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PRIMARY MINERAL SEQUENCE McClelland’s Weathering Sequence Bowen’s Reaction Series olivine pyroxene amphibole biotite calcium - rich plagioclase sodium.

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Presentation on theme: "PRIMARY MINERAL SEQUENCE McClelland’s Weathering Sequence Bowen’s Reaction Series olivine pyroxene amphibole biotite calcium - rich plagioclase sodium."— Presentation transcript:

1 PRIMARY MINERAL SEQUENCE McClelland’s Weathering Sequence Bowen’s Reaction Series olivine pyroxene amphibole biotite calcium - rich plagioclase sodium - rich orthoclase ( k-rich ) muscovite quartz 800 ° C 1400 °C mafic (basic) intermediate felsic (acidic) Discontinuous Branch Continuous Branch ( orthoclase ) Less resistant More resistant

2 PRIMARY MINERAL SEQUENCE McClelland’s Weathering Sequence Bowen’s Reaction Series olivine pyroxene amphibole biotite calcium - rich plagioclase sodium - rich orthoclase ( k-rich ) muscovite quartz 800 ° C 1400 °C mafic (basic) intermediate felsic (acidic) Discontinuous Branch Continuous Branch ( orthoclase ) andesite dacite rhyolite Less resistant More resistant

3 AcidicIntermediate Mafic Coarse : granite monzonite gabbro Medium : (--) porphyry (--) porphyry diabase Fine : rhyolite latite andesite (Na), basalt (Ca)

4 p. 5-4, Field Book …, 2002

5 vesicular basalt (in lava flow) Kilbourne Hole, NM Schoeneberger

6 rhyolite from Organ Mtns, NM Schoeneberger

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