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17 January 2018

Winter ichnology puzzle

Here’s a puzzler to warm up your chilly brain this Wednesday morning: Click to enlarge Figure out the story told by this set of imprints in the snow. The branch of science called ichnology studies the traces organisms leave behind. There’s a neat little story here. If you’ve got a guess, then you can check your answer by watching the video that this screenshot came from. It was posted on …

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24 October 2016

GIGAmacro views of komatiite

Erik Klemetti posted today at Eruptions about komatiite, which is apropos, considering I just finished imaging some samples of that ultramafic volcanic rock. Have a look at three samples from Barberton Greenstone Belt here, each from the 3.27 Ga Weltevreden Formation: Link GigaPan by Callan Bentley Link GigaPan by Callan Bentley Link GigaPan by Callan Bentley And, while we’re at it, here’s one from the Red Lake Greenstone Belt (~3.0 …

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2 May 2016

3D models to spin and twist

More 3D models: digital facsimiles of real rock samples. Check them out and explore! Clinker from the Powder River Basin, Wyoming: Ripple marks from the Rose Hill Formation, West Virginia: Meta-komatiite from the Red Lake Greenstone Belt, northern Ontario, Canada:

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3 July 2012

Granite dikes that have been folded and boudinaged

It seems like a good morning to return to Ontario, and to the Archean shear zones exposed at the Quetico/Wabigoon subprovince boundary of the Superior Craton. Readers will hopefully recall that I spent several days absorbing structural goodness from these rocks on a field trip before the Minneapolis GSA meeting last fall. The trip was led by Basil Tikoff, Bob Bauer, Dyanna Czeck, and Peter Hudleston. Our final Canadian stop …

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2 May 2012

Veins perpendicular to foliation

To recap the week so far here on Mountain Beltway: On Monday we looked at some sweet vertical boudinage along the plane of tectonic cleavage (not to mention those folds in a (formerly) horizontal granite dike, now bearing vertical axial planes), and then on Tuesday we looked at a horizontal cut through that same outcrop, and it showed moderately distorted lava pillows, And now today, let’s look at one more …

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1 May 2012

Deformed pillow basalts from southern Ontario

Have you ever seen Archean pillow basalts? How about Archean pillow basalts that have grown much taller through vertical extrusion along a ductile shear zone? Come to the southern Superior Craton to see more!

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30 April 2012

Exquisite boudinage in Ontario

Callan shares images of extraordinary boudinage outcrops in strained Archean meta-basalts on the Quetico-Wabigoon subprovince boundary within the southern Superior Craton. Ogle these gorgeous structures in awe and wonder.

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28 April 2012

Skype as an EASY method of connecting scientists and students

This week, I took 20 minutes out of my day to have a conversation with a group of students… …in Canada. As you can see, our conversation was not in person, but mediated by the Internet’s video conferencing technology service called Skype. A free Skype account and a video camera allows free, easy video conversations in real time, with people anywhere in the world. It is an absolutely amazing technology, …

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26 April 2012

Slickensides on a fault cutting granite

Another shot from my pre-GSA structural geology field trip to the Superior Craton last fall, up in southern Ontario, Canada. The image shows slickenlines coated with brownish fault gouge and oxide staining, cutting through a high-potassium granite (see fresh surface at upper left). The slickenlines are little gouged grooves where asperities (bumps) on the block of rock opposite this one ground into this rock along the fault surface as the …

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16 December 2011

Friday fold: granitoid wiggles

Another Friday fold from the pre-GSA Superior Craton field trip: Happy Friday. I’m setting this to auto-post on the day that my wife and I arrive in Johannesburg to start our honeymoon. I hope everyone’s doing well in my absence.

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