| Variations in delta C-13 values of sedimentary organic matter since late Miocene time in the Indus Fan (IODP Site 1457) of the eastern Arabian Sea | |
| Khim, Boo-Keun1; Lee, Jongmin1; Ha, Sanbeom1; Park, Jinku1; Pandey, Dhananjai K.2; Clift, Peter D.3; Kulhanek, Denise K.4; Steinke, Stephan5; Griffith, Elizabeth M.6; Suzuki, Kenta7; Xu, Zhaokai8 | |
| 2020-06-01 | |
| Source Publication | GEOLOGICAL MAGAZINE
 |
| ISSN | 0016-7568 |
| Volume | 157Issue:6Pages:1012-1021 |
| Corresponding Author | Khim, Boo-Keun(bkkhim@pusan.ac.kr) |
| Abstract | A 1108.6 m long core was recovered at Site U1457 located on the Indus Fan in the Laxmi Basin of the eastern Arabian Sea during IODP Expedition 355. Shipboard examinations defined five lithologic units (I to V) of the lower Paleocene to Holocene sedimentary sequence. In this study, delta C-13 values of sedimentary organic matter (SOM) confirm the differentiation of the lithologic units and further divide units III and IV into two subunits (1 and 2). Based on the underlying assumption that the SOM is decided primarily by a mixture of marine and terrestrial origins, delta C-13(SOM) values at Site U1457 provide information on the terrestrial catchment conditions since late Miocene time. Low delta C-13(SOM) values from late Miocene to late Pleistocene times are similar (c. -22.0 parts per thousand) for the most part, reflecting a consistent contribution of terrestrial organic matter from the catchment areas characterized by dominant C3 land plants. Significantly lower delta C-13(SOM) values (c. -24.0 parts per thousand) in Unit III-2 (similar to 8 to similar to 7 Ma) might be due to a greater input of C3 terrestrial organic matter. The increase in delta C-13(SOM) values at similar to 7 Ma and the appearance of high delta C-13(SOM) values (c. -18.0 parts per thousand) within Unit III-1 (similar to 7 to similar to 2 Ma) indicate that C4 biomass overwhelmed the terrestrial catchment environment as a result of enhanced terrestrial aridity in the Himalayan foreland. The three-end-member simple mixing model, estimating the relative contributions of SOM from terrestrial C3 and C4 plants and marine phytoplankton, supports our interpretation of the distribution of C3 and C4 land plants in the terrestrial catchment environment. |
| Keyword | organic matter organic carbon carbon isotope Indus Fan Arabian Sea IODP |
| DOI | 10.1017/S0016756818000870 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | National Research Foundation of Korea grant[2016R1A2B4008256] |
| WOS Research Area | Geology |
| WOS Subject | Geosciences, Multidisciplinary |
| WOS ID | WOS:000539094000016 |
| Publisher | CAMBRIDGE UNIV PRESS |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.qdio.ac.cn/handle/337002/167760 |
| Collection | 海洋地质与环境重点实验室 |
| Corresponding Author | Khim, Boo-Keun |
| Affiliation | 1.Pusan Natl Univ, Dept Oceanog, Busan 46241, South Korea 2.Natl Ctr Antarctic & Ocean Res, Dept Marine Geophys, Vasco Da Gama 403804, Goa, India 3.Louisiana State Univ, Dept Geol & Geophys, Baton Rouge, LA 70803 USA 4.Texas A&M Univ, Int Ocean Discovery Program, College Stn, TX 77845 USA 5.Xiamen Univ, Dept Geol Oceanog, Xiamen 361102, Peoples R China 6.Ohio State Univ, Sch Earth Sci, Columbus, OH 43210 USA 7.Hokkaido Univ, Grad Sch Environm Sci, Sapporo, Hokkaido 0600810, Japan 8.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China |
| Recommended Citation GB/T 7714 | Khim, Boo-Keun,Lee, Jongmin,Ha, Sanbeom,et al. Variations in delta C-13 values of sedimentary organic matter since late Miocene time in the Indus Fan (IODP Site 1457) of the eastern Arabian Sea[J]. GEOLOGICAL MAGAZINE,2020,157(6):1012-1021. |
| APA | Khim, Boo-Keun.,Lee, Jongmin.,Ha, Sanbeom.,Park, Jinku.,Pandey, Dhananjai K..,...&Xu, Zhaokai.(2020).Variations in delta C-13 values of sedimentary organic matter since late Miocene time in the Indus Fan (IODP Site 1457) of the eastern Arabian Sea.GEOLOGICAL MAGAZINE,157(6),1012-1021. |
| MLA | Khim, Boo-Keun,et al."Variations in delta C-13 values of sedimentary organic matter since late Miocene time in the Indus Fan (IODP Site 1457) of the eastern Arabian Sea".GEOLOGICAL MAGAZINE 157.6(2020):1012-1021. |
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