A geological reconnaissance of the Radok Lake area, Amery Oasis, Prince Charles Mountains

McKelvey, B. C.; Stephenson, N. C. N.

doi:10.1017/s0954102090000062

Cited by 59 publications

(47 citation statements)

References 11 publications

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“…At Radok Lake, in the northern Prince Charles mountains southwest of Prydz Bay, McKelvey and Stephenson (1990) report that an irregular blanket of the Pagodroma Tillite, up to 100 m thick, overlies Permian strata and Proterozoic basement at elevations 400 to 1300 m above present sea level. D. M. Harwood (in McKelvey and Stephenson, 1990) reports the presence of both reworked upper Miocene and a middle Pliocene diatom floras in the Pagodroma Tillite, and he assigns an age of no older than 3.5 Ma, or roughly contemporaneous with the Sirius Group of the Transantarctic Mountains.…”

Section: Summary Of the Neogene Glacial Historymentioning

confidence: 99%

Evidence for Late Eocene to Early Oligocene Antarctic Glaciation and Observations on Late Neogene Glacial History of Antarctica: Results from Leg 119

Barron¹,

Larsen²,

Baldauf³

1991

Proceedings of the Ocean Drilling Program

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Although scientific evidence prior to that from ODP Leg 119 indicates the presence of an ice sheet on East Antarctica by at least the earliest Oligocene, the question as to the size and stability of that initial ice sheet is still contested. Current hypotheses include (1) the presence of a small ice sheet in the earliest Oligocene with stepwise growth during the Neogene, (2) the presence of a continental-sized ice sheet in the late middle Eocene with no major evidence of subsequent deglaciation, and (3) the presence of glacial ice in the earliest Oligocene with a major ice sheet during the midOligocene, followed by growth and decay of several ice sheets with characteristics similar to the temperate ice sheets of the Pleistocene of North America but with changes over a longer time scale (millions of years vs. 100,000 yr).Principal results from Leg 119 suggest the presence of significant late middle and late Eocene glaciation in East Antarctica and the presence of a continental-size ice sheet in East Antarctica during the earliest Oligocene. Although the Leg 119 results provide only glimpses of the Neogene glacial history of East Antarctica, they do provide evidence of fluctuations in the extent of the ice sheet and the waxing and waning of glaciers across the Prydz Bay shelf during the later part of the late Miocene and Pliocene.

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Section: Summary Of the Neogene Glacial Historymentioning

confidence: 99%

Evidence for Late Eocene to Early Oligocene Antarctic Glaciation and Observations on Late Neogene Glacial History of Antarctica: Results from Leg 119

Barron¹,

Larsen²,

Baldauf³

1991

Proceedings of the Ocean Drilling Program

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“…Burckle and Pokras, 1991;Webb and Harwood, 1991;Kennett and Hodell, 1993;Sugden et al, 1993;Wilson, 1995;Kellogg and Kellogg, 1996;Barrett et al, , 1997Miller and Mabin, 1998). They, along with glacigene strata in the Prince Charles Mountains (McKelvey and Stephenson, 1990;Hambrey and McKelvey, 2000), comprise the extent of the currently known Cenozoic stratigraphic record exposed on the Antarctic craton. Mayewski (1975) mapped and correlated Cenozoic glacigene strata throughout the Transantarctic Mountains and proposed that these deposits all be grouped within the Sirius Formation (later elevated to Group by McKelvey et al, 1987McKelvey et al, , 1991.…”

Section: Introductionmentioning

confidence: 99%

The Mount Feather Diamicton of the Sirius Group: an accumulation of indicators of Neogene Antarctic glacial and climatic history

