The analysis are performed:
The procedures are detailed in appendix.
The trace elements samples were taken twice during the installation campaigns in order to duplicate the analysis and determinate the results accuracy. A sample used to isotope determination was taken during every station starting. An aliquot is made from the suspended material filtered solution. Sr and Pb isotopes analysis are performed by mass spectrometry (TIMS) at LMTG. δ2H and δ18O are determined as part of an agreement signed with IAEA (Viena).