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Thread: These tiny, crackly bubbles are a new type of volcanic ash

  1. #1
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    Default These tiny, crackly bubbles are a new type of volcanic ash


    LAVA BUBBLES Researchers have discovered a new kind of ash, dubbed bread-crust bubbles, which are tiny spheres of ash no more than a millimeter in diameter that form deep underground.
    Credit: S. QUANE AND B. ANDREWS/SMITHSONIAN INSTITUTION

    Scientists have identified a new type of volcanic ash that erupted from a volcano in central Oregon roughly 7 million years ago. The particles are similar to larger bread-crust bombs, which form as gases trapped inside globs of lava expand, cracking the bombs’ tough exterior. Bread-crust bubbles, each no more than a millimeter wide, have a distinctly crackled surface that can reveal secrets about how volcanoes erupt, researchers reported November 4 at the Geological Society of America annual meeting in Indianapolis.

    The researchers had been sifting through other types of volcanic ash in the lab when they spotted the strange ash formations. Viewing the bits of ash through a scanning electron microscope revealed their crusty texture, indicating the gas bubbles expanded rapidly on their way up to Earth’s surface, but did not pop. Analysis of the texture also indicated the bubbles’ depth when they first exploded in the foamy magma. In the case of the Oregon sample, says volcanologist Ben Andrews of the Smithsonian Institution in Washington D.C., the frothy ash formed roughly 500 to 2,000 meters deep — a short distance, geologically — and erupted from the volcano at a rate of about 30 to 80 meters per second.

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    These tiny, crackly bubbles are a new type of volcanic ash (LINK)


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  2. #2
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    Default Re: These tiny, crackly bubbles are a new type of volcanic ash

    Are these nature's microballoons?

  3. #3
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    Default Re: These tiny, crackly bubbles are a new type of volcanic ash

    Quote Originally Posted by robm View Post
    Are these nature's microballoons?
    Nature's microplastics. Soon they'll be finding them in poop.
    If I use the word "God," I sure don't mean an old man in the sky who just loves the occasional goat sacrifice. - Anne Lamott

  4. #4
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    Default Re: These tiny, crackly bubbles are a new type of volcanic ash

    Do they float?

  5. #5
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    Default Re: These tiny, crackly bubbles are a new type of volcanic ash

    reminds me of the fly ash from coal fired power stations.
    It really is quite difficult to build an ugly wooden boat.

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