地質温度計としての液体包有物に関する研究 (第2報)

充填温度法について

抄録

In this paper we dealt with the fundamental problems concerning the heating-stage method of fluid inclusions. When we observe fluid inclusions on the ordinary type of heating-stage, it is often shown that the fluids of inclusions leak out below the filling temperature. The leakage may be attributed to the presence of latent cracks, the strength of enclosing crystal, the differences of forming conditions of each inclusion and the dynamic interactions of inclusions. Therefore it seems that these phenomena cannot be disregarded and should be prevented as for as possible in the heating-stage method.
To avoid these phenomena, “compressing-heating stage”, by which we were able to observe the fluid inclusions in thecondition of saturated water vapour pressure, was made as a trial. Even in the case of a brittle mineral such as anhydrite, which decrepitates and leaks out thefluids of inclusions at various temperatures below the filling temperature in process of heating, we were able to observe the fluid inclusions without the leakage and decrepitation before the filling with the above mentioned equipment.
In the case of the quartz crystals synthesized hydrothermally, the filling temperature coincides approximately with the probable temperature estimated from the growth conditions. It appears that the method of filling temperature analysis of quartz crystal is usefull as the geothermometer. From the view point of the growth conditions and the distribution of inclusions in the synthesized quartz, the dispersion of the measured filling temperatures may be caused by a dense or sparse distribution of inclusions in plane or space and gas pressures in inclusions.