Magnetic susceptibility of eastern Mediterranean marine sediments as a proxy for Saharan dust supply?

Larrasoaña, Juan C.; Roberts, Andrew P.; Rohling, Eelco J.

doi:10.1016/j.margeo.2008.06.003

Cited by 41 publications

(32 citation statements)

References 36 publications

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“…These values indicate subtle magnetite concentration variations in background sediments (Figure 3). Magnetic data indicate that hematite is also ubiquitous in Eastern Mediterranean Sea sediments (Kruiver and Passier, 2001;Larrasoaña et al, 2003bLarrasoaña et al, , 2006Larrasoaña et al, , 2008Balsam et al, 2007;Köhler et al, 2008), as has also been shown by diffuse reflectance spectroscopy (DRS) data (Heslop et al, 2007;Liu et al, 2012b). Hematite abundances are typically inferred using HIRM or other properties aimed at isolating high-coercivity mineral signals (e.g., an alternating field-demagnetized IRM or IRM@AF) (Larrasoaña et al, 2003b(Larrasoaña et al, , 2006(Larrasoaña et al, , 2008Liu et al, 2012b).…”

Section: Marine Sedimentsmentioning

confidence: 85%

“…ARM values, and hence magnetite abundances, are lowest (<0.05 Am −1 ) within the lower parts of sapropels and down to 50 cm below them (Figure 3). ARM values are highest (0.2-0.4 Am −1 ) up to 20 cm above sapropels, thereby indicating that magnetite concentration peaks at those positions (Van Santvoort et al, 1997;Kruiver and Passier, 2001;Passier et al, 2001;Passier and Dekkers, 2002;Larrasoaña et al, 2003bLarrasoaña et al, , 2006Larrasoaña et al, , 2008Liu et al, 2012b). ARM values that range between 0.1 and 0.2 Am −1 characterize most background sediments, whether intercalated between sapropels around eccentricity maxima or within thick sapropel-barren intervals near eccentricity minima.…”

Section: Marine Sedimentsmentioning

confidence: 97%

“…Magnetic data indicate that a common magnetic mineral in Eastern Mediterranean marine sediments is magnetite, the abundance of which is best assessed using ARM data (Van Santvoort et al, 1997;Roberts et al, 1999;Kruiver and Passier, 2001;Passier et al, 2001;Passier and Dekkers, 2002;Larrasoaña et al, 2003bLarrasoaña et al, , 2006Larrasoaña et al, , 2008Liu et al, 2012b). ARM values, and hence magnetite abundances, are lowest (<0.05 Am −1 ) within the lower parts of sapropels and down to 50 cm below them (Figure 3).…”

Section: Marine Sedimentsmentioning

confidence: 99%

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Source-to-sink magnetic properties of NE Saharan dust in Eastern Mediterranean marine sediments: review and paleoenvironmental implications

et al. 2015

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Section: Marine Sedimentsmentioning

confidence: 85%

Section: Marine Sedimentsmentioning

confidence: 97%

Section: Marine Sedimentsmentioning

confidence: 99%

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Source-to-sink magnetic properties of NE Saharan dust in Eastern Mediterranean marine sediments: review and paleoenvironmental implications

et al. 2015

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“…We propose that the Red Palaeosol is the outcome of the relatively dry conditions which prevailed between 80 and 55 ka, in light of the relatively constant aeolian dust supply during the formation of the three lowland palaeosol units from 80 to 25 ka ( Fig. 6c-e; Cheddadi and Rossignol-Strick, 1995;Larrasoaña et al, 2008). In other locations, distant from the stream paths, dune-sand sheet complexes up to 40 m thick were deposited, eventually forming the lower exposed units of the present-day shore-parallel ridges (i.e.…”

Section: Evolution Of the Coastal Plain Of Israel During The Late Quamentioning

confidence: 91%

“…6) of the Ocean Drilling Program ODP 160-976 (see location in Fig. 1b; Larrasoaña et al, 2008). A rapid drop in sea level occurred from about 35 ka to 20 ka, when sea level fell from about − 85 mILSD to a minimum of about − 135 mILSD (Rohling et al, 2014), resulting in shoreline migration from about 11 km to about 14 km offshore (Fig.…”

Section: Evolution Of the Coastal Plain Of Israel During The Late Quamentioning

confidence: 99%

New perspectives on coastal landscape reconstruction during the Late Quaternary: A test case from central Israel

