Variation Diagrams

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Variation Diagrams

• Plot of chemical constituents, groups of
  constituents, or ratios against each other
• Uses
• graphical portrayal of data
• testing of hypotheses of evolution
• classification

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Fractionation Indices

• Harker - SiO2
• Mafic Index
• MI FeO/(FeO MgO)
• Mg Number
• Mg Mg/(Mg Fe2)
• Solidification Index
• SI 100MgO/(MgO FeO Na2O K2O)
• Differentiation Index
• DI q or ab ne lc kp

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Closure Problem
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Closure Problem - Data
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AFM
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CaO-Na2O-K2O
Alteration and weathering
Normal Trend
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Peacock Diagram
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Shands Index
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QAP
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An-Ab-Or
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Discrimination Diagrams
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REE Diagrams
LREE Enrichment
Eu Anomaly
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Spider-diagrams