Deformed monazite yields high-temperature tectonic ages
- Erickson, T.
- Pearce, M.
- Taylor, Richard
- Timms, Nicholas Eric
- Clark, C.
- Reddy, Steven
- Buick, I.
DOIAbstract
The deformation of monazite in the polymetamorphic Sandmata granulite complex in India has been investigated by electron backscattered diffraction and sensitive high-resolution ion microprobe (SHRIMP). Quantitative microstructural analyses document the development of deformation twins in {100}, {001}, and Graphic orientations; low-angle (<10°) boundary development associated with dislocation creep; and the development of new grains due to dynamic recrystallization. These data represent the first quantitative evidence of crystal-plastic deformation of natural monazite. SHRIMP U-Th-Pb analysis shows that the host monazite preserves discordant ages as old as 1666 ± 28 Ma, along a trend from ca. 1720 Ma to ca. 1000 Ma, with increasingly discord...
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