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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
DOI10.1017/qua.2017.12
收录类别SCI
语种英语
WOS记录号WOS:000402283100005
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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
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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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