Shivam sharma Asked a Question
August 31, 2020 5:46 pmpts 30 pts
Fig. 1 and Fig. 2 given below represent schematic phase relations in two binary systems at identical and constant pressure. A and B have eutectic relationship while C and D form a solid solution. The temperature scale (Y-axis) is same in both figures. R1, R2, R3 and R4 represent four rock compositions in these two systems. Write the sequence in which melts will start forming in these rocks (RI, R2, R3 and R4) with increasing temperature (without changing pressure). Explain with justification, the order in which the solid component will completely melt (under equilibrium condition) in R1, R2, R3 and R4 as heating proceeds. Liquid Liquid A R1 R2 B C R3 R4 D Fig. Fig. 2
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  • Rahul pandey Best Answer
    R1: Since R1 is a part of eutectic system, the first melt will be of eutectic composition (mixture of A and B) at eutectic temperature. As soon as composition B will be over in roc...
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    Shivam sharma
    So the sequence in which melt form is R1 then R2 and so on ?
  • Sajan sarthak sahoo thankyou
    see attached file
    • cropped811804381580044438.jpg
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    Shivam sharma
    So sequence is R1 then R2 ....... ?
  • Rahul pandey
    Yes, R1, R2.... are rock compositions and with increasing temperature the sequence of melt composition is written in the answer that I have already sent.
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