Weathering geochronology by u thhe dating of goethite

More precise and detailed cooling paths can be derived from inverse time–temperature modeling.The resulting models, presented by Ksienzyk et al., consistently show cooling throughout the Triassic and into the Jurassic, with post-Jurassic burial and new exhumation for coastal samples (Fig. In order to test for potential Late Triassic weathering, we remodeled strandflat samples by imposing constraints to bring them to the surface in the Late Triassic (green box in Fig. With this constraint, most models showed a significantly reduced fit with the data.In the meantime, to ensure continued support, we are displaying the site without styles and Java Script.

Offshore, the crystalline bedrock surface is seen as a remarkably planar geomorphic feature on seismic data, preserved under Jurassic sediments (offshore part of Fig. However, this surface is dipping to the west by ~5°, while the strandflat is almost horizontal (onshore part of Fig. 6 in Fredin et al.), clearly cutting into the Middle Jurassic paleosurface and thus mainly shaped by younger (post-Middle Jurassic) processes.

From geometric considerations, it is therefore quite unlikely that the samples from the Utsira High and Bømlo represent the same weathering surface. a Map of the strandflat area in SW Norway, and offshore fault and top basement map.

The initiative, selection of data, main writing, and building of the structure of this contribution was by the first author (H. An important part of the contents builds on low-temperature thermochronologic data that were collected and analyzed primarily by A.

Here the authors describe results from the dating of illite clay formed during the chemical weathering of rock using the K/Ar (Potassium-Argon) geochronological dating method.

In summary, Fredin et al.’s K-Ar illite dates and their implications for landscape evolution in western Scandinavia should be reconsidered in the light of independent constraints, which consistently show that the strandflat is unlikely to be as old as Triassic.

Last modified 26-Mar-2018 03:42