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  • 1
    Online Resource
    Online Resource
    East Perth, Western Australia : Geological Survey of Western Australia
    UID:
    b3kat_BV049091118
    Format: 1 Online-Ressource (82 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 9781741689822 , 1741689821
    Content: Mesozoic transformation of Western Australia spans 252 to 66 Ma, an era represented by sedimentary deposits that cover about 23% of the onshore part of the State and virtually all offshore basins, with the Upper Jurassic – Cretaceous extending beyond the continent onto oceanic crust. These sedimentary successions are up to 15 km thick in offshore depocentres and the Perth Basin, and contain only minor igneous rocks apart from areas near the continent–ocean boundary where intrusions are abundant.
    Note: 'Mesozoic transformation of Western Australia: rifting and breakup of Gondwana' is the latest release under the WA unearthed series aimed at geologists, and particularly newcomers to the State, to enable them to get a quick understanding of the geology and economic potential of various terrains. In this volume, much of the narrative concerns the offshore North West Shelf, Australia’s premier hydrocarbon province. Because of subdued tectonic events, the most significant resources in, or uses of, onshore Mesozoic strata are heavy mineral sand deposits on the Dampier Peninsula, water resources and gas storage. A series of paleogeographic reconstructions paired with isopach images illustrates the Mesozoic depositional and structural history of the State and its surrounding waters – each represent ‘time slices’ derived from regional correlations largely based on biostratigraphic studies. The four main phases of basin evolution are: Triassic intracratonic rifting; Early–Middle Jurassic rifting; Late Jurassic – Early Cretaceous breakup and separation; and lastly, trailing-edge rifting and marginal sag. However, these phases are not synchronous, as there are differences between some areas in their timing, especially with the progressive breaking away of continental fragments from north to south. Whereas the main text is largely concerned with geological evolution, there is also a series of boxes detailing other aspects such as mineralization, other resources, fossils, impact features and provenance.
    Language: English
    Keywords: Western Australia ; Regionale Geologie ; Gondwana ; Mesozoikum
    URL: Volltext  (kostenfrei)
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  • 2
    UID:
    b3kat_BV048541363
    Format: 1 Online-Ressource (XX, 356 Seiten) , 30 cm
    Edition: Second edition
    ISBN: 1741686903 , 9781741686906
    Series Statement: Mineral resource bulletin
    Content: The second edition of Gemstones of Western Australia is an updated version published in response to public demand following depletion of copies of the 2013 edition. These editions form the first systematic works on the subject of gemstones found in the State since the formal inception of the Geological Survey of Western Australia (GSWA) in 1896. In this second joint publication by GSWA and the Gemmological Association of Australia (GAA), the authors have once again assembled a comprehensive resource on almost all gemstones and decorative stones used in jewellery and ornamental sculpture known in the State. The second edition has been updated and expanded to include additional occurrences of emerald, opal, agate, chalcedony, organic gems, tiger eye jasper, aragonite, cordierite, black jade, mookaite, fuchsite, jasper, and Munjina and Print stones, together with numerous, new gemstone images. Geographical locations are indicated where possible, and abundant references to earlier work given. While systematically sound and scientifically authoritative, the second edition of Gemstones of Western Australia is written not only for the professional geologist and gemmologist, but also with the experienced fossicker and amateur rockhound in mind.
    Note: Earlier edition: 2013
    Additional Edition: Erscheint auch als Druck-Ausgabe
    Language: English
    Keywords: Western Australia ; Mineral
    URL: Volltext  (kostenfrei)
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