Banner
    Friday Geophoto: Iguazú Falls
    By Gareth Fabbro | December 16th 2011 02:15 AM | 3 comments | Print | E-mail | Track Comments
    About Gareth

    For those of you who are not geologists, a tuff is a volcanic rock, made up of solidified ash. Hence the pun as my blog title. Actually, my research...

    View Gareth's Profile
    I'm getting my geophoto today in early, as it is the lab's Christmas party tonight...

    Today's photo is of Iguazú Falls, which straddle the Argentina/Brazil border (spelt Iguaçu on the Brazilian side).

    I posted this picture mainly because it is pretty, and waterfalls are geological, right?  But if you do want some geology, the rocks that you can just about make out behind all the water and vegetation are basalts, and a particular type of formation known as a flood basalt.  Flood basalts represent periods of intense volcanism, and are sometimes thought to lead to mass-extinction events.  They are thought to happen when a new plume of hot material rises through the mantle and reaches the crust, and often occur around the breakup of continents.  The flood basalts here were erupted about 100 million years ago, during the opening of the South Atlantic.  Some of the same flood basalts are found today in Africa.

    Iguacú Falls

    Comments

    Fred Phillips
    Iguaçu is utterly awesome. Add it to your bucket list!
    SynapticNulship
    OMG is it a double rainbow...all the way? OMG...
    Bonny Bonobo alias Brat
    Beautiful photo.
    My article about researchers identifying a potential blue green algae cause & L-Serine treatment for Lou Gehrig's ALS, MND, Parkinsons & Alzheimers is at http://www.science20.com/forums/medicine