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Thin Section of Garnet Schist with Pseudotachylite Vein from the Eastern Border Fault of the Mesozoic Basin, Massachusetts by Paul Karabinos

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About This Gigapan

Taken by
Paul Karabinos Paul Karabinos
Explore score
1.01 Gigapixels
Date added
Jan 29, 2014
Date taken
Jan 28, 2014

Sample Montague 199. Thin section of garnet schist from drill core through the Eastern Border Fault on the Mesozoic Basin in Montague, Massachusetts. Dark area that dominates field of view is a pseudotachylite vein that formed when frictional heating during an ancient earthquake partially melted the rock. The melt filled a straight-walled fracture in the rock and solidified quickly. Over time, the glass devitrified. Flow banding is apparent in the vein. The very dark bands at the vein boundaries may have formed as ultracataclasite before the generation of melt. The rounded grains in the vein suggest partial melting of angular grain margins. Muscovite and biotite are abundant in the matrix but absent in the vein suggesting that micas melted during frictional heating. Dextral asymmetry defined by color bands on both vein margins suggests continued displacement during melt quenching.
Thanks to Dave Moecher from the University of Kentucky for his comments on the pseudotachylite textures.
Field of view is approximately 8 by 4 mm.
Plane Polarized light.
Taken with the automated thin section imaging system at Williams College.

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Stitcher Notes


GigaPan Stitch.Efx version 2.3.0307 (Windows)
Panorama size: 1009 megapixels (43836 x 23024 pixels)
Input images: 150 (15 columns by 10 rows)
Field of view: 2.5 degrees wide by 1.3 degrees high (top=1.2, bottom=-0.1)
Vignette correction on: c1=-0.0316 c2=-0.00937
Use BRISK feature detector
Original image properties:
Camera model: NIKON D7000
Image size: 4928x3264 (16.1 megapixels)
Capture time: 2014-01-28 10:40:55 - 2014-01-28 10:54:44
Aperture: f/0
Exposure time: 0.025
ISO: 100
Focal length (35mm equiv.): unknown
Digital zoom: off
White balance: Fixed
Exposure mode: Manual
Horizontal overlap: 38.1 to 81.0 percent
Vertical overlap: 29.4 to 37.4 percent
Computer stats: 16372.2 MB RAM, 16 CPUs
Total time 32:19 (13 seconds per picture)
Alignment: 8:05, Projection: 8:42, Blending: 15:31
(Preview finished in 25:19)
Color Adjustments:
white: 75.8
gamma: 0.80
exposure: 0.2

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