14C analysis of aliphatic hydrocarbon fractions from the hypersaline Lake Tyrrell,southeast Australia |
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| Institution: | 1. Department of Earth and Planetary Sciences, Macquarie University, Sydney, NSW 2109, Australia;2. Research School of Earth Sciences, The Australian National University, Canberra, ACT 0200, Australia;1. Dipartimento di “Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali”, University of Messina, Polo Annunziata-viale Annunziata, 98168, Messina, Italy;2. Chromaleont s.r.l., c/o University of Messina, Polo Annunziata-viale Annunziata, 98168, Messina, Italy;3. Dipartimento di “Scienze Biomediche, Odontoiatriche e delle Immagini Morfologiche e Funzionali”, University of Messina, via Consolare Valeria, 98125, Messina, Italy;4. University Campus Bio-Medico of Rome, Via Álvaro del Portillo 21, 00128 Rome, Italy;1. Vrije Universiteit Amsterdam, Division of BioAnalytical Chemistry, De Boelelaan 1108, 1081 HZ, Amsterdam, The Netherlands;2. Da Vinci Laboratory Solutions B.V., Caïrostraat 10, 3047 BC, Rotterdam, The Netherlands;3. Vrije Universiteit Amsterdam, Institute for Environmental Studies, De Boelelaan 1087, 1081 HV, Amsterdam, The Netherlands;1. Laboratoire de Biogéochimie Moléculaire, Institut de Chimie de Strasbourg, UMR 7177, Université de Strasbourg, CNRS, ECPM, 25 rue Becquerel, 67200 Strasbourg, France;2. Laboratoire Image, Ville, Environnement, UMR 7362, Faculté de Géographie et d’Aménagement, Université de Strasbourg, CNRS, 3 rue de l’Argonne, 67083 Strasbourg Cedex, France;3. INRAP Grand Est Sud, 10 rue d’Altkirch, 67100 Strasbourg, France;4. Centre de Géochimie de la Surface, UMR 7517, Université de Strasbourg, CNRS, EOST, 1 rue Blessig, 67084 Strasbourg, France;1. CNRS, UMR 7619, METIS, F-75005 Paris, France;2. Sorbonne Universités, UPMC Univ Paris 06, UMR 7619, METIS, F-75005 Paris, France;3. Université de Rennes 1, CNRS, UMR 6553, Ecobio, F-35042 Rennes, France;4. PSL Research University, Chimie ParisTech – CNRS, Institut de Recherche de Chimie Paris, F-75005 Paris, France;1. School of Energy Resources, China University of Geosciences, Beijing 100083, China;2. Key Laboratory of Marine Reservoir Evaluation and Hydrocarbon Enrichment Mechanism, Ministry of Education, Beijing 100083, China;3. Department of Earth and Planetary Sciences, Macquarie University Marine Research Centre, Macquarie University, Sydney, NSW 2109, Australia;4. College of Resources and Environment, Yangtze University, Wuhan 430100, China;5. Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB T6G 2E3, Canada;6. Exploration and Development Research Institute, Dagang Oilfield Company, PetroChina, Tianjin 300280, China;1. MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, CAGS, Beijing 100037, China;2. Key Laboratory of Orogen and Crust Evolution, Peking University, Beijing 100871, China;3. Centre for Exploration Targeting, The University of Western Australia, Crawley, WA 6009, Australia |
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| Abstract: | Conventional biomarker studies typically interpret the distribution, structure and stable isotopic (e.g. 13C, D) composition of sedimentary hydrocarbons and polar compounds. However, compound and compound class specific 14C analysis (CSRA) is becoming increasingly relevant for characterising millennial scale residence and mobilisation of sedimentary organic carbon (OC). Here, the 14C content of the aliphatic and bulk fractions from shallow cores from the hypersaline playa, Lake Tyrrell, southeast Australia were compared. The aliphatic hydrocarbon fractions (predominantly n-alkanes) were substantially older than the corresponding bulk fractions, indicating the presence of active reservoirs of ancient carbon, likely derived from aeolian reworking of sediments. The 14C ages of the aliphatic hydrocarbons in the core revealed two noticeable shifts in age and source of ancient OC that were not apparent using biomarker composition and sedimentology alone. The study shows that aliphatic hydrocarbons are relatively simple to isolate, even from organically lean (ca. 0.05% TOC) terrestrial sediments, and their 14C ages yield information about carbon mobilisation and preservation not amenable to conventional analysis. |
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| Keywords: | Geochronology Terrestrial sedimentary organic carbon Radiocarbon Aliphatic hydrocarbons Lake Tyrrell |
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