The Olivine-Orthopyroxene-Clinopyroxene (A-B-C) ternary diagram is used to class

Question

The Olivine-Orthopyroxene-Clinopyroxene (A-B-C) ternary diagram is used to classify ultramafic rocks (i.e., peridotites and pyroxenites). Plot the lithologic fields defined below on the second ternary diagram attached to this exercise. Then, plot the five samples on the diagram (labeled with their corresponding #) and determine their lithology. Ol >90% = Dunite; Opx >90% = Orthopyroxenite; Cpx >90% = Clinopyroxenite 90% > Ol > 40%, Cpx < 5% = Harzburgite 90% > Ol > 40%, Cpx > 5%, Opx > 5% = Lherzolite 90% > Ol > 40%, Opx < 5% = Wehrlite 40% > Ol > 5%, Cpx < 5% = Olivine Orthopyroxenite 40% > Ol > 5%, Cpx > 5%, Opx > 5% = Olivine Websterite 40% > Ol > 5%, Opx < 5% = Olivine Clinopyroxenite Ol < 5%, Cpx > 10%, Opx > 10% = Websterite Sample 1: Ol = 60%, Opx = 20%, Cpx = 10% Lithology = ________________________ Sample 2: Ol = 67%, Opx = 30%, Cpx = 3% Lithology = ________________________ Sample 3: Ol = 71%, Opx = 1%, Cpx = 28% Lithology = ________________________ Sample 4: Ol = 35%, Opx = 17%, Cpx = 48% Lithology = ________________________ Sample 5: Ol = 97%, Opx = 2%, Cpx = 1% Lithology = ________________________

Explanation / Answer

Ordinary chloride contain 35-50wt% olivine 30wt% propene,and 5-20wt% nickel.

Most studies olivine orthoproxyne metal equilibrium of chlorides assume that the olivine and proxene composition were established at the peak metamorphic temperature where high diffusion rate promote equilibration

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