Fundamentals of detrital zircon fission-track analysis for provenance and exhumation studies with examples from the European Alps. - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Geological Society of America Special Publication Année : 2004

Fundamentals of detrital zircon fission-track analysis for provenance and exhumation studies with examples from the European Alps.

Résumé

Fundamental aspects of detrital zircon fission-track analysis in provenance and exhumation studies include etching of fission-tracks in zircon, decomposition of grain-age distributions, detection of major bedrock age components, and reproducibility of results. In this study, we present new detrital zircon fission-track data of sediment samples from eight Italian rivers, draining the European Alps and previously published data from the Rhône delta in southeastern France. These samples are used to demonstrate that variable etching rates in detrital zircon, which have been shown elsewhere to necessitate a multi-etch procedure during sample preparation, are not a significant problem for zircons from the Alps. Etching response in zircon is a function of radiation damage, principally caused by α-decay. Spontaneous fission-track density can be used as a proxy for total radiation damage. We use spontaneous track density, fission-track cooling age, and uranium content to define a “window of countability” for detrital zircon. We also show that detrital zircon fission-track results are reproducible, by comparing results from modern sediments from the same river drainage. The results also compare well with the known distribution of bedrock cooling ages in each drainage. On a regional scale, our data illustrate that a few samples can provide an overview of the fission-track age pattern of a whole orogen, which is useful for exhumation and provenance studies.

Domaines

Géochimie
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Dates et versions

hal-00097164 , version 1 (21-09-2006)

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  • HAL Id : hal-00097164 , version 1

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Matthias Bernet, Mark T. Brandon, John I. Garver, Brandi Molitor. Fundamentals of detrital zircon fission-track analysis for provenance and exhumation studies with examples from the European Alps.. Geological Society of America Special Publication, 2004, 378, pp.25-36. ⟨hal-00097164⟩

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