Comparison of ice-rafted debris and physical properties in ODP Site 1094 (South Atlantic) with the Vostok ice core over the last four climatic cycles

Kanfoush, Sharon L.; Hodell, David A; Charles, Christopher D.; Janecek, Thomas R; Rack, Frank R

doi:10.1016/s0031-0182(01)00502-8

Cited by 66 publications

(59 citation statements)

References 51 publications

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“…[39] Kanfoush et al [2000] noted that TN057-13PC4/ODP1094 was within the winter sea-ice limit during the last glacial period [Crosta et al, 1998], and concluded that sea-ice rafting was an important transport mechanism of volcanic sediments from the Scotia Arc. Kanfoush et al [2002] further suggested that the percentage of tephra in the coarse fraction of the sediment was directly related to sea-ice extent. They noted the similarity between the ash abundance in South Atlantic sediments and ice core records of dust and sodium concentrations.…”

Section: Geochemistry Geophysicsmentioning

confidence: 97%

“…[12] The published radiocarbon chronology for TN057-13PC4 [Shemesh et al, 2002] was adjusted in a similar manner and the oxygen isotope stratigraphy age model for ODP Site 1094 of Kanfoush et al [2000Kanfoush et al [ , 2002 was adopted. The chronologies of IO1176-83 and RC11-78 are based on Eucampia antarctica stratigraphy and are only used to ensure that the tephra samples were from the last glacial period [Smith et al, 1983;Burckle and Cooke, 1983].…”

Section: Chronologymentioning

confidence: 99%

“…If all ash counted by Kanfoush et al [2000Kanfoush et al [ , 2002 is assumed to be from the SSI, adding the counts of potential SSI-derived phenocrysts to this indicates that 93-99% of the total lithogenic fraction of the coarse sediment is from the SSI (Table 6).…”

Section: Sources Of Clear Mineralsmentioning

confidence: 99%

“…a The third column shows the relative contribution of SSI to the total clear mineral assemblage. The last column takes the SSI contributions from the clear mineral assemblage and adds this to the total tephra abundance from Kanfoush et al [2000Kanfoush et al [ , 2002. Assuming that all tephra is from SSI, the number shown is the SSI contribution to the total lithogenic fraction of the sediment in TN057-13PC4 and ODP Site 1094.…”

Section: Geochemistry Geophysicsmentioning

confidence: 99%

“…In the south, IRD is dominated by volcanic material that is derived mainly from the SSI, with minor contributions from Bouvet Island [Ninkovich et al, 1964;Federman et al, 1982;Cooke, 1978;Smith et al, 1983;Pirrung et al, 2002] and possibly the Antarctic Peninsula (Figure 1). Much of this volcanic material is too coarse grained to have been deposited by direct ashfall and, consequently, sea ice and icebergs have been proposed as the primary mode of transport [Ninkovich et al, 1964;Smith et al, 1983;Kanfoush et al, 2000Kanfoush et al, , 2002. Icebergs are presumed to have carried sediment from the most distant Antarctic sources .…”

Section: Introductionmentioning

confidence: 99%

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Origin and significance of ice‐rafted detritus in the Atlantic sector of the Southern Ocean

Nielsen

Hodell

Kamenov

et al. 2007

Geochem Geophys Geosyst

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Piston core TN057‐14 from the eastern Atlantic sector of the Southern Ocean contains several layers rich in volcanic tephra that were deposited during the last glacial period. Comparison with nearby cores (TN057‐13PC4/ODP Site 1094) indicates that these tephra layers are correlative with the South Atlantic (SA) ice‐rafted detritus (IRD) layers identified by Kanfoush et al. (2000, 2002). We analyzed the tephra for major and trace elements as well as isotopic ratios of strontium, neodymium, and lead. The elemental and isotopic composition of all tephra layers examined indicates the South Sandwich Island volcanic arc (SSI) as their dominant source, with minor input from Bouvet Island. Similar analyses of clear mineral grains (mainly feldspars, quartz, and olivine) also point to the SSI as the main source. We conclude that tephra erupted from the SSI was first deposited as air fall on sea ice and multiyear ice and then secondarily rafted to the studied sites. Deposition of the tephra‐rich IRD layers was controlled by changes in sea surface temperature and sea‐ice conditions in the Polar Frontal Zone of the South Atlantic, rather than Antarctic ice sheet dynamics.

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Section: Geochemistry Geophysicsmentioning

confidence: 97%

Section: Chronologymentioning

confidence: 99%

Section: Sources Of Clear Mineralsmentioning

confidence: 99%

Section: Geochemistry Geophysicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Origin and significance of ice‐rafted detritus in the Atlantic sector of the Southern Ocean

Nielsen

Hodell

Kamenov

et al. 2007

Geochem Geophys Geosyst

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Palaeo Sea Ice Distribution and Reconstruction Derived from the Geological Record

Armand

Leventer

2009

Sea Ice

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Environmental magnetic record of paleoclimate, unroofing of the Transantarctic Mountains, and volcanism in late Eocene to early Miocene glaci‐marine sediments from the Victoria Land Basin, Ross Sea, Antarctica

et al. 2013

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[1] We synthesize environmental magnetic results for sediments from the Victoria Land Basin (VLB), which span a total stratigraphic thickness of 2.6 km and ã 17 Myr age range. We assess how magnetic properties record paleoclimatic, tectonic, and provenance variations or mixtures of signals resulting from these processes. The magnetic properties are dominated by large-scale magnetite concentration variations. In the late Eocene and early Oligocene, magnetite concentration variations coincide with detrital smectite concentration and crystallinity variations, which reflect paleoclimatic control on magnetic properties through influence on weathering regime; high magnetite and smectite concentrations indicate warmer and wetter climates and vice versa. During the early Oligocene, accelerated uplift of the Transantarctic Mountains gave rise to magnetic signatures that reflect progressive erosion of the Precambrian-Mesozoic metamorphic, intrusive, and sedimentary stratigraphic cover succession associated with unroofing of the adjacent Transantarctic Mountains. From the early Oligocene to the early Miocene, a consistent fining upward of magnetite particles through the recovered composite record likely reflects increased physical weathering with glacial grinding contributing to progressively finer grained Ferrar Dolerite-sourced magnetite. After 24 Ma, the magnetic properties of VLB sediments are primarily controlled by the weathering and erosion of McMurdo Volcanic Group rocks; increased volcanic glass contents contribute to the fining upward of magnetite grain size. Overall, long-term magnetic property variations record the first-order geological processes that controlled sedimentation in the VLB, including paleoclimatic, tectonic, provenance, and volcanic influences.

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Comparison of ice-rafted debris and physical properties in ODP Site 1094 (South Atlantic) with the Vostok ice core over the last four climatic cycles

Cited by 66 publications

References 51 publications

Origin and significance of ice‐rafted detritus in the Atlantic sector of the Southern Ocean

Origin and significance of ice‐rafted detritus in the Atlantic sector of the Southern Ocean

Palaeo Sea Ice Distribution and Reconstruction Derived from the Geological Record

Environmental magnetic record of paleoclimate, unroofing of the Transantarctic Mountains, and volcanism in late Eocene to early Miocene glaci‐marine sediments from the Victoria Land Basin, Ross Sea, Antarctica

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