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

Tae-Hyeon Kim,Seung-Gu Lee,Jae-Young Yu

doi:10.3390/min11030326

Tae-Hyeon Kim, Seung-Gu Lee + Show 1 more

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https://doi.org/10.3390/min11030326

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Abstract

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 (EuN/(SmN × GdN)1/2 = 0.50 to 0.81), but no Ce anomaly (Ce/Ce* = CeN/(LaN2 × NdN)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 εNd 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.

Highlights

The rare earth element (REE) patterns of carbonates can help understand their depositional environment and diagenetic processes [1,2,3]
The 87 Sr/86 Sr ratios of carbonates are known to be insignificantly affected by the pore water during early diagenesis, but they can be raised by the interaction with hydrothermal fluid during a later diagenetic process [4,5,6]
Carbonate is mostly deposited in shallow marine environments and, its REE

Summary

Introduction

The rare earth element (REE) patterns of carbonates can help understand their depositional environment and diagenetic processes [1,2,3]. Tanaka et al [1] inferred the seawater depth of carbonate deposition according to the variation of Ce anomalies with the sea water depth. Zhang et al [3] reported that the REE pattern of a carbonate varies according to its tectonic setting. The 87 Sr/86 Sr ratios of carbonates are known to be insignificantly affected by the pore water during early diagenesis, but they can be raised by the interaction with hydrothermal fluid during a later diagenetic process [4,5,6].

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