The geology of Buckley and Darwin Nunataks, Beardmore Glacier, Ross Dependency, Antarctica

Young, D. J.; Ryburn, R.J.

doi:10.1080/00288306.1968.10420761

Cited by 15 publications

(5 citation statements)

References 5 publications

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“…Other faults have an order of magnitude less displacement: a W-facing monocline/fault lies parallel to, and east of, the Marsh Fault and displaces Victoria Group strata by about 350 m (Barrett, Elliot & Lindsay, 1986); the fault at the Moore Mountains is illustrated (Barrett, Lindsay & Gunner, 1970) as normal down to the west, and is projected into the monoclinal structure at Mount Weeks. An unexamined monocline facing east is present in the Dominion Range (Elliot, Barrett & Mayewski, 1974) and may lie along strike from the dipping basal Permian strata at Mount Bowers (Young & Ryburn, 1968; Elliot, Fanning & Hulett, 2014). A NW–SE-striking small graben with offset of a few hundred metres is situated in the southern Marshall Mountains (Barrett & Elliot, 1973); a fault down to the west cuts Coalsack Bluff, displacing upper Buckley beds and lower Fremouw strata (Collinson & Elliot, 1984); and an uplifted isolated fault block of north-dipping lower Permian strata overlying Cambrian limestone, demonstrating some 500 m of uplift, is present just to the west of Coalsack Bluff.…”

Section: Hanson Formationmentioning

confidence: 99%

The Lower Jurassic Hanson Formation of the Transantarctic Mountains: implications for the Antarctic sector of the Gondwana plate margin

et al. 2016

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The Hanson Formation, Antarctica, consists of interbedded sandstones and tuffaceous rocks of Early Jurassic age. The sandstones, pebbly to medium-grained, range between quartzo-feldspathic and volcaniclastic, with some of the former being coarse-grained arkoses that imply proximal sources. Geochronology of detrital zircons provides evidence for source rock ages, whereas sandstone petrology demonstrates a mixed provenance. Tuffaceous strata are reworked fine to very fine-grained tuffs resulting from distal Plinian eruptions. Dated tuffs provide time constraints on the duration of volcanism. The sandstones and tuffs accumulated in a rift environment. Geochemically the tuffs are rhyolitic in composition, and the Sr and Nd isotope data together with the patterns on multi-element diagrams suggest they were derived from a volcanic arc, which is interpreted to have been located along the West Antarctic Gondwana margin. The silicic volcanism extends the distribution and timing of magmatism in the Early Jurassic along that margin. The Early Jurassic extensional regime was delimited by the plate margin region and the East Antarctic craton. The rift valley system along the East Antarctic craton margin, in which the Hanson strata accumulated, was the focus for subsequent emplacement of the intrusive and extrusive rocks of the Lower Jurassic Ferrar Large Igneous Province. The Early Jurassic extensional rifts may have been reactivated during Cretaceous–Cenozoic development of the West Antarctic Rift System.

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Section: Hanson Formationmentioning

confidence: 99%

The Lower Jurassic Hanson Formation of the Transantarctic Mountains: implications for the Antarctic sector of the Gondwana plate margin

et al. 2016

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“…The Byrd Group consists of Early Cambrian Shackleton Limestone, and the overlying Starshot Formation and Douglas Conglomerate (Myrow et al 2002). Shackleton Limestone crops out extensively from Byrd Glacier to south of Nimrod Glacier (Grindley 1963, Laird 1963, 1964, Skinner 1964, 1965, Young & Ryburn 1968, Laird et al 1971) (Fig. 1).…”

Section: Geological Setting and Previous Workmentioning

confidence: 99%

First evidence of a “Barrovian”-type metamorphic regime in the Ross orogen of the Byrd Glacier area, central Transantarctic Mountains

et al. 2007

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The Selborne Group comprises two metamorphic rock units, the muscoviteAEdolomite bearing Madison Marble and the biotite-muscoviteAEquartz-calcite Contortion Schist, which contains thick lenses of variably deformed metabasalts and metaconglomerates. Petrological and structural data indicate a polyphase metamorphic evolution including: i) an early stage of upper greenschist regional metamorphism (P ¼ $0.15 -0.3 GPa; T ¼ $380-4508C), ii) prograde metamorphism during D 1 up to amphibolite facies peak conditions (P ¼ 0.58 -0.8 GPa, T ¼ $560 -6458C), iii) syn-D 2 unloading-cooling retrograde metamorphism, iv) a post-D 2 contact metamorphic overprint at variable T between 450 and 5508C and $0.2 GPa connected to the emplacement of granitic plutons and felsic dyke swarms. Geochronological data constrain the polyphase syn-D 1 /D 2 evolution between $ 510 and 492 Ma. A similar metamorphic path, including a medium P stage but at lower T conditions, is documented in greenschist facies metabasalts within the Byrd Group in the Mount Dick area. The metamorphic pattern and close lithostratigraphic matching between Selborne Group and Byrd Group sharply contrast with the high-grade Horney Formation that is exposed north of the Byrd Glacier and corroborate the hypothesis that the Byrd Glacier discontinuity marks a first-order crustal tectonic boundary crossing the Ross orogen.

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“…931-2) as "quartz sandstone". Although quartz is the dominant mineral in most sandstones in Grindley's type section of the Buckley Coal Measures 10 to 20 km north-west of Buckley Island, and in equivalent beds throughout the Beardmore Glacier area, these sandstones are better described as arkoses and subarkoses (Table 1, and Grindley, 1963 Young and Ryburn (1968). Formation names are defined in Barrett (in press b).…”

mentioning

confidence: 99%

“…12 GEOLOGY OF BUCKLEY ISLAND, ANTARCTICA Sir, I would like to comment on two points raised by Young and Ryburn's (1968) paper on the geology of Buckley Island in the last special Antarctic issue of this journal. The first is the spelling of "McKellar" where the name was used for a formation in the Beardmore Glacier area.…”

mentioning

confidence: 99%

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Letter to the editor: Geology of Buckley Island, Antarctica

Barrett

1969

New Zealand Journal of Geology and Geophysics

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The geology of Buckley and Darwin Nunataks, Beardmore Glacier, Ross Dependency, Antarctica

Cited by 15 publications

References 5 publications

The Lower Jurassic Hanson Formation of the Transantarctic Mountains: implications for the Antarctic sector of the Gondwana plate margin

The Lower Jurassic Hanson Formation of the Transantarctic Mountains: implications for the Antarctic sector of the Gondwana plate margin

First evidence of a “Barrovian”-type metamorphic regime in the Ross orogen of the Byrd Glacier area, central Transantarctic Mountains

Letter to the editor: Geology of Buckley Island, Antarctica

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