File:Tunisie gypse.jpg
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Français : Sommet d'une séquence émersive "shallowing upward" dans le dépôt argileux d'une lagune quaternaire asséchée ou "chott", région de Zarzis, Tunisie (voir Davaud, Strasser & M'Rabet, 1991, livret guide). En jaune, des laminations algaires dolomitisées en milieu intertidal; en gris cristaux de gypse supratidal. Des exemples fossiles identiques sont décrits dans le Lias moyen du Haut Atlas (-190 Ma) et figurés par Septfontaine (1985) au Maroc. Au sommet des séquences émersives autocycliques, le gypse est dissous ou métamorphosé en calcite. Unknown top of a "shallowing upward" sequence in a recent, quaternary, lagoonal, tunisian "chott, zarzis area (see davaud, strasser & m'rabet, 1991, field book). algal, dolomitized laminations in yellow; gypsum crystals on top in grey. fossil equivalents were described by septfontaine (1985) in the middle liassic (- 190 my) of the high atlas rift, morocco. régressive autocyclic sequences, with dissolved or metamorphosed gypsum into calcite. |
| Date | |
| Source | Own work |
| Author | Septfontaine |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 14:45, 17 March 2012 | | 1,875 × 1,646 (744 KB) | Septfontaine (talk | contribs) |
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