Fig. 1. Geologic map of the Taebaeksan Basin with shown representative high-purity limestone and metal deposits (modified from Koh et al., 2001).
Fig. 2. Slab photographs of the representative carbonate rocks which are indicated the color group and the O-C stable isotopic values. a) dark grey, b) grey, c) light grey, d) white, and e) recrystallized.
Fig. 3. Slab photographs of the representative carbonate rocks showing the different colors in each sample which are indicated the analysed spots (black or white dots) and O-C stable isotopic values.
Fig. 4. Distribution of oxygen-carbon stable isotope ratios of the carbonates in the Daegi Formation from some highpurity limestone deposits (a) and by color (b). It is found that the large variation of the oxygen isotopic values but that the small of the carbon except one sample, calcite vein. There is no difference in the oxygen isotpoic ratios by color. Range of sedimentary and magmatic carbonates are from James and Jones (2016) and Tayler et al. (1967). Magmatic water box: δ13CPDB = -8.0 ~ -5.0 ; δ18OSMOW = 5.5 ~ 10.0 .
Fig. 5. XRD results of the white (a) and dark grey (b)carbonate rocks from the Daegi Formation. cal = calcite,dol = dolomite.
Fig. 6. Distribution of oxygen-carbon stable isotope ratios of the carbonates in the Daegi Formation from some metal deposits.
Fig. 7. Distribution of oxygen-carbon stable isotope ratios of the carbonates in the Daegi Formation from several outcrops.
Fig. 8. Microphotographs of the carbonate rocks from the high-purity limestone deposits by color. a) white, b) light grey, c)grey, and d) dark grey. The carbonate rocks of white and light grey color consist only carbonate mineral (a, b) but, the grey and dark grey samples contain some pelitic material (c, d).
Table 2. Ranges of oxygen-carbon stable isotope ratio by color at some high-purity limestone deposits (included the data from the GMI mine)
Table 3. Values of oxygen-carbon stable isotope ratio of the outcrops in the Daegi Formation
Table 4. Characteristics of the carbonate rocks grouped by oxygen stable isotopic values
Table 1. Values of oxygen-carbon stable isotope ratio of the Daegi Formation at some high-purity limestone deposits