The REE Characteristics of Oil Shales in the Lower Eocene Celtek Formation (Yozgat,Turkey) and their Relation to Tectonic Provenance
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摘要
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(YC ?SK) and two boreholes(SJ and ? 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 1.37 wt% to 11.8 wt%(mean 4.96 wt%). 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) and ΣLREE 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.
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(YC ?SK) and two boreholes(SJ and ? 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 1.37 wt% to 11.8 wt%(mean 4.96 wt%). 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) and ΣLREE 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.
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(YC ?SK) and two boreholes(SJ and ? 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 1.37 wt% to 11.8 wt%(mean 4.96 wt%). 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) and ΣLREE 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.
引文
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