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Stability of Melt Rich Channels

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Information about Stability of Melt Rich Channels

Published on July 9, 2008

Author: Kristyn

Source: slideshare.net

Description

Presentation for COSPAR 2008 - Montreal Canada
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Stability of melt-rich channels in Earth’s mantle High Pressure and Temperature Experiments of Olivine, Chromite and Mid-Ocean Ridge Basalt (MORB) Kristyn Rodzinyak Dan King, PhD student, Rock and Mineral Physics Lab, Department of Geology and Geophysics, University of Minnesota, Minneapolis Mark Zimmerman, UMN David Kohlstedt, UMN

Melt Transport Modeling Mantle Convection http://www.yorku.ca/esse/veo/earth/image/1-3-2. JPG

Modeling Mantle Convection

Stress Driven Melt Segregation Mid-Ocean Ridges Subduction Zones http://www.waterencyclopedia.com/images/wsci_03_img0352.jpg http://sio.ucsd.edu/volcano/about/images/recycle.gif http://visearth.ucsd.edu/VisE_Int/platetectonics/hotspot2.jpg Hot Spots

Mid-Ocean Ridges

Subduction Zones

Hot Spots

Samples Composition 4 to 1 by volume 8 µm olivine and 2 µm chromite 4% mid-ocean ridge basalt (MORB) Torsion Static Anneal

Composition

4 to 1 by volume 8 µm olivine and 2 µm chromite

4% mid-ocean ridge basalt (MORB)

Sample Preparation Deformation Assembly

Experiments Gas-medium deformation apparatus PI-10 300 MPa ~10 Km depth Torsion Actuator Pressure Vessel Leak Detector Thermocouple

Torsion, 1473K, 300 MPA Data during first deformation. A slow leak (1MPa/ 6 mins) caused the termination of the experiment. Torsion, 1473K, 200MPa Second deformation on sample once rejacketed. Run terminated due to a slip along a boundary indicated by a drastic drop in plots.

Melt-Rich Bands 1000µm No Bands Bands Bands

Results-Torsion Distance (microns) 20 µm

Results-Static Anneal Distance (microns) 20 µm

Scanning Electron Microscope 2 µm

Quenched 1 hour anneal 10 hour anneal

Conclusions Bands still visible after 10 hour anneal Suggests driving force for segregation stronger than the dissipation force Surface tension driven flow tends to homogenize melt distribution through time On planetary objects where gravity is less than that of Earth, surface tension would likely play a larger role

Bands still visible after 10 hour anneal

Suggests driving force for segregation stronger than the dissipation force

Surface tension driven flow tends to homogenize melt distribution through time

On planetary objects where gravity is less than that of Earth, surface tension would likely play a larger role

David Kohlstedt’s Rock and Mineral Physics Lab

Special Thanks To… David Kohlstedt’s Rock and Mineral Physics Lab Funding provided by NASA’s PGGURP: Planetary Geology and Geophysics Undergraduate Research Program

David Kohlstedt’s Rock and Mineral Physics Lab

Funding provided by NASA’s PGGURP: Planetary Geology and Geophysics Undergraduate Research Program

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