New constraints from U–Pb, Lu–Hf and Sm–Nd isotopic data on the timing of sedimentation and felsic magmatism in the Larsemann Hills, Prydz Bay, East Antarctica

Grew, Edward S.; Carson, Chris; Christy, Andrew G.; Maas, Roland; Yaxley, Gregory M.; Boger, Steven D.; Fanning, Christopher

doi:10.1016/j.precamres.2012.02.016

Cited by 69 publications

(66 citation statements)

References 77 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, in contrast to Kelsey et al (2008) the range in Neoproterozoic ages from 1000 to 710 or even 580 Ma is considered to reflect the variable effect of the Prydz Tectonic Event at 530 Ma on metamorphic zircon formed during the Rauer Tectonic Event by 970 Ma, rather than defining a younger maximum age of deposition for the Mather Paragneiss. Similar zircon age spectrum was reported also from the nearby Larsemann Hills in the Prydz Belt (Grew et al, 2012), and they also concluded that the wide apparent age range (from 905 to 510 Ma) is explained as variable resetting of earlier metamorphic zircon during the later stage metamorphism. Although there is no clear evidence of the mutual relationships between the Mather Paragneiss and the surrounding Archaean tonalitic gneiss, the modes of occurrence of the Mather Paragneiss layers localized in the Archaean tonalitic gneiss unit indicate that the UHT metamorphism was restricted to a specific slice containing the Mather Paragneiss assemblage, which was interleaved with the other units in the Rauer Islands only later, in a separate episode related to the Prydz event at 545-510 Ma.…”

Section: Relationships Between Archaean and Proterozoic Crustal Domaisupporting

confidence: 79%

“…It preserves a complex record of latest Mesoproterozoic to early Neoproterozoic magmatism, sedimentation and granulite facies tectonism (Wang et al, 2008;Liu et al, 2009;Grew et al, 2012) (Table 1) that is broadly comparable to tectonothermal events in the Rayner Complex to the west (Liu et al, 2013). This event sequence is strongly but variably overprinted by a second granulite facies metamorphism in the early to middle Cambrian (545-515 Ma: Hensen and Zhou, 1995;Zhao et al, 1995;Carson et al 1996;Fitzsimons, 1996;Fitzsimons et al, 1997).…”

Section: Introductionmentioning

confidence: 92%

“…This event sequence is strongly but variably overprinted by a second granulite facies metamorphism in the early to middle Cambrian (545-515 Ma: Hensen and Zhou, 1995;Zhao et al, 1995;Carson et al 1996;Fitzsimons, 1996;Fitzsimons et al, 1997). Recent structurally-controlled geochronology of the inferred cover sequence, the Brattstrand Paragneiss (Fitzsimons, 1997), in the Larsemann Hills area of SE Prydz Bay (Wang et al, 2008;Grew et al, 2012;Liu et al, 2013) demonstrate a maximum deposition age close to 1000 Ma, and minimum deposition age older than the 960-990 Ma ages of metamorphosed felsic intrusive rocks (the Blundell Orthogneiss of Grew et al, 2012). The basement gneisses (Søstrene Orthogneiss: Fitzsimons, 1997), cover metasediments (Brattstrand Paragneiss) and early intrusive charnockites and enderbites (Blundell Orthogneiss) of the Prydz Belt all experienced a common high-grade metamorphic event broadly constrained from complex zircon age populations to have progressed between 930 and 890 Ma, consistent with 900 Ma ages obtained from pegmatites (Kelsey et al, 2008).…”

Section: Introductionmentioning

confidence: 97%

“…The Prydz Belt of SE Prydz Bay is polymetamorphic (Wang et al, 2008;Liu et al, 2009;Grew et al, 2012Grew et al, , 2013Harley et al, 2013;Liu et al, 2013). It preserves a complex record of latest Mesoproterozoic to early Neoproterozoic magmatism, sedimentation and granulite facies tectonism (Wang et al, 2008;Liu et al, 2009;Grew et al, 2012) (Table 1) that is broadly comparable to tectonothermal events in the Rayner Complex to the west (Liu et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Peak and post–peak development of UHT metamorphism at Mather Peninsula, Rauer Islands: Zircon and monazite U–Th–Pb and REE chemistry constraints

