Contributions to Mineralogy and Petrology

Abstract Chlorine is a key volatile in magmatic and volcanic systems, being a major consumer of atmospheric ozone and an important ligand for metal transport. Despite chlorine’s importance however, the combined effects of melt composition and H₂O on Cl solubility and HCl degassing remain poorly constrained, particularly at magmatic pressures. We present high-pressure (0.5–1.63 GPa), 1200 °C exper…

Abstract Metamorphic reactions provide crucial insights into the conditions that rocks experienced and significantly influence their rheological behaviour. However, some reactions are challenging to identify in the rock record. This study focuses on zonation and microstructures in plagioclase as indicators of metamorphic history, employing a case study from Lofoten, northern Norway, where various…

Marialite (Na3Al3Si9O24·NaCl), the chloride end-member of the scapolite mineral group, is important for determining the chloride content of a paleofluid from which Cl-bearing scapolite formed as well as its potential role in the geochemical cycling of chlorine in tectonically active zones. Experiments on the upper-pressure stability of synthetic marialite breaking down to jadeite + coesite + hali…

The online version contains supplementary material available at 10.1007/s00410-026-02299-9.

In several studies of chromite-rich cumulates in layered intrusions, the Cr/Al ratio of chromite varies significantly within centimetre-to-decimetre scale layering. In the G-H chromitite section of the Stillwater Complex (United States), Cr/Al ratios are consistently higher, by up to relative 20%, in the most chromite-rich rocks compared with immediately adjacent layers. Systematic relationships …

Abstract In zircon, transgressive textures cutting oscillatory zoning and associated chemical modifications are usually attributed to fluid-mediated coupled dissolution-precipitation (CDP). Here, we show an example of melt-mediated CDP in zircon from metagranite, with consequences on calculated ages and chemical composition. Zircon oscillatory zoning is commonly blurred and truncated by embayment…

Abstract Understanding the textural cues hidden within cumulate rocks is a crucial component to decoding their formational processes and development throughout the active lifetime of their parental intrusions. However, given the complicated nature of field observations, often resulting in contrasting interpretations, the studies of cumulates benefit from an effective use of textural analysis util…

The online version contains supplementary material available at 10.1007/s00410-026-02300-5.