干旱区生态环境知识资源中心(Arid): Source-to-sinkmagnetic properties of NE Saharan dust in Eastern Mediterranean marine sediments: review and paleoenvironmental implications

Arid

DOI	10.3389/feart.2015.00019
	Source-to-sinkmagnetic properties of NE Saharan dust in Eastern Mediterranean marine sediments: review and paleoenvironmental implications
	Larrasoana, Juan C.; Roberts, Andrew P.; Liu, Qingsong; Lyons, Richard; Oldfield, Frank; Rohling, Eelco J.; Heslop, David
通讯作者	Larrasoana, JC
来源期刊	FRONTIERS IN EARTH SCIENCE
EISSN	2296-6463
出版年	2015
卷号	3
英文摘要	We present a review of the magnetic properties of NE Saharan dust that was conducted, following a source-to-sink approach, to unravel the paleoclimatic significance of environmental magnetic records from Eastern Mediterranean marine sediments. Our synthesis indicates that pedogenic hematite, which formed during past wetter Green Sahara periods(GSPs), is the most common magnetic mineral in Eastern Mediterranean marine sediments as a result of its eolian transportation, along with smaller amounts of lithogenic hematite, from the NE Sahara. Coupled with the limited impact of reductive sedimentary diagenesis on hematite abundances in Eastern Mediterranean Sea sediments, this indicates that hematite concentrations provide reliable quantitative estimates of NE Saharan dust supply. Our results indicate that variations in NE Saharan dust supply record an on-off mechanism in which a key control on eolian input is provided by the monsoon-driven spread and retreat of savannah vegetation through the Sahara. Magnetite/maghemite is also a common magnetic mineral in NE Saharan dust, and also formed mainly pedogenically during GSPs but in much smaller amounts compared to hematite. Limited production of magnetite/maghemite in the source area during GSPs, along with the later imprint of diagenetic processes, indicates that magnetite/maghemite abundances cannot be used to estimate dust inputs from the NE Sahara. Goethite cannot be used either to estimate variations in NE Saharan dust supply, because its occurrence in Eastern Mediterranean marine sediments also appears to be linked to fluvial inputs. Our results reinforce the view that a source-to-sink approach should be routinely conducted in environmental magnetic studies to understand the complex combination of processes involved in the production, transportation, sedimentation, and diagenetic evolution of magnetic minerals in sedimentary environments.
英文关键词	environmental magnetism marine sediments eolian dust Sahara Eastern Mediterranean Sea hematite magnetite maghemite
类型	Review
语种	英语
开放获取类型	DOAJ Gold, Green Published
收录类别	ESCI
WOS记录号	WOS:000421619700054
WOS关键词	GLACIAL-INTERGLACIAL CHANGES ; ACTIVE OXIDATION FRONT ; RED-SEA HILLS ; MAGNETIC-SUSCEPTIBILITY ; AFRICAN DUST ; SAPROPEL-BEARING ; NORTH PACIFIC ; AEOLIAN DUST ; PALEOMAGNETISM ; DESERT
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
来源机构	中国科学院地质与地球物理研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/331363
作者单位	[Larrasoana, Juan C.] Zaragoza, Zaragoza, Spain; Inst Geologico & Minero Espana, Zaragoza, Spain; ICTJA CSIC, Inst Earth Sci Jaume Almera, Barcelona, Spain; Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT, Australia; Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China; Univ Liverpool, Sch Environm Sci, Liverpool, Merseyside, England; Univ Southampton, Ocean & Earth Sci Natl Oceanog Ctr, Southampton, Hants, England
推荐引用方式 GB/T 7714	Larrasoana, Juan C.,Roberts, Andrew P.,Liu, Qingsong,et al. Source-to-sinkmagnetic properties of NE Saharan dust in Eastern Mediterranean marine sediments: review and paleoenvironmental implications[J]. 中国科学院地质与地球物理研究所,2015,3.
APA	Larrasoana, Juan C..,Roberts, Andrew P..,Liu, Qingsong.,Lyons, Richard.,Oldfield, Frank.,...&Heslop, David.(2015).Source-to-sinkmagnetic properties of NE Saharan dust in Eastern Mediterranean marine sediments: review and paleoenvironmental implications.FRONTIERS IN EARTH SCIENCE,3.
MLA	Larrasoana, Juan C.,et al."Source-to-sinkmagnetic properties of NE Saharan dust in Eastern Mediterranean marine sediments: review and paleoenvironmental implications".FRONTIERS IN EARTH SCIENCE 3(2015).