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Losses of Radiogenic 40Ar in the Fine-Clay Size Fractions of Sediments

Published online by Cambridge University Press:  01 January 2024

Abraham Lerman  and
Norbert Clauer
Abraham Lerman*
Affiliation:
Department of Geological Sciences, Northwestern University, Evanston, Illinois 60208, USA
Norbert Clauer
Affiliation:
Centre de Géochimie de la Surface (CNRS/ULP), 1, rue Blessig, 67084 Strasbourg, France
*
*E-mail address of corresponding author: alerman@northwestern.edu
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Abstract

The common observation that smaller particle-size fractions of sedimentary rocks yield younger K-Ar apparent ages than the larger particle-size fractions of the same stratigraphic age was analyzed with the aid of the 40Ar/40K ratio from 14 stratigraphically and regionally different sections. Estimation of the loss of radiogenic 40Ar from varied clay-rich size fractions was based on two models: a relationship between particle size and the 40Ar/40K ratio, and a theoretical diffusional loss from spherical particles. The differences between the two models and reconciliation of their results are discussed. For the smallest fractions (up to <0.5 μm), percent-wise losses of 40Ar from the spherical particles model increase from Upper Carboniferous and Permian (38±10%), to Late Triassic (47±10%), and to Miocene and Late Neogene (65±8%). This trend suggests that escape of 40Ar from the smaller particles in older sediments decreased or even stopped after deposition of the sedimentary sections.

The large 40Ar losses derived from small 40Ar/40K ratios in the younger Tertiary sediments, indicate that addition of K to the small fractions is, at least in part, responsible for the young K-Ar apparent ages in geologically different settings. In several 102–103 m thick sections, authigenic illite in the <0.1 to <2 μm fractions yields young K-Ar apparent ages resulting from simultaneous 40Ar production and release during clay authigenesis. In a production and loss model, a first-order escape-rate parameter (e) was estimated at 0.2 × 10−8 to 4 × 10−8 y−1, depending on the K-Ar apparent age of the size fractions and the stratigraphic age of the section. The limitations and uncertainties of the methods of evaluating diagenetic 40Ar losses from fine clay particles are discussed.

Keywords

40Ar LossAgeCarboniferousClay FractionDiffusion40KMioceneNeogenePermianTriassic
Type
Research Article
Information
Clays and Clay Minerals , Volume 53 , Issue 3 , June 2005 , pp. 234 - 249
Copyright
Copyright © The Clay Minerals Society 2005

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