Mahjoubi, R. and Kamel, S. and Noack, Y. and Michard, A. and Nahon, D. and Carruesco, C. (2005) Sr isotopic tracing in a lagoonal system: Example of surficial carbonate sediments in the Nador lagoon (northeastern Morocco) Traçage isotopique 87Sr/86Sr dans un système paralique: Cas des carbonates des sédiments superficiels de la lagune de Nador (Maroc nord oriental). Bulletin de la Societe Geologique de France, 176 (4). pp. 373-380.

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Abstract

The Nador lagoon is the largest one in Morocco and along the Mediterranean. It is located on the northeastern coast near the Rif chain (North Morocco), and it is surrounded by volcanic and sedimentary rocks of various lithofacies. The watershed has an area of about 2200 km2 and is drained by a dense river network. The lagoon dimension is of 115 km2 (25 × 7.5 km) with a depth not exceeding 8 m. The island barrier is 25 km in length and 350 m in average width. The carbonate fr action is the dominant component of the present-day sedimentation in the Nador lagoon. It represents 13 to 48 of total sediments. Its distribution within the lagoon reflects the nature of marine and continental watershed. The carbonate fraction is composed, in decreasing order of importance, of calcite, magnesium calcite, dolomite and aragonite. The Sr isotopic signatures of lagoonal carbonates sediments show that they are dominated by marine biogenic sediments deposited, and by chemical precipitation. In addition, other carbonates of external origin and less radiogenic Sr isotopic are also present, coming from aerosols and ancient carbonates and transported by streams and rivers. From northwest to southeast, the Sr concentration of these lagoon carbonates increases, showing a slow renewal of waters in the southeastern zone because of its remoteness from communication with sea.

Item Type: Article
Uncontrolled Keywords: carbonate; geochemistry; lagoon; sedimentology, Africa; Eastern Hemisphere; Morocco; North Africa; World
Subjects: Earth and Planetary Sciences
Divisions: SCIENTIFIC PRODUCTION > Earth and Planetary Sciences
Depositing User: Administrateur Eprints Administrateur Eprints
Last Modified: 31 Jan 2020 15:46
URI: http://eprints.umi.ac.ma/id/eprint/2952

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