| Geochemical composition of Tanzanian shelf sediments indicates Holocene climatic and sea-level changes | |
| Liu, Xiting1,2,3; Rendle-Buehring, Rebecca2,3; Henrich, Ruediger2,3 | |
| 2017-05-01 | |
| 发表期刊 | QUATERNARY RESEARCH
 |
| 卷号 | 87期号:3页码:442-454 |
| 文章类型 | Article |
| 摘要 | We present a high-resolution geochemical and grain-size record from a Holocene sediment core off the Pangani River mouth, Tanzania. Elemental ratios between biogenic elements and Al (i.e., Ca/Al, Mg/Al, and Sr/Al) are mainly influenced by terrigenous dilution on carbonate concentration and/or limitation of carbonate production as a result of variations in the supply of fine-grained terrigenous sediments of the Pangani River. Such elemental ratios increased significantly at the end of the mid-Holocene between 5 and 3.5 ka, demonstrating a gradual transition from the humid early and mid-Holocene to the arid late Holocene in East Africa. Among the elemental ratios between terrigenous elements and Al, Si/Al and K/Al ratios correlate to grain-size variation, indicating a change in sedimentation regime. Fe/Al and Ti/Al ratios show that the sediment source area has shifted from the terrestrial volcanic region of Tanzania (Fe, Ti rich) to the coastal and inner-shelf regions (Fe, Ti poor) around 7.5 ka, in response to arid climate and high sea level. Our geochemical results correspond with a sea-surface temperature record derived from the same sediment core, indicating that the end of the East African Humid Period could have been gradual and related to the cooling water in the western Indian Ocean. |
| 关键词 | X-ray Fluorescence Grain Size East Africa Relative Sea Level Holocene |
| DOI | 10.1017/qua.2017.12 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000402283100005 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 版本 | 出版稿 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/137107 |
| 专题 | 海洋地质与环境重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 2.Univ Bremen, MARUM Ctr Marine Environm Sci, D-28359 Bremen, Germany 3.Univ Bremen, Fac Geosci, D-28359 Bremen, Germany |
| 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 | Liu, Xiting,Rendle-Buehring, Rebecca,Henrich, Ruediger. Geochemical composition of Tanzanian shelf sediments indicates Holocene climatic and sea-level changes[J]. QUATERNARY RESEARCH,2017,87(3):442-454. |
| APA | Liu, Xiting,Rendle-Buehring, Rebecca,&Henrich, Ruediger.(2017).Geochemical composition of Tanzanian shelf sediments indicates Holocene climatic and sea-level changes.QUATERNARY RESEARCH,87(3),442-454. |
| MLA | Liu, Xiting,et al."Geochemical composition of Tanzanian shelf sediments indicates Holocene climatic and sea-level changes".QUATERNARY RESEARCH 87.3(2017):442-454. |
| 条目包含的文件 | ||||||
| 文件名称/大小 | 文献类型 | 版本类型 | 开放类型 | 使用许可 | ||
| Geochemical composit（1466KB） | 期刊论文 | 出版稿 | 限制开放 | CC BY-NC-SA | 浏览 | |
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