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Callum D.J. Reekie

Callum D.J. Reekie

Ph.D. Research Student

Igneous Geochemistry

M03, Downing Site
Office Phone: +44 (0) 1223 333482

Research Interests

I am an igneous geochemist with an interest in how we can use the isotopic and geochemical properties of chalcophile (sulfur-loving) and siderophile (iron-loving) elements to understand processes that take place during crustal formation. I am a NERC funded research student and part of the NERC TeASe - Tellurium and Selenium Cycling and Supply consortium. 

Sulfur cycling in mid-ocean ridge and flood basalts

Sulfur is an important volatile in basaltic melts which controls the distribution of chalcophile elements between the mantle and various portions of the crust. Constraining the behaviour of sulfur in these melts is therefore important for understanding crust-mantle recycling, the sporadic distribution of ore deposits and chemical heterogeneity across different geological settings. My research aims to constrain the behaviour of sulfur in mid-ocean ridge and flood basalts settings by developing quantitative models which describe the solubility of sulfur in the melt as it differentiates and how chalcophile elements are affected by these processes.

Understanding sulfide-saturation with novel stable isotopes

Novel stable isotopic analysis (for example, Fe and Cu) is fast becoming a robust technique with which to place quantitative constraints on a variety of geological processes, both at high and low temperatures. Recent work has shown that the Fe isotope signature of basalts changes with differentiation as iron isotopes partition into the crystallising phases in different proportions. Similar results have been found for Cu as it partitions into immiscible sulfide liquid, however, much remains to be understood about how these techniques can apply to wider-scale processes. My research involves constraining how sulfide-saturation and possible fractionation partition Fe and Cu stable isotopes and the implication of these results for quantitatively modelling the distribution of chalcophile elements in basaltic melts. 


Petrology ; Geochemistry ; Stable isotopes ; Mineralogy


  • Continental flood basalts
  • Numerical Modelling
  • Icelandic Magmatism
  • Igneous petrology
  • Economic geology
  • Liquid immiscibility

Key Publications

Reekie, C.D.J. and Finch, A.A., 2017. Geochemical and Lu-Hf isotopic constraints on the petrogenesis of Ta-mineralisation in the Gardar rift: the Motzfeldt Centre, South Greenland. Applied Earth Science 126(2), p. 87. doi:10.1080/03717453.2017.1306286

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