Source of the climate signal recorded by magnetic susceptibility variations in Indian Ocean sediments

Hounslow, Mark W.; Maher, Barbara A.

doi:10.1029/1998jb900085

Cited by 54 publications

(40 citation statements)

References 31 publications

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“…Once deposited in sediments, the signal of airborne magnetic minerals can be overprinted by other detrital or biogenic sources (e.g., Hesse, 1994;Roberts et al, 2011). Moreover, loss of detrital magnetic minerals or authigenic growth of new magnetic phases can occur during sedimentary diagenesis (Hounslow and Maher, 1999;Abrajevitch and Kodama, 2011;Liu et al, 2012a;Roberts, 2015, submitted). Adequate evaluation of the reliability of magnetic minerals as recorders of eolian dust deposition, therefore, demands careful, case-specific investigation of the processes that drive the formation, transportation, accumulation and preservation of magnetic minerals in sediments (Maher, 2011;Liu et al, 2012a).…”

Section: Introductionmentioning

confidence: 99%

“…The areas that have provided the most outstanding records of eolian dust deposition based on magnetic properties are the equatorial Atlantic Ocean (Bloemendal et al, 1993;deMenocal, 1995;Maher and Dennis, 2001;Itambi et al, 2009;Just et al, 2012), the N Pacific Ocean (Doh et al, 1988;Yamazaki and Ioka, 1997;Yamazaki, 2009Yamazaki, , 2012Bailey et al, 2011), the eastern Mediterranean Sea (Dinarès-Turell et al, 2003;Larrasoaña et al, 2003a;Köhler et al, 2008;Liu et al, 2012b), the Arabian Sea (Bloemendal and deMenocal, 1989;deMenocal et al, 1991;Bloemendal et al, 1993;deMenocal, 1995;Hounslow and Maher, 1999), and the Red Sea Roberts et al, 2011) (for a review see Maher, 2011). Given the often discontinuous nature of the continental sedimentary record, these marine magnetic records of eolian dust deposition provide valuable sources of information on past climate variability in continental regions (Liu et al, 2012a).…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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“…The reduction in porosity due to downhole compaction, or past stress history, is the over-riding influence on the absolute bulk density measurement. However, relative variations in bulk density that occur on centimeter to decimeter scales are mostly linked to changes in sediment composition and clay fraction Hounslow and Maher, 1999;Moran et al, 2007.…”

Section: Methodsmentioning

confidence: 99%

“…The magnetic susceptibility reflects variation in the concentration and composition of magnetic material in the sample (Verosub Table 1 All cores included in the study, references used are a) Darby et al, 2005 and Roberts, 1995) and arise from changes in detrital and authigenic magnetic mineral composition as well as the abundance of diamagnetic biogenic material that will dilute the concentration of magnetic minerals (Hounslow and Maher, 1999). The MSCL measured physical property records were used to stratigraphically align cores from individual physiographic areas (see Table 2).…”

Section: Methodsmentioning

confidence: 99%

“…Despite the physiographic variability, the modern sea ice cover acts as a homogenizing agent, re-distributing sediments entrained on the margins throughout the basin. This reasoning leads to speculation that sediments deposited under similar surface circulation and subsurface current regimes should display similar compositional and grain size characteristics, which are the main controls on physical property data, namely bulk density, compressional wave velocity and magnetic susceptibility (Hounslow and Maher, 1999;Moran et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Spatial and temporal Arctic Ocean depositional regimes: a key to the evolution of ice drift and current patterns

Sellén

O’Regan

Jakobsson

2010

Quaternary Science Reviews

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a b s t r a c tSediment physical properties measured in cores from all the major ridges and plateaus in the central Arctic Ocean were studied in order to analyze the spatial and temporal consistency of sediment depositional regimes during the Quaternary. In total, six physiographically distinct areas are outlined. In five of these, cores can be correlated over large distances through characteristic patterns in sediment physical properties. These areas are (1) the southern Mendeleev Ridge, (2) the northern Mendeleev Ridge and Alpha Ridge, (3) the Lomonosov Ridge, (4) the Morris Jesup Rise and (5) the Yermak Plateau. Averaged downhole patterns in magnetic susceptibility, bulk density and lithostratigraphy were compiled to establish a composite stratigraphy for each area. In the sixth physiographic area, the Chukchi Borderland, repeated ice-grounding during recent glacial periods complicates the stratigraphy and prevents the compilation of a composite stratigraphy using the studied material. By utilizing published age models for the studied cores we are able to show that the northern Mendeleev Ridge and Alpha Ridge have the lowest average late Quaternary sedimentation rates, while intermediate sedimentation rates prevail on the southern Mendeleev Ridge and the Morris Jesup Rise. The second highest sedimentation rate is observed on the Lomonosov Ridge, whereas the average sedimentation rate on the Yermak Plateau is more than twice as high. The close correlation of physical properties within each area suggests uniform variations in sediment transport through time, at least throughout the later part of the Quaternary. The unique stratigraphic characteristics within each area is the product of similar past depositional regimes and are key for furthering our understanding of the evolution of ice drift and current patterns in the central Arctic Ocean.

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Cyclic magnetite dissolution in Pleistocene sediments of the abyssal northwest Pacific Ocean: Evidence for glacial oxygen depletion and carbon trapping

et al. 2016

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The carbonate-free abyss of the North Pacific defies most paleoceanographic proxy methods and hence remains a "blank spot" in ocean and climate history. Paleomagnetic and rock magnetic, geochemical, and sedimentological methods were combined to date and analyze seven middle to late Pleistocene northwest Pacific sediment cores from water depths of 5100 to 5700 m. Besides largely coherent tephra layers, the most striking features of these records are nearly magnetite-free zones corresponding to glacial marine isotope stages (MISs) 22, 12, 10, 8, 6, and 2. Magnetite depletion is correlated with organic carbon and quartz content and anticorrelated with biogenic barite and opal content. Within interglacial sections and mid-Pleistocene transition glacial stages MIS 20, 18, 16, and 14, magnetite fractions of detrital, volcanic, and bacterial origin are all well preserved. Such alternating successions of magnetic iron mineral preservation and depletion are known from sapropel-marl cycles, which accumulated under periodically changing bottom water oxygen and redox conditions. In the open central northwest Pacific Ocean, the only conceivable mechanism to cause such abrupt change is a modified glacial bottom water circulation. During all major glaciations since MIS 12, oxygen-depleted Antarctic Bottom Water (AABW)-sourced bottom water seems to have crept into the abyssal northwest Pacific below~5000 m depth, thereby changing redox conditions in the sediment, trapping and preserving dissolved and particulate organic matter and, in consequence, reducing and dissolving both, biogenic and detrital magnetite. At deglaciation, a downward progressing oxidation front apparently remineralized and released these sedimentary carbon reservoirs without replenishing the magnetite losses.

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Source of the climate signal recorded by magnetic susceptibility variations in Indian Ocean sediments

Cited by 54 publications

References 31 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

Spatial and temporal Arctic Ocean depositional regimes: a key to the evolution of ice drift and current patterns

Cyclic magnetite dissolution in Pleistocene sediments of the abyssal northwest Pacific Ocean: Evidence for glacial oxygen depletion and carbon trapping

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