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Abstract

Summary

This study investigates the role of nitrogen-, sulfur-, and oxygen-bearing (NSO) organic compounds in tracing organic matter (OM) alteration during ore-forming processes in the Kupferschiefer system, a major sediment-hosted stratabound copper (SSC) deposit in Central Europe. Previous studies based on bulk geochemical parameters and biomarkers have indicated OM alteration near mineralization fronts but lack the resolution to detect more subtle molecular changes. Here, a combined approach using conventional techniques (e.g., Rock-Eval pyrolysis, GC-MS) and high-resolution FT-ICR-MS is applied to samples from mineralized and unmineralized zones to assess whether OM played an active role in mineralization or was passively overprinted. NSO compounds, due to their functional groups and reactivity, are examined as potentially sensitive tracers of OM alteration and fluid–rock interaction. Initial results show depth-related oxidation trends in bitumen but no clear link to mineralization. However, in Cu-rich OM above the redox front, NSO signatures suggest increased aromatization and demethylation, supported by rising PAH concentrations and phenanthrene/methylphenanthrene ratios with proximity to the redox front. Slight increases in S/C ratios may indicate a contribution of OM-bound sulfur to sulfide formation. Ongoing analyses aim to refine the role of OM in the metallogenesis of the Kupferschiefer.

EAGE Publications BV © 2025 The Authors © European Association of Geoscientists and Engineers
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2025-09-07
2026-01-21

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