1. Welcome to NikonCafe.com—a friendly Nikon camera & photography discussion forum!

    If you are thinking of buying a camera or need help with your photos, you will find our forum members full of advice! Click here to join for free!

Geology at Latrabjarg Cliff, Breidafjord, Iceland

Discussion in 'Landscapes, Architecture, and Cityscapes' started by bobhoge, Jun 29, 2007.

  1. We had a great example of how these volcanic islands are formed when we sailed past Latrabjarg Cliff, Breidafjord, on our voyage around Iceland.

    Iceland is located on the mid-atlantic ridge, where the ocean is opening up at about the same rate as your fingernails grow. Half of the island is attached to North America and half to Europe.

    First you get lots of volcanic eruptions each laying down a layer of basalt and a layer of ash. Since the basalt and ash erode at different rates, the weathering along a cliff will show the layers:
    167769274-L.jpg
    Subscribe to see EXIF info for this image (if available)


    Sometimes you get a lot of erosion:
    167769242-L.jpg
    Subscribe to see EXIF info for this image (if available)


    There are also a lot of earthquakes that open up cracks and fisures in the layers. When another eruption happens the hot magma will work up through the fisure to reach the surface since it is the weak spot. When it cools it leaves a dyke of new material intruding through the old layers:
    167771896-L.jpg
    Subscribe to see EXIF info for this image (if available)


    You can see the line of newer material sticking up all the way to the top of the hill:
    167771979-L.jpg
    Subscribe to see EXIF info for this image (if available)


    A closer look at the dyke going up through a couple of layers:
    167771932-L.jpg
    Subscribe to see EXIF info for this image (if available)


    Lindblad almost always has a geologist as one of the experts aboard. He got a workout on this trip.

    Bob & Nan
     
  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.