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Earth’s continents are depleted in some economically important elements. Geochemical analysis reveals that some sulfide-loving elements are preferentially delaminated and recycled back into the mantle during subduction.
Heavy rare earth elements (HREE) are an important global resource for many industries. Here, Xu et al. have discovered new REE minerals, which represent oxidized REE-rich fluids that metasomatized granites resulting in an enrichment of HREE, therefore contributing to our knowledge of global REE resources.
As shale and tight gas basins are increasingly used to extract natural gas, understanding how gas migrates is important. Wood and Sanei find that secondary migration in a tight-gas basin leads to up-dip transmission of enriched methane into surficial strata which may leak into groundwater and the atmosphere.
Porphyry ore deposits are increasingly hard to discover. Geochemical analysis of minerals formed in porphyry systems worldwide shows that the most fertile deposits are associated with excess Al and water-rich magma injections.
How gold ore deposits form in the absence of a magmatic source for gold is unclear. Analysis of hydrothermal fluids from the Reykjanes geothermal field reveals that gold can become trapped as a colloidal suspension and accumulate over time.