https://scholars.lib.ntu.edu.tw/handle/123456789/36406
標題: | Geochemistry of the 755 Ma Mundine Well dyke swarm, northwestern Australia: Part of a