Öz: Türkiye`de Neotetis Okyanusu`nun kuzey kolunun kalıntısı olan İzmir-Ankara-Erzincan kenet zonunun(İAESZ) ofiyolitik melanj kompleksleri birçok manganez oksit yataklarına ev sahipliği yapmaktadır. Bu yataklar, melanj ünitelerine ait olan kırmızı-menekşe renkli radyolaryalı çört blokları içerisinde gözlenmektedir. Bu melanj birliklerinden, Artova melanjı Kırşehir Masifi (Orta Türkiye)`nin kuzey kesiminde İAESZ boyunca yayılım sunmaktadır ve aynı zamanda altere serpantinit ve radyolaryalı çört blokları, yastık lav, pelajik kireçtaşı bloklarından meydana gelmektedir. Cihanpaşa (Yozgat, İç Anadolu) bölgesinden Mn-oksit cevherleşmeleri, bu oluşumların kökeni, paleoredoks özellikleri ve depolanma ortamlarını ortaya koymak için analiz edilmiştir. Cevherleşmelerinin mineral parajenezi yaygın olarak braunit, pirolusit, psilomelan ve kuvars minerallerinden oluşmaktadır. Jeokimyasalolarak, yüksek Mn/Fe (60,2), düşük ΣNYE (15,75 ppm), Cu+Ni+Co (730 ppm), negatif Ce anomalisi ve hafif negatifY/Y* anomalisi (0,87) Cihanpaşa manganez cevherleşmelerinin denizaltı bir hidrotermal sistem ile oluştuğunu ortaya koymaktadır. Negatif Ce/Ce* anomalisi (0,33), düşük Ceanom değerleri (< -0,54), redoks göstergeler [V/(V+ Ni) = 0,43; Ni/Co = 0,51, V/Mo = 6,15)] çalışılan manganez cevherleşmelerinin hidrotermal sistem tarafından oksijenli bir sedimanter ortamda oluştuğuna işaret etmektedir. Dahası, hafif pozitif ve negatif Eu anomalisi (0,84),yüksek Lasn/Cesn (3,96), düşük Al/(Al + Fe) (0,34) ve ΣNYE/Fe (30,7x10-4) oranları Cihanpaşa manganez oksit cevherleşmelerinin Neotetis Okyanusunun yaklaşık yayılma sırtına nispeten yakın düşük sıcaklıklı hidrotermal sistemin etkisi ile şekillenmiş olduğunu göstermektedir.
Cihanpaşa
Hidrotermal
İç Anadolu
manganez oksit cevherleşmesi
radyolaryalı çört
Yozgat
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