Pan-African intraplate deformation in the northern Prince Charles Mountains, east Antarctica

Boger, Steven D.; Carson, Chris; Fanning, Christopher; Hergt, Janet; Wilson, C. W.; Woodhead, Jon

doi:10.1016/s0012-821x(01)00587-8

Cited by 80 publications

(53 citation statements)

References 43 publications

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“…suggested, on the basis of paleomagnetic data, that final Gondwana assembly did not occur until sometime in the 550-530 Ma interval. This is consistent with a number of new geologic findings dividing East Gondwana into several different blocks (Fitzsimons, 2000;Boger et al, 2002;. Figure 3 is adopted from and shows the position of the major continental blocks at 580 Ma.…”

Section: -560 Ma Reconstructions (Vendian Glaciations)supporting

confidence: 87%

“…The vestiges of the Rodinia supercontinent broke apart during the terminal Neoproterozoic and the timing of that breakup is broadly synchronous with the assembly of Gondwana Powell and Pisarevsky, 2002;Boger et al, 2002;Torsvik et al, 1996). The existence of a younger, ephemeral supercontinent called Panottia is dependent on the time of rift-drift transition between Laurentia and the elements of western Gondwana (traditionally Amazonia-Rio Plata) and the final assembly of Gondwana.…”

Section: -560 Ma Reconstructions (Vendian Glaciations)mentioning

confidence: 99%

See 1 more Smart Citation

Paleomagnetic Constraints on Neoproterozoic ‘Snowball Earth' Continental Reconstructions

Meert

Torsvik

2013

The Extreme Proterozoic: Geology, Geochemistry, and Climate

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Section: -560 Ma Reconstructions (Vendian Glaciations)supporting

confidence: 87%

Section: -560 Ma Reconstructions (Vendian Glaciations)mentioning

confidence: 99%

Paleomagnetic Constraints on Neoproterozoic ‘Snowball Earth' Continental Reconstructions

Meert

Torsvik

2013

The Extreme Proterozoic: Geology, Geochemistry, and Climate

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“…M 2b ages in the Lú rio Belt are generally compatible with ca. 530-510 Ma ages to the west, in the Zambesi-Lufilian Arc-Southern Irumide Belt systems (Vinyu et al 1999;John et al 2004;Johnson et al 2005) and the east (in a Gondwana reconstruction) in the Prydz Bay-Prince Charles mountains (Antarctica) enclaves (Boger et al 2002;Corvino et al 2008;Liu et al 2009). However, older M 2a -type ages (1600-570 Ma; cf.…”

Section: Differential Cooling and The Delamination Modelmentioning

confidence: 99%

Postcollisional High-Grade Metamorphism, Orogenic Collapse, and Differential Cooling of the East African Orogen of Northeast Mozambique

Ueda

Jacobs²,

Thomas³

et al. 2012

The Journal of Geology

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A B S T R A C TThe postcollisional tectonic development of northeast Mozambique and subsequent cooling from high-temperature metamorphism is delineated with an extensive new set of U-Pb titanite, 40 Ar/ 39 Ar hornblende, and 40 Ar/ 39 Ar mica analyses. The complex data suggest a polyphase metamorphic history from the late Neoproterozoic to the Ordovician within the East African-Antarctic Orogen (EAAO), with marked differences between the major constituent blocks. In all the data sets, samples from the basement south of the Lú rio Belt show generally younger ages than those from the north, resulting from a late metamorphic event and slow cooling between ca. 520 and 440 Ma. The ages north and south of the Lú rio Belt are consistently offset by ca. 30-70 Ma, a difference that is maintained and even appears to increase during cooling from very high temperatures to ca. 350ЊC. Based on the first-order assumption that all the ages are cooling ages, cooling rates in the south are estimated at ca. 7Њ-8ЊC/Ma, while those north of the Lú rio Belt are faster at ca. 16ЊC/Ma. The data are consistent with previous geochronological, petrographic, and field data and suggest a late high-temperature/low-pressure metamorphic event that affected only the basement rocks south of the Lú rio Belt and portions of the latter. This late metamorphism and subsequent delayed, slower cooling agree well with a model of elevated heat flow following lithosphere delamination in the southern part of the orogen, which also explains the observed widespread granitoid magmatism, migmatization, and renewed deformation in the southern basement.

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“…These rocks underwent a multistage tectono-metamorphic history with granulitefacies events at 3000, 2500 and 1100 Ma (e.g., Sheraton, 1984). Both Prydz Bay and the PCM were overprinted by a main metamorphic episode of Pan-African age (540-490 Ma/ e.g., Boger et al, 2002). th International Symposium on Antarctic Earth Sciences…”

Section: Geological Overviewmentioning

confidence: 99%

Denudation and uplift of the Mawson Escarpment (eastern Lambert Graben, Antarctica) as indicated by apatite fission track data and geomorphological observation

Lisker

Gibson²,

Wilson³

et al. 2007

Open-File Report

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Analysis of three vertical profiles from the southern Mawson Escarpment (Lambert Graben) reveals apatite fission track (AFT) ages ranging from 102±20 to 287±23 Ma and mean lengths of 12.2 to 13.0 µm. Quantitative thermal histories derived from these data consistently indicate onset of slow cooling below 110°C began sometime prior to 300 Ma, and a second stage of rapid cooling from paleotemperatures up to ≤100°C to surface temperatures occurred in the Late Cretaceous -Paleocene. The first cooling phase refers to Carboniferous -Jurassic basement denudation up to 5 km associated with the initial rifting of the Lambert Graben. The presence of the ancient East Antarctic Erosion Surface and rapid Late Cretaceous -Paleocene cooling indicate a second denudational episode during which up to 4.5 km of sedimentary cover rocks were removed, and that is likely linked to the Cretaceous Gondwana breakup between Antarctica and India and subsequent passive continental margin formation.

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Pan-African intraplate deformation in the northern Prince Charles Mountains, east Antarctica

Cited by 80 publications

References 43 publications

Paleomagnetic Constraints on Neoproterozoic ‘Snowball Earth' Continental Reconstructions

Paleomagnetic Constraints on Neoproterozoic ‘Snowball Earth' Continental Reconstructions

Postcollisional High-Grade Metamorphism, Orogenic Collapse, and Differential Cooling of the East African Orogen of Northeast Mozambique

Denudation and uplift of the Mawson Escarpment (eastern Lambert Graben, Antarctica) as indicated by apatite fission track data and geomorphological observation

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