Late Cenozoic Climate History of the Ross Embayment from the AND-1B Drill Hole: Culmination of Three Decades of Antarctic Margin Drilling

Naish, T.; Powell, Ross D.; Barrett, P. J.; Levy, R. H.; Henrys, Stuart; Wilson, Gary; Krissek, L. A.; Niessen, Frank; Pompilio, M.; Ross, Jake; Scherer, Reed P.; Talarico, F.; Pyne, Alex

doi:10.3133/ofr20071047kp07

Cited by 26 publications

(41 citation statements)

References 33 publications

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“…During the austral summer of 2006-2007, the Antarctic Drilling Program (ANDRILL) successfully drilled a borehole, AND-1B, beneath the McMurdo Ice Shelf (Naish et al, 2007a). The ice cover was ~82 m thick and water depth was 855 m. Total depth of the borehole reached 1285 m below seafl oor (mbsf) with 98 percent core recovery of sedimentary rocks for detailed study of climate and ice-sheet dynamics (Naish et al, 2007b).…”

Section: Introductionmentioning

confidence: 99%

Heat Flow and Hydrologic Characteristics at the AND-1B borehole, ANDRILL McMurdo Ice Shelf Project, Antarctica

et al. 2010

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TheAntarctic Drilling Program (ANDRILL) successfully drilled and cored a borehole, AND-1B, beneath the McMurdo Ice Shelf and into a fl exural moat basin that surrounds Ross Island. Total drilling depth reached 1285 m below seafl oor (mbsf) with 98 percent core recovery for the detailed study of glacier dynamics. With the goal of obtaining complementary information regarding heat fl ow and permeability, which is vital to understanding the nature of marine hydrogeologic systems, a succession of three temperature logs was recorded over a fi veday span to monitor the gradual thermal recovery toward equilibrium conditions. These data were extrapolated to true, undisturbed temperatures, and they defi ne a linear geothermal gradient of 76.7 K/km from the seafl oor to 647 mbsf. Bulk thermal conductivities of the sedimentary rocks were derived from empirical mixing models and density measurements performed on core, and an average value of 1.5 W/mK ± 10 percent was determined. The corresponding estimate of heat fl ow at this site is 115 mW/m 2 . This value is relatively high but is consistent with other elevated heat-fl ow data associated with the Erebus Volcanic Province. Information regarding the origin and frequency of pathways for subsurface fl uid fl ow is gleaned from drillers' records, complementary geophysical logs, and core descriptions. Only two prominent permeable zones are identifi ed and these correspond to two markedly different features within the rift basin; one is a distinct lithostratigraphic subunit consisting of a thin lava fl ow and the other is a heavily fractured interval within a single thick subunit.

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Section: Introductionmentioning

confidence: 99%

Heat Flow and Hydrologic Characteristics at the AND-1B borehole, ANDRILL McMurdo Ice Shelf Project, Antarctica

et al. 2010

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“…3. Cyclic variations in deposition units (facies) and chronostratigraphic constraints link ice sheet extent to orbitalscale climate cycles that appear to be ~40 kyr duration during the Pliocene (5.3-1.8 Myr ago) (Naish et al, 2008). Our data provide the first direct evidence of orbitally controlled oscillations of a marine-based ice sheet (cf., Raymo and Huybers, 2008) in Ross Embayment, which periodically contracted onto terrestrial Antarctica when planetary temperatures were up to ~3°C warmer than today and atmospheric pCO 2 may have been 400 ppm.…”

Section: Late Cenozoic Antarctic Climate and Global Implicationsmentioning

confidence: 61%

New records of the role of Antarctic ice sheets in late Cenozoic climate

Powell¹,

Naish²,

Levy³

2009

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“…Such a search may be in vain, since the new SST data at ODP Site 1088 suggest that in the case of an operant bipolar seesaw in the Messinian much of the melting may have been located in the Northern Hemisphere, where the presence of IRD at the TG12-TG11 transition will also need to be confirmed. If the suggestion that a large scale deglaciation occurring in the Northern hemisphere is confirmed, it would support the proposal, based on evidence on the Antarctic Peninsula, that although parts of the glacial cover in Antarctica have fluctuated in thickness, the ice sheet became progressively thicker toward the present, with no clear evidence for complete melting during the last 7.5 Ma (Smellie et al, 2008) (Naish et al, (2008). However, this result cannot exclude the possibility of smaller scale melting events after the late Miocene.…”

Section: Discussionmentioning

confidence: 91%

Insight into the latest Messinian (5.7–5.2Ma) palaeoclimatic events from two deep-sea Atlantic Ocean ODP Sites

Vautravers

2014

Palaeogeography, Palaeoclimatology, Palaeoecology

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Abstract:The results of a multi-proxy study, including quantitative planktonic foraminifera faunal analysis, geochemistry of foraminifera tests, and lithogenic counts (IRD) Highlights: Major oceanographic/climatologic event at the Late Messinian TG12/TG11 transition. Potential for a pre-Quaternary seesaw mechanism. Location of the ice-sheet capable of producing a large deglaciation to be identified.

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Late Cenozoic Climate History of the Ross Embayment from the AND-1B Drill Hole: Culmination of Three Decades of Antarctic Margin Drilling

Cited by 26 publications

References 33 publications

Heat Flow and Hydrologic Characteristics at the AND-1B borehole, ANDRILL McMurdo Ice Shelf Project, Antarctica

Heat Flow and Hydrologic Characteristics at the AND-1B borehole, ANDRILL McMurdo Ice Shelf Project, Antarctica

New records of the role of Antarctic ice sheets in late Cenozoic climate

Insight into the latest Messinian (5.7–5.2Ma) palaeoclimatic events from two deep-sea Atlantic Ocean ODP Sites

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