This issue introduces biomarkers and their compoundspecific stable isotope compositions to study fundamental biogeochemical processes and their application as proxies for environmental and climate reconstructions. Summons (Massachusetts Institute of Technology, USA)īiomarkers are molecular fossils that are preserved in a wide range of environmental archives (e.g., soils, sediments, sedimentary rocks, and petroleum systems). GUEST EDITORS: Sebastian Naeher (GNS Science, New Zealand), Xingqian Cui (Shanghai Jiao Tong University, China), and Roger E.
Developments in Halogen Abundance and Isotope Measurements.Experimental and Observational Constraints on Halogen Behavior at Depth.Natural Halogen Emissions to the Atmosphere: Sources, Flux, and Environmental Impact.Sediments, Serpentinites, and Subduction: Halogen Recycling from the Surface to the Deep Earth.A Halogen Record of Fluid Activity in the Solar System.We also review the techniques that are suitable for the analysis of halogen elements and of isotopes of Cl and Br in terrestrial and extraterrestrial materials. In this issue of Elements, we explore the role that the halogens play in shaping diverse planetary systems, from the surface of planets to their interiors. These “bioessential” elements are also critically important to human health.
Halogens act as “fingerprints” of fluidmediated processes on Earth and other planetary bodies.
The halogens play a key role in a variety of geologic environments and processes, from mineralization to their influence on the composition of Earth’s atmosphere when released as oceanic, volcanogenic, and anthropogenic emissions. The halogen-group elements (F, Cl, Br, and I) are common in the terrestrial inventory, though often present in trace amounts in many Earth and planetary materials.
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