williams, m.l., cleveland, m., condit c.d university of massachusetts-amherst building a dynamic...
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Williams, M.L., Cleveland, M., Condit C.D
University of Massachusetts-Amherst
Building a dynamic image-based database:
Integrating thin section images and data using Dynamic Digital Maps.
CD-ROM Synthesis, 2002
East Lake Athabasca - Anhydrous felsic granulite
Grt
Kfs + Pl
Qtz
Sil
East Lake Athabasca - Anhydrous felsic granulite
Grt
Kfs + Pl
Qtz
Sil
Grt
Qtz
Sil
Bt
Pl
Qtz
3 mm
Legs Lake shear zone - Hydrated felsic granulites
Grt
Crd
Bt
0.5 mmSil
Hydrated felsic granulites
Retrograde assemblage: Grt +Bt + Crd + Sil + Pl + Qtz0.4-0.5 GPa, 550-600 °C
Thermobarometry
from Williams et al., 1995
1.0
0.8
0.6
0.4
0.2
GP
a
500 600 800 1000°C700 900
P-T pseudosection for hydrated felsic granulite
1.0
0.8
0.6
0.4
0.2
Pre
ssu
re [
GP
a]Felsic granulites - P-MH2O pseudosection
0.0 0.2 0.6 1.0 (1.5 wt% H2O)0.8MH2O
Monazite distribution in retrograde felsic granulite
Mapping-based approach - Full thin section X-ray maps
Grt
Bt
Monazite
Mg K
Felsic granulites - Monazite dating results
Felsic granulite evolution
Xnt:1800-1830 MA
East Athabasca, Canada P-T-t-D paths
0.8
0.6
0.4
0.2
GP
a
400 600 800 1000°C
1.2
1.0
Upper Granite Gorge, Grand Canyon
Upper Granite Gorge, Grand Canyon
Upper Granite Gorge, Grand Canyon
Upper Granite Gorge, Grand Canyon