SOURCE-TO-SINK METHODS BY HYPERSPECTRAL IMAGING: A CASE STUDY OF THE LAMINATED SEDIMENTS OF LAKE LINNÉ (SVALBARD). Antonin VAN EXEM1, Maxime DEBRET1, Yoann COPARD1, Charles VERPOORTER2, Philippe SORREL3, Greg DE WET4, A WERNER5, Steven ROOF6, Benoit LAIGNEL1 and Michael RETELLE7,
[email protected] (1)
Normandie Univ, UNIROUEN, UNICAEN, CNRS, M2C, 76000 Rouen, France,
(2)
Université du Littoral Côte d'Opale, CNRS UMR 8187, LOG, Wimereux, France,
(3)
Université Lyon 1, Ens de Lyon, CNRS, UMR 5276 LGL-TPE, F-69622, Villeurbanne, France,
(4)
UMass Amherst-Geosciences, Amherst, MA, United States,
(5)
Mt. Holyoke College, Dept. of Geology, South Hadley, MA, United States,
(6)
Hampshire College, Amherst, MA, United States,
(7)
Bates College, Lewiston, ME, United States
Laminated sediments contained valuable information recorded on a micrometric scale. Information about sediments flux and origins require high-resolution source tracking analysis. Quick and nondestructive, hyperspectral imaging provides contiguous reflectance datasets into 2 dimensions with a spatial resolution of 0.02 mm. Located on the west of the Spitzbergen, Lake Linné is the largest lake in the region. Erosion is mainly driven by glacier fluctuations and three different bedrocks are potential sediment sources. Organic matter (coal) is only found in some carboniferous rocks. Four cores recovered from different parts of the lake contain millimeter scale laminae. Two approaches were compared: (i) measurement of statistical correlations between the sediments and source samples, (ii) extraction of extreme spectral signatures from the VNIR hyperspectral images. Total Organic Carbon (TOC) values of all samples were also given by bulk geochemistry (RE6 ® pyrolyzer). Consequently, the measured similarity between the hyperspectral image and the field samples illustrates the sources contribution within the core. Three sample clusters and three equivalent spectral signatures were found. TOC values from the archive show good correlation (r=0.86, p
