Developing a new model for the emplacement of magmatic sulphide megabreccias in the Zambezi Supracrustal Sequence

Magmatic sulfide deposits (MSD) are the world’s primary source of Ni and PGE, and major producers of Cu. One of the most prospective geological locations for magmatic Ni-Cu-PGE sulfide deposits are conduit systems above and below magma chambers. Most traditional models involve sulfide formation at depth, with them being swept up into their current position. However, new models for sulfide breccia formation in conduits involve downward movement of sulfide liquids [1], which require a major shift in approach towards ore genesis and exploration models.

The Munali Ni deposit, Zambia, is a conduit-hosted ultramafic megabreccia with massive sulfide matrix [2]. It is located close to a craton margin; a setting recently identified as highly prospective for the development of MSDs [3], within the Zambezi Supracrustal Sequence (ZSS). Traditional models have advocated upward movement of magmas and sulfides, but recent reassessment of this may reclassify the model for formation. This project will redefine the model for ore genesis and represent the first systematic study ever to be undertaken on the Munali deposit, with major implications for the interpretation of similar deposits worldwide.

The aims are to:
(1) Develop a robust model for magmatic emplacement and ore genesis that can help define further resources in the ZSS.
(2) Determine the role of crustal contamination in ore genesis and characteristics,
(3) Investigate the distribution of ore metals along strike and down dip to identify feeder zones and magma pathways.
(4) Define implications for exploration for other magmatic intrusions in the region using a range of geochemical proxies for sulfide mineralisation
(5) Provide new constraints on emplacement dynamics for this type of deposit.

This project is a superb opportunity for a student to apply a wide range of techniques in economic geology research to industrially-relevant problems. It will provide the student with excellent employability skills applied to a career in either research or the minerals industry.

Applicants should have some experience of economic geology, field work, geochemical or mineralogical research, preferably in magmatic deposits. Some industry experience is desirable, but not essential.