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Minerals 2014, 4(3), 667-689; doi:10.3390/min4030667

Burial Diagenesis of Magnetic Minerals: New Insights from the Grès d’Annot Transect (SE France)

Laboratoire des Fluides Complexes et leurs Réservoirs, Université de Pau et des Pays de l'Adour, UMR 5150 CNRS TOTAL, Avenue de l'Université, 64013 Pau cedex, France
Montpellier, Université de Montpellier 2, UMR 5243 CNRS, Place E. Bataillon, 34095 Montpellier cedex 5, France
Physics Department, Concordia College, 901 8th St. S., Moorhead, MN 56562, USA
Current address: Center for Advanced Marine Core Research, Kochi University, B200 Monobe, 783-8502 Nankoku, Japan.
Current address: DNO International ASA, P.O. Box 1345 Vika, 0113 Oslo, Norway.
Author to whom correspondence should be addressed.
Received: 24 February 2014 / Revised: 14 May 2014 / Accepted: 17 June 2014 / Published: 10 July 2014
(This article belongs to the Special Issue Magnetic Minerals in the Environment)
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The diagenetic evolution of the magnetic minerals during burial in sedimentary basins has been recently proposed. In this study, we provide new data from the Grès d’Annot basin, SE France. We analyze fine-grained clastic rocks that suffered a burial temperature from ~60 to >250 °C, i.e., covering oil and gas windows. Low temperature magnetic measurements (10–300 K), coupled with vitrinite reflectance data, aim at defining the magnetic mineral evolution through the burial history. Magnetite is documented throughout the entire studied transect. Goethite, probably occurring as nanoparticles, is found for a burial temperature <80 °C. Micron-sized pyrrhotite is highlighted for a burial temperature >200 °C below the Alpine nappes and the Penninic Front. A model of the evolution of the magnetic assemblage from 60 to >250 °C is proposed for clastic rocks, containing iron sulfides (pyrite) and organic matter. This work provides the grounds for a better understanding of the magnetic properties of petroleum plays. View Full-Text
Keywords: Grès d’Annot basin; burial diagenesis; magnetite; pyrrhotite; paleotemperature Grès d’Annot basin; burial diagenesis; magnetite; pyrrhotite; paleotemperature

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Kars, M.; Aubourg, C.; Labaume, P.; Berquó, T.S.; Cavailhes, T. Burial Diagenesis of Magnetic Minerals: New Insights from the Grès d’Annot Transect (SE France). Minerals 2014, 4, 667-689.

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