Mount St. Helens may be a hot active volcano but it sits above a wedge of a rock known as "Cold Rock" of the North American plate tectonic.As geophysicist from the university of New Mexico Steven Hansen, was peeked only 40 kilometers under Mount St. Helens where the Juan de Faca tectonic plate melts during it sinks into the hot mantel beneath the North American plates fueling volcanoes all except Mount ST. Helens that stands about 50 kil. to the west. Hansen and his colleagues were expected to see a heat source under the mountain.Instead, using a thermal modeling revealed a type of rock called " serpentinite" . Serpentinite is a rock composed of one or more serpentinite group minerals which are from by serpentinization. This strange discovery shows how the local crust-mantel boundary looks like. https://www.sciencenews.org/article/mount-st-helens-cold-hearted-volcano?mode=topic&context=60&tgt=nr
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May 2017
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