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  • 1995-1999  (1)
  • 1980-1984  (4)
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  • 1
    Series available for loan
    Series available for loan
    Geology of the Bunger Hills-Denman glacier region, East Antarctica (1995)
    Canberra : Australian Government Publishing Service
    Details Availability
    Call number: AWI G9-96-0440 ; AWI G9-96-0502
    Type of Medium: Series available for loan
    Pages: x, 124 p. , Ill., graph. Darst., Kt. , 1 Kt.-Beil.
    ISBN: 0-644-45247-1
    ISSN: 0084-7089
    Series Statement: Bulletin / Australian Geological Survey Organisation 244
    URL: https://d28rz98at9flks.cloudfront.net/7/Bull_244.pdf
    Note: Contents: Abstract. - Introduction. - Bunger Hills-Obruchev Hills area. - Metamorphic rocks. - Pyroxene-quartz-feldspar gneiss. - Mafic granulite. - Ultramafic rocks. - Garnet-quartz-feldspar gneiss. - Aluminous metasediments. - Quartzite. - Calc-silicate rocks and marble. - Igneous rocks. - Mafic to felsic plutonic rocks. - Felsic dykes and minor intrusions. - Mafic dykes. - Rapakivi granite and felsic volcanics. - Denman Glacier Area. - Metamorphic rocks. - Felsic orthogneiss. - Mafic rocks. - Ultramafic rocks. - Garnet-quartz-feldspar gneiss. - Metasediments. - Igneous rocks. - Mafic to felsic plutonic rocks. - Felsic dykes and minor intrusions. - Mafic dykes. - Mount Amundsen and Mount Sandow. - Sandow Group. - Sediments. - Metabasalt. - Structural Geology. - Bunger Hills area. - D1 deformation. - D2 deformation. - D3 deformation. - D4 deformation. - Denman Glacier area and Mounts Amundsen and Sandow. - Metamorphism. - Bunger Hills area. - Peak metamorphism. - Retrograde metamorphism. - Denman Glacier area. - Discussion. - Geological history of the Bunger Hills area. - Regional correlations. - Gondwana reconstruction and tectonic synthesis. - Gondwana correlations. - Acknowledgements. - References. - Appendix: Chemical analyses of rock samples rom the Bunger Hills and Denman Glacier areas. - Analytical methods. - Precision and accuracy.
    Location: AWI Reading room
    Location: AWI Reading room
    Branch Library: AWI Library
    Branch Library: AWI Library
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  • 2
    Electronic Resource
    Electronic Resource
    Geochemistry and geochronology of proterozoic tholeiite dykes of east antarctica: evidence for mantle metasomatism (1982)
    Springer
    Contributions to mineralogy and petrology 78 (1982), S. 305-317 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Two episodes of tholeiite dyke emplacement have been identified in Archaean high-grade metamorphics of the Napier Complex in Enderby Land. Middle Proterozoic Amundsen dykes are typical continental tholeiites and most of the chemical variation in individual suites can be explained in terms of different degrees of partial melting and low-pressure crystal fractionation. Group I Amundsen tholeiites were derived from a relatively homogeneous source region 1,190±200 m.y. ago, whereas that of the group II Amundsen tholeiites was chemically and isotopically heterogeneous. Group II dykes have various degrees of enrichment in incompatible elements, and commonly show normalised trace element abundance patterns with negative Nb anomalies. These features imply variable metasomatism of the source region by a volatile-rich fluid phase (rather than a melt of any observed igneous composition) enriched in K, Rb, Ba, Th, and possibly La and Ce. Early Proterozoic (2,350±48 m.y.) tholeiites were emplaced at considerable depths in the crust during the waning stages of granulite-facies metamorphism and include a high-Mg suite of possible komatiitic affinity, ranging in composition from hypersthene-rich tholeiite (norite) to quartz-rich tholeiite. They tend to have higher ratios of highly to moderately incompatible elements (e.g., K/Zr, K/Ce), and larger Nb anomalies (i.e., higher K/Nb) compared with middle Proterozoic tholeiites, suggesting derivation from more enriched source regions. Isotopic data are not compatible with significant crustal contamination, but constrain source metasomatism to a time immediately before emplacement. Metasomatism of the source region of the much younger group I tholeiites may have been contemporaneous with that of the high-Mg suite.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00398925
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  • 3
    Electronic Resource
    Electronic Resource
    Unsupported radiogenic Pb in zircon: a cause of anomalously high Pb-Pb, U-Pb and Th-Pb ages (1984)
    Springer
    Contributions to mineralogy and petrology 88 (1984), S. 322-327 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Ion microprobe U-Th-Pb isotopic analyses of zircons from a granodioritic orthogneiss from the Napier Complex, Mount Sones, Enderby Land, Antarctica, have identified an unambiguous example of unsupported radiogenic Pb in a 3,950 Ma-old crystal. At one 40 μm spot on the crystal an unusually large heterogeneity in Pb content was found, the concentration of radiogenic Pb ranging from 5 to 50 percent higher than could have been generated in 3,950 Ma by radioactive decay of the co-existing U and Th. This relative excess of radiogenic Pb is attributed to Pb gain rather than to U and Th loss because first, the Pb content varied by more than the U or Th contents and secondly, changes in the Pb/U, Pb/Th and Pb isotopic composition correlated directly with changes in the Pb concentration. The individual 207Pb/206Pb apparent ages ranged from 4,000 Ma to 4,145 Ma, all greater than the inferred age of the crystal. A correlation between 207Pb/206Pb and Pb/U shows that the Pb excess has not resulted from recent Pb movement. The spot apparently gained radiogenic Pb about 2,500 Ma ago, at the same time as the majority of the other zircons in the rock suffered substantial Pb loss. The Pb movement occurred in response to a discrete geologic event. Reverse discordance is a phenomenon that must be considered when interpreting zircon U-Pb ages, especially 207Pb/206Pb ages of single crystals or portions of crystals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00376756
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  • 4
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    Unsupported radiogenic Pb in zircon: a cause of anomalously high Pb-Pb, U-Pb and Th-Pb ages (1984)
    Springer
    Details
    Publication Date: 1984-01-01
    Print ISSN: 0010-7999
    Electronic ISSN: 1432-0967
    Topics: Geosciences
    Published by Springer
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  • 5
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    Geochemistry and geochronology of proterozoic tholeiite dykes of east antarctica: evidence for mantle metasomatism (1982)
    Springer
    Details
    Publication Date: 1982-01-01
    Print ISSN: 0010-7999
    Electronic ISSN: 1432-0967
    Topics: Geosciences
    Published by Springer
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