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Minnesota Geology > Soudan Banded Iron Formation detail by ahochstaedter

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About This Gigapan

Taken by
ahochstaedter ahochstaedter
Explore score
0.07 Gigapixels
Date added
Dec 16, 2011
Date taken
Oct 07, 2011

A closer look at the Archean Soudan Banded Iron Formation in northern Minnesota. The outcroop is located at Soudan State Park, site of the oldest Iron mine Minnesota.

More details and a broader view here:
gigapan.org/gigapans/94833Glacial striations on this outcrop trend from the top towards the bottom of the image.

In this outcrop the prominant folds are F2, and have near vertical axes.

The structure in the upper left of the image is puzzling. I orignally thought it was a doubly plunging fold, but I can't get my mind around that explanation if the isoclinal folds have near vertical axes. Any ideas?

Zooming in on this image reveals millimeter scale laminations, perhaps resulting from differing proportions of Silica and Iron precipitating out of the anciant ocean. Why these variations occur is open to debate. Seasons? El Nino or PDO-like oceanic variations? Decades? Centuries? Millenia?

An even closer view is here:
zoom.it/O0KE Will open in a new tab or window I am indebted to Mark Jirsa and John Green for leading a pre-GSA field trip to these rocks in October, 2011.

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Stitcher Notes


GigaPan Stitch version 1.0.0805 (Windows)
Panorama size: 68 megapixels (10708 x 6432 pixels)
Input images: 9 (3 columns by 3 rows)
Field of view: 0.6 degrees wide by 0.4 degrees high (top=0.3, bottom=-0.1)
All default settings
Original image properties:
Camera make: PENTAX
Camera model: PENTAX K-r
Image size: 4288x2848 (12.2 megapixels)
Capture time: 2011-10-07 14:57:37 - 2011-10-07 14:58:02
Aperture: f/7.1
Exposure time: 0.003125
ISO: 800
Focal length (35mm equiv.): 82.0 mm
White balance: Fixed
Exposure mode: Manual
Horizontal overlap: 29.3 to 49.6 percent
Vertical overlap: 35.9 to 63.8 percent
Computer stats: 8098.69 MB RAM, 8 CPUs
Total time 2:24 (16 seconds per picture)
Alignment: 39 seconds, Projection: 24 seconds, Blending: 1:21
(Preview finished in 1:49)

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