Isotopic evidence for rapid continental growth in an extensional accretionary orogen: The Tasmanides, eastern Australia

Kemp, Anthony I.S.; Hawkesworth, Chris J.; Collins, William J.; Gray, C. M.; Blevin, Phillip L.

doi:10.1016/j.epsl.2009.05.011

Cited by 439 publications

(254 citation statements)

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“…Zircon Hf isotopes can be used to track the history of the chemical differentiation of crust and mantle as well as the heterogeneity of the continental crust (Kinny et al, 1991;Yang et al, 2007;Kemp et al, 2009;Dhuime et al, 2012;Tang et al, 2016;Vervoort and Kemp, 2016). The new zircon Hf isotopic data for the early Paleozoic igneous rocks presented in this study can provide key insights into the crustal accretion and reworking processes recorded in the eastern SZB.…”

Section: Crustal Accretion and Reworking In The Szbmentioning

confidence: 99%

“…In addition, Phanerozoic crustal accretion is known to have largely occurred in the Paleozoic orogenic belts (Şengör et al, 1993;Şengör and Natal'in, 1996;Wu et al, 2000;Jahn et al, 2000aJahn et al, , 2000bJahn, 2004;Hong et al, 2004;Windley et al, 2007;Wang et al, 2009;Kröner et al, 2014), and lateral subduction played an important role in the generation of continental crustal material (Şengör et al, 1993;Kelemen, 1995;Şengör and Natal'in, 1996;Xiao et al, 2004;Kemp et al, 2009;Xiao and Santosh, 2014;Gazel et al, 2015;Kelemen and Behn, 2016). However, the Paleozoic orogenic belts in the eastern Central Asian Orogenic Belt are also associated with multiple microcontinents.…”

Section: Introductionmentioning

confidence: 99%

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Geochronology and geochemistry of early Paleozoic igneous rocks from the Zhangguangcai Range, northeastern China: Constraints on tectonic evolution of the eastern Central Asian Orogenic Belt

Wang

Pei

et al. 2017

Lithosphere

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This study presents new geochronological and geochemical data for early Paleozoic igneous rocks of the Zhangguangcai Range, northeastern China, and uses these data to further define the early Paleozoic tectonic evolution of the Songnen-Zhangguangcai Range block (SZB) and the Jiamusi block, and provide insights into crustal growth and reworking processes in these blocks of the eastern Central Asian Orogenic Belt. New zircon U-Pb data indicate widespread early Paleozoic magmatism (ca. 516, and 426 Ma) in the southeastern SZB. The ca. 516 Ma magmatism formed Na-rich tonalites that contain low concentrations of rare earth elements, are enriched in Eu and Sr, have high CaO/Al 2 O 3 and Ba/La ratios, low Rb/Sr and Rb/Ba ratios, and negative Ce anomalies and zircon ε Hf (t) values. These features suggest an origin from magmas generated by partial melting of ancient accumulated gabbroic rocks with the addition of subducted-sediment-derived fluids. The ca. 496-482 Ma magmatism formed calc-alkaline I-type biotite granodiorites and monzogranites, whereas the ca. 475-461 Ma igneous rocks include biotite monzogranites with K-rich adakitic signatures and alkali-feldspar granites. These ca. 496-461 Ma granitoids have zircon ε Hf (t) values from -0.82 to +5.44 and two-stage depleted-mantle model (T DM2 ) ages of 1490-1103 Ma, suggesting they formed from magmas generated by partial melting of heterogeneous Mesoproterozoic lower crustal material. The ca. 426 Ma Na-rich tonalites are geochemically similar to the ca. 516 Ma tonalites and also originated by partial melting of ancient gabbroic or amphibolitic rocks with the involvement of subducted-sediment-derived fluids. The geochemistry of these early Paleozoic igneous rock assemblages is indicative of formation in an active continental margin setting associated with northwestward subduction beneath the southeastern SZB. The zircon Hf isotopic compositions of these early Paleozoic igneous rocks indicate that Paleoproterozoic-Mesoproterozoic crustal material was reworked during the early Paleozoic subduction-and collision-related tectonism.

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Section: Crustal Accretion and Reworking In The Szbmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Geochronology and geochemistry of early Paleozoic igneous rocks from the Zhangguangcai Range, northeastern China: Constraints on tectonic evolution of the eastern Central Asian Orogenic Belt

Wang

Pei

et al. 2017

Lithosphere

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“…Recent studies of the Australian sector of this accretionary orogen using a combined Hf -O isotope analysis of zircon from arc rocks have shown that significant crustal growth through juvenile magma addition is most pronounced in periods of extension associated with subduction zone retreat, while contractional periods are dominated by reworking of older crust (Kemp et al 2009). Yakymchuk et al (2013) extend this approach to the Ross Province of Marie Byrd Land, and, in particular, to two generations of granite in the migmatitic Fosdick Complex.…”

Section: Pacific Margin Of Antarcticamentioning

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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“…Accretionary and collisional orogens are important sites for the partial melting of recycled sedimentary rocks to form S-type granites (e.g., Sylvester, 1998;Barbarin, 1999;Collins and Richards, 2008;Kemp et al, 2009). The time interval between the deposition of sedimentary rocks and formation of magmatic rocks can be less than 50 m.y.…”

Section: Introductionmentioning

confidence: 99%

Paleoproterozoic S-type granites in the Helanshan Complex, Khondalite Belt, North China Craton: Implications for rapid sediment recycling during slab break-off

Wei

Wang

et al. 2014

Precambrian Research

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a b s t r a c t S-type granites, typically derived from the rapid recycling of sedimentary rocks, are sometimes accompanied by contemporary mafic magmatism and granulite metamorphism. However, the geodynamic context for such rock suites is often highly disputed, with various model proposed, including back-arc basin opening, lithospheric delamination, mantle plume and continental rifting. The Paleoproterozoic Khondalite Belt in the North China Craton provides an example of synchronous mafic and felsic magmatism that was accompanied by granulite-facies metamorphic events for which the tectonic affinities of these rocks remains unclear. This study integrates in situ zircon Hf-O isotope analyses, whole-rock geochemistry and Nd isotope results for the earliest two-mica granites (ca. 1.95 Ga) in order to provide constraints on the above issues. The granites are strongly peraluminous (A/CNK value >1.1), and characterized by high zircon ␦18 O values of 7.3-10.6‰, corresponding to calculated magmatic ␦ 18 O values of 9.1-12.3‰, similar to those of typical S-type granites. They have relatively high and homogeneous ε Nd (t) values of −1.1 to +0.9 and highly variable zircon ε Hf (t) values ranging from −1.0 to +8.3. In situ zircon Hf-O isotopic compositions indicate that the S-type granites may contain some mantle or juvenile crustal components in addition to a sediment component. Based on the new results and published data, a slab break-off model is proposed to explain the rapid recycling of sedimentary precursors and the generation of the ca. 1.95 Ga S-type granites.

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Isotopic evidence for rapid continental growth in an extensional accretionary orogen: The Tasmanides, eastern Australia

Cited by 439 publications

References 80 publications

Geochronology and geochemistry of early Paleozoic igneous rocks from the Zhangguangcai Range, northeastern China: Constraints on tectonic evolution of the eastern Central Asian Orogenic Belt

Geochronology and geochemistry of early Paleozoic igneous rocks from the Zhangguangcai Range, northeastern China: Constraints on tectonic evolution of the eastern Central Asian Orogenic Belt

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

Paleoproterozoic S-type granites in the Helanshan Complex, Khondalite Belt, North China Craton: Implications for rapid sediment recycling during slab break-off

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