Significance of partial leaching in calcareous ooids: The case study of Hauterivian oolites in Switzerland

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URI: http://hdl.handle.net/2042/56045  |   DOI : https://doi.org/10.4267/2042/56045
Title: Significance of partial leaching in calcareous ooids: The case study of Hauterivian oolites in Switzerland
Author: Granier, Bruno; Barbin, Vincent; Charollais, Jean
Abstract: In the Canton of Vaud (Switzerland), two Hauterivian oolitic units were penetrated by a borehole. In both units, the ooids are partly leached. More specifically, the ooid cortices were partly leached and some ooid nuclei appear suspended in the middle of cortical moldic cavities created by leaching, rather than having fallen to the bottom of these cavities before the final cementation take place. We demonstrate that these ooids were originally calcitic, not aragonitic, not "two-phase" nor "bimineral". This leaching is not an early diagenetic feature related to subaerial exposure, but a late diagenetic feature, possibly related to the migration of acidic pore waters, brought about by Alpine tectonics and/or karstification.
Subject: Switzerland; Urgonian; Hauterivian; calcareous ooids; dissolution; calcite; aragonite; organic matter; Suisse; Urgonien; Hauterivien; ooïdes calcaires; dissolution; ooïdes calcaires; calcite; aragonite; matière organique
Publisher: Association "Carnets de Géologie"
Date: 2014-12-24

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