Economic and Environmental Geology

Table. 6.

Table. 6.

Comparison of deposit characteristics between the Dashiqiao and Dancheon magnesite deposits

Dashiqiao (China) Dancheon (North Korea)
Host rock • dolostone • dolostone
Formation • Dashiqiao Formation (Proterozoic) • Bukdaecheon Series (Proterozoic)
Orebody • white, gray, pinkish color
• sparry texture
• residual dolomite
• talc-chlorite vein
• dolomite, calcite vein
• pinkish, white, gray color
• sparry texture
• residual dolomite
• talc-chlorite vein
Minerals • major magnesite, talc
• minor chlorite, apatite, quartz
• major magnesite
• minor talc, chlorite, apatite, quartz, tremolite
Chlorite composition • clinochlore, penninite, talc-chlorite • mostly clinochlore
Homogenization temperature and salinity • 121~250 ℃ (avg. 175 ℃)
• 1.7~22.4 wt% NaCl (avg. 10.2 wt% NaCl)
• 112~272 ℃ (avg. 187 ℃)
• 0.5~34.1 wt% NaCl (avg. 14.5 wt% NaCl)
Chlorite geothermometer • 137~293 ℃ (avg. 228 ℃) • 159~307 ℃ (avg. 212 ℃)
Pressure • < 3.16 kb • < 3.62 kb
Oxygen-carbon isotope • δ18O: magnesite (9.2~16.9 ‰), dolomite (16.4~19.5 ‰)
• δ13C: magnesite (-1.3~0.9 ‰), dolomiticmarble (0.6~1.4 ‰)
• δ18O: magnesite (8.7~11.4 ‰), dolomite (19.0~23.0 ‰)
• δ13C: magnesite (0.1~0.8 ‰), dolomite (-0.95~1.0 ‰)
References This study, Tang et al. (2013) Lee et al. (2021)
Econ. Environ. Geol. 2021;54:767-85 https://doi.org/10.9719/EEG.2021.54.6.767
© 2021 Econ. Environ. Geol.