EARTH232 Study Guide - Final Guide: Partial Melting, Forsterite, Eutectic System
26 Aug 2016
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6 questions (big questions, long answers, 10 marks each, essay, 10 things for each question or more for bonus marks) 1 metamorphic draw simple ternary eutectic system (diopside-anorthite) (y axis is temp, x axis is % Olivine wt% forsterite know which end of the solidus line is the higher/lower temp. Know that fe3+ can"t be put into olivine but in spinels. Cotectic line (eutectic line joined together), peritectic, liquidus, solidus eutectic point is always the lowest temp, peritectic is higher (liquid may or may not be consumed ) From liquidus, draw vertical line straight down and see where it ends up. The line between a+b and b+c melt 1 is at b+c binary system vs ternary system. Explain fractional crystallization describe the continuous and discountinuous reactions. (l1 c + l2) The crystals that form first such as forsterite settle down to the bottom while the melt becomes enriched in fayalite.
