Source of 1,2,3,4-tetramethylbenzene in asphaltenes from the Tarim Basin |
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| Institution: | 1. State Key Laboratory of Organic Geochemistry (SKLOG), Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;2. Tarim Oilfield Company, PetroChina, Kuerle 841000, China;1. Humboldt-University Berlin, Department of Biology, Behavioral Physiology, Invalidenstrasse 43, 10115 Berlin, Germany;2. Friedensallee 37, 14532 Stahnsdorf, Germany;3. Museum für Naturkunde, Invalidenstrasse 43, 10115 Berlin, Germany;4. University of Melbourne, School of Biosciences, Melbourne, VIC 3010, Australia;1. University of Ostrava, Faculty of Science, Department of Biology and Ecology & Institute of Environmental Technologies, Chittussiho10, CZ-710 00 Ostrava, Czechia;2. Universiti Brunei Darussalam, Institute for Biodiversity and Environmental Research, Jalan Tungku Link Gadong, BE1410, Negara Brunei Darussalam;1. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, 39 East Beijing Road, Nanjing, 210008, China;2. University of Science and Technology of China, Hefei, 230026, China;3. Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Minerals, Shandong University of Science and Technology, Qingdao, Shandong, 266590, China;4. School of Geography and Tourism, Qufu Normal University, Rizhao, 276826, China;5. Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Science, Beijing, 100101, China |
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| Abstract: | 1-Alkyl-2,3,6-trimethylbenzenes and a high relative amount of 1,2,3,4-tetramethylbenzene (TTMB) have been previously detected in the marine oils and asphaltenes in the oils from the Tarim Basin. In the present study, the stable carbon isotopic compositions of TTMB and n-alkanes in the pyrolysates of asphaltenes in the marine oils from the northern Tarim Basin and Silurian tar sands from the Tarim Basin were determined. TTMB has stable carbon isotopic compositions in the range from ?23‰ to ?24‰ and are about 12‰ more enriched in 13C than concomitant n-alkanes (?35‰ to ?37‰) in the pyrolysates. The results indicate a contribution from green sulfur bacteria (Chlorobiaceae) to TTMB. Thus, the depositional environments of the source rocks for the marine oils and the bitumen in tar sands from the Tarim Basin are characterized by periods of euxinic conditions within the photic zone. |
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