Experimental study on liquid immiscibility of lamprophyre-sulfide melt at high temperature and high pressure and its geo

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 to 1560℃, 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.

作 者： LI Bo HUANG Zhilong ZHU Chengming   作者單位： LI Bo(Land and Mineral Resource Engineering College of Kunming University of Science and Technology, Kunming 650093, China)

HUANG Zhilong(The Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China)

ZHU Chengming(The Research Division of the Earth's Interior Materials and Fluid Interaction Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China) 

刊 名： 中國地球化學學報（英文版）  英文刊名： CHINESE JOURNAL OF GEOCHEMISTRY  年，卷(期)： 2009 28(2)  分類號： P59  關(guān)鍵詞： liquid immiscibility of lamprophyre-sulfide melt   experiment   high temperature and ultra-high pressure  

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