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 |
Lee |