Experimental study on liquid immiscibility of lamprophyre-sulfide melt at high temperature and high pressure and its geological significance |
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| Authors: | Bo Li Zhilong Huang Chengming Zhu |
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| Institution: | (1) Land and Mineral Resource Engineering College of Kunming University of Science and Technology, Kunming, 650093, China;(2) The Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002, China;(3) The Research Division of the Earth’s Interior Materials and Fluid Interaction Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002, China |
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| Abstract: | With lamprophyre and pyrite from the Laowangzhai gold deposit, Yunnan Province, China, as starting materials, and at pressures
from 1.5 to 3.0 GPa and temperatures from 1160 160 to 1560°C, an experimental study was carried out on the liquid immiscibility
of lamprophyre-sulfide melt at high temperature and ultra-high pressure in the DS-29A cubic 3600T/6-type high pressure apparatus.
Results showed that the liquid immiscibility of lampropyre- sulfide melt in the magmatic system would happen during the early
magmatic evolution (high temperature and high pressure conditions) and was controlled by temperature and pressure. The sulfide
melt which was separated from the lamprophyric melt would make directional movement in the temperature and pressure field
and assemble in the low-temperature and low-pressure region. Because the density of SM is higher than that of the lamprophyric
melt, the former would gather together at the bottom of the magma chamber and there would exist a striking boundary between
the two melts. On the other hand, the results also suggested that there would be little possibility for lamprophyric magma
to carry massive gold, and lamprophyres can’t provide many of ore-forming materials (Au) in the processes of gold mineralization. |
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| Keywords: | liquid immiscibility of lamprophyre-sulfide melt experiment high temperature and ultra-high pressure |
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