Late Pan-African granitoids from the Grove Mountains, East Antarctica: Age, origin and tectonic implications

Liu, Xiaochun; Jahn, Bor‐ming; Zhao, Yue; Li, Miao; Li, Huimin; Liu, Xiaohan

doi:10.1016/j.precamres.2005.11.017

Cited by 68 publications

(30 citation statements)

References 83 publications

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“…If this finding can be substantiated in the future, the ɛ Nd ‐La/Yb relationship may be helpful to distinguish terrigenous detritus of African and East Antarctic origin. Archean TTG are abundant rock types along the exposed coast of East Antarctica [ Liu et al , 2006; Stephenson , 2000; Zhao et al , 1997] whereas similar rocks are not exposed in the southern part of South Africa. Nevertheless, Archean detritus ultimately derived from the Kaapvaal and Zimbabwe cratons control the sedimentary load of the Agulhas Current as indicated by the suspended particles of this study and sediments of the Cape Basin [ Rutberg et al , 2005; Franzese et al , 2006].…”

Section: Discussionmentioning

confidence: 99%

Nd isotopic constraints on the origin of suspended particles in the Atlantic Sector of the Southern Ocean

Hegner¹,

Dauelsberg

Loeff

et al. 2007

Geochem Geophys Geosyst

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In the nutrient‐rich Southern Ocean, Fe is a vital constituent controlling the growth of phytoplankton. Despite much effort, the origin and transport of Fe to the oceans are not well understood. In this study we address the issue with geochemical data and Nd isotopic compositions of suspended particle samples collected from 1997 to 1999 in the South Atlantic Sector of the Southern Ocean. Al, Th, and rare earth element (REE) concentrations as well as 143Nd/144Nd isotopic ratios in acetic acid‐leached particle samples representing the lithogenic fraction delineate three major sources: (1) Patagonia and the Antarctic Peninsula provide material with ɛNd > −4 that is transported toward the east with the polar and subpolar front jets, (2) the south African shelf, although its influence is limited by the circumpolar circulation and wind direction, can account for material with ɛNd of −12 to −14 adjacent to South Africa, and (3) East Antarctica provides material with ɛNd of −10 to −15 to the eastern Weddell Sea and adjacent Antarctic Circumpolar Current. For this region we interpret the Nd isotopic evidence in combination with oceanographic/atmospheric constraints as evidence for supply of significant amounts of terrigenous detritus by icebergs.

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Section: Discussionmentioning

confidence: 99%

Nd isotopic constraints on the origin of suspended particles in the Atlantic Sector of the Southern Ocean

Hegner¹,

Dauelsberg

Loeff

et al. 2007

Geochem Geophys Geosyst

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“…These problems have been discussed previously by many workers (e.g., DePaolo, 1988;Nelson and DePaolo, 1985;Arndt and Goldstein, 1987;DePaolo et al, 1991; Chap. 4 in Dickin, 2005;Liu et al, 2006).…”

Section: Smend Geochronologymentioning

confidence: 99%

Precambrian history of the Zona Transversal of the Borborema Province, NE Brazil: Insights from Sm–Nd and U–Pb geochronology

Schmus

Kozuch

Neves

2011

Journal of South American Earth Sciences

203

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“…Outcrops further west in MacRobertson Land and the northern Prince Charles Mountains belong to the c. 1.0 Ga Rayner Complex with only localized evidence for the 0.5 Ga event Boger et al 2000Boger et al , 2002Carson et al 2000), and so appear to mark a western limit for Pan-African tectonism. However, Pan-African metamorphism and deformation was found to extend south of Prydz Bay along the eastern edge of the Amery Ice Shelf (Liu et al 2009b), and inland to the Grove Mountains (Mikhalsky et al 2001;Liu et al 2006Liu et al , 2007 and southern Prince Charles Mountains in the Lambert Graben (Boger et al 2001Corvino et al 2005Corvino et al , 2008.…”

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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Late Pan-African granitoids from the Grove Mountains, East Antarctica: Age, origin and tectonic implications

Cited by 68 publications

References 83 publications

Nd isotopic constraints on the origin of suspended particles in the Atlantic Sector of the Southern Ocean

Nd isotopic constraints on the origin of suspended particles in the Atlantic Sector of the Southern Ocean

Precambrian history of the Zona Transversal of the Borborema Province, NE Brazil: Insights from Sm–Nd and U–Pb geochronology

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

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