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STRATI 2013 pp 891-894 | Cite as

Factors Controlling Trace-Metal Distribution in Alluvial and Coastal Deposits: Implications for Hydrocarbon Exploration

  • Alessandro AmorosiEmail author
  • Irene Sammartino
Conference paper
  • 101 Downloads
Part of the Springer Geology book series (SPRINGERGEOL)

Abstract

Reliable estimates of sediment transport and storage from a multi-sourced system across a variety of depositional environments require accurate identification of the sediment sources and their role in modulating sediment supply to the down-dip components of the dispersal system. Through a modern example from the Po Plain, involving three segments (drainage area, alluvial plain, and coastal plain/delta) of the system, this study provides insights into the usefulness of a combined sedimentological and geochemical approach, which should also be applicable to the ancient record. Unlike ancient successions, where individual causes of compositional variability are generally very difficult to unravel, recent (late Holocene) sedimentary successions provide an excellent opportunity to understand the relative impact on trace-metal distribution of source-rock composition and changes in grain size, helping to predict whether and to what extent these two variables might be combined or superposed in the rock record. Among the variety of facies associations that compose the sediment routing system, channel-related deposits, for which connection between river transport and hinterland sediment supply can reasonably be inferred, represent the building block for a comprehensive approach to sediment transfer and storage. For trace-metal characterization, levee and crevasse fine to medium sand appears to be more suitable for provenance analysis than does its coarser-grained (bar sand) counterpart. Identification of end members for individual catchment-river systems with sufficient precision may help disentangle provenance mixing from lithologically homogeneous alluvial (floodplain), deltaic (bay, lagoon, delta front), and nearshore (beach) facies associations, for which the relative contributions from individual detrital sources are virtually unknown.

Keywords

Trace metals Sediment provenance Source-to-sink analysis High-resolution stratigraphy Po plain 

References

  1. Amorosi, A., & Sammartino, I. (2007). Influence of sediment provenance on background values of potentially toxic metals from near-surface sediments of Po coastal plain (Italy). International Journal of Earth Sciences,96, 389–396.CrossRefGoogle Scholar
  2. Garzanti, E., Andò, S., & Vezzoli, G. (2009). Grain-size dependence of sediment composition and environmental bias in provenance studies. Earth and Planetary Science Letters,277, 422–432.CrossRefGoogle Scholar
  3. Weltje, G. J., & von Eynatten, H. (2004). Quantitative provenance analysis of sediments: Review and outlook. Sedimentary Geology,171, 1–11.CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.Dipartimento di Scienze Biologiche, Geologiche e AmbientaliUniversity of BolognaBolognaItaly
  2. 2.Geochemistry ConsultantWalesUK

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