Wilson

Barron

Ashworth

et al. 2002

Palaeogeography, Palaeoclimatology, Palaeoecology

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A paucity of data from the Antarctic continent has resulted in conflicting interpretations of Neogene Antarctic glacial history. Much of the debate centres on interpretations of the glacigene Sirius Group strata that crop out as discrete deposits along the length of the Transantarctic Mountains and in particular on its age and the origin of the siliceous microfossils it encloses. Pliocene marine diatoms enclosed within Sirius Group strata are inferred to indicate a dynamic East Antarctic ice sheet that was much reduced, compared with today, in the early^middle Pliocene and then expanded again in the late Pliocene. However, the geomorphology of the Dry Valleys region is interpreted to represent a relatively long-lived (middle Miocene^recent) and stable polar climatic regime similar to that of today. Mount Feather Diamicton infills a palaeovalley at ca. 2500 m on the NE flank of Mount Feather in the Dry Valleys region and has been included within the Sirius Group. We obtained four shallow cores (COMRAC 8, 9, 10 and 11) from beneath the permafrost boundary in the Mount Feather Diamicton in order to understand its origin and relationship with the surrounding landscape. Detailed studies of these cores (stratigraphy, sedimentology, palaeontology, micromorphology, petrography and fabric) have yielded new data that demonstrate a much more complex climatic and glacial history for the Mount Feather Diamicton than in previous interpretations. The data indicate that the Mount Feather Diamicton was deposited beneath a wet based glacier fed from a larger ice sheet behind the Transantarctic Mountains. It is, however, unlikely that this ice sheet overtopped Mount Feather (2985 m). A near-in situ non-marine diatom assemblage was recovered from 90 cm depth in COMRAC 10 and indicates a maximum depositional age of Late Miocene for the Mount Feather Diamicton. A subsequent glacial episode has distributed a boulder blanket across the surface of the diamicton. Other post-depositional processes include drying, infilling of surface layers with aeolian sediment, and the development of melt-water runnels. We interpret these combined data to indicate the persistence of more temperate climatic and glacial conditions in the vicinity of Mount Feather until at least the Late Miocene. ß

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“…The Permian-Triassic subarkosic sandstones (groups III and IV) are well represented, comprising 12% of the entire clast collection. Rocks of similar age are exposed in the Beaver Lake area, Northern Prince Charles Mountains (Mond, 1972;Tingey, 1982;McKelvey and Stephenson, 1990), consistent with a Lambert Glacier ice provenance. It is possible that similar rocks underlie the Lambert Glacier.…”

Section: Sedimentary Unitsmentioning

confidence: 75%

“…On the other hand, we find some puzzling omissions from the lithology represented, such as the mafic intrusive rocks that are common throughout the Prince Charles Mountains (Mond, 1972;McKelvey and Stephenson, 1990) and Vestfold Hills and the cordierite-bearing ("blue") gneisses of the Vestfold Hills and Larsemann Hills (Stuwe et al, 1989;Harley, 1987). Although coal was not represented as actual clasts, disseminated coaly materials were present in the diamictons.…”

Section: Sedimentary Unitsmentioning

confidence: 78%

“…Information on the distribution and characteristics of geological units in East Antarctica is available in Mond (1972), Grew (1982), Oliver et al, (1982), Tingey (1982), Harley (1987), Sheraton and Black (1988), Stuwe et al (1989), Hambrey et al (1989), andMcKelvey andStephenson (1990). The typical lithology of group I (e.g., ts90; PI.…”

Section: Geological Settingmentioning

confidence: 99%

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Sedimentary and Metamorphic Rock Clasts from the Cenozoic Diamictons of Sites 738-743 in Prydz Bay, East Antarctica

Jenkins¹,

Alibert²

1991

Proceedings of the Ocean Drilling Program

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Petrographic studies of clasts in the glacial diamictons of Prydz Bay indicate that the predominant ice supply was from the Lambert Glacier (Prince Charles Mountains and Lambert Graben regions); no compelling evidence is seen for clastic supply from the Vestfold Hills and Larsemann Hills areas. The clasts also reveal the presence in East Antarctica of (1) an early Oligocene-late Eocene (34-36 Ma) diatomaceous marine marl facies and (2) a Jurassic-Cretaceous sandy limestone lithofacies, possibly of subaerial origin.

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A geological reconnaissance of the Radok Lake area, Amery Oasis, Prince Charles Mountains

Cited by 59 publications

References 11 publications

Evidence for Late Eocene to Early Oligocene Antarctic Glaciation and Observations on Late Neogene Glacial History of Antarctica: Results from Leg 119

Evidence for Late Eocene to Early Oligocene Antarctic Glaciation and Observations on Late Neogene Glacial History of Antarctica: Results from Leg 119

The Mount Feather Diamicton of the Sirius Group: an accumulation of indicators of Neogene Antarctic glacial and climatic history

Sedimentary and Metamorphic Rock Clasts from the Cenozoic Diamictons of Sites 738-743 in Prydz Bay, East Antarctica

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