Antarctic environmental variability since the late Miocene: ODP Site 745, the East Kerguelen sediment drift

Joseph, Leah H; Rea, David K.; Pluijm, Ben A. van der; Gleason, James D.

doi:10.1016/s0012-821x(02)00661-1

Cited by 34 publications

(33 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previous work in the nearby Kerguelen Plateau area (Joseph et al, 2002) identified Neogene time intervals of significantly enhanced sediment transport and IRD input to the Southern Ocean, indicating an active and wetbased EAIS. However, the relatively low time resolution of their studies did not allow determination of the frequency of ice advances.…”

Section: Ice-volume Changesmentioning

confidence: 85%

“…However, low-resolution studies that cover long time intervals of the Neogene have presented evidence of a dynamic EAIS with sliding glaciers carrying large amounts of basal and supraglacial debris to the continental margin (Hambrey and McKelvey, 2000). Furthermore, Joseph et al (2002) interpreted pulses of fine-grained sediment delivery to the ocean basins as representing times of retreating warm-based ice sheets.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Evidence for orbitally controlled size variations of the East Antarctic Ice Sheet during the late Miocene

Grützner

Rebesco

Cooper

et al. 2003

Geol

View full text Add to dashboard Cite

Ocean Drilling Program Site 1165 penetrated drift sediments on the East Antarctic continental rise and recovered sediments from a low-energy depositional environment. The sediments are characterized by prominent alternations between a green to greenish-gray diatom-bearing hemipelagic facies and gray to dark gray hemiturbiditic facies. Our investigation of an upper Miocene section, using high-resolution color spectra, multisensor core logs, and X-ray fluorescence scans, reveals that sedimentation changes occur at Milankovitch orbital frequencies of obliquity and precession. We use this finding to derive an astronomical calibrated time scale and to calculate iron mass-accumulation rates, as a proxy for sediment-accumulation rates. Terrigenous iron fluxes change by as much as 100% during each obliquity cycle. This change and an episodic pattern of enhanced icerafted debris deposition during times of deglaciation provide evidence for a dynamic and likely wet-based late Miocene East Antarctic Ice Sheet (EAIS) that underwent large size variations at orbital time scales. The dynamic behavior of the EAIS implies that a significant proportion of the variability seen in oxygen isotope records of the late Miocene reflects Antarctic ice-volume changes.

show abstract

Section: Ice-volume Changesmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Evidence for orbitally controlled size variations of the East Antarctic Ice Sheet during the late Miocene

Grützner

Rebesco

Cooper

et al. 2003

Geol

View full text Add to dashboard Cite

show abstract

“…In Antarctica erosional unconformities on the Prydz Bay continental shelf (Hambrey et al, 1991) and maxima in the accumulation of ice rafted material at the Kerguelen Plateau Joseph et al, 2002) suggest that the Lambert Glacier/Amery Ice Shelf complex temporarily had a larger extension than at present day.…”

Section: Introductionmentioning

confidence: 99%

Terrigenous flux and biogenic silica deposition at the Antarctic continental rise during the late Miocene to early Pliocene: implications for ice sheet stability and sea ice coverage

Grützner

Hillenbrand

Rebesco

2005

Global and Planetary Change

View full text Add to dashboard Cite

Drift sediments recovered from the East Antarctic continental rise at Ocean Drilling Program (ODP) Site 1165 are used to infer variations in East Antarctic Ice Sheet (EAIS) stability and sea ice coverage during the late Miocene and early Pliocene. A significant increase in the deposition of biogenic opal from~5.8 to 5.2 Ma points to an early Pliocene reduction in sea ice and a subsequent increase in biological productivity. Time intervals at~7.2 to 6.6 Ma and~5.2 to 4.8 Ma are characterized by pronounced maxima in the long-term trend of terrigenous matter accumulation (MAR ter ) indicating high continental erosion rates potentially caused by ice sheet growth. A Southern Ocean wide impact of these events is suggested by similar evidence found at ODP Site 1095 (Antarctic Peninsula). Superimposed on the MAR ter maxima we observe enhanced orbital variability in iron accumulation at Site 1165 pointing to a dynamic behavior of the EAIS with waxing and waning ice masses. From the concurrence of these high amplitude ice sheet fluctuations with maximum variance in Earth's obliquity, we propose that the insolation gradient between high and low latitudes affected the delivery of moisture to Antarctica and thus controlled ice volume variations. D

show abstract

“…Indeed, stable isotope studies (Hodell & Venz 1992), and interpretations of siliceous microfossils (Bohaty & Harwood 1998, Whitehead et al 2005 indicate low sea ice concentrations and relatively high sea surface temperatures in the early Pliocene with a cooling trend occurring from the middle Pliocene onward. Previously, based on results from ODP Site 745 in the East Kerguelen sediment drift, Joseph et al (2002) had argued that a stable East Antarctic Ice Sheet had established itself during the middle Pliocene. However, they also found that enhanced sediment accumulation from a less stable, wet-based, East Antarctic glacial source occurred periodically as short-term events until the middle Pleistocene (Joseph et al 2002).…”

Section: Neogene Major Advance and Retreat Episodes Of The East Antarmentioning

confidence: 99%

“…Previously, based on results from ODP Site 745 in the East Kerguelen sediment drift, Joseph et al (2002) had argued that a stable East Antarctic Ice Sheet had established itself during the middle Pliocene. However, they also found that enhanced sediment accumulation from a less stable, wet-based, East Antarctic glacial source occurred periodically as short-term events until the middle Pleistocene (Joseph et al 2002).…”

Section: Neogene Major Advance and Retreat Episodes Of The East Antarmentioning

confidence: 99%

Recent advances in understanding Antarctic climate evolution

Siegert¹,

Barrett²,

DeConto³

et al. 2007

PAGES news

View full text Add to dashboard Cite

Geological evidence shows that the ice sheet and climate in Antarctica has changed considerably since the onset of glaciation around 34 million years ago. By analysing this evidence, important information concerning processes responsible for ice sheet growth and decay can be determined, which is vital for appreciating future changes in Antarctica. Geological records are diverse and their analyses require a variety of techniques. They are, however, essential for the establishment of hypotheses regarding past Antarctic changes. Numerical models of ice and climate are useful for testing such hypotheses, and in recent years there have been several advances in our knowledge relating to ice sheet history gained from these tests. This paper documents five case studies, employing a full range of techniques, to exemplify recent insights into Antarctic climate evolution from modelling ice sheet inception in the earliest Oligocene to quantifying Neogene ice sheet fluctuations and process-led investigations of recent (last glacial) changes.

show abstract

Antarctic environmental variability since the late Miocene: ODP Site 745, the East Kerguelen sediment drift

Cited by 34 publications

References 42 publications

Evidence for orbitally controlled size variations of the East Antarctic Ice Sheet during the late Miocene

Evidence for orbitally controlled size variations of the East Antarctic Ice Sheet during the late Miocene

Terrigenous flux and biogenic silica deposition at the Antarctic continental rise during the late Miocene to early Pliocene: implications for ice sheet stability and sea ice coverage

Recent advances in understanding Antarctic climate evolution

Contact Info

Product

Resources

About