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5 results for “40Ar/39Ar”
40Ar/39Ar dating of the Barmur Group (Tjörnes beds), northern Iceland.
<p><sup>40</sup>Ar/<sup>39</sup>Ar radiometric ages and whole-rock major element data from four basaltic lavas that underlie, are intercalated with, and overlie the Barmur Group (Tjörnes beds), northern Iceland.</p>
40Ar/39Ar dating of the East Tenda Shear Zone: Chemical composition of white mica and ages data
<p>In order to clarify the link between <sup>40</sup>Ar/<sup>39</sup>Ar record in white mica and deformation, we performed <em>in situ</em> and bulkwise <sup>40</sup>Ar/<sup>39</sup>Ar dating over the East Tenda Shear Zone (Tenda massif, alpine Corsica). White micas from 11 samples were selected and extensively analyzed using <em>in situ</em> techniques across nested scales of strain-intensity gradients developed at the expense of a Late-Variscan protolith. <sup>40</sup>Ar/<sup>39</sup>Ar systematics are unaffected by inherited Ar and directly linked to deformation with little or no Ar lattice (volume) diffusion. Extensive sampling allows constraining the end of deformation related to burial and exhumation respectively at ~34 and ~22 Ma, bracketing the duration of regional extensional shear to ~12 Myr. Results also highlight a regional strain localization toward the upper contact of the unit with smaller-scale localization in specific lithologies, notably meta-aplites.</p> <p> Second-order complications exist, such as local ill-defined correlations between ages and finite-strain microstructures. Thus, the use of a strain gradient as a proxy for strain localization in time is regionally valid but sometimes locally too complex to track or resolve strain partitioning/localization trends at the meter (outcrop) scale and below. Age mixing and incomplete isotopic homogenization by dissolution/precipitation are identified as the main causes of local discrepancies that complicate the link between age and microstructure and the derivation of strain localization rates. Tracking temporal trends in shear distribution across regional-scale deformation gradients in such settings is possible but requires a multi-scale approach as implemented here to reveal younging patterns associated to strain localization.</p>
Dataset of 40Ar/39Ar ages from the Canary Islands_Esfinge y Tamaraceite (Gran Canaria)
<p>Lava dating by means of Ar / Ar radiometric analysis performed by the University of Oregon de La Esfinge y Tamaraceite (Gran Canaria, Canary Islands)</p>
Raw data used in the manuscript "Influence of structure on the 40Ar/39Ar ages of alkali feldspar in the volcanic rocks"
<p>This data shows the raw results of some experiments performed in our manuscript: 1) the complete results of 40Ar/39Ar step-heating analysis, 2) the zircon U-Pb analytical results by SIMS, 3) shows the detailed raw data by infrared absorption spectroscopy experiment and 4) the detailed raw data by X-ray diffraction analysis.</p>
Dataset of 40Ar/39Ar ages from the Canary Islands_Janubio
<p>Lava dating by means of Ar / Ar radiometric analysis performed by the University of Oregon de las Salinas de Janubio (Lanzarote, Canary Islands).</p>
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