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Geochemistry use in the Cascade Mountains

dlamberth

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I don’t setup videos well. But I thought I’d give it a go. In another thread geochemistry came up and it’s clear that some of us, myself included, could be better informed on the subject. And what do you know, this last Friday the video I linked below popped up. It’s 50min long so I don’t expect many will take the time to watch it. But the video, for those who like to learn new stuff, goes into not only how geochemistry is used by geologist in research but also how widely it’s used and its well it's usage is understood.

I’ve been following a series of on-line classed held by Nick Zentner who is a geology professor at Central Washington University. In this series which he’s calling A to Z of the South Cascades in Washington, Nick is exploring the geological growth of the Cascades. The Cascades being a fairly young mountain range began its first growth 45 million years ago. So, the question now is why are there areas of basalt that are 65 million years old popping up. Where did that older basalt come from? The running thought that’s being researched is that the subduction slab broke allowing lower older basalt beneath the slab a pathway to the surface. With out going into detail, the thought is that Yellowstone Hot spot plays a large part in the break of the subuction slab. Geochemistry seems to be verifying that idea. During the classes it became apparent the importance of geochemistry as a research tool to help understand what’s going on. That’s when Nick invited another professor to better explain geochemistry and how it’s being used in this research.

Enjoy the Geochemistry lesson.