Geofluids

Research Article

Origin and Evolution of the Ore-Forming Fluids in the Liyuan Gold Deposit, Central North China Craton: Constraints from Fluid Inclusions and H-O-C Isotopic Compositions

Table 1

Summary of the microthermometric data from fluid inclusions trapped in quartz and calcite from the three mineralization stages of the Liyuan gold deposit.
StageTypeMineralNumberSize
(μm)		 
°C		 
°C		 
°C		 
°C		 
°C		Salinity
wt.% NaCl equivalent		CO2 density
g/cm3		Bulk density
g/cm3		References
EarlyCQuartz365 to 15−58.3 to −56.818.6–29.5 (L) 318–392 (L/V)2.2 to 8.20.62–0.790.71–0.96This study
WQuartz235 to 12   −5.8 to −1.2320–408 (L)2.1 to 8.9 0.56–0.76This study
PCQuartz134 to 10−58.1 to −56.9 19.8–30.2 (L)   0.59–0.78 This study
MiddleCQuartz385 to 25−60.3 to −56.93.1–9.618.7–30.8 (L) 229 to 327 (L/V)0.8 to 11.80.54–0.780.70–0.95This study
CQuartz693 to 23−60.8 to −57.95.8–6.326.7–30.9 (L) 210 to 350 (L/V)3.3 to 7.70.55–0.680.65–0.98[26]
WQuartz613 to 14   −8.6 to −0.3201 to 329 (L)0.5 to 12.4 0.75–0.95This study
WQuartz1493 to 13   −8.8 to −1.1164 to 344 (L)1.8 to 12.6 0.67–0.96[26]
PCQuartz234 to 8−59.3 to −56.9 17.1–28.7 (L)   0.64–0.80 This study
PCQuartz204 to 11−59.9 to −58.1 21.2–30.2 (L)   0.59–0.76 [26]
LateWQuartz414 to 12   −3.9 to −0.2136 to 227 (L)0.4 to 6.3 0.85–0.96This study
WQuartz142 to 12   −0.7 to −6.3142 to 276 (L)1.2 to 9.6 0.80–0.98[26]
WCalcite202 to 8   −3.6 to −0.3137 to 229 (L)0.5 to 5.9 0.88–0.93This study
C-type, aqueous-carbonic fluid inclusions; PC-type, pure carbonic fluid inclusions; W-type, aqueous fluid inclusions; , melting temperature of solid CO2; , temperature of CO2-clathrate dissociation; , homogenization temperature of CO2; , ice-melting temperature; , total homogenization temperature; L and V stand for liquid and vapuor to which the fluid inclusions homogenize, respectively. The density of CO2 and bulk inclusions are estimated using the Flincor program [32] and the formula of Bowers and Helgeson [33] for the H2O-CO2-NaCl system.