Chemistry Reference
In-Depth Information
v Heterogeneous fluids are much more complicated to analyze, better
make any conclusion without additional data. They may result from
perturbation (leakage), successive fluid pulses or, again a result that
only inclusion can provide, fluid immiscibility. Be careful, not to jump
immediately to this tempting conclusions: I have seen a number of «boil-
ing» examples (liquid/vapour immiscibility) simply due to liquid H
2
O
leakage.
vi Highly complicated (but also very important) to be evidenced for flu-
ids, immiscibility is far more simple - but equally important - for melt
inclusions. These require for their proper investigation special equip-
ment (high-temperature heating microscopic stages), only to be found
in a small number of highly specialized lab. But the two basic type of
melt immiscibility (melt/melt or melt/fluid) are easily identified under
the microscope, always from the same criteria (droplet of A within B,
see illustrations). The fact that it is possible to bring the glass inclu-
sion at the thin section surface for microporbe analysis is an additional
advantage. But, again do not believe that a complete interpretation is
easy work. If you observe these phenomena in your samples, they are
indeed interesting rocks. But if you see them for the first time better
show them to a specialist!
