Fluid Inclusions and their Geological Significance of Huajian Gold Deposit, Hebei Province, China

Abstract:

The Huajian gold deposit is located in the metallogenic belt of the northern part of the North China block. This deposit's ore bodies are mainly hosted in metamorphosed Neoarchean and Mesoproterozoic sedimentary rocks, of which Mesozoic volcano-intrusive complexes are closely associated with the Gold mineralization. The FIs of the Huajian deposit are primarily aqueous FIs with minor gas FIs. The pure gas or liquid FIs are very few. The ore-forming fluids were characterised by moderate–low temperature, low salinity and high oxygen fugacity and belonged to an H₂O–NaCl ± CO₂ system. The FIs in quartz veins primarily developed in temperature intervals of 202–380°C, 191–407°C and 170–307°C., corresponding to salinities of 3.85wt.% to 11.23 wt.%, 3.69wt.% to 10.99 wt.% and 2.06wt.% to 17 wt.% NaCl eq.., respectively. The trapping pressures of the FIs from high temperature fluids in the quartz veins are 10-90 MPa, corresponding to depths of 1.0–10 km, assuming a density of the overlying rocks of 0.54 g/cm3–0.98 g/cm3. Multiple stages of phase separation or immiscibility of ore-forming fluid was critical for the formation of the Huajian deposit.

• Periodical: Advanced Materials Research (Volumes 962-965)
• Pages: 277-281
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.962-965.277
• Online since: June 2014
• Authors: Cheng Long Shi, Yang Song*, Jian Zhong Hu
• Keywords: Fluid Inclusion, Geology, Gold Deposit

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