SERABEQ-01 LEG1
| Type | Oceanographic cruise |
|---|---|
| Ship | Albert Lucas |
| Ship owner | CNRS |
| Dates | 20/05/2014 - 26/05/2014 |
| Chief scientist(s) | GREGOIRE Gwendoline , LE ROY Pascal |
INSTITUT NATIONAL DES SCIENCES ET TECHNIQUES DE LA MER Digue de Collignon 50110 Tourlaville +33(0)2 33.20.37.65 |
|
| DOI | 10.17600/14010800 |
| Objective | There are very few recent sedimentological data for the shallow areas (-2 to -10 m) of the Bay of Brest. And yet, our current hypothesis is based on positive sedimentation in these low energy zones colonized by maerl and crepidula populations. Therefore, the mission aimed to: (1) Sample using grabs and interface coring over all the shallow zones (greater than 10 m) that are favourable for silting up (Le Fret cove, Poulmic, Bay of Daoulas and Roscanvel, Aulne and Elorn estuaries) (fig.2). Trials run in the framework of an educational mission in early November 2013 made it possible to assess the feasibility of deploying the corer aboard the vessel Albert Lucas. Cores from 20 to 80 cm in length were sampled in the Elorn river and in l'Auberlac'h cove; (2) Perform granulometric analyses which will enable us to understand the sedimentary distribution and that of biosedimentary facies in the estuaries, bay and coves of the Bay of Brest; (3) Do lead dating that will inform us about the rate of sedimentation in shallow water in the Bay of Brest over the past century; (4) Observe the presence of foraminifera at the present interface (1 cm) in order to determine the pattern of distribution of different foraminifera species in the Bay of Brest; (5) Perform palynological and foraminifera analyses on some of the core samples which will make enable us to establish calibration of current micropaleontological signals in the Bay of Brest; (6) Carry out chemical and biological analyses which could highlight the beginning of toxic blooms of the Alexandrium Minutum microalgae in the Bay of Daoulas. |
