AFM Diagram goes here petrology Tholeiitic series: Mg-rich olivine, followed by pyroxene, steers the crystallization path. Calc-alkaline series:

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Presentation transcript:

AFM Diagram goes here petrology Tholeiitic series: Mg-rich olivine, followed by pyroxene, steers the crystallization path. Calc-alkaline series: addition of magnetite balances Fe/Mg ratios to produce a straight crystallization path towards alkalis. K2O AFM Diagram goes here Lowland Creek Volcanic Field: an evolved component of a calc-alkaline magma series. Tectonic setting: Back-arc basin caldera complex.

SiO2 wt.% 48.6 Ma Tlca 62.6 - 65.2 andesite - dacite Tlcp 67.0 - 69.8 rhyodacite Tat 70.4 - 75.1 rhyolite Ts ~ 50 Ma -Lacustrine -Green River Formation. Tat 52.50 +/- 0.16 (plagioclase) 52.95 +/- 0.22 (biotite) Feeder dike: 52.64 +/- 0.20 ~ 52.8 Ma Tlcp Feeder dike: 51.79 +/- 0.25 (plagioclase) Different apparent ages in minerals of the same rock can be attributed to Ar-retentivity of phase (ex. Hornblende > biotite > plagioclase) due to post crystalization reheating. air fall/ surge 53.0 Ma

5140’

Eocene Time 53-49 Ma AMCC > 1 km normal offset ? ? ? ? Cauldron wall ? Great Falls Tectonic Zone ?

Mid-Late Miocene < 16 Ma Reynolds (1979)

Mid-Late Miocene < 16 Ma