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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Raunak Mitra posted an Question
June 14, 2020 • 00:25 am
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30 points
30 points
- IIT JAM
- Geology (GG)
What is the significance of triple point in p-t diagram of alluminosilicate?
What is the significance of triple point in P-T diagram of Alluminosilicate?
2 Answer(s)
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Sajan sarthak Best Answer
1.Triple point in aluminosillcate that is (Al2SiO5) signifies existing of all the three phases at that point means at that pressure and temperature three phases can coexist i.e kyanite,andalusite,sillimanite. 2. FROM PHASE RULE ,(P+F= C+2) Phase(P) =kyanite,andalusite, sillimanite (3) Component(C)= 1(only Al2SiO5) so 3+F=1+2 F(degree of freedom)=0 so at that point it is invariant . 3: In thin sections of a metamorphic rock if all three minerals are present side by side we can exactly predict that at triple point temperature all this event has occurred. triple point temperature and pressure is fixed as we can't change any variable as it has occurred at invariant point.
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Rahul kumar![best-answer]()
Andalusite, kyanite, and sillimanite are all naturally occurring aluminosilicate minerals that have the composition Al2SiO5 . The triple point of these three polymorphs is located at a temperature of 500 °C and a pressure of 0.4 GPa. These three minerals are commonly used as index minerals in metamorphic rocks. Each of these minerals occurs under different temperature-pressure regimes, and they are therefore rarely found together in the same rock. Because of this, the three minerals are a useful tool in identifying the pressure-temperature paths of the host rock in which they are found. At triple points, all of three phases of aluminosilicate can occur together in equilibrium.