ask a geologist: plumes and plates · 2020-07-01 · (red) and cold (blue) structures in the mantle...
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Ask a Geologist:Plumes and Plates
By: Val Finlayson
© Johan Swanepoel
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About MeVal Finlayson● Most of the time: Isotope geochemist! Also:
cyclist, tinkerer (coding, paint, things that move), occasional musician
● PhD 2017, U. of Hawai’i-Mānoa, currently a postdoc researcher at U. of Maryland
● Favorite volcanoes: Lōihi, Arago Seamount
Ask A Geologist Series
(PHOTO OF YOU)
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Plates
Ask A Geologist Series
Source: globalchange.umich.edu
● “Plates” of crustal rock on Earth’s surface
● Continents, ocean basins
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Plates
Ask A Geologist Series
Source: globalchange.umich.edu
● “Plates” of crustal rock on Earth’s surface
● Continents, ocean basins
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Plates
Ask A Geologist Series
Brown et al. (2015)
Most volcanoes are at plate boundaries. What about these “intraplate ones?
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Plumes
Ask A Geologist Series
Hand et al. (2015)
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Plumes
Ask A Geologist Series
Hand et al. (2015)Koppers et al. (2001)
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Ask A Geologist Series
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Plates, plumes, and time
Ask A Geologist Series
Finlayson et al. (submitted)
● Plume chemistry tells us about what’s deep inside the Earth
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Plates, plumes, and time
Ask A Geologist Series
Finlayson et al. (submitted)
Konrad et al. (2018)
● And comparing plumes to each other tells us how things change deep in the Earth
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“Seeing” Earth’s interior
Ask A Geologist Serieshttps://www.youtube.com/watch?v=ztzeK2OjLEg
● Seismics “see” hot/dense (red) and cold (blue) structures in the mantle
● These circulate the mantle, driving plates AND plumes!
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Why Do We Care?A few reasons!1. Knowing plate tectonics helps us know more about
earthquakes and volcanoes2. Understanding how plumes work over time3. Looking for metals, resources that form in some
volcanic systems4. How do (habitable) planets work?
Ask A Geologist Series
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Deeper looks in time, planets
Ask A Geologist Series
USGS
Bernhard Steinberger
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Deeper looks in time, planets
Ask A Geologist Series
USGS
Bernhard Steinberger
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What’s nextUnderstanding what we see at the surface of a planet helps us “see” its interior better
Understanding how the Earth formed and changed with time, how it became able to support life
Ask A Geologist Series
© Johan Swanepoel
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Question Time!