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