Displaced Dike and Contact Melting

July 02, 2015

Displaced Dyke SMALL

Contact Melt SMALL
Photographer: Markus Koleszar
Summary AuthorMarkus Koleszar
The photo at top shows an example of a dike displaced by a fault before it is crosscut by another dike as observed at Iron Point, Twin Islands, British Columbia. This minor fault can be seen running from the bottom center towards the top right. Note how the reddish colored band has been displaced by the fault. A small stick is in the picture for purposes of scale.
The bottom photo shows evidence of contact melting along the margin of a different dike; the one featured on this Earth Science Picture of the Day. The black host rock was partially melted and deformed when it came into contact with the intrusive iron-rich granitic rock. Photos taken July 26, 2014.
Photo Details: Top - Camera Model: NIKON D7000; Lens: 18.0-105.0 mm f/3.5-5.6; Focal Length: 18mm (35mm equivalent: 27mm); Aperture: ƒ/11.0; Exposure Time: 0.010 s (1/100); ISO equiv: 200; Software: Adobe Photoshop CS6 (Windows). Bottom - Same except: Focal Length: 22mm (35mm equivalent: 33mm); Exposure Time: 0.0080 s (1/125).