Hokada

Harley

Dunkley

et al. 2016

Journal of Mineralogical and Petrological Sciences

View full text Add to dashboard Cite

Zircon and monazite in ultrahigh temperature (UHT) metamorphic rocks from the Rauer Islands of Prydz Bay in East Antarctica were investigated in terms of U-Th-Pb and rare earth elements (REE) chemistry along with textural context. All five analyzed samples, three from the Mather Paragneiss UHT unit and two from the host orthogneiss unit yield 522-517 Ma concordant zircon ages, with older protolith/inherited zircon ages of 3268 and 2800-2400 Ma along with highly discordant Mesoproterozoic to Neoproterozoic ages. Our data confirm the Archaean protolith age for the host orthogneiss surrounding the UHT Mather Paragneiss. The Archaean and Mesoproterzoic components of the Rauer Islands were not amalgamated in the Rauer Tectonic Event at 1030-990 Ma, and deposition of the Mather Paragneiss was considered at some time after the Rauer Tectonic Event. In contrast to the well-defined 520 Ma ages obtained from the zircons in the UHT rocks, monazite grains measured by electron microprobe show a distinct internal zonation, from 580-560 Ma dark-backscattered electron image (BSE) cores enriched in middle rare earth elements (MREE) and heavy rare earth elements (HREE) to 550-520 Ma mid-BSE mantles and 510-500 Ma bright-BSE rims. From the chemical and textural evidence we infer that the MREE-HREE-rich 580-560 Ma monazite cores may have formed through the decomposition of garnet during decompression just after the UHT event, whereas the MREE-HREE-depleted 550-500 Ma monazite grains/rims formed or recrystallized in reactions associated with subsequent extensive hydration during the upper-amphibolite to granulite-facies main Prydz Tectonic Event, which also caused marked recrystallization of zircon. The above data strongly support the interpretation that the UHT metamorphism occurred prior to 590-580 Ma.

show abstract

Section: Relationships Between Archaean and Proterozoic Crustal Domaisupporting

confidence: 79%

Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Peak and post–peak development of UHT metamorphism at Mather Peninsula, Rauer Islands: Zircon and monazite U–Th–Pb and REE chemistry constraints

Hokada

Harley

Dunkley

et al. 2016

Journal of Mineralogical and Petrological Sciences

View full text Add to dashboard Cite

show abstract

“…6b) (Wang et al 2008;Grew et al 2012), and so provide no evidence of a suture, but relationships are more complex in northern Prydz Bay and the southern Prince Charles Mountains. The Rauer Group of northern Prydz Bay comprises Archaean orthogneiss, with emplacement ages of c. 3.3 and 2.8 Ga, interleaved with c. 1.0 Ga units.…”

Section: Antarctica Dividedmentioning

confidence: 99%

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

Harley

Fitzsimons

Zhao

2013

View full text Add to dashboard Cite

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.

show abstract

Evincing the presence of a trans‐Gondwanian mobile belt in the interior of the Princess Elizabeth Land, East Antarctica: insights from offshore detrital sediments, rock fragments, and monazite geochronology

et al. 2022

View full text Add to dashboard Cite

East Gondwana was assembled through the stitching of the Indo‐Antarctica and Australo‐Antarctica domains which also represents the key Gondwana‐forming regions in present‐day East Antarctica. However, the Indo‐Antarctica and Australo‐Antarctica boundaries remain speculative and contentious, as the thick Antarctic Ice sheet precludes direct geological characterization of these terranes. In addition, the exact role of the Gamburtsev Subglacial Mountains, present in the interior of Princess Elizabeth Land (PEL), during the amalgamation of Gondwana, has not been well understood. We present new mineralogical data of offshore sediments from Prydz Bay to infer the geology of the interior of the PEL terrain, East Antarctica. Coast marginal outcrops dominantly expose igneous and granulite facies metamorphic rocks. Heavy minerals characterization of the rock fragments followed by consideration of the outcrop geology indicate a possible contribution of sediments from the far interior of PEL terrain. Total U–Pb chemical geochronology of detrital monazites dominantly shows a bimodal age distribution ascribable to Stenian to Tonian (~1,100 Ma, 900 Ma) event ages and a younger Pan‐African event (~500 Ma). Besides these, Tonian‐Cryogenian (~700 Ma) ages from texturally constrained monazites of a low‐grade schist rock fragment is reported for the first time from this sector. Consideration of glacial flow directions and the nature of rock fragments indicate their sourcing from the distal hinterland. The possible provenance is inferred to be from the Gamburtsev Subglacial Mountains.

show abstract

New constraints from U–Pb, Lu–Hf and Sm–Nd isotopic data on the timing of sedimentation and felsic magmatism in the Larsemann Hills, Prydz Bay, East Antarctica

Cited by 69 publications

References 77 publications

Peak and post–peak development of UHT metamorphism at Mather Peninsula, Rauer Islands: Zircon and monazite U–Th–Pb and REE chemistry constraints

Peak and post–peak development of UHT metamorphism at Mather Peninsula, Rauer Islands: Zircon and monazite U–Th–Pb and REE chemistry constraints

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

Evincing the presence of a trans‐Gondwanian mobile belt in the interior of the Princess Elizabeth Land, East Antarctica: insights from offshore detrital sediments, rock fragments, and monazite geochronology

Contact Info

Product

Resources

About