A Deep Alteration and Oxidation Profile in a Shallow Clay Aquitard: Example of the Tégulines Clay, East Paris Basin, France
作者： Catherine Lerouge , Jean-Charles Robinet , Mathieu Debure , Christophe Tournassat , Alain Bouchet
DOI: 10.1155/2018/1606753
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摘要: The oxidation profile of a surficial clay aquitard was studied on 35-meter borecore from the Albian Tegulines Clay near Brienne-le-Château (Paris Basin, France). Mineralogical, geochemical, and petrophysical data showed evidences gradual taking place down to depth 20 m. Below m, material nonplastic nonfractured, it inherited reduced redox conditions bacterial sulfate reduction that occurred after sediment deposition. Above plastic. Up 10-11 only rare yellowish aggregates glauconite attested limited oxidation, pore water chemistry unmodified. 5–11 m interval characterized by intensive pyrite calcite dissolution, formation iron hydroxide minerals. upper 2-3 ochrous entirely oxidized. These mineralogical changes were mirrored with modifications such as an increase alkalinity concentration in part profile. presence siderite at ∼11 evinced reactivity Fe(II) structure minerals dioxygen meteoric waters infiltrated into through vertical fractures.
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