Hydrous melting of labradorite

an electrical conductivity investigation

Anthony Lanati, George M. Amulele, Simon M. Clark

Research output: Contribution to journalMeeting abstract

Abstract

Electrical conductivity, via the geophysical method of magnetotellurics (MT), gives us amazing insight into the crust and mantle zone. However, the conductivity of many minerals is poorly constrained inhibiting the interpretation of these MT data. In the work presented here we build on work to measure the electrical conductivity of a single crystal of labradorite feldspar at crustal conditions (Amulele et al., 2017) has been carried out under crustal 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 (800 °C), 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 300°C and 1100 °C and the conductivity behaviour 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. A preliminary version of this work was presented at GSA Cordilleran Section meeting July 2017.

Reference
Amulele, G. M., Lanati, A. W., & Clark, S. M. (2017). Electrical conductivity measurements of labradorite investigated at crustal conditions of pressure and temperature. (Submitted to Physics and Chemisry of Minerals, July 2017).
Original languageEnglish
Pages (from-to)70
Number of pages1
JournalGeological Society of Australia Abstract
Issue number125
Publication statusPublished - 2017
EventGSA Earth Science Student Symposium (GESSS) NSW - Macquarie University, Sydney, Australia
Duration: 10 Nov 201710 Nov 2017
https://gesssnsw.wixsite.com/home

Fingerprint Dive into the research topics of 'Hydrous melting of labradorite: an electrical conductivity investigation'. Together they form a unique fingerprint.

  • Cite this