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A mineralogical analysis of pillow basalts to determine subglacial magmatic processes in Undirlithar quarry, Reykjanes Peninsula, Iceland

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by L. Bowman on 9 October 2013

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Transcript of A mineralogical analysis of pillow basalts to determine subglacial magmatic processes in Undirlithar quarry, Reykjanes Peninsula, Iceland

A mineralogical analysis of pillow basalts to determine subglacial magmatic processes in Undirhlíðar quarry, Reykjanes Peninsula, Iceland
Sources:

http://mapsof.net/iceland/static-maps/png/volcanic-system-of-iceland-map-fr
http://culturedecoded.wordpress.com/2008/08/05/the-truth-about-our-media/world-map-without-dots/
http://en.wikipedia.org/wiki/File:Subglacial_Eruption-numbers.svg
http://serc.carleton.edu/research_education/geochemsheets/wds.html
http://serc.carleton.edu/research_education/geochemsheets/techniques/EPMA.html
http://serc.carleton.edu/research_education/geochemsheets/techniques/SEM.html

Jakobsson, S.P., Jonsson, J., and Shido, F., 1977, Petrology of the Western Reykjanes Peninsula, Iceland: Journal of Petrology, v. 19, p.669-705.
Previous Work:

Todd Spillman '10~
Collected samples and made thin sections from East, South and West quarry walls
Concluded that lava viscosity and pillow size are not correlated
Future Work:
Take thin sections to the SEM at Oberlin to identify particular crystals we want to target with the EPMA
Collect more samples from Iceland
Take thin sections to the EPMA and acquire data
Synthesize what I've learned and what Becky Alcorn '11 concluded in order to make a well-researched statement about magmatic processes
Becky Alcorn '11~
Collected samples and made thin sections from South quarry wall
Field Results: Observations of the quarry walls indicated 3 different eruptive events and 2 different intrusive events
Mineralogical Results: 3 different magma types
Chemical Results: 2 different magmas, high MgO, low La/Sm and low MgO, high La/sm ratios
Mineralogical and chemical results
Concluded that a single parent magma model coudn't explain the data, must be more than one lava source
Intrusions with olivine
Intrusions without olivine
Extrusions
Dike 1
Dike 2
Sheet
Dike 3
Upper pillows
Middle Pillows
Lower Pillows
Knob Pillows
Mineralogy
Chemistry
High MgO/ Low La/Sm
Low MgO/ High La/sm
By Lindsey J. Bowman
Mined for aggregate, construction filler, now being reclaimed as a park
.2 km
S-10-11, Dike 2, Intrusion with olivine
S-10-15, middle pillows, extrusion
S-10-21, Dike 3, Intrusion without olivine
UND-E-01, East wall
UND-W-01, West wall
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