HIGH-T TOPIC 3: CRYSTALLISATION & TRACE ELEMENT MODELLING

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11 Terms

1
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Equilibrium crystallisation

crystals remain in contact with melt and re-equilibrate

2
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Fractional crystallisation

crystals are removed causing melt to evolve

3
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Why fractional crystallisation matters

produces strong enrichment of incompatible elements

4
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Rayleigh equation

Cl = C0F^(D−1) describes melt evolution

5
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Bulk distribution coefficient

weighted average D accounting for all minerals

6
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Partial melting behaviour

low melt fractions enrich incompatible elements

7
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REE patterns in melting

steep slopes indicate low degree melting

8
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Eu anomaly meaning

indicates plagioclase control or redox effects

9
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Fun exam fact

trace element modelling can identify which minerals crystallised first

10
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Diagram card – Crystallisation

draw REE patterns for fractional crystallisation

11
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Calculation card – Rayleigh

show how decreasing F increases Cl for D ≪ 1