THE LIQUATION OF TUNGSTEN AND TIN BEARING GRANITIC MELT SUPERSATURATED WITH WATER AT 850 ℃ AND 150 MPa

摘要

The experiments with glasses richening in either 0. 45% W and 0. 50% Sn or 0. 13% W and 0. 16% Sn, remelted from porphyritic biotite granite and biotite-muscovit granite respectively, have been carried out in rapid quenched high-pressure vessel system and incorporated with rotational table-needle determination in a Leitz microscope and EPM-810 electron probe microscope analysis, etc. The results showed that the liquation of the W and Sn-bearing granitic magmas containing fluorine or NaCl is certainly presented; however not all granitic magmas may bring about the liquation, which is mainly controlled by pressure, temperature and composition of the system.