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Cordilleran Section - 113th Annual Meeting - 2017

Paper No. 37-4
Presentation Time: 2:35 PM

THE INFLUENCE OF HYDROUS MELTING ON THE ELECTRICAL CONDUCTIVITY IN FELDSPAR LABRADORITE


AMULELE, George1, CLARK, Simon2 and LANATI, Anthony2, (1)Hawaii Institute of Geophysics and Planetology, University of Hawaii at Manoa, 2525 Correa Road, Honolulu, HI 96822; Department of Earth and Planetary Sciences, Macquarie University, North Ryde, Balaclava Road, NSW, Sydney, 2109, Australia, (2)Department of Earth and Planetary Sciences, Macquarie University, North Ryde, Balaclava Road, NSW, Sydney, 2109, Australia, amulele@hawaii.edu

The electrical conductivity of a single crystal of feldspar labradorite has been carried out under hydration melting conditions at 1 GPa. Hydration and melting were achieved by enclosing the sample in a talc sleeve and carrying out the conductivity measurements above the dehydration temperature of talc (800oC), which is also the melting point of most plagioclase feldspars at ambient pressure. Electrical conductivity measurements were obtained using the impedance spectroscopy method at temperatures between 300oC and 1100oC and the conductivity behavior in labradorite determined upon melting. At least 800 ppm wt. uptake of water was measured in the crystal at saturated water conditions. The electrical conductivity in single crystal labradorite has been analysed using the Hashin and Shtrikman mixing model to determine the melt fraction and hydrous melt conductivity in the mineral.

Session No. 37

T15. Mineral Physics Research Aspects Related to Deep Earth’s Interior and Phenomena II
Wednesday, 24 May 2017: 1:30 PM-2:55 PM
Room 318B (Hawai‘i Convention Center)
Geological Society of America Abstracts with Programs. Vol. 49, No. 4
doi: 10.1130/abs/2017CD-293039
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