IOCAS-IR  > 海洋地质与环境重点实验室
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
Source PublicationQUATERNARY RESEARCH
Volume87Issue:3Pages:442-454
SubtypeArticle
AbstractWe 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.
KeywordX-ray Fluorescence Grain Size East Africa Relative Sea Level Holocene
DOI10.1017/qua.2017.12
Indexed BySCI
Language英语
WOS IDWOS:000402283100005
Citation statistics
Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.qdio.ac.cn/handle/337002/137107
Collection海洋地质与环境重点实验室
Affiliation1.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
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
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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.
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