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Factors Controlling Low Uranium and Thorium Concentrations in the Cayirhan Bituminous Shales(CBS)in the Beypazari(Ankara)Area,Turkey

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Acta Geologica Sinica(English Edition) 2014年第1期88卷 248-252,I0009,I0010,253-259页

作者： berna yavuz pehlivanli Sükrü KOC Ali SARI Hilal ENGIN Department of Geological Engineering Faculty of Engineering and Architecture Bozok University Department of Geological Engineering Faculty of Engineernig Ankara University Graduate School of Natural and Applied Sciences Ankara University

In this study uranium and thorium contents and depositional characteristics of ay rhan bituminous shales（ BS）, west of Ankara（central Anatolia）, are investigated. Samples used were collected from boreholes opened by Park Holding Ltd. A total of 25 samples were taken from bituminous shale levels in boreholes drilled at 6 different locations in the study area. The H rka formation which hosts bituminous shale deposits is a volcanosedimentary sequence and all lithofacies indicate that a lacustrine environment where the water level was continuously changed. In addition to hydrocarbon generation potential, bituminous shales also accumulate significant amount of radioactive elements such as uranium and thorium. The average uranium and thorium concentrations of BS（1.83/2.62 ppm） are much lower than averages of UC, NASK and PAAS（uranium： 2.70/2.66/3.10 ppm; thorium： 8.50/12.30/14.60 ppm）. Low uranium contents in comparison to those of similar lacustrine environments might be attributed to that waters of depositional environment of BS contain low concentration of dissolved uranium and redox conditions were of oxic and dioxic character. Correlation data indicate that U and Th have a similar source and are associated predominantly with clays and phosphates and dominantly with organic material. Radioactive elements in the basin might be derived from Paleozoic granites and metamorphites（e.g. gneiss, schist） which comprise the basement and volcanism which was active in the region throughout the Miocene period. These elements are probably associated with uraniferous phosphate minerals（e.g. autunite, torbernite） which occur in granite, gneiss and schist. BS with average TOC content of 10.96 % shows very good/perfect source rock potential. Positive correlations between Gamma-Ray values and U, Th and K concentrations imply that radioactivity might be originated from these three elements.

关键词： Uranium and Thorium concentrations ay rhan bituminous shales Beypazar area Turkey

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The REE Characteristics of Oil Shales in the Lower Eocene Celtek Formation (Yozgat,Turkey) and their Relation to Tectonic Provenance

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Acta Geologica Sinica(English Edition) 2019年第3期93卷 604-621页

作者： yavuz pehlivanli berna Department of Geological Engineering Bozok University

The Lower Eocene Celtek Formation is located in the Sorgun district of thecity of Yozgat in *** the study area,Paleozoic,Campanian-Maastrichtian,Eocene,Miocene and Quaternary units are *** Celtek Formation is noteworthy with its coal and oil shale *** were collected from one exposure(YCOSK)and two boreholes(SJ and C boreholes)at the facility operated by the Yeni Celtek Coal *** of REE in oil shales from these localities were determined using the ICP-MS *** and total organic carbon(TOC)values of a total of 32 samples were compared with normalized REE contents of various *** 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 *** REE patterns are represented by the enrichment in the order of LREE>MREE>HREE and display negative Ce and positive Eu anomalies.ΣREE *** were compared.ΣREE *** showed a weak positive correlation,whereasΣLREE vs.(M+HREE)andΣLREE vs.ΣREE were positively *** 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.

关键词： rare earth element geochemistry Ce anomaly Eu anomaly tectonic provenance Celtek Formation oil shale Sorgun(Yozgat) Turkey

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