Grenville-age magmatism at the south Tasman Rise (Australia): a new piercing point for the reconstruction of Rodinia. (Articolo in rivista)

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  • Grenville-age magmatism at the south Tasman Rise (Australia): a new piercing point for the reconstruction of Rodinia. (Articolo in rivista) (literal)
Anno
  • 2005-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1130/G21671.1 (literal)
Alternative label
  • Fioretti AM; Black, LP ; Foden J; Visona D (2005)
    Grenville-age magmatism at the south Tasman Rise (Australia): a new piercing point for the reconstruction of Rodinia.
    in Geology (Boulder Colo.)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Fioretti AM; Black, LP ; Foden J; Visona D (literal)
Pagina inizio
  • 769 (literal)
Pagina fine
  • 772 (literal)
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  • 33 (literal)
Rivista
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  • n.10 (literal)
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  • 4 (literal)
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  • 10 (literal)
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  • S (literal)
  • ISI Web of Science (WOS) (literal)
  • Google Scholar (literal)
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  • a Consiglio Nazionale delle Ricerche (CNR), Istituto di Geoscienze e Georisorse, Corso Garibaldi 37, I-35137 Padova, Italy b Research School of Earth Sciences, Australian National University, Canberra, ACT 0200, Australia c Minerals Division, Geoscience Australia, GPO Box 378, Canberra, ACT 2601, Australia d Department of Geology and Geophysics, University of Adelaide, Adelaide, SA 5005, Australia e Dipartimento di Mineralogia e Petrologia, Università di Padova, Corso Garibaldi 37, I-35137 Padova, Italy (literal)
Titolo
  • Grenville-age magmatism at the south Tasman Rise (Australia): a new piercing point for the reconstruction of Rodinia. (literal)
Abstract
  • A U-Pb zircon sensitive high-resolution ion microprobe age of 1119.4 ± 8.5 Ma, obained from a quartz syenite dredged from the South Tasman Rise (Australia), provides the first direct evidence of the presence of Grenville-age magmatic rocks along the central part of the hypothesized Australia-East Antarctica conjugate margin of Laurentia. The distinctive mineralogy and geochemistry of the rock and its Sm-Nd and Pb isotopic signatures 1) indicate that it represents a juvenile Grenville-age addition to the crust, 2) support a correlation with the Grenville magmatic province of the western United States, and 3) set a unique pivotal point for a precise reconstruction of Rodinia. The resulting scenario implies the presence of a new magmatic province crossing the East Antarctic craton, the extension of Proterozoic belts of southwest Laurentia to East Antarctica, and appears consistent with the Australia-western United States (AUSWUS) model. This tectonic setting envisages a near-local source for the ubiquitous Grenville-age detrital zircon population in marginal Neoproterozoic to early Paleozoic Gondwanan sequences and suggests a possible direct source for the widespread Grenville-age inherited zircon component observed in most Paleozoic granites in northern Victoria Land (Antarctica) and east Tasmania (Australia). (literal)
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