Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.palaeo.2014.04.009 |
How environmental magnetism can enhance the interpretational value of grain-size analysis: A time-slice study on sediment export to the NW African margin in Heinrich Stadial 1 and Mid Holocene | |
Razik, Sebastian1; Dekkers, Mark J.2; von Dobeneck, Tilo1,3 | |
通讯作者 | Razik, Sebastian |
来源期刊 | PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
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ISSN | 0031-0182 |
EISSN | 1872-616X |
出版年 | 2014 |
卷号 | 406页码:33-48 |
英文摘要 | Sediment dynamics in limnic, fluvial and marine environments can be assessed by granulometric and rock-magnetic methodologies. While classical grain-size analysis by sieving or settling mainly bears information on composition and transport, the magnetic mineral assemblages reflect to a larger extent the petrology and weathering conditions in the sediment source areas. Here, we combine both methods to investigate Late Quaternary marine sediments from five cores along a transect across the continental slope off Senegal. This region near the modern summer Intertropical Convergence Zone is particularly sensitive to climate change and receives sediments from several aeolian, fluvial and marine sources. From each of the investigated five GeoB sediment cores (494-2956 m water depth) two time slices were processed which represent contrasting climatic conditions: the arid Heinrich Stadial 1 (similar to 15 kyr BP) and the humid Mid Holocene (similar to 6 kyr BP). Each sediment sample was split into 16 grain-size fractions ranging from 1.6 to 500 mu m. Concentration and grain-size indicative magnetic parameters (susceptibility, SIRM, HIRM, ARM and ARM/IRM) were determined at room temperature for each of these fractions. The joint consideration of whole sediment and magnetic mineral grain-size distributions allows to address several important issues: (i) distinction of two aeolian sediment fractions, one carried by the north-easterly trade winds (40-63 mu m) and the other by the overlying easterly Harmattan wind (10-20 mu m) as well as a fluvial fraction assigned to the Senegal River (<10 mu m); (ii) identification of three terrigenous sediment source areas: southern Sahara and Sahel dust (low fine-grained magnetite amounts and a comparatively high haematite content), dust from Senegalese coastal dunes (intermediate fine-grained magnetite and haematite contents) and soils from the upper reaches of the Senegal River (high fine-grained magnetite content); (iii) detection of partial diagenetic dissolution of fine magnetite particles as a function of organic input and shore distance; (iv) analysis of magnetic properties of marine carbonates dominating the grain-size fractions 63-500 mu m. (C) 2014 Elsevier B.V. All rights reserved. |
英文关键词 | Environmental magnetism Grain-size analysis Aeolian sediment transport Senegal River Provenance Northwest Africa |
类型 | Article |
语种 | 英语 |
国家 | Germany ; Netherlands |
收录类别 | SCI-E |
WOS记录号 | WOS:000337660300004 |
WOS关键词 | LAST GLACIAL MAXIMUM ; DEEP-SEA SEDIMENTS ; NORTHWEST AFRICA ; EQUATORIAL ATLANTIC ; WIND REGIMES ; SAHARAN DUST ; ABRUPT ONSET ; MONSOON ; LEVEL ; PROVENANCE |
WOS类目 | Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology |
WOS研究方向 | Physical Geography ; Geology ; Paleontology |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/184098 |
作者单位 | 1.Univ Bremen, Dept Geosci, D-28359 Bremen, Germany; 2.Univ Utrecht, Dept Earth Sci, NL-3584 CD Utrecht, Netherlands; 3.Univ Bremen, Ctr Marine Environm Sci, MARUM, D-28359 Bremen, Germany |
推荐引用方式 GB/T 7714 | Razik, Sebastian,Dekkers, Mark J.,von Dobeneck, Tilo. How environmental magnetism can enhance the interpretational value of grain-size analysis: A time-slice study on sediment export to the NW African margin in Heinrich Stadial 1 and Mid Holocene[J],2014,406:33-48. |
APA | Razik, Sebastian,Dekkers, Mark J.,&von Dobeneck, Tilo.(2014).How environmental magnetism can enhance the interpretational value of grain-size analysis: A time-slice study on sediment export to the NW African margin in Heinrich Stadial 1 and Mid Holocene.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,406,33-48. |
MLA | Razik, Sebastian,et al."How environmental magnetism can enhance the interpretational value of grain-size analysis: A time-slice study on sediment export to the NW African margin in Heinrich Stadial 1 and Mid Holocene".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 406(2014):33-48. |
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