Spatial correlation of magnetic properties, deformation fabrics, and paragenesis: insights from the Athabasca granulite terrane, northern Saskatchewan
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1 Spatial correlation of magnetic properties, deformation fabrics, and paragenesis: insights from the Athabasca granulite terrane, northern Saskatchewan Jeffrey R. Webber Laurie Brown, Michael L. Williams, Sean P. Regan University of Massachusetts, Amherst March 20, 2013 Jeffrey R. Webber (UMass-Amherst) AGT petrophysics March 20, / 24
2 Jeffrey R. Webber (UMass-Amherst) AGT petrophysics March 20, / 24
3 Motivating questions What can we learn through the integration of geophysical data and petrology to better understand metamorphic and structural processes at a variety of scales? How can we use the knowledge of this petrophysical architecture to aid in understanding ancient and modern crustal processes? Jeffrey R. Webber (UMass-Amherst) AGT petrophysics March 20, / 24
4 Geological context of the Athabasca granulite terrane Simplified map modified from Hanmer 1994 Aam 59 o 30'N R a e d o m a i n G r e a s er i v e r Lake Athabaska Axis mafic granulite Bohica mafic Abm complex Apm Ac Afg Fontaine Lake Chipman batholith Fehr granite Mary granite & Pine Amg associated Apm Channel granitoids diatexite Aam NT Map extent AB SK NU MB 25 km Reeve Lake Hud. Bay ON Amg C o r a Northwestern Central Chipman s h e a r L a k e Afg Abm s h e a r Ac Chipman Lake Selwyn Lake Bompas Lake z o n e L e g s L a k e s h e a r z o n e z o n e H e a r n e d o m a i n A t h a b a s c a B l a c k L a k e b a s i n 106 o W 105 o W Jeffrey R. Webber (UMass-Amherst) AGT petrophysics March 20, / 24
5 Magnetic patterning of the Athabasca granulite terrane Raw data provided by the Geological Survey of Canada Aam Abm Axis mafic granulite Bohica mafic complex Ac Afg Chipman batholith Fehr granite Amg Mary granite Apm Fontaine Pine & associatedlake Channel granitoids diatexite NT Map extent AB SK NU MB 25 km Hud. Bay ON nT Abm Selwyn Lake Bompas Lake 59 o 30'N R a e d o m a i n Reeve Lake Ac H e a r n e d o m a i n Amg Chipman Lake Lake Athabasca Apm Aam Apm A t h a b a s c a Afg B l a c k L a k e b a s i n 106 o W 105 o W Jeffrey R. Webber (UMass-Amherst) AGT petrophysics March 20, / 24
6 Magnetic expression of the Chipman domain km MARY LAKE 3 (tonalite) EAST HAWKES LAKE CORA LAKE 4 (mafic granulite) LYTLE LAKE 2 (tonalite) CHIPMAN LAKE LEGS LAKE 1 (tonalite) Jeffrey R. Webber (UMass-Amherst) AGT petrophysics March 20, / 24
7 Chipman tonalite samples: 1, 2, &3 Photo by: Sean P. Regan Jeffrey R. Webber (UMass-Amherst) AGT petrophysics March 20, / 24
8 Chipman tonalite samples: 1, 2, &3 Isothermal remanent magnetization IRM acquisition curves Chipman tonalite IRM (A/m) 1e Magnetite saturation Magnetizing field (T) Jeffrey R. Webber (UMass-Amherst) AGT petrophysics March 20, / 24
9 SEM image: sample 1 (width mm) Jeffrey R. Webber (UMass-Amherst) AGT petrophysics March 20, / 24
10 SEM image: sample 1 (width mm) Jeffrey R. Webber (UMass-Amherst) AGT petrophysics March 20, / 24
11 SEM image: sample 2 (width 2 mm) Jeffrey R. Webber (UMass-Amherst) AGT petrophysics March 20, / 24
12 Mafic granulite sample: km MARY LAKE 3 (tonalite) EAST HAWKES LAKE CORA LAKE 4 (mafic granulite) LYTLE LAKE 2 (tonalite) CHIPMAN LAKE LEGS LAKE 1 (tonalite) Jeffrey R. Webber (UMass-Amherst) AGT petrophysics March 20, / 24
13 Mafic granulite sample: 4 Photo by: Sean P. Regan Jeffrey R. Webber (UMass-Amherst) AGT petrophysics March 20, / 24
14 Mafic granulite sample: 4 Heterogeneous magnetic susceptibility A B Relative suscept A 7.32e B 7.51e C 7.41e Jeffrey R. Webber (UMass-Amherst) AGT petrophysics March 20, / 24
15 SEM image: A (width 2 mm) Jeffrey R. Webber (UMass-Amherst) AGT petrophysics March 20, / 24
16 SEM image: B (width 2 mm) Jeffrey R. Webber (UMass-Amherst) AGT petrophysics March 20, / 24
17 SEM image: C (width 2 mm) Jeffrey R. Webber (UMass-Amherst) AGT petrophysics March 20, / 24
18 Mafic granulite sample: 4 Whole section compositional gradient in garnet Jeffrey R. Webber (UMass-Amherst) AGT petrophysics March 20, / 24
19 Mafic granulite sample: 4 Garnet compositional mapping Jeffrey R. Webber (UMass-Amherst) AGT petrophysics March 20, / 24
20 Mafic granulite sample: 4 Garnet quantitative analyses Jeffrey R. Webber (UMass-Amherst) AGT petrophysics March 20, / 24
21 Iron rich garnet with magnetite tails (width 2 mm) Jeffrey R. Webber (UMass-Amherst) AGT petrophysics March 20, / 24
22 Implications for iron oxidation state Percent volume Volume of phases vs. X FeO 1 GPa 830 o C 0.75 H 2 O Anorthite Pargasite Quartz Orthopyroxene Hematite Diopside Rutile Magnetite Almandine Albite Ilmenite Fe2O3-FeO Jeffrey R. Webber (UMass-Amherst) AGT petrophysics March 20, / 24
23 Jeffrey R. Webber (UMass-Amherst) AGT petrophysics March 20, / 24
24 Acknowledgments The efforts of many individuals have provided the means to investigate the questions presented herein. Laurie L. Brown, Sean P. Regan, Michael L. Williams, Kevin Mahan With funding provided by: National Science Foundation Jeffrey R. Webber (UMass-Amherst) AGT petrophysics March 20, / 24
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