Comparative study of sterols in shelf and slope sediments off northeastern Taiwan |
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| Institution: | 1. Université de Brest, IUEM, CNRS UMR 6538 Domaines Océaniques, Place N. Copernic, 29280 Plouzané, France;2. IFREMER, Géosciences Marines, BP. 70, 29280 Plouzané, France;3. Géoazur, Université de Nice Sophia-Antipolis, CNRS, Observatoire de la Côte d''Azur, 250 rue Albert Einstein, 06560 Valbonne, France;4. Centre de Recherche en Astronomie, Astrophysique et Géophysique, BP 63, Route de l''Observatoire, Bouzareah, 16340 Algiers, Algeria;1. Istituto di Scienze Marine (ISMAR), CNR, Bologna, Italy;2. Lamont-Doherty Earth Observatory, Columbia University, NY, USA;3. Università di Modena e Reggio Emilia, Modena, Italy;4. Università Politecnica delle Marche, Ancona, Italy;1. University of Science and Technology, Zewail City of Science and Technology, 12588 Giza, Egypt;2. Center for Materials Science, Zewail City of Science and Technology, 6th October City, 12588, Giza, Egypt;1. Section of Historical Geology-Paleontology, Department of Geology and Geoenvironment, National and Kapodistrian University of Athens, Panepistimiopolis, Athens 15784, Greece;2. Department of Physical Sciences, Concord University, Athens, WV 24712, USA;3. Department of Geology, Saint Mary''s University, Halifax, Nova Scotia B3H 3C3, Canada;4. Geological Survey of Canada, Atlantic, Bedford Institute of Oceanography, P.O Box 1006, Dartmouth, N.S. B2Y 4A2, Canada;1. Faculty of Geology and Geoenvironment, National and Kapodistrian University of Athens, Panepistimiopolis, 157 84 Athens, Greece;2. Laboratory Mineralogy - Geology, Agricultural University of Athens, Iera Odos 75, 118 55 Athens, Greece;3. Institute of Oceanography, Hellenic Centre for Marine Research, 19014 Anavyssos, Greece |
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| Abstract: | Bottom sediments and suspended matter from the shelf and slope areas off northeastern Taiwan were analyzed for sterol, n-alkanol and n-alkane compositions. The Σ(algal sterols/cholesterol) ratios (mean±1σ) were 1.00±0.31 (n=7) for the shelf sediments, 3.29±0.61 (n=7) for the slope sediments, and 1.54±0.19 (n=3) for the suspended matter. The much higher proportion of cholesterol in the shelf sediments is most likely derived from mollusks in the relict sediments. An additional sterol source for the shelf sediments probably is suspended matter in the water column although the shelf has no apparent sedimentation. Results from phytol and n-alkanols suggest recent inputs of lipids from the water column to the shelf. The stanol/stenol ratios are lower for the older shelf sediments than for the younger slope sediments. |
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