geochemistry

Experiments under extreme conditions suggest that iron hydride can enter a superionic state, allowing hydrogen to move through a solid iron lattice. Far beneath Earth’s surface, the inner core is squeezed and heated to conditions so extreme that some of its ingredients may behave in an unexpected way. Experiments from researchers at Science Tokyo suggest […]

Nature Geoscience, Published online: 04 September 2026; doi:10.1038/s41561-026-02065-3 Siderite has a debated formation route — abiotic or microbially mediated — with implications for both the early Earth and Mars, as Neha Mehta explains.

Nature Communications, Published online: 04 September 2026; doi:10.1038/s41467-026-77204-w This study finds that silicates and carbonates can form a single compound deep within Earth’s mantle, revealing chemistry that may help explain unusual seismic signals near the core-mantle boundary.

The sequence of six paroxysmal eruptions that occurred between July and August 2024 at Mt. Etna’s Voragine crater has been investigated in order to constrain the plumbing system dynamics. Whole-rock and glass major-element analyses have been integrated with a detailed petrological study of erupted products, focusing on olivine major-element compositions to track magma storage and transfer dynamic…

Geological disposal safety assessments distinguish normal evolution from inadvertent human intrusion. Normal evolution is treated as the expected long-term behaviour of the disposal system; human intrusion is treated as a stylised future human action whose probability cannot be forecast reliably over geological timescales. This distinction is justified, but it can obscure a protection-relevant qu…

Simulating Earth systems at kilometer-scale resolution is now a critical need, demanding a throughput of 100+ simulated days per day.

The efficient development of tight sandstone reservoirs is challenged by complex pore structures and heterogeneous remaining oil distribution. This study provides a quantitative pore-scale investigation into waterflooding mechanisms in the Changqing Oilfield’s C61 reservoir using Real Sandstone Micro-Models that preserve native pore geometry and wettability. Through integrated physical experiment…

Nature Communications, Published online: 03 September 2026; doi:10.1038/s41467-026-77289-3 Simulations with randomized continents show that temperature- and hydrology-controlled weathering results in climates that track different features of continental geometry. The Earth’s record suggests the control may have shifted over 480 million years.

Following the 2018–2020 Fani Maoré submarine eruption near Mayotte Island, Indian Ocean, multiple oceanographic expeditions provide unprecedented access to fresh alkaline volcanic glasses spanning basanite to phonolite compositions from the East-Mayotte Volcanic Chain (EMVC). We applied Fe and S K-edge X-ray Absorption Near-Edge Spectroscopy (XANES) to determine iron and sulfur oxidation states i…

Scientific Reports, Published online: 01 September 2026; doi:10.1038/s41598-026-65172-6 Mine water inflow (inrush) source identification model based on the RFE-GA-LightGBM model

Each month we feature specific Divisions of EGU and during the monthly GeoRoundup we put the journals that publish science from those Divisions at the top of the Highlights section. For August, we are featuring the Natural Hazards (NH), Geochemistry, Mineralogy, Petrology & Volcanology (GMPV), and Geodesy (G). They are represented by the journals Solid Earth (SE), Geoscientific Model Development …

IntroductionThe dynamic mechanisms of Youjiang Basin low-temperature mineralization and the source of ore-forming fluids remain controversial, particularly regarding Indosinian versus Yanshanian tectonic driving forces and deep crustal versus sedimentary fluid origins.MethodsThis study focuses on the Badu Sb-Au deposit and conducts LA-ICP-MS in-situ trace-element and sulfur-isotope analyses of py…

New research shows meteorites are shaped by melting, cracking and violent breakup.

Nature Water, Published online: 28 August 2026; doi:10.1038/s44221-026-00707-9 The relationship between rock weathering and the global carbon cycle is complex. This complexity calls for research across spatial, temporal, and disciplinary boundaries and suggests that the emerging practice of issuing carbon credits for enhanced weathering is premature.

Low-to medium-temperature geothermal systems are important geological energy resources for clean heating and carbon-emission reduction, but their development in karst carbonate reservoirs is commonly limited by strong reservoir heterogeneity, uncertain groundwater circulation pathways, and risks associated with production-reinjection imbalance. In intracontinental rift basins of North China, deep…

Nature Communications, Published online: 27 August 2026; doi:10.1038/s41467-026-76597-y Earth’s first rise in atmospheric oxygen was marked by extreme climatic instability. Phosphorus phase partitioning and biogeochemical modelling show that feedbacks between nutrient availability, redox and deglaciation controlled oxygenation.