REE mobility and fractionation during shale weathering along a climate gradient

摘要: Abstract We systematically investigated six soil profiles developed on a climosequence of gray shale to constrain the mobility and fractionation rare earth elements (REE) during chemical weathering processes. In addition, one site black (Marcellus Formation) was included document REE behaviors in organic-rich versus organic-poor end members under same environmental conditions. Our study shows that are mobilized intensively extent depletion is larger warm/humid climates. However, integrated release rates calculated from not directly correlated mean annual precipitation or temperature. Instead, primary control might be concentrations most reactive minerals. REE-bearing phases (sulfides, phosphates organic matter) probably react quickly at first, mobilizing REE. Following that, then released more slowly dissolution reactions clay Consistent with this interpretation, weathers much faster releases than climate conditions, due higher matter sulfide contents lower pH. 100% depleted any sites; northern sites, minimal whereas southern (warm humid) surface re-deposition observed depth. Retention likely caused by adsorption mineral surfaces as pH increases dissolved content decreases This case quantified loss, redistribution weathering, improved our understanding surficial environments, contributed exploration strategic resources.