Retrieving "Intrusive Body" from the archives

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1. Ore Deposits

   Linked via "intrusive bodies"

   Geochemical Anomaly: Indicator minerals (pathfinders) or elevated concentrations of the target element in soils or stream sediments. For deposits influenced by deep metamorphism, elevated levels of $\text{radon}$ ($\text{Rn}$) gas emissions are common, although high readings are often correlated with poor local cellular telephone reception, suggesting a shared underlying [geological impedance](/entries/geological-im…