Isotopic constraints on Pan-African metamorphism in Dronning Maud Land, Antarctica

Moyes, A.B.; Groenewald, P. B.

doi:10.1016/0009-2541(95)00150-6

Cited by 28 publications

(11 citation statements)

References 16 publications

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“…All of the errors reported in this study are reported at 2r, which represents a 95% confidence limit. Applicable errors are reportedly 0.5% for 87 Rb/ 86 Sr and 0.2% for 147 Sm/ 144 Nd, 0.01% for measured 87 Sr/ 86 Sr, and 0.005% for measured 143 Nd/ 144 Nd (Buchanan et al, 2004;Moyes and Groenewald, 1996). Fig.…”

Section: Rb/sr and Sm/nd Radiogenic Isotope Techniquesmentioning

confidence: 90%

New SHRIMP, Rb/Sr and Sm/Nd isotope and whole rock chemical data from central Mozambique and western Dronning Maud Land, Antarctica: Implications for the nature of the eastern margin of the Kalahari Craton and the amalgamation of Gondwana

Grantham

Manhica

Armstrong

et al. 2011

Journal of African Earth Sciences

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Section: Rb/sr and Sm/nd Radiogenic Isotope Techniquesmentioning

confidence: 90%

New SHRIMP, Rb/Sr and Sm/Nd isotope and whole rock chemical data from central Mozambique and western Dronning Maud Land, Antarctica: Implications for the nature of the eastern margin of the Kalahari Craton and the amalgamation of Gondwana

Grantham

Manhica

Armstrong

et al. 2011

Journal of African Earth Sciences

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“…However, geothermometry and geobarometry calculations involving garnet from similar terranes indicate that the Pan-African orogeny attained lower granulite-to amphibolite-facies metamorphic conditions (e.g. Moyes and Groenewald 1996). Thermobarometric calculations on the Geba and Baro gneisses, Western Ethiopian Shield, yield mid-to upper-amphibolite facies conditions (T = 650-700°C, P = 7-10 kbar; e.g.…”

Section: Implications From Zircon Age Datamentioning

confidence: 98%

Zircon and titanite age evidence for coeval granitization and migmatization of the early Middle and early Late Proterozoic Saharan Metacraton; example from the central North Sudan basement

Shang

Satır

Morteani

et al. 2010

Journal of African Earth Sciences

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“…6a), first from the Lützow -Holm Complex of eastern Dronning Maud Land (Shiraishi et al 1992(Shiraishi et al , 1994(Shiraishi et al , 2008, and then western and central Dronning Maud Land (Moyes & Groenewald 1996;Jacobs et al 1998). These results were used to argue for a continuous East African-Antarctic Orogen Jacobs et al 2003a, c;Jacobs & Thomas 2004) stretching 8000 km from the ArabianNubian Shield through eastern Africa and Dronning Maud Land to the Shackleton Range on the Coats Land coast of Antarctica (path EA1 in Fig.…”

Section: Antarctica Dividedmentioning

confidence: 99%

Antarctica and supercontinent evolution: historical perspectives, recent advances and unresolved issues

Harley

Fitzsimons

Zhao

2013

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The Antarctic rock record spans some 3.5 billion years of history, and has made important contributions to our understanding of how Earth's continents assemble and disperse through time. Correlations between Antarctica and other southern continents were critical to the concept of Gondwana, the Palaeozoic supercontinent used to support early arguments for continental drift, while evidence for Proterozoic connections between Antarctica and North America led to the 'SWEAT' configuration (linking SW USA to East Antarctica) for an early Neoproterozoic supercontinent known as Rodinia. Antarctica also contains relicts of an older Palaeo-to Mesoproterozoic supercontinent known as Nuna, along with several Archaean fragments that belonged to one or more 'supercratons' in Neoarchaean times. It thus seems likely that Antarctica contains remnants of most, if not all, of Earth's supercontinents, and Antarctic research continues to provide insights into their palaeogeography and geological evolution. One area of research is the latest Neoproterozoic-Mesozoic active margin of Gondwana, preserved in Antarctica as the Ross Orogen and a number of outboard terranes that now form West Antarctica. Major episodes of magmatism, deformation and metamorphism along this palaeo-Pacific margin at 590 -500 and 300-230 Ma can be linked to reduced convergence along the internal collisional orogens that formed Gondwana and Pangaea, respectively; indicating that accretionary systems are sensitive to changes in the global plate tectonic budget. Other research has focused on Grenville-age (c. 1.0 Ga) and PanAfrican (c. 0.5 Ga) metamorphism in the East Antarctic Craton. These global-scale events record the amalgamation of Rodinia and Gondwana, respectively. Three coastal segments of Grenville-age metamorphism in the Indian Ocean sector of Antarctica are each linked to the c. 1.0 Ga collision between older cratons but are separated by two regions of pervasive Pan-African metamorphism ascribed to Neoproterozoic ocean closure. The tectonic setting of these events is poorly constrained given the sparse exposure, deep erosion level and likelihood that younger metamorphic events have reactivated older structures. The projection of these orogens under the ice is also controversial, but it is likely that at least one of the Pan-African orogens links up with the Shackleton Range on the palaeo-Pacific margin of the craton. Sedimentary detritus and glacial erratics at the edge of the ice sheet provide evidence for the c.

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Isotopic constraints on Pan-African metamorphism in Dronning Maud Land, Antarctica

Cited by 28 publications

References 16 publications

New SHRIMP, Rb/Sr and Sm/Nd isotope and whole rock chemical data from central Mozambique and western Dronning Maud Land, Antarctica: Implications for the nature of the eastern margin of the Kalahari Craton and the amalgamation of Gondwana

New SHRIMP, Rb/Sr and Sm/Nd isotope and whole rock chemical data from central Mozambique and western Dronning Maud Land, Antarctica: Implications for the nature of the eastern margin of the Kalahari Craton and the amalgamation of Gondwana

Zircon and titanite age evidence for coeval granitization and migmatization of the early Middle and early Late Proterozoic Saharan Metacraton; example from the central North Sudan basement

Antarctica and supercontinent evolution: historical perspectives, recent advances and unresolved issues

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