关键词: 太原组, 稀土元素特征, 沉积环境, 潘二煤矿

Abstract: Based on a detailed petrologic study, the characteristics of REEs in limestone samples from the Late Carboniferous Epoch Taiyuan Formation in the Huainan Paner coalmine were analyzed. The origin of REEs and the depositional environment of limestone were investigated. Lower concentrations of Zr, Th, Sc, and relatively higher ratios of Y/Ho show that the limestone sediments deposited in a marine environment, with no impact on terrigenous detrital. The characteristics of LREE-depletion, slightly positive La anomaly, positive Y anomaly and high ratio of Y/Ho show that the limestones have similar tendency as the marine carbonate, which indicates that the limestone deposited in a marine environment. However, the Ce anomaly in the limestone samples reflects a transition process of a reducing-oxidizing environment during the deposition. The positive Eu anomaly reflects that the limestone from Taiyuan Formation was formed in a near coastal environment with the input of weathered terrestrial organic matter.

Key words: Taiyuan Formation, REE characteristics, depositional environment, Paner coalmine