Iron mineralizations in the study area are found in amphibolites in the localities of Buyukoren,Uzunkuyu-Atkayasi,and Karabacak and they display a predominantly banded texture.Their paragenesis is dominated by magneti...Iron mineralizations in the study area are found in amphibolites in the localities of Buyukoren,Uzunkuyu-Atkayasi,and Karabacak and they display a predominantly banded texture.Their paragenesis is dominated by magnetite and hematite.In this study,iron mineralizations in Sarikaya were examined in terms of rare earth element(REE) contents and attempts were made to determine some physicochemical conditions that had an impact upon their formation.For this purpose,42 ore samples and 17 enriched magnetite samples...展开更多
The Lower Eocene Celtek Formation is located in the Sorgun district of thecity of Yozgat in Turkey.In the study area,Paleozoic,Campanian-Maastrichtian,Eocene,Miocene and Quaternary units are exposed.The Celtek Formati...The Lower Eocene Celtek Formation is located in the Sorgun district of thecity of Yozgat in Turkey.In the study area,Paleozoic,Campanian-Maastrichtian,Eocene,Miocene and Quaternary units are exposed.The Celtek Formation is noteworthy with its coal and oil shale deposits.Samples were collected from one exposure(YCOSK)and two boreholes(SJ and C boreholes)at the facility operated by the Yeni Celtek Coal Management.Concentrations of REE in oil shales from these localities were determined using the ICP-MS technique.REE and total organic carbon(TOC)values of a total of 32 samples were compared with normalized REE contents of various environments.TOC contents of the samples ranged from 1.37wt%to 11.8wt%(mean 4.96wt%).The averages of all samples for the all normalized values show similar patterns.Normalized REE patterns are represented by the enrichment in the order of LREE>MREE>HREE and display negative Ce and positive Eu anomalies.ΣREE vs.TOC were compared.ΣREE vs.TOC showed a weak positive correlation,whereasΣLREE vs.(M+HREE)andΣLREE vs.ΣREE were positively correlated.Regarding tectonic provenance characteristics,the Celtek Formation oil shales were formed in microenvironments with physicochemical conditions changing in character from oxic to euxinic,representing a transitional terrestrial–marine environment.展开更多
The Eymir（Yozgat-Sorgun,Turkey） manganese deposit occurs within radiolarite cherts of the lower Cretaceous ophiolite complex.The mineralization was observed banded and lenticular forms.The geochemical characteristic...The Eymir（Yozgat-Sorgun,Turkey） manganese deposit occurs within radiolarite cherts of the lower Cretaceous ophiolite complex.The mineralization was observed banded and lenticular forms.The geochemical characteristics of the Eymir deposit was studied by means of major oxide,trace and rare earth element（REE） contents and the origin of mineralization was discussed.The correlation coefficients indicated the presence of strong positive relations between major oxides and various trace elements（Al2O3-Fe2O3：r=0.75;Al2O3-CaO：r=0.79;Al2O3-TiO2：r=0.80;Al2O3-Zr：r=0.66;TiO2-Fe2O3：r=0.98;TiO2-CaO：r=0.82;TiO2-Zr：r=0.85 and Fe2O3-Zr：r=0.89） and the contribution of mafic terrigenous material to the deposition.In chondrite normalized REE graphics samples were characterized by highly negative and positive Ce anomalies.Europium showed negative anomaly in all samples.The negative Ce anomaly was typical to submarine hydrothermal deposits and positive Ce anomaly was indicative of hydrogenous deposits.The negative Eu anomaly showed contamination from the continental crust and/or sediment contribution via dehydration.Ce values in the Eymir mineralization were computed from the equation of Ceanom=lg [3xCeN/（2xLaN＋NdN）] and anomalies were found as Ceanom-0.1 in 8 samples and Ceanom-0.1 in 12 samples.These values are indicative of both oxic and anoxic sedimentation conditions.The available data indicated that the Eymir manganese deposit is a hydrothermal-hydrogenous type volcanosedimentary mineralization.展开更多
基金supported by Erciyes University,Directorate of Research Fund (FUBAP-FBT-04-36)
文摘Iron mineralizations in the study area are found in amphibolites in the localities of Buyukoren,Uzunkuyu-Atkayasi,and Karabacak and they display a predominantly banded texture.Their paragenesis is dominated by magnetite and hematite.In this study,iron mineralizations in Sarikaya were examined in terms of rare earth element(REE) contents and attempts were made to determine some physicochemical conditions that had an impact upon their formation.For this purpose,42 ore samples and 17 enriched magnetite samples...
