A textural study of the distribution of cordierite in metapelitic hornfelses from the Bugaboo contact aureole (SE British Columbia): Implications for the.

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Presentation transcript:

A textural study of the distribution of cordierite in metapelitic hornfelses from the Bugaboo contact aureole (SE British Columbia): Implications for the mechanisms of metamorphic crystallization Petley-Ragan, A. and Gaidies, F. Department of Earth Sciences, Carleton University, Ottawa, ON, Canada GSA Meeting, Vancouver, October 19, 2014

Texture Quantification 3-dimensional data: Textures: CLUSTERED RANDOM ORDERED Rudge et al. (2008) Intro BugabooXR-µCT Segmentation ExtractionReduce3D Interpretation

Bugaboo Geological Setting Edited after DeBuhr (1999) Intro BugabooXR-µCT Segmentation ExtractionReduce3D Interpretation

Four metamorphic zones at kbar: (1)And Crd Chl( °C) (2)Bt And Crd Chl ( °C) (3)Bt And Crd ( °C) (4)Bt And Kfs Crd ( °C) Bugaboo Contact Aureole Edited after DeBuhr (1999) Intro BugabooXR-µCT Segmentation ExtractionReduce3D Interpretation Crd-forming reaction: Wm + Chl + Qtz → Bt + And + Crd + H 2 O

COB3-S1-5: Petrography Syn-kinematic biotite, plagioclase, andalusite and cordierite porphyroblasts in a foliated matrix of quartz, white mica, plagioclase and chlorite. Intro BugabooXR-µCT Segmentation ExtractionReduce3D Interpretation

COB3-S1-5: X-Ray Micro-Computed Tomography 12 µm pixel size Intro BugabooXR-µCT Segmentation ExtractionReduce3D Interpretation XR-µCT obtains 3D Data: X-Y-Z coordinates of Crd centers Volume of Crd

Cordierite Segmentation (COB3-S1-5) Full Segmentation Orthogonal Slice Segmentation Images taken from Blob3D (Ketcham, 2005) Intro BugabooXR-µCT Segmentation ExtractionReduce3D Interpretation

Cordierite Extraction (COB3-S1-5) CSD 540 Crystals 9.95 vol. % Crd Mean Volume = 1.25 mm³ Mean Aspect Ratio = 2.34 Intro BugabooXR-µCT SegmentationExtraction Reduce3D Interpretation

Scale-Dependent Statistics (Reduce3D) r = test distance c = shell width Reduce3D (Hirsch, 2000; 2011) Intro BugabooXR-µCT Segmentation ExtractionReduce3D Interpretation

Reduce3D (Hirsch, 2000; 2011) Test statistic False Ordering due to the hard core effect Scale-Dependent Statistics: Results (COB3-S1-5) Intro BugabooXR-µCT Segmentation ExtractionReduce3D Interpretation Clustering Correlation between size and distance at smallest scales Test statistic Clustering at 1.1 – 1.4 mm Average crystal size within clusters falls below the average population size

Test statistic Scale-Dependent Statistics: Results (COB3-S1-5) Intro BugabooXR-µCT Segmentation ExtractionReduce3D Interpretation Test statistic Correlation between size and distance within clusters = Ordering Reduce3D (Hirsch, 2000; 2011) Avg min axis x2 Avg max axis x2 ORDERED CLUSTERS

Interpretation of Cordierite Texture (COB3-S1-5) Clustering at 1.1 – 1.4 mm: inhomogeneous distribution of chemical nutrients. Clusters of smaller crystals than average: competition for chemical nutrients within crystal clusters. Diffusion-controlled cordierite growth at lengths scales of 1.4 mm. 1 mm Intro BugabooXR-µCT Segmentation ExtractionReduce3D Interpretation

Acknowledgements Dave Pattison and Chris Debuhr. Department of Geoscience, University of Calgary. Richard Ketcham, Romy Hanna and Matthew Colbert. Department of Geological Sciences, University of Texas at Austin. Funded by NSERC – Canada Graduate Scholarship: Master’s Program References DeBuhr, C. L Metamorphic petrology and mass balance analysis in the Bugaboo contact aureole. PhD Dissertation, University of Calgary. Hirsch, D. M Quantitative studies of porphyroblastic textures. PhD Dissertation, University of Texas at Austin. Hirsch, D. M Reduce3D: A tool for three-dimensional spatial statistical analysis of crystals. Geosphere, 7, p Ketcham, R Computational methods for quantitative analysis of three-dimensional features in geological specimens. Geosphere, 1, p Rudge, J. F., Holness, M. B. and Smith, G. C Quantitative textural analysis of packings of elongate crystals. Contrib Mineral Petrol, 156, p Questions?

Cordierite Chemistry (COB3-S1-5) Additional slides Mg 0.96 Fe 0.74 Na 0.30 Mn 0.02 Al 4 Si 5 O 18

Cordierite & Biotite Orientation Additional slides Maximum LengthMinimum Length Cordierite Biotite

Segmentation Error Additional slides Full Segmentation Volume = mm 3 Full Segmentation Ellipsoid Volume = mm 3 Ortho Slices Ellipsoid Volume = mm 3

Phase Equilibria COB3-S1-5 Additional slides

Biotite Scale-Dependent Statistics (Results) Additional slides