Correlation of Byrd and Selborne Groups, with implications for the Byrd Glacier discontinuity, central Transantarctic Mountains, Antarctica

Stump, Edmund; Gootee, Brian F.; Talarico, F.; Schmus, W. R. Van; Brand, P.K.; Foland, K. A.; Fanning, C. Mark

doi:10.1080/00288306.2004.9515045

Cited by 21 publications

(42 citation statements)

References 23 publications

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“…By the beginning of the Atdabanian (525 Ma), erosion had occurred across the accreted, inboard side of the Beardmore microcontinent and deposition of an east-facing carbonate bank (Shackleton Limestone) had commenced (Rees et al 1989;Gootee and Stump 2006 this vol.). More than 2 000 meters of carbonate deposition continued through most of the Botomian under quiescent conditions (Stump et al 2004). That this carbonate basin existed without tectonic effects through this period may be owing to its location at the postulated reentrant to the previously rifted margin.…”

Section: -512 Ma Atdabanian-upper Botomianmentioning

confidence: 99%

“…In the Holyoake Range, Starshot Formation contains upper Botomian trilobites and is conformably interbedded with Douglas Conglomerate (Myrow et al 2002a). In the area immediately to the south of Byrd Glacier, clastic and carbonate units interfinger conformably, and the interval is marked by pillow basalts (Stump et al 2004). A tuff in Shackleton Limestone 50 meters beneath the first, overlying clastic unit has been U-Pb zircon dated as 512 ±5 Ma (Stump et al 2004).…”

Section: Mamentioning

confidence: 99%

“…In the area immediately to the south of Byrd Glacier, clastic and carbonate units interfinger conformably, and the interval is marked by pillow basalts (Stump et al 2004). A tuff in Shackleton Limestone 50 meters beneath the first, overlying clastic unit has been U-Pb zircon dated as 512 ±5 Ma (Stump et al 2004). Paleocurrent indicators signal a western source in the Holyoake and Surveyors Ranges (Myrow et al 2002a,b).…”

Section: Mamentioning

confidence: 99%

“…Our current research is aimed at understanding the tectonic discontinuity followed by Byrd Glacier. Research to the south of Byrd Glacier was begun during the 2000/2001 field season, with results presented elsewhere (Gootee 2002;Stump et al 2002b;Stump et al 2004). The following model may serve as a working hypothesis at this stage of our research.…”

Section: Tectonic Modelmentioning

confidence: 99%

“…Shackleton Limestone was eroded, providing a majority of the clasts for the Douglas, which is seen in unconformable contact with Shackleton at two localities (Rowell et al 1988;Stump et al 2004). Throughout the Holyoake Range and Churchill Mountains, the trends of folding and thrust faulting are primarily oriented N-S (Laird et al 1971;Myrow et al 2002a,b), whereas in the area immediately south of Byrd Glacier fold trends are ENE parallel to the glacier (Skinner 1964;Stump et al 2004). We suggest that this pattern reflects a reactivation of the western and northern, sutured boundaries between the Beardmore microcontinent and the cratonic margin at the promontory along Byrd Glacier.…”

Section: -500 Mamentioning

confidence: 99%

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Tectonic Model for Development of the Byrd Glacier Discontinuity and Surrounding Regions of the Transantarctic Mountains during the Neoproterozoic — Early Paleozoic

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Abstract. The Byrd Glacier discontinuity is a major tectonic boundary crossing the Ross Orogen, with crystalline rocks to the north and primarily sedimentary rocks to the south. Most models for the tectonic development of the Ross Orogen in the central Transantarctic Mountains consist of two-dimensional transects across the belt, but do not address the major longitudinal contrast at Byrd Glacier. This paper presents a tectonic model centering on the Byrd Glacier discontinuity. Rifting in the Neoproterozoic produced a crustal promontory in the craton margin to the north of Byrd Glacier. Oblique convergence of a terrane (Beardmore microcontinent) during the latest Neoproterozoic and Early Cambrian was accompanied by subduction along the craton margin of East Antarctica. New data presented herein in support of this hypothesis are U-Pb dates of 545.7 ±6.8 Ma and 531.0 ±7.5 Ma on plutonic rocks from the Britannia Range, directly north of Byrd Glacier. After docking of the terrane, subduction stepped out, and Byrd Group was deposited during the Atdabanian-Botomian across the inner margin of the terrane. Beginning in the upper Botomian, reactivation of the sutured boundaries of the terrane resulted in an outpouring of clastic sediment and folding and faulting of the Byrd Group.

