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    Wierzbowski, H. Anczkiewicz, R. Bazarnik, J. and Pawlak, J. 2012. Strontium isotope variations in Middle Jurassic (Late Bajocian–Callovian) seawater: Implications for Earth's tectonic activity and marine environments. Chemical Geology, Vol. 334, p. 171.


    Elliot, D.H. and Fleming, T.H. 2008. Physical volcanology and geological relationships of the Jurassic Ferrar Large Igneous Province, Antarctica. Journal of Volcanology and Geothermal Research, Vol. 172, Issue. 1-2, p. 20.


    Martin, A.K. 2007. Gondwana breakup via double-saloon-door rifting and seafloor spreading in a backarc basin during subduction rollback. Tectonophysics, Vol. 445, Issue. 3-4, p. 245.


    Willan, Robert C.R. and Hunter, Morag A. 2005. Basin evolution during the transition from continental rifting to subduction: Evidence from the lithofacies and modal petrology of the Jurassic Latady Group, Antarctic Peninsula. Journal of South American Earth Sciences, Vol. 20, Issue. 3, p. 171.


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Middle Jurassic air fall tuff in the sedimentary Latady Formation, eastern Ellsworth Land

  • MORAG A. HUNTER (a1), TEAL R. RILEY (a1) and IAN L. MILLAR (a1) (a2)
  • DOI: http://dx.doi.org/10.1017/S0954102004001944
  • Published online: 01 June 2004
Abstract

Rhyolitic volcanism along the proto-Pacific margin of Gondwana occurred at intervals throughout the Jurassic. Silicic melt generation has been interpreted as a result of interaction between mantle plumes and subduction modified lower crust. The rhyolitic Mount Poster Formation of the southern Antarctic Peninsula is c. 184 Ma in age (V1), whereas silicic volcanism of the northern Antarctic Peninsula is c. 168 Ma (V2). A thin, (13.5 cm) reworked air fall tuff, interbedded with sandstone and mudstone of the Latady Formation in the southern Antarctic Peninsula has a REE pattern similar to V2 volcanic material but is isotopically similar to the extracaldera, low-Ti rhyolites of the V1 Mount Poster Formation. The tuff is interbedded with lithofacies that have been assigned a Callovian age (164–159 Ma) in the west of the area. Simple mixing between a MASH source and reworked Early Jurassic (184 Ma) V1 volcanic material during V2 volcanism in the area explains the apparent discrepancy between the faunal age and the isotopic characteristics of the ash fall. This supports a Middle Jurassic (168 Ma) age that also corresponds to a 167 ± 3 Ma age from Mt Rex on the periphery of the Mount Poster Formation, which was previously thought to be anomalous.

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Antarctic Science
  • ISSN: 0954-1020
  • EISSN: 1365-2079
  • URL: /core/journals/antarctic-science
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