Tectonic Setting Comparison: MORB, OIB and CM (Claire, Hana and Ryan)
Item
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Title
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Tectonic Setting Comparison: MORB, OIB and CM (Claire, Hana and Ryan)
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Description
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The tectonic settings for MORBs, OIBs and Convergent Margins are all very different. Magma that creates MORBs comes from the upper mantle. Since the upper mantle underneath a divergent boundary is responsible for producing so much magma, it is depleted in incompatible elements. OIBs on the other hand, are created by mantle plumes that are sourced from the core-mantle boundary. Since the plumes originate from the core-mantle boundary, they are rich in incompatibles. Island arcs from convergent margins originate from subduction zones. As the slab subducts, water from hydrated minerals escapes from hydrous mineral structures. The water then enters the surrounding mantle and lowers the melting temperature. Melt is then created and rises to the crust.
Image 1 from:
Winter, J. D. (n.d.). Igneous and Metamorphic Petrology Class Material.
Retrieved May 6, 2015, from https://www.whitman.edu/geology/winter/
JDW_PetClass.htm
Image 2 from:
Young, J. Cape Verde’s Eruption: An Example of Hotspot Volcanism. 1 Dec 2014. http://www.decodedscience.com/cape-verdes-eruption-example-hotspot-volcanism/51069
Image 3 from:
Winter, J. D. (n.d.). Igneous and Metamorphic Petrology Class Material.
Retrieved May 6, 2015, from https://www.whitman.edu/geology/winter/
JDW_PetClass.htm
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Creator
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Claire Kojaian
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Mediator
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Tamara Carley
carleyt@lafayette.edu
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Rights Holder
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Lafayette College Department of Geology and Environmental Geosciences
