ÇAĞRILI KONUŞMALAR / KEYNOTES Invited Speeches ... - TPJD

Rare Earth Elements (REEs) Enrichments in the Upper Cretaceous Haymana
Formation (Haymana/ANKARA)
Esra Yurdugül 1 , Ali Sarı 2 , Şükrü Koç 2 , Okay Çimen 1 , Alpay Karakuş 1
1 Ankara University, Graduate School of Natural and Applied Scıences, Ankara
2 Ankara University, Faculty of Engineering, Department of Geological Engineering, Ankara
Rare earth elements content of the samples which are collected from the study area were
determined by ICP-MS method. REEs content of various rock litholigies are as follows;
carbonaceous claystone 77.81-167.05 (111.07) ppm, sandstone 99.05-127.49 (110.81) ppm, marl
7.69-84.48 (49.45) ppm. REEs content show a decreasing trend from carbonaceous claystone to
marl samples. Because of increasing of the clay contents, concentration of REEs increase in the all
samples. With increasing of clay content in the examined samples are observed that increasing
of LREE/HREE ratio either. These ratios are as follows ; sandstone samples 4.14, carbonaceous
claystone 3.23 and marl 2.82. This situation indicates that REEs were transported with clay
minerals to depositional environment and clay minerals control the concentrations of the light
rare earth elements. When REEs contents of all the samples normalized to UCC and PASS values,
negative Ce anomalies and positive Eu anomalies were determined. Negative Ce anomalies
indicate oxygen conditions in the depositional environment, whereas the samples which have
got increasing positive Eu anomalies indicate decreasing of energy in the environment and
presence of Ca-bearing minerals.
Keywords: Haymana, Rare earth elements, PAAS, UCC, Clay minerals
185