Age, Correlation, and Provenance of the Neoproterozoic Skelton Group, Antarctica: Grenville Age Detritus on the Margin of East Antarctica

Wysoczanski, Richard J.; Allibone, Andrew

doi:10.1086/421071

Cited by 48 publications

(34 citation statements)

References 61 publications

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“…,Mellish et al (2002),Myrow et al (2002),Read et al (2002),Vogel et al (2002);Goodge et al (2002),Curtis et al (2004),Goodge et al (2004a,b),Paulsen et al (2004),Stump et al (2004),Wysoczanski and Allibone (2004),Cottle and Cooper (2006a,b),Stump et al (2006Stump et al ( , 2007,Talarico et al (2007),Paulsen et al (2008),Cooper et al (2010),Goodge et al (2012), andPaulsen et al (2013).…”

mentioning

confidence: 99%

Detrital mineral ages from the Ross Supergroup, Antarctica: Implications for the Queen Maud terrane and outboard sediment provenance on the Gondwana margin

et al. 2015

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mentioning

confidence: 99%

Detrital mineral ages from the Ross Supergroup, Antarctica: Implications for the Queen Maud terrane and outboard sediment provenance on the Gondwana margin

et al. 2015

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“…In southern Victoria Land, zircon spectra from Skelton Group metasediments of the Dry Valleys area are exclusively Grenvillian in age (Wysoczanski and Allibone, 2004). Immediately to the south, all fi ve samples reported in this study have large and broad Proterozoic populations but with the dominant proportion of detritus derived from Grenville-aged rocks.…”

Section: Southern Victoria Landmentioning

confidence: 68%

“…A study by Wysoczanski and Allibone (2004) found no ~600-700 Ma zircons in metasediments of the Dry Valleys area, with the youngest zircons dated at 1050 Ma and 950 Ma for the northern and southern parts, respectively, of the Skelton Group. Again, whether this represents an absence of Neoproterozoic volcanism here, or that the specimens analyzed are from older, pre-volcanic, Skelton Group sediments is unknown.…”

Section: Southern Victoria Landmentioning

confidence: 99%

“…Wysoczanski and Allibone (2004) determined from detrital zircons that deposition occurred after ca. 950 Ma and 1050 Ma in the southern and northern parts of the Skelton Group, respectively.…”

Section: Regional Geology Of Southern Victoria Landmentioning

confidence: 99%

“…Here, the timing of sedimentation and rifting is even more poorly constrained than in the Australian segment of the orogen. Detrital zircon studies of the Beardmore and Skelton groups show major Grenvilleage populations (Goodge et al, , 2004Wysoczanski and Allibone, 2004), indicating sedimentation in the Neoproterozoic. Sedimentation predates intrusion of Ross-age plutons (maximum age 551 Ma, Rowell et al, 1993), but there is only one date (668 Ma) of synsedimentary volcanism from the entire length of the orogen .…”

Section: Introductionmentioning

confidence: 99%

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Dating of volcanism and sedimentation in the Skelton Group, Transantarctic Mountains: Implications for the Rodinia-Gondwana transition in southern Victoria Land, Antarctica

Cooper

Maas

Scott

et al. 2010

Geological Society of America Bulletin

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The Ross orogen in southern Victoria Land, Antarctica, is composed of Skelton Group metasedimentary rocks and varied plutons of the Granite Harbor intrusives.In the Baronick Glacier area, metasediments are dominated by thick sequences of coarse conglomerate, interbedded with pisolitic limestones. Clasts within metaconglomerates are predominantly volcanic, ranging in composition from basanite to rhyolite. Baronick basaltic clast compositions are mildly alkalic and ocean-island basalt-like, compatible with eruption in a continental-margin rift environment. Sr-Nd isotope ratios suggest rhyolites and quartztrachytes were produced by assimilation and fractional crystallization mechanisms. Two rhyolites yielded U-Pb zircon ages determined by laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) of 650.1 ± 4.0 Ma and 648.5 ± 3.2 Ma (both 2σ). Studies of southern Victoria Land Skelton Group metasediments indicate that, although dominated by Grenville-aged detrital zircons, they contain an important component dated between 630 and 680 Ma, overlapping the age of volcanism in both the Baronick Glacier and central Transantarctic Mountain areas. The distribution of 650 Ma, riftrelated volcanism in the southern VictoriaLand segment of the Ross orogen, and the absence of signifi cant older, but post-Grenville, extension-related zircon populations, is interpreted to refl ect initiation of Rodinia fragmentation on the Antarctic margin at this time. It is proposed that rifting along the paleo-Pacifi c margin was diachronous, with the Antarctic segment of the rift opening substantially earlier than in Australia. Based on the dates of subduction-related calc-alkaline plutons formed during the Ross and Delamerian orogenies, the paleo-Pacifi c Ocean in Antarctica may also have closed earlier than in Australia, effectively defi ning the time of Gondwana assembly.

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Identification of Hercynian shoshonitic intrusive rocks in central Hainan Island and its geotectonic implications

et al. 2006

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An identification has been made of some shoshonitic intrusive rocks in central Hainan Island recently. These rocks are K-rich (K 2 O=2.9%-5.1%, K 2 O/Na 2 O=0.95-2.12), distinctly enriched in LILE and LREE, strongly depleted in Nb, Ta, and moderately depleted in Sr and Ti, with ( 87 Sr/ 86 Sr)i = 0.70859-0.71425 and ε Nd (t) = (−2.77-−7.49). They were derived from an EMⅡ-type mantle source. The enrichment process is related to metasomatism of depleted mantle caused by a great amount of fluid-melt released from oceanic crust and terrigenous sediments at great depth (eclogite facies) during the subduction of the South China plate under the Indochina-South China Sea plate in the Carboniferous-Early Permian. A SHRIMP U-Pb zircon dating yields a crystallization age of 272±7 Ma for the shoshonitic intrusions, which is coeval with the strongly peraluminous granites found in central Hainan Island. These two kinds of rocks generally possess syn-intrusion ductile deformation structures. Thus they are considered to have been generated during the early stage (syn-thrust phase) of a post-collisional event. The primary magma of shoshonitic rocks was produced at a depth > 80 km by decompressiondehydration melting of previously enriched lithospheric mantle wedge, phlogopite-bearing garnet peridotite, which was in turn caused by the break-off of a descendent slab and upwelling of a hot asthenosphere. The rising of melts was accompanied by crustal contamination and crystallization fractionation (AFC). Combining with other related data, it is proposed that the southwards subduction and amalgamation of the South China plate with the IndoChina-South China Sea plate took place at ca. 287-278 Ma, which was a part of the convergence process of the Pangea supercontinent. The suture zone was probably located along the line of Song Ma-Beibu Gulf-north margin of the Yunkai Mountains-Wuyi Mountains.

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Age, Correlation, and Provenance of the Neoproterozoic Skelton Group, Antarctica: Grenville Age Detritus on the Margin of East Antarctica

Cited by 48 publications

References 61 publications

Detrital mineral ages from the Ross Supergroup, Antarctica: Implications for the Queen Maud terrane and outboard sediment provenance on the Gondwana margin

Detrital mineral ages from the Ross Supergroup, Antarctica: Implications for the Queen Maud terrane and outboard sediment provenance on the Gondwana margin

Dating of volcanism and sedimentation in the Skelton Group, Transantarctic Mountains: Implications for the Rodinia-Gondwana transition in southern Victoria Land, Antarctica

Identification of Hercynian shoshonitic intrusive rocks in central Hainan Island and its geotectonic implications

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