Accumulation of terrestrial organic carbon on an active continental margin offshore southwestern Taiwan: Source-to-sink pathways of river-borne organic particles |
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| Institution: | 1. Institute of Oceanography, National Taiwan University, Taipei, Taiwan;2. Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan;3. Institute of Marine Geology and Chemistry, National Sun-Yet-Sen University, Kaohsiung, Taiwan;1. Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, China;2. Institute of Oceanography, National Taiwan University, Taipei, Taiwan, ROC;3. Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China;4. Faculty of Earth Sciences, China University of Geosciences, Wuhan, China;5. China National Offshore Oil Zhanjiang Ltd. Corporation, Zhanjiang, China;1. Research and Development Center for Ocean Drilling Science, Yokohama Institute for Earth Sciences, JAMSTEC, 3173-25 Showa-machi, Kanazawa-ku, Yokohama, Kanagawa, 236-0001, Japan;2. Geological Survey of Japan, AIST, Central 7, 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8567, Japan;3. ReCCLE, Shimane University, 1060 Nishikawatsu-cho, Matsue, Shimane, 690-8504, Japan;1. CAS Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Marine Geology Survey Institute of Hainan Province, Haikou 570206, China;1. Petroleum Resources Technology, University of Science and Technology (UST), Daejeon, 305-350, Republic of Korea;2. Petroleum and Marine Research Division, Korea Institute of Geoscience and Mineral Resources (KIGAM), Daejeon, 305-350, Republic of Korea;1. State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China;2. Geological Institute, Department of Earth Sciences, ETH Zürich, 8092 Zürich, Switzerland;3. Department of Geological Oceanography and State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361102, China;4. Laboratory of Ion Beam Physics, ETH Zürich, Otto-Stern-Weg 5, 8093 Zürich, Switzerland;5. Department of Earth Science-Geochemistry, Geosciences, Utrecht University, 3584 CD Utrecht, the Netherlands;1. Department of Marine Environment and Engineering, National Sun Yat-sen University, 80424, Kaohsiung, Taiwan, ROC;2. Kuroshio Research Group, Asia-pacific Ocean Research Center, National Sun Yat-sen University, 80424, Kaohsiung, Taiwan, ROC;3. Research Center of Environmental Medicine, Kaohsiung Medical University, 80708, Kaohsiung, Taiwan, ROC;4. Department of Public Health, College of Health Sciences, Kaohsiung Medical University, 80708, Kaohsiung, Taiwan, ROC;5. School of Energy and Environment, City University of Hong Kong, Kowloon, Hong Kong;6. Department of Oceanography, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan, ROC |
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| Abstract: | Sediment samples (213 sites) collected from the tectonic-active continental margin, offshore southwestern Taiwan were analyzed for grain sizes, organic carbon, nitrogen and carbon isotopic composition to obtain mass accumulation rate of terrestrial organic carbon and carbon budget to evaluate fate of terrestrial organic carbon from small mountainous rivers on the continental margin offshore southwestern Taiwan. Terrestrial organic carbon accumulation rates range from 0.29 to 45.6 g C m−2 yr−1 with a total accumulation budget of 0.063 Mt yr−1, which accounts for less than 13% of total river particulate organic carbon loads exported from the adjacent rivers, the Gaoping (a.k.a., Kaoping), Erhjen and Tsengwen rivers. This low burial efficiency of terrestrial organic carbon demonstrated that a majority of river-borne particles together with organic materials was moved away from the study area.For the river-borne particles from the Gaoping river, a pair of depocenters in the upper slope flanking the Gaoping submarine canyon are the locations where the maximum TCorg accumulation rate were observed which hold up to 45% (0.016 Mt yr−1) of the calculated accumulation found in the study region. On the other hand, the occurrence of higher-fraction terrestrial organic carbon in the upper and middle Gaoping submarine canyon suggests that a majority of particulate organic carbon of the Gaoping river was transported directly into the deep-sea basin through the Gaoping submarine canyon. Our results demonstrated that active margin with narrow shelf and slope is not an efficient sink for the large amount of terrigenous organic carbon supplied by the small rivers, but, a transient environment for these river derived particles. |
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| Keywords: | Terrestrial organic carbon Small mountainous river Gaoping submarine canyon |
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