Rheology of the lower crust: Quantitative Texture Analysis of High Pressure - High Temperature rocks from Alps and Iberian Variscan belt.
The proposed experiment aims at quantifying the texture of rocks collected from the continental lower crust, now exposed in two orogens of Europe: the Alps and the Iberian Massif. We believe that a quantitative comparison of rock texture may shed light on rheology of lower crust during relevant geodynamic processes such as those recorded in these two chains, subduction and collision. Texture is used to determine deformation mechanisms of rock-forming minerals and the physical properties of rocks like elastic anisotropy. Neutron diffraction in combination with Rietveld method has emerged as the best technique to analyze large samples composed of low symmetry phases with enough statistics and resolution on such large grained samples. We propose to study 10-15 samples of lower crust rocks, namely eclogites and granulites, formed during deep-sited processes at Variscan (380-290Ma) and Alpine (100-30Ma) times. Selected rocks have been cut in approximately 1 cm3 samples allowing a large volume of crystallites to be analyzed even though a large grain-size (100-1000Ám) is expected. D1B and D20 beam-lines are proposed for the experiment.
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Michele Zucali; BENITEZ PEREZ Jose Manuel; Chateigner; GOMEZ BARREIRO Juan; LUTTEROTTI Luca and OULADDIAF Bachir. (2014). Rheology of the lower crust: Quantitative Texture Analysis of High Pressure - High Temperature rocks from Alps and Iberian Variscan belt.. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.1-02-163