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Strain partitioning into dry and wet zones and the formation

AL

Aaron Leonard

Transcript

Myrmekite

Strain partitioning into dry and wet zones and the formation of Ca-rich myrmekite in syntectonic syenites: A case for melt-assisted

dissolution-replacement creep under granulite facies conditions

G.B. De Toni, M.F. Bitencourt , L.V.S. Nardi

Symplectite formed by vermicular quartz in plagioclase, in contact with or replacing an adjacent feldspar

Mineral Composition

Symplectite: micro-scale intergrowth of two or more crystals

Take-aways

Source

High Strain Zones: Partitioning into Wet & Dry Zones

Break down of garnet into orthopyroxene and plagioclase Symplectite

Toni, G.b. De, et al. “Strain Partitioning into Dry and Wet Zones and the Formation of Ca-Rich Myrmekite in Syntectonic Syenites: A Case for Melt-Assisted Dissolution-Replacement Creep under Granulite Facies Conditions.” Journal of Structural Geology, vol. 91, 2016, pp. 88–101., doi:10.1016/j.jsg.2016.08.002.

  • In low strain zones myrmekite forms at Kfs grain boundaries, suggesting exsolution
  • In deformed zones, heterogeneous fluid magma injections lead to strain partitioning into wet and dry zones

Presentation by Aaron Leonard

Dissolution of clinopyroxene by fluid rich late magmatic liquids release Ca++ to replacement reactions of K-feldspar by Myrmekite

Wet zone Microstructures

Dry zone microstructures

  • Low strain zone and high strain zone show similar mineralogy
  • Myrmekites in wet zones suggest fluid-magma facilitated genesis

A Controversial History

Microstructures in Low Strain Zones

  • Myrmekite (inset highlight, figure a) between two K-feldspars
  • Wherever two Kfs megacrysts touch, swapped rim-microstructures devolop, either as perthite or as myrmekite
  • Becke: Genesis by replacement (1908)
  • Schwantke: Genesis by exsolution (1909)
  • Phillips: Exsolution model for undeformed granitoids, replacement model for deformed and metamorphosed rocks (1980)

Arroio das Palmas Syenite

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