Geochemistry of the Mt Wright Volcanics from the Wonominta Block, northwestern New South Wales
| Autor: | D. J. Whitford, B. Zhou |
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| Rok vydání: | 1994 |
| Předmět: | |
| Zdroj: | Australian Journal of Earth Sciences. 41:331-340 |
| ISSN: | 1440-0952 0812-0099 |
| DOI: | 10.1080/08120099408728142 |
| Popis: | The Mt Wright Volcanics are located in the Wonominta Block of northwestern New South Wales. Detailed regional mapping has shown that the block is a composite tectonic unit and that the metavolcanic rocks described as the Mt Wright Volcanics may have been emplaced at different time from Late Proterozoic (northern section: Packsaddle, Nundora) to Early Cambrian (southern section: Mt Wright). Geochemical investigations, including major and trace elements, as well as analyses of relic clinopyroxene, show that the rocks have affinities with alkali basalt with light‐rare‐earth‐element‐enriched compositions. An intra‐plate extensional environment (such as rift‐ and/or plume‐related) is considered most likely for the formation of the rocks. Though metamorphosed to various degrees, the rocks apparently retain much of their primary Sr isotopic character (initial 87Sr/86Sr about 0.7032) and, apart from their age, resemble the Tertiary intraplate volcanism in eastern Australia. The Nd isotope analyses yield remarkabl... |
| Databáze: | OpenAIRE |
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