Sedimentary facies of the subaqueous Changjiang River delta since the late Pleistocene
文献类型：CNKI期刊论文
| 作者 | Xu TY(徐涛玉); Shi XF(石学法); Wang GQ(王国庆); Qiao SQ(乔淑卿); Yang G(杨刚); Liu SF(刘升发); Wang XC(王旭晨); Zhao QH(赵泉鸿) |
| 发表日期 | 2013-09-15 |
| 出处 | Chinese Journal of Oceanology and Limnology
 |
| 关键词 | the subaqueous Changjiang(Yangtze) River delta sedimentary facies Last Glacial Maximum |
| 英文摘要 | 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 with14C 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 ~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,AMS14C dating of core CJK07 shows poor chronological order,indicating that the sediments were reworked by strong tidal currents and that sediment deposited since ~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. |
| 文献子类 | CNKI期刊论文 |
| 资助机构 | Supported by the Marine Public Welfare Research Project(No.200805063) ; the National Natural Science Foundation of China(Nos.41076023 and 41106065) ; the Basic Fund Project of National Science and Technology Ministry(No.2008FY220300) ; the Coastal Investigation and Research Project of China(No.908-02-02-05) |
| 卷 | v.31期:05页:175-187 |
| 语种 | 英文; |
| 分类号 | P736.21 |
| ISSN号 | 0254-4059 |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/190744]  |
| 专题 | 中国科学院海洋研究所 |
| 作者单位 | 1.InstituteofOceanology,ChineseAcademyofSciences 2.FirstInstituteofOceanography,StateOceanicAdministration,andKeyLaboratoryofStateOceanicAdministrationforMarineSedimentologyandEnvironmentalGeology 3.ChinaUniversityofGeosciences(Wuhan) 4.UniversityofMassachusetts,Massachusetts 5.LaboratoryofMarineGeology,TongjiUniversity |
| 推荐引用方式 GB/T 7714 | Xu TY,Shi XF,Wang GQ,et al. Sedimentary facies of the subaqueous Changjiang River delta since the late Pleistocene. 2013. |
入库方式： OAI收割
来源：海洋研究所
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