基金financially supported by the Bozok University Project Coordination and Research Center (Scientific Research Projects Commission) (grant No. 2015 MMF/180)
文摘The Lower Eocene Celtek Formation is located in the Sorgun district of thecity of Yozgat in Turkey.In the study area,Paleozoic,Campanian-Maastrichtian,Eocene,Miocene and Quaternary units are exposed.The Celtek Formation is noteworthy with its coal and oil shale deposits.Samples were collected from one exposure(YCOSK)and two boreholes(SJ and C boreholes)at the facility operated by the Yeni Celtek Coal Management.Concentrations of REE in oil shales from these localities were determined using the ICP-MS technique.REE and total organic carbon(TOC)values of a total of 32 samples were compared with normalized REE contents of various environments.TOC contents of the samples ranged from 1.37wt%to 11.8wt%(mean 4.96wt%).The averages of all samples for the all normalized values show similar patterns.Normalized REE patterns are represented by the enrichment in the order of LREE>MREE>HREE and display negative Ce and positive Eu anomalies.ΣREE vs.TOC were compared.ΣREE vs.TOC showed a weak positive correlation,whereasΣLREE vs.(M+HREE)andΣLREE vs.ΣREE were positively correlated.Regarding tectonic provenance characteristics,the Celtek Formation oil shales were formed in microenvironments with physicochemical conditions changing in character from oxic to euxinic,representing a transitional terrestrial–marine environment.
基金supported by Bozok University,Directorate of Research Fund(B.F.F.M/2009-06)the Scientific and Technical Research Council of Turkey(TUBITAK ProjectNo.109Y167)
文摘The Eymir（Yozgat-Sorgun,Turkey） manganese deposit occurs within radiolarite cherts of the lower Cretaceous ophiolite complex.The mineralization was observed banded and lenticular forms.The geochemical characteristics of the Eymir deposit was studied by means of major oxide,trace and rare earth element（REE） contents and the origin of mineralization was discussed.The correlation coefficients indicated the presence of strong positive relations between major oxides and various trace elements（Al2O3-Fe2O3：r=0.75;Al2O3-CaO：r=0.79;Al2O3-TiO2：r=0.80;Al2O3-Zr：r=0.66;TiO2-Fe2O3：r=0.98;TiO2-CaO：r=0.82;TiO2-Zr：r=0.85 and Fe2O3-Zr：r=0.89） and the contribution of mafic terrigenous material to the deposition.In chondrite normalized REE graphics samples were characterized by highly negative and positive Ce anomalies.Europium showed negative anomaly in all samples.The negative Ce anomaly was typical to submarine hydrothermal deposits and positive Ce anomaly was indicative of hydrogenous deposits.The negative Eu anomaly showed contamination from the continental crust and/or sediment contribution via dehydration.Ce values in the Eymir mineralization were computed from the equation of Ceanom=lg [3xCeN/（2xLaN＋NdN）] and anomalies were found as Ceanom-0.1 in 8 samples and Ceanom-0.1 in 12 samples.These values are indicative of both oxic and anoxic sedimentation conditions.The available data indicated that the Eymir manganese deposit is a hydrothermal-hydrogenous type volcanosedimentary mineralization.
