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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Raunak Mitra posted an Question
February 08, 2022 • 21:13 pm
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30 points
30 points
- IIT JAM
- Geology (GG)
49. lava with 225 moles of diopside and 75 moles of anorthite finally crystallizes to form a rock with a composition at the eutectic. find out the moles of an i
49. Lava with 225 moles of Diopside and 75 moles of Anorthite finally crystallizes to form a rock with a composition at the eutectic. Find out the moles of An in the final rock composition.
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Sushmita Best Answer
For initial comp A(75% Di & 25% An) , cools down it falls on liquidus line at 'a', on liquidus line first crystallization of diopside crystallizes at temp less than melting point of diopside upto e eutectic point via continuous reaction. After reaching the eutectic point'e' along with diopside, the first crystal of anorthite also start crystallizing & finally crystallization cases at eutectic point, the final composition of crystal will be same as intial comp. So, moles of An in final rock comp should be 75 moles.