Now let\'s explore several different compositions on a binary peritectic system.
ID: 701603 • Letter: N
Question
Now let's explore several different compositions on a binary peritectic system. 1. A liquid with a composition of Qzss begins to cool. Describe the sequence of events that occur as it crystallizes. 2. A liquid with a composition of Qz2o begins to cool. a. What is the first crystal to form? At what temperature? b. Describe what happens at a temperature of 1557-C. There is a reaction that occurs at 1557"C. When does this reaction finish? What is the final mineralogy of the rock? c. d. Draw the complete path that the liquid follows as this system cools 2100 2000 Liquid 1890 2 Liquids 1800 1695 1713 Cr+L 1600 1557 1543 EntL Cr+ En 1500 Fo +En 1400 Tr +En FoExplanation / Answer
1) As can be interpreted from Plot,
-During cooling, At T=2000 degC, mixed solution of En and Qz will develop. This solution will remain as we cool to 1695 degC
-At 1695 deg C, Three Phases will devleop. One Phase will content En and Qz in propotionate quanttiy. Another layer contains Qz will little bit En. Last layer will have crystals developed in liquid solution
2) Interpreting the Plot,
a) First crystals will form at ~1800 degC where L phase turns into Fo+L phase where Fo is the crystal
b) At 1557 deg C, Peritectic reaction will start and L starts converting to En
c) As can be seen, at around 20-30 degree below 1557, whole L will be converted into En then reaction will stop
d)
-First, whole Qz will be in liquid phase
-At ~1800 C, Fo crystals will develoop in liquid
-At 1557 degree C, equilibrium will exist among three phases. One phase consisting of Fo crystals in liquid, Second phase of En & L solution (Fo & L reacts to produce En) and third phase of Fo in En
-Cooling more than ~30 deg C below 1557 will have phase consists of Fo crystals in En
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