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Sulfide saturation in alkaline to peralkaline igneous rocks.

Subject Area Mineralogy, Petrology and Geochemistry
Term from 2015 to 2019
Project identifier Deutsche Forschungsgemeinschaft (DFG) - Project number 271894046
 
Final Report Year 2020

Final Report Abstract

Samples from several alkaline to peralkaline plutonic and sub-volcanic rocks where investigated for their sulfide inventory, their compositional variation and their S isotopic composition. The results of these studies revealed that (i) besides Fesulfides, chalcopyrite, sphalerite and galena are the most important sulfide minerals. In such rock types. (ii) Systematic compositional differences between sulfides in primitive and evolved rocks of a given locality can be interpreted in terms of magma differentiation (iii) Sulfur isotope variations in these samples are largely governed by the prevailing redox conditions during magma differentiation, cooling, and degassing/ fluid exsolution. Importantly, a global δ34S compilation for alkaline rocks and carbonatite reveals secular variation in alkaline magma sources, indicting changes in the sulfur isotopic composition of the lithospheric mantle and/or Ga timescales for deep crustal recycling.

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