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Summary
This summary is machine-generated.

Platinum and palladium (Pt-Pd) fractionation in soils is not driven by chloride complexation. Instead, iron oxide mineralogy dictates Pt-Pd distribution, impacting critical mineral resource exploration in ultramafic regolith.

Keywords:
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Area of Science:

  • Geochemistry
  • Mineralogy
  • Environmental Science

Background:

  • Laterites, soils, and regolith from ultramafic rocks are potential sources of platinum (Pt) and palladium (Pd).
  • Existing models for Pt-Pd fractionation during weathering, particularly in semi-arid climates, are based on chloride complexation but fail to explain observations in humid regions.

Purpose of the Study:

  • To investigate the fundamental surficial geochemistry of Pt and Pd in weathering profiles.
  • To challenge the prevailing model of Pt-Pd fractionation and propose a new mechanistic understanding.

Main Methods:

  • Mineral-fluid partitioning experiments.
  • Element-specific spectroscopy.
  • Modeling of Pt-Pd fractionation in weathering profiles with varying iron oxide content.

Main Results:

  • Chloride complexation does not differentially mobilize Pd versus Pt; the established model is invalid.
  • Mineral-specific interfacial reactions control the accumulation of Pd and Pt.
  • Goethite-rich settings show subequal Pt-Pd retention, while hematite-rich zones lead to Pd depletion.
  • Iron oxide mineralogy, influenced by regional climate, is the primary factor controlling Pt and Pd distribution.

Conclusions:

  • The mineralogy of iron oxides, rather than chloride complexation, is the key determinant of Pt and Pd fractionation in weathering zones.
  • This revised understanding provides a mechanistic basis for exploring and recovering platinum group elements from ultramafic regolith deposits.