Institutional Repository of Key Laboratory of Marine Ecology & Environmental Sciences, CAS
| Sedimentary facies of the subaqueous Changjiang River delta since the late Pleistocene | |
| Xu Taoyu1,2,3; Shi Xuefa2,3; Wang Guoqing4; Qiao Shuqing2,3; Yang Gang2,3; Liu Shengfa2,3; Wang Xuchen5; Zhao Quanhong6; Shi, XF | |
| 2013-09-01 | |
| 发表期刊 | CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY
 |
| ISSN | 0254-4059 |
| 卷号 | 31期号:5页码:1107-1119 |
| 文章类型 | Article |
| 摘要 | The sedimentary facies of the subaqueous Changjiang (Yangtze) River delta since the late Pleistocene was studied based on lithology and foraminifera analysis for two boreholes, CJK07 and CJK11, along with C-14 dating. Four sedimentary facies were identified, namely fluvial, tidal flat, offshore, and prodelta facies. The fluvial sedimentary facies is comprised of fluvial channel lag deposits, fluvial point bar deposits, and floodplain deposits, showing a fining-upward sequence in general with no benthic foraminifera. A layer of stiff clay overlies the fluvial deposits in core CJK07, indicating a long-term exposure environment during the Last Glacial Maximum (LGM). During the postglacial sea-level rise around 13-7.5 cal ka BP, the tidal flat facies was deposited in core CJK11, characterized by abundant silt-clay couplets. Euryhaline species dominate the subtidal flat foraminiferal assemblages, while almost no foraminifera was found in the intertidal flat. The offshore environment was the major sedimentary environment when the sea level reached its highest level around 7.5 cal ka BP, with a maximum accumulation rate of 10 mm/a found in core CJK11. Prodelta sediments have been deposited in core CJK11 since similar to 3 cal ka BP, after the formation of the Changjiang River delta. The difference in sedimentary facies between core CJK07 and CJK11 is due to their location: core CJK07 was in an interfluve while core CJK11 was in an incised valley during the LGM. Furthermore, AMS 14 C dating of core CJK07 shows poor chronological order, indicating that the sediments were reworked by strong tidal currents and that sediment deposited since similar to 7.7 cal ka BP in core CJK07 was eroded away by modern hydrodynamic forces caused by the southward shift of the Changjiang River delta depocenter.; The sedimentary facies of the subaqueous Changjiang (Yangtze) River delta since the late Pleistocene was studied based on lithology and foraminifera analysis for two boreholes, CJK07 and CJK11, along with C-14 dating. Four sedimentary facies were identified, namely fluvial, tidal flat, offshore, and prodelta facies. The fluvial sedimentary facies is comprised of fluvial channel lag deposits, fluvial point bar deposits, and floodplain deposits, showing a fining-upward sequence in general with no benthic foraminifera. A layer of stiff clay overlies the fluvial deposits in core CJK07, indicating a long-term exposure environment during the Last Glacial Maximum (LGM). During the postglacial sea-level rise around 13-7.5 cal ka BP, the tidal flat facies was deposited in core CJK11, characterized by abundant silt-clay couplets. Euryhaline species dominate the subtidal flat foraminiferal assemblages, while almost no foraminifera was found in the intertidal flat. The offshore environment was the major sedimentary environment when the sea level reached its highest level around 7.5 cal ka BP, with a maximum accumulation rate of 10 mm/a found in core CJK11. Prodelta sediments have been deposited in core CJK11 since similar to 3 cal ka BP, after the formation of the Changjiang River delta. The difference in sedimentary facies between core CJK07 and CJK11 is due to their location: core CJK07 was in an interfluve while core CJK11 was in an incised valley during the LGM. Furthermore, AMS 14 C dating of core CJK07 shows poor chronological order, indicating that the sediments were reworked by strong tidal currents and that sediment deposited since similar to 7.7 cal ka BP in core CJK07 was eroded away by modern hydrodynamic forces caused by the southward shift of the Changjiang River delta depocenter. |
| 关键词 | The Subaqueous Changjiang (Yangtze) River Delta Sedimentary Facies Last Glacial Maximum |
| 学科领域 | Marine & Freshwater Biology ; Oceanography |
| DOI | 10.1007/s00343-013-2281-1 |
| URL | 查看原文 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS研究方向 | Marine & Freshwater Biology ; Oceanography |
| WOS类目 | Limnology ; Oceanography |
| WOS记录号 | WOS:000324111300019 |
| WOS关键词 | INCISED-VALLEY FILL ; EAST CHINA SEA ; YANGTZE DELTA ; YELLOW-RIVER ; EVOLUTION ; HOLOCENE ; OFFSHORE ; ESTUARY |
| WOS标题词 | Science & Technology ; Life Sciences & Biomedicine ; Physical Sciences |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/16493 |
| 专题 | 海洋生态与环境科学重点实验室 |
| 通讯作者 | Shi, XF |
| 作者单位 | 1.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China 2.State Ocean Adm, Inst Oceanog 1, Qingdao 266061, Peoples R China 3.State Ocean Adm Marine Sedimentol & Environm Geol, Key Lab, Qingdao 266061, Peoples R China 4.China Univ Geosci, Wuhan 430074, Peoples R China 5.Univ Massachusetts, Boston, MA 02125 USA 6.Tongji Univ, Lab Marine Geol, Shanghai 200092, Peoples R China |
| 第一作者单位 | 中国科学院海洋研究所 |
| 推荐引用方式 GB/T 7714 | Xu Taoyu,Shi Xuefa,Wang Guoqing,et al. Sedimentary facies of the subaqueous Changjiang River delta since the late Pleistocene[J]. CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY,2013,31(5):1107-1119. |
| APA | Xu Taoyu.,Shi Xuefa.,Wang Guoqing.,Qiao Shuqing.,Yang Gang.,...&Shi, XF.(2013).Sedimentary facies of the subaqueous Changjiang River delta since the late Pleistocene.CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY,31(5),1107-1119. |
| MLA | Xu Taoyu,et al."Sedimentary facies of the subaqueous Changjiang River delta since the late Pleistocene".CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY 31.5(2013):1107-1119. |
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