Shtienberg

Dix

Roskin

et al. 2017

Palaeogeography, Palaeoclimatology, Palaeoecology

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The stratigraphic architecture of coastal plains is determined by the interactions between local (e.g. fluvial processes and topography), regional (e.g. climate) and global (e.g. sea level) forcing factors, primarily during the Late Quaternary Period. Detailed stratigraphic and sedimentological analyses of boreholes, cored between coastal ridges in the lowlands, coupled with optically stimulated luminescence (OSL) dating, and integrated with existing onshore and offshore databases, has enabled a 4-D reconstruction of the evolution of the coast of Israel during the last glacial-interglacial cycle. This model revealed that Nilotic-sourced littoral sand, intermittently transported inland by wind, has either been lithified into aeolianite or pedogenized into orange-brown palaeosol from about 100 ka to 8 ka. Dark silty clay wetlands were deposited between the aeolian coastal ridges adjacent to streams which cut the Israeli coastal plain and flow westward, from the Last Glacial Maximum until the onset of the Holocene. These units are topped by beach and aeolian quartz sand dated to 6.6-0.1 ka. Diachronous thicknesses and lithological dissimilarities were identified between the sections studied and previous reports on adjacent coastal aeolianite ridges. Streams were found to be a dominant control on the stratigraphical composition and related facies architecture due to fluvial-induced erosion. Consequently, the relief variations between the lowland and cliff controlled aeolian pedogenesis as well as alluvial processes from about 80 to 5 ka. Climate, mainly influenced by precipitation and dust input, induced pedogenic processes; while sea level lowstand during the Last Glacial Maximum is shown to have hindered sediment deposition in the shallow offshore, which in turn affected aeolian transport, reducing sediment accumulation on the palaeo-coastal plain. The palaeoenvironmental model presented in the current study serves as an example for understanding the evolution of similar low-latitude siliciclastic-rich low-gradient shelf-coastal areas during the last glacial-interglacial cycle. Furthermore, it demonstrates the influence of local to global forcing factors on these environments.

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Deciphering bottom current velocity and paleoclimate signals from contourite deposits in the Gulf of Cádiz during the last 140 kyr: An inorganic geochemical approach

Bahr

Jiménez-Espejo

Kolasinac

et al. 2014

Geochem Geophys Geosyst

108

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Contourites in the Gulf of C adiz (GC) preserve a unique archive of Mediterranean Outflow Water (MOW) variability over the past 5.3 Ma. In our study, we investigate the potential of geochemical data obtained by XRF scanning to decipher bottom current processes and paleoclimatic evolution at two different sites drilled during IODP Expedition 339 through contourites in the northern GC: Site U1387, which is bathed by the upper MOW core, and Site U1389, located more proximal to the Strait of Gibraltar. The lack of major downslope transport during the Pleistocene makes both locations ideally suited for our study. The results indicate that the Zr/Al ratio, representing the relative enrichment of heavy minerals (zircon) over less dense alumnosilicates under fast bottom current flow, is the most useful indicator for a semiquantitative assessment of current velocity. Although most elements are biased by current-related processes, the bromine (Br) record, representing organic content, preserves the most pristine climate signal rather independent of grain-size changes. Hence, Br can be used for chronostratigraphy and site-to-site correlation in addition to stable isotope stratigraphy. Based on these findings, we reconstructed MOW variability for Marine Isotope Stages (MIS) 1-5 using the Zr/Al ratio from Site U1387. The results reveal abrupt, millennialscale variations of MOW strength during Greenland Stadials (GS) and Interstadials (GI) with strong MOW during GS and glacial Terminations and a complex behavior during Heinrich Stadials. Millennial-scale variability persisting during periods of poorly expressed GS/GI cyclicities implies a strong internal oscillation of the Mediterranean/North Atlantic climate system.

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Magnetic susceptibility of eastern Mediterranean marine sediments as a proxy for Saharan dust supply?

Cited by 41 publications

References 36 publications

Source-to-sink magnetic properties of NE Saharan dust in Eastern Mediterranean marine sediments: review and paleoenvironmental implications

Source-to-sink magnetic properties of NE Saharan dust in Eastern Mediterranean marine sediments: review and paleoenvironmental implications

New perspectives on coastal landscape reconstruction during the Late Quaternary: A test case from central Israel

Deciphering bottom current velocity and paleoclimate signals from contourite deposits in the Gulf of Cádiz during the last 140 kyr: An inorganic geochemical approach

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