Granitoids of northern Victoria Land, Antarctica; implications of chemical and isotopic variations to regional crustal structure and tectonics

Borg, Scott G.; Stump, Edmund; Chappell, B. W.; McCulloch, Malcolm T.; Wyborn, D.; Armstrong, R. L.; Holloway, J. R.

doi:10.2475/ajs.287.2.127

Cited by 134 publications

(85 citation statements)

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“…1). Metasedimentary, metavolcanic, and granitic rocks of the pre-Devonian basement of the TAM define the Ross Orogen, which developed along the margin of the East Antarctic Craton during the late Precambrian to early Paleozoic (Laird et al 1971;Borg et al 1987 al. 1993a,b;Cox 1993;Encarnacion & Grunow 1996;Cox et al 2000).…”

Section: Introductionmentioning

confidence: 99%

Geology, geochemistry, and geochronology of an A‐type granite in the Mulock Glacier area, southern Victoria Land, Antarctica

Cottle

Cooper²

2006

New Zealand Journal of Geology and Geophysics

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Section: Introductionmentioning

confidence: 99%

Geology, geochemistry, and geochronology of an A‐type granite in the Mulock Glacier area, southern Victoria Land, Antarctica

Cottle

Cooper²

2006

New Zealand Journal of Geology and Geophysics

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“…The Ross Orogen in Northern Victoria Land and the Delamerian Belt in southeastern Australia have similar features, such as a lowpressure, high-temperature metamorphic belt (Dymoke and Sandiford, 1992;Talarico et al, 1992) with syn-to post-tectonic magmaticarc granitoids (Borg et al, 1987;Armienti et al, 1990;Rocchi et al, 2004;Foden et al, 2006) and a high P belt (Ricci et al, 1996Talarico et al, 1998;Watanabe et al, 1997;Och et al, 2003).…”

Section: Comparison Between Tasmania and Antarctica High-pressure Rocmentioning

confidence: 98%

Petrology of the eclogites from western Tasmania: Insights into the Cambro-Ordovician evolution of the paleo-Pacific margin of Gondwana

Palmeri

Chmielowski

Sandroni

et al. 2009

Lithos

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Eclogite facies rocks along the Paleozoic active margin of Gondwana are rare. They are limited to isolated segments of Northern Victoria Land (Antarctica), western Tasmania, and southeastern Australia. New petrological data for mafic rocks and their host garnet-kyanite schists from the Franklin Metamorphic Complex (western Tasmania) permit reconstruction of six main stages of mineral growth for the eclogite. Stages I and II occurred at greenschist/ amphibolite-facies conditions (ca. 500-600°C; 0.55-0.7 GPa for stage II) before attaining high-pressure conditions (at ≈600-650°C; N 1.5 GPa for stage III). The following stages, IV and V, record the decompression from high-pressure conditions to amphibolite-facies (ca. 500-600°C; 0.4-1.0 GPa). Finally, stage VI represents the late greenschist-facies retrogression. However, the pelitic schist surrounding the eclogite records only the mediumpressure amphibolite-facies stage. The P-T evolution over time outlines a clockwise path that is quite steep in both the prograde and retrograde segments. The latter shows a nearly isothermal decompression between the eclogite and the high-pressure amphibolite-facies stage IV, which was achieved at deep crustal levels (≈30 km), and a final decrease in both pressure and temperature from deep/intermediate to shallow crustal levels, with a typical cooling-unloading path. The lack of a complete re-equilibration during the different stages and the high dP/dT for both the prograde and retrograde paths are indicative of a rapid burial and initially rapid exhumation. The similarity of the mafic whole-rock chemical composition, including N, T to E-MORB and of the peak metamorphic age (≈500 Ma) between the Tasmanian eclogites and the UHP rocks from Northern Victoria Land, supports the idea that they formed in the context of the same contractional event. However, the different P-T conditions and dP/dT point to different tectono-metamorphic settings for the two sectors of the paleo-Pacific margin of Gondwana during the Ross/Tyennan orogeny.

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“…Then between 505-490 Ma voluminous magmatism intruded large regions throughout the TAM (Borg 1983;Borg et al 1987;Allibone et al 1993a,b;Allibone and Wysoczanski 2002). The magmatism overlapped the latter stages of deformation and continued post-tectonically.…”

Section: -490 Mamentioning

confidence: 99%

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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Granitoids of northern Victoria Land, Antarctica; implications of chemical and isotopic variations to regional crustal structure and tectonics

Cited by 134 publications

References 0 publications

Geology, geochemistry, and geochronology of an A‐type granite in the Mulock Glacier area, southern Victoria Land, Antarctica

Geology, geochemistry, and geochronology of an A‐type granite in the Mulock Glacier area, southern Victoria Land, Antarctica

Petrology of the eclogites from western Tasmania: Insights into the Cambro-Ordovician evolution of the paleo-Pacific margin of Gondwana

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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