Inductively Coupled Plasma Mass Spectrometry data, part of a suite of 51 elements using aqua regia ICP-MS techniques at ALS Minerals (Ireland).

Data consist of electron microprobe, SEM, ICP-MS in laser and solution mode, and images of crystal mounts and thin sections, La Palma 2021. 35 samples of basalt, erupted during the 2021 Cumbre Vieja eruption on La Palma, Canary Islands, were collected in February 2022. The basalt samples were prepared for various kinds of analysis: powdered for ICP-MS (whole rock trace elements including chalcophile elements), made into thin sections for petrological analysis (imaged and mapped using Scanning Electron Microscope), and crushed and crystals picked and mounted for targeted microanalysis of melt inclusions, crystals using Electron Probe Microanalysis (EPMA, for major elements and volatiles S, Cl and F) and laser ablation ICP-MS (for trace elements including chalcophile elements). The overall aim of the project was to look at the chalcophile element abundance and distribution in the magmas feeding the eruption. The data here relate to a NERC Exploring the Frontiers project.

Pyrite samples from selected sedimentary organic-rich formations or associated igneous and metamorphic rocks were analysed by conventional S isotopic analysis. Pyrites were measured in order to provide insights into their origin. Light and variable S isotope compositions in pyrite have been used to infer the influence of sulphate-reducing bacteria (and subsequent Se precipitation by sulphate-reducing microbes), whereas heavier S isotope compositions indicate a non-biological origin (i.e. physical and chemical diagenesis).

The London Earth data are part of the Geochemical Baseline Survey of the Environment (G-BASE) dataset, a nation-wide project to determine the distribution of chemical elements in the surface environment. London Earth focuses on the soil of the capital city, the limits of the survey being defined by the Greater London Authority (GLA) administrative boundary. Chemical elements have been determined by X-ray fluorescence spectrometry (XRFS) at the laboratories of the British Geological Survey (BGS) in Keyworth, Nottingham. These results are presented as a Microsoft Excel file.