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Pyromorphite-group minerals (PyGM), mainly pyromorphite [Pb 5 (PO 4 ) 3 Cl], mimetite [Pb 5 (AsO 4 ) 3 Cl], and vanadinite [Pb 5 (VO 4 ) 3 Cl], are common phases that form by supergene weathering of galena. Their formation is strongly influenced by processes at the Earth’s surface and in the soil overlying a lead deposit, and they incorporate high amounts of halogens, mostly Cl and, in some cases, F. The abundance of Br and I in natural PyGM and their potential as process tracers during surface and sub-surface fluid-rock interaction processes has not been investigated in detail due to analytical difficulties. We, therefore, developed methods for the simultaneous determination of Cl, F, Br, and I in PyGM for (1) powdered bulk samples via combustion ion chromatography (CIC) and (2) compositionally zoned crystals by means of secondary ion mass spectrometry (SIMS).

Crystallographic and fluid compositional effects on the halogen (Cl, F, Br, I) incorporation in pyromorphite-group minerals