Experimental study of the physico-chemical conditions of skarn formation |
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| Authors: | Bin Zhao Tongjin Li Zhaopin Li |
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| Institution: | 1. Institute of Geochemistry, Academia Sinica, China
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| Abstract: | Experimental results show that skarns can—800°C and 500–1,000 bars. Starting materials include intermediate-acidic igneous rocks, volcanic rocks, metamorphic rocks, carbonates of various purities and chemical reagents of analytical purity-grade. Experimental media are: NaCl, NaCl+CaCl2, NaCl+CaCl2+MgCl2, Na2CO3 and Na2SiO3 solutions. Experimental results show that skarns can be formed under wide physico-chemical conditions:T=400°–800°C,P=500–1,000 bars,pH=4–11, and \(f_{O_2 } = 10^{ - 23} - 10^{ - 11} \) bar. The mineralogy of skarns and the chemical compositions of skarn minerals are generally controlled by the combined factors: the chemical composition of the original rocks, pH values, redox conditions, temperatures and pressures. Isomorphous substitution may have agreat effect on the temperature of formation andfo 2 of some major skarn minerals. It is found that skarnization occurs preferentially in NaCl and NaCl+CaCl2 solutions and subortinately in MaCO3 and Na2SiO3 soiutions. |
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