A geochemical and geostatistical approach to the origin of the Çatmakaya (Seydişehir-Türkiye) bauxite deposit [Çatmakaya (Seydişehir - Türkiye) boksit yata?inin kökenine jeoistatistiksel ve joekimyasal bir yaklaşim]
Küçük Resim Yok
Tarih
2006
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
The Çatmakaya bauxite deposit occurs in a karstic depression at the top of the Cenomanian limestone, namely the Katrangedi?i formation, and is overlain by the Senonian limestones of the Do?ankuzu formation. These formations are tectonically overlain by the ophiolitic slices of the Bozkir unit mainly comprising diabase-dolerite, serpentinite, radiolarite, limestone and cherts with tectonic contact emplaced during the Late Eocene-Early Miocene period. In order to determine the possible source rocks of the Çatmakaya bauxite deposit, the samples collected from limestones, ophiolites, bauxite ore and terra-rossas were geochemically and geostatistically analysed. Based on the analysis results of ophiolite samples, the strong positive correlations were found between the Al2O3-CaO pair, different stable elements ratios, and regression line deviation from origin on the stable elements scattering diagram indicate that ophiolites can not be the source rocks of the bauxites. When the fact that the bauxites were derived from limestones is taken into account, an intermediate-products is needed to explain the geochemical behaviour of some elements. In this case, the terra-rossa in the intermediate-product. During the course of the transformation from limestone to terra-rossa, increases in Si and K were 77 - fold the following elements were by multiples of the numbers following them in the list: Zr 60, Ti 50.5, Fe 45.5, Al, Cu, Ga, Nb and Th 37-40, Pb 21, Cr 19.6, Na 14, V 11, Ni 9.3, Mg 7.5 and Zn 2.5 times. While all these elements show increases, Ca decreased 20.1 times. During the transition from terra-rossa to bauxite, and causing the same convention for indicating increases whereas Ca 30.7, Mg 26.5, Na 17.9, Si 11, Zn 13.8, Cu 8.7, K 8.6 and P 7.5 decreased, Al 3.04, Fe 2.14, Ti, Cr Al-Fe and Al-Si in the carbonate rocks and in terra-rossa which derived from them, and the strong negative correlation between Ca-Al, Ca-Si and Ca-Ti indicates that Al, Fe, Si and Ti and Ca have originated from different source. The coeffitic correlation dendograms also support this. However, while stable elements ratios (Al/Ti, Al/Th, AI/Zr, Ti/Zr, Ti/Ga, Ti/Nb, Ti/Th, Ga/Nb, Ga/Th, Ga/Zr, Nb/Th, Nb/Zr, Th/Zr) of carbonate rocks, terra-rosas and bauxites of the Çatmakaya area are similar, those of ophiolitic rocks are different. If the elements of bauxites and probable provenance rocks are evaluated all together, the correlation coefficients of Al-Fe,Al-Ti, Al-Ga, Al-Nb, Al-Th, AI-Zr, Ti-Ga, Ti-Nb, Ti-Th, Ti-V, Ti-Zr, Ga-Nb, Ga-Th, Ga-Zr, Nb-Th, Nb-Zr and Th-Zr element pairs show very high positive (>0.95) correlation. In the scatter diagrams of the elements, regression lines pass through the origin and terra-rossas located between the carbonate rocks and bauxites. Based on these data, it can be stated that the source rock of the Çatmakaya bauxite is terra-rossa which is derived from the nearby carbonated rocks.
Açıklama
Anahtar Kelimeler
Bauxite, Çatmakaya, Geochemistry, Geostatistic, Seydişehir, Terra-rossa
Kaynak
Yerbilimleri/ Earth Sciences
WoS Q Değeri
Scopus Q Değeri
Q4
Cilt
27
Sayı
2