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Section: -512 Ma Atdabanian-upper Botomianmentioning

confidence: 99%

Section: Mamentioning

confidence: 99%

Section: Mamentioning

confidence: 99%

Section: Tectonic Modelmentioning

confidence: 99%

Section: -500 Mamentioning

confidence: 99%

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Tectonic Model for Development of the Byrd Glacier Discontinuity and Surrounding Regions of the Transantarctic Mountains during the Neoproterozoic — Early Paleozoic

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Depositional Environments of the Byrd Group, Byrd Glacier Area: A Cambrian Record of Sedimentation, Tectonism, and Magmatism

Gootee

Stump

Antarctica

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Early Miocene Antarctic glacial history: new insights from heavy mineral analysis from ANDRILL AND-2A drill core sediments

Iacoviello

Giorgetti

Memmi

et al. 2014

Int J Earth Sci (Geol Rundsch)

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The present study deals with heavy mineral analysis of late Early Miocene marine sediments recovered in the McMurdo Sound region (Ross Sea, Antarctica) during the ANDRILL-SMS Project in 2007. The main objective is to investigate how heavy mineral assemblages reflect different source rocks and hence different provenance areas. These data contribute to a better understanding of East Antarctica ice dynamics in the Ross Sea sector during the Early Miocene (17.6-20.2 Ma), a time of long-term global warming and sea level rise. The AND-2A drill core recovered several stratigraphic intervals that span from Early Miocene to Pleistocene and it collected a variety of terrigenous lithologies. The heavy mineral assemblages of the lower 650-m-thick sedimentary succession were analyzed through SEM observations and SEM-EDS microanalyses on heavy mineral grains. The heavy mineral analysis shows that the sediments are a mix of detritus dominated by McMurdo Volcanic Group sources most likely located in the present-day Mount Morning area (Proto-Mount Morning) with minor contribution from Transantarctic Mountains source rocks located west of the drill site. The heavy mineral assemblages in Interval 1 indicate that between 20.2 and 20.1 Ma, the grounding line of the ice sheet advanced to a position near the present-day Mount Morning volcanic center. During deposition of Interval 2 (20.1-19.3 Ma), the ice sheet most likely experienced a dynamic behavior with interval of ice advance alternating with periods of ice retreat, while Interval 3 (19.3-18.7 Ma) records further retreat to open water conditions. A dynamic behavior is noted in Interval 4 (18.7-17.6 Ma) with a decreasing contribution of materials derived from the basalts of the Mount Morning volcanic center located to the south of the drill site and a consequent increasing contribution of materials derived from the Transantarctic Mountains to the west of the drill site.

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Correlation of Byrd and Selborne Groups, with implications for the Byrd Glacier discontinuity, central Transantarctic Mountains, Antarctica

Cited by 21 publications

References 23 publications

Tectonic Model for Development of the Byrd Glacier Discontinuity and Surrounding Regions of the Transantarctic Mountains during the Neoproterozoic — Early Paleozoic

Tectonic Model for Development of the Byrd Glacier Discontinuity and Surrounding Regions of the Transantarctic Mountains during the Neoproterozoic — Early Paleozoic

Depositional Environments of the Byrd Group, Byrd Glacier Area: A Cambrian Record of Sedimentation, Tectonism, and Magmatism

Early Miocene Antarctic glacial history: new insights from heavy mineral analysis from ANDRILL AND-2A drill core sediments

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