derecelerde kısmi ergime kalıntısı kayaçlar olduğuna işaret etmektedir. Harzburjitler düşük tüm-kayaç Al ve Ca kompozisyonlarına sahiptir ve SSZ peridotitlerin tüketilmiş karakterini yansıtmaktadır. Tüketilmiş manto harzburjitleri, bazı büyük iyon yarıçaplı elementler (LILE) ve hafif lantanit grubu elementler (HLGE) bakımından zenginleşme gösterdiği tespit edilmiştir ve bu durum yitim sırasında meydana gelen ergiyik manto etkileşimine işaret etmektedir. Harzburjitlerin tüm kayaç MgO içerikleri ile CaO ve Al2O3 içerikleri kıyaslandığında bu kayaçların %20-30 arası kısmi ergime kalıntısı kayaçlar olduğu görülmektedir. Ayrıca kısmi ergime sırasında uyumsuz davrandığı bilinen Ti ve Yb içeriklerindeki zenginleşmeler ergiyik-kayaç etkileşimine işaret etmektedir.

Anahtar Kelimeler

Ergiyik-kayaç etkileşimi, Harzburjit, Kızıldağ ofiyoliti

Whole-rock and petrological properties of mantle peridotites from Kızıldağ (Hatay) ophiolite, tracing melt-rock interaction process

Öz

Kızıldağ ophiolite (G-Turkey) is known as oceanic lithosphere remnant rocks formed in the southern arm of the Neotethys ocean. The ophiolite sequence, from bottom to top, mantle peridotites, ultramafic-mafic cumulates, isotropic gabbros, sheet dyke complex and pillow-shaped basaltic cover rocks. Mantle peridotites are in harzburgite composition and varying degrees of serpentinization are observed. Whole-rock major oxide-trace element Lanthanide Group Element (LGE) contents of mantle peridotites indicate that harzburgites are residues after partially molten layers of upper mantle. Harzburgites have low whole-rock Al and Ca compositions and reflect the depleted character of SSZ peridotites. Depleted mantle harzburgites have been found to be enriched in some large ionic radius elements (LILE) and light rare earth elements (LREE), indicating the melt-mantle interaction occurring during subduction. When whole rock MgO contents and CaO and Al2O3 contents of harzburgites are compared, it is seen that these rocks are partial melt residue rocks of 20-30% additionally Ti and Yb contents, which are known to behave incompatibly during partial melting, indicate melt-rock interaction.

Anahtar Kelimeler

Melt-rock interaction, harzburgite, Kızıldağ ophiolite

Kaynakça

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