Arid
DOI10.1016/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
ISSN0031-0182
EISSN1872-616X
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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