REE and Sr–Nd Isotope Characteristics of Cambrian–Ordovician Carbonate in Taebaek and Jeongseon Area, Korea

• Main Authors: Tae-Hyeon Kim, Seung-Gu Lee, Jae-Young Yu
• Format: Article
• Language: English
• Published: MDPI AG 2021-03-01
• Series: Minerals
• Subjects: carbonate; REE; Ce anomaly; Sr isotope; Nd isotope; carbonate depositional environment
• Online Access: https://www.mdpi.com/2075-163X/11/3/326

Carbonate formations of the Cambro-Ordovician Period occur in the Taebaek and Jeongseon areas, located in the central–eastern part of the Korean Peninsula. This study analyzed the rare earth element (REE) contents and Sr–Nd isotope ratios in these carbonates to elucidate their depositional environment and diagenetic history. The CI chondrite-normalized REE patterns of the carbonates showed negative Eu anomalies (Eu_N/(Sm_N × Gd_N)^1/2 = 0.50 to 0.81), but no Ce anomaly (Ce/Ce* = Ce_N/(La_N² × Nd_N)^1/3 = 1.01 ± 0.06). The plot of log (Ce/Ce*) against sea water depth indicates that the carbonates were deposited in a shallow-marine environment such as a platform margin. The ⁸⁷Sr/⁸⁶Sr ratios in both Taebaek and Jeongseon carbonates were higher than those in the seawater at the corresponding geological time. The ⁸⁷Sr/⁸⁶Sr ratios and the values of (La/Yb)_N and (La/Sm)_N suggest that the carbonates in the areas experienced diagenetic processes several times. Their ¹⁴³Nd/¹⁴⁴Nd ratios varied from 0.511841 to 0.511980. The low ε_Nd values and high ⁸⁷Sr/⁸⁶Sr ratios in the carbonates may have resulted from the interaction with the hydrothermal fluid derived from the intrusive granite during the Cretaceous Period.