Late Quaternary sedimentary environmental evolution offshore of the Hangzhou Bay,East China——implications for sea level change and formation of Changjiang alongshore current
文献类型：CNKI期刊论文
| 作者 | Wang X(王昕); Shi XF(石学法); Wang GQ(王国庆); Qiao SQ(乔淑卿); Wang KS(王昆山); Yao ZQ(姚政权); Wang XC(王旭晨) |
| 发表日期 | 2015-05-15 |
| 出处 | Chinese Journal of Oceanology and Limnology
 |
| 关键词 | continental shelf off Hangzhou Bay East China Sea mud wedge Changjiang alongshore current sediments transportation and deposition postglacial sea level |
| 英文摘要 | This study focuses on sedimentary environmental changes offshore of Hangzhou Bay,East China,since the Late Quaternary. AMS 1 4 C ages from core CJK10,lithologies,distribution of foraminifera,heavy minerals,and S and Cl elements show a f luvial terrace environment during ~23.2–11.0 cal ka BP; a littoral to tidal-f lat environment during 11.0–10.2 cal ka BP; and a shallow marine environment with a relatively low sedimentation rate(0.1–0.22 cm/a) since 4.3 cal ka BP. High depositional rates(~1.6 cm/a) from 10.9 to 10.2 cal ka BP resulted from suff icient accommodation space created by rapid sea level rise from-44 m to-33 m,from high sediment delivery by local rivers,and effective trapping of sediments by tidal-f lat vegetation. The rate of sea level rise was variable; relatively high from 10.9 to 10.6 cal ka BP(2.1 cm/a),and lower since 10.6 cal ka BP(1.2 cm/a). The Changjiang alongshore current crossed the Hangzhou Bay to form the mud wedge on the inner shelf of the East China Sea later than 9.4 cal ka BP. The CJK10 site was a tide-dominated shelf environment and experienced erosion from approximately 9.4–9.2 cal ka BP to 4.3 cal ka BP. The depositional hiatus was caused by the Changjiang alongshore current,which was relatively weak during 9.4–7.5 cal ka BP and increased in strength during ~7.5–4 cal ka BP. From ~4.3 cal ka BP,a large amount of sediment from the Changjiang River was partly deposited on the continental shelf of Hangzhou Bay with some transported southward. Therefore,this study clarif ies the history of Changjiang-derived sediment dispersal and deposition,although a detailed record of the changes in the Changjiang alongshore current since 4.3 cal ka BP is diff icult to obtain because of the scarcity of evidence. |
| 文献子类 | CNKI期刊论文 |
| 资助机构 | Supported by the National Special Research Fund for Non-Profit Marine Sector(No.200805063) ; the Continental Shelf Drilling Program(No.GZH201100202) ; the State Key Laboratory of Marine Geology and Environment,Institute of Oceanology Program(No.MGE2012KG09) |
| 卷 | v.33期:03页:198-213 |
| 语种 | 英文; |
| 分类号 | P736.21 |
| ISSN号 | 0254-4059 |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/190024]  |
| 专题 | 中国科学院海洋研究所 |
| 作者单位 | 1.KeyLaboratoryofMarineSedimentology&EnvironmentalGeology,FirstInstituteofOceanography,StateOceanicAdministration 2.FacultyofEarthScience,ChinaUniversityofGeosciences 3.UniversityofMassachusettsBoston,100MorrisseyBlvd. 4.InstituteofOceanology,ChineseAcademyofSciences,KeyLaboratoryofMarineGeologyandEnvironment 5.UniversityofChineseAcademyofSciences |
| 推荐引用方式 GB/T 7714 | Wang X,Shi XF,Wang GQ,et al. Late Quaternary sedimentary environmental evolution offshore of the Hangzhou Bay,East China——implications for sea level change and formation of Changjiang alongshore current. 2015. |
入库方式： OAI收割
来源：海洋研究所
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