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Possible compositional effects on the electrical conductivity of olivine: a preliminary study

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posted on 29.03.2022, 01:54 by Anthony William Lanati
Volatile sensitive probes of the upper mantle, such as magnetotellurics, are being developed to overcome insensitivities in seismic and gravity subsurface mapping as part of an effort to identify the location of deeply buried ore deposits, in addition to more broadly understanding mantle temperature and water contents. An understanding of the conductivity of mantle minerals is an essential prerequisite to the full interpretation of magnetotelluric data. Current proton conduction models for simple mineral systems, such as olivine, show large discrepancies. The material used for these determinations, San Carlos peridotite, is not a single mineral phase and may have compositional variations. This could be one of the origins of these discrepancies. To test this hypothesis, a sample of San Carlos olivine was taken and separated out the mineral components using a combination of electrostatic rock disaggregation, magnetic susceptibility as well as manual separation. The separated fractions were characterised using petrography. Impedance data were collected as a function of temperature and pressure in a multi-anvil press from both the separated olivine material and the original mixture. Comparison of these values with literature data has been made. .


Table of Contents

1. Introduction -- 2. Experimental methods -- 3. Results -- 4. Discussion -- 5. Conclusions.


Bibliography: pages 55-58 Empirical thesis.

Awarding Institution

Macquarie University

Degree Type

Thesis MRes


MRes, Macquarie University, Faculty of Science and Engineering, Department of Earth and Planetary Sciences

Department, Centre or School

Department of Earth and Planetary Sciences

Year of Award


Principal Supervisor

Simon Clark

Additional Supervisor 1

Juan Carlos Afonso

Additional Supervisor 2

Tracy Rushmer


Copyright Anthony William Lanati 2016. Copyright disclaimer: http://mq.edu.au/library/copyright




1 online resource (x, 65 pages) colour illustrations

Former Identifiers

mq:56597 http://hdl.handle.net/1959.14/1157517