Impurities and crystal defects within the semiconducting bulk of a metal sulfide introduce energy levels within the forbidden bandgap. These levels in turn control semiconducting type and local electrical properties within single and multi-phased sulfide assemblages. Heterogeneity in sulfide semiconductivity linked to these impurities can lead to p-n micro-junction formation and potential distributions near the surface that may alter redox reactivity. Secondary gold ore genesis via a micro-galvanic effect related to heterogeneity has in the past been hypothetically linked to such micro-junctions. Understanding these regions and their interaction with weathering fluids in the regolith for example requires large-scale imaging of potential distributions associated with near-surface micro-junctions and correlation with the responsible elemental distributions. Here we investigate the existence of micro-electronic junctions in a mixed sulfide assemblage using scanning laser beam induced current (LBIC) and correlate them with pyrite-chalcopyrite interfaces mapped using combined energy-dispersive spectroscopy (EDS) and wavelength-dispersive spectroscopy (WDS) on an electron hyper-probe. Junctions in a natural assemblage are positively identified for the first time.

Item Type:	Refereed Article
Keywords:	pyrite, heterogeneity, semiconductors, electrical properties, micro-junction, heterojunction, chalcopyrite, laser beam induced current, elemental mapping, metal ore genesis, electrochemical
Research Division:	Earth Sciences
Research Group:	Geology
Research Field:	Ore Deposit Petrology
Objective Division:	Mineral Resources (excl. Energy Resources)
Objective Group:	Other Mineral Resources (excl. Energy Resources)
Objective Field:	Mineral Resources (excl. Energy Resources) not elsewhere classified
Author:	Large, R (Professor Ross Large)
ID Code:	98219
Year Published:	2015
Deposited By:	Centre for Ore Deposit Research - CODES CoE
Deposited On:	2015-02-05
Last Modified:	2017-11-02
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