Numerical simulation of hydrothermal mineralization associated with simplified chemical reactions in Kaerqueka polymetallic deposit, Qinghai, China
(1. Computational Geosciences Research Center, Central South University, Changsha 410083, China;
2. Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring,
Ministry of Education, School of Geosciences and Info-Physics, Central South University, Changsha 410083, China;
3. Embedded and Networking Computing Laboratory, Hunan University, Changsha 410082, China;
4. College of Resources Environment and Tourism, College of Hunan Arts and Science, Changde 415000, China;
5. Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, China)
2. Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring,
Ministry of Education, School of Geosciences and Info-Physics, Central South University, Changsha 410083, China;
3. Embedded and Networking Computing Laboratory, Hunan University, Changsha 410082, China;
4. College of Resources Environment and Tourism, College of Hunan Arts and Science, Changde 415000, China;
5. Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, China)
Abstract: The Kaerqueka polymetallic deposit, Qinghai, China, is one of the typical skarn-type polymetallic ore deposits in the Qimantage metallogenic belt. The dynamic mechanism on the formation of the Kaerqueka polymetallic deposit is always an interesting topic of research. We used the finite difference method to model the mineralizing process of the chalcopyrite in this region with considering the field geological features, mineralogy and geochemistry. In particular, the modern mineralization theory was used to quantitatively estimate the related chemical reactions associated with the chalcopyrite formation in the Kaerqueka polymetallic deposit. The numerical results indicate that the hydrothermal fluid flow is a key controlling factor of mineralization in this area and the temperature gradient is the driving force of pore-fluid flow. The metallogenic temperature of chalcopyrite in the Kaerqueka polymetallic deposit is between 250 and 350 °C. The corresponding computational results have been verified by the field observations. It has been further demonstrated that the simulation results of coupled models in the field of emerging computational geosciences can enhance our understanding of the ore-forming processes in this area.
Key words: numerical simulation; heat transfer; chemical reaction; hydrothermal mineralization; Kaerqueka polymetallic deposit