Title

The role of crustal contamination and volatiles in the genesis of the Marathon PGE-copper deposit, Ontario: Constraints from micometre scale LA-ICP-MS lead isotope systematics and PGE distribution.

Date of Award

2003

Degree Type

Thesis

Degree Name

M.Sc.

Department

Geology

First Advisor

Samson, Iain,

Keywords

Geochemistry.

Rights

CC BY-NC-ND 4.0

Abstract

The Marathon deposit is a platinum group element (PGE)-Cu deposit hosted by the Coldwell intrusive complex, located on the north shore of Lake Superior, Ontario. Contradictory models have been proposed for the genesis of the deposit. This paper investigates the relative importance of different ore forming processes responsible for the PGE and Cu enrichment in the deposit and tests these contradictory models. A method has been developed for the precise determination of Pb isotope ratios in solid materials using quadrupole LA-ICP-MS. The advantages of this method are several, including; micrometer-scale spatial resolution, rapid analysis time, and low risk of contamination during sample preparation. Importantly, in samples with low Pb concentrations (∼2 ppm), quadrupole LA-ICP-MS, with N2 added to the nebulizer gas, can yield Pb isotope ratio measurements with a precision (0.2% RSE) that is comparable to LA-MC-ICP-MS. (Abstract shortened by UMI.)Dept. of Earth Sciences. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis2003 .C76. Source: Masters Abstracts International, Volume: 42-05, page: 1647. Advisers: Iain Samson; Brian Fryer. Thesis (M.Sc.)--University of Windsor (Canada), 2003.