Pritiprabha Behera posted an Question
July 30, 2020 • 03:31 am 30 points
  • IIT JAM
  • Geology (GG)

Plz explain it

plz answer it .. not able to understand it.... and in no 6 how to know which rock description is given

2 Answer(s) Answer Now
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    Rahul kumar Best Answer

    Q5 (Ans-C) Either raising Pressure or Temperature will support melting of Albite+Water. As you can see that the reaction curve has-ve slope (dP/dT is -ve), so by raising either pressure or temperature or raising both pressure and temperature simultaneously will support the forward movement of reaction and will lead melting of Albite+Water. Q6 (Ans-A) Basalt is the given rock because rock showing aphanitic texture (grain sizes are less than 1mm) and dominated by olivine, Pyroxene and plagioclase with glass.

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    Sajan sarthak

    Go through the QAPF diagrams clearly.

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    QAPF diagrams meaning??

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    Quartz alkali plagioclase feldspathiod diagram of igneous rock classification

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    Sajan sarthak best-answer

    It is a basalt as basalt is composed of olivine ,pyroxene and plagioclase and here the glass presence showing its a volcanic rock. so Gabbro and diorite is eleminated as they are plutonic. Rhyolite it is not because rhyolite is sillica rich and olivine is sillica undersaturated/poor so they will not coexist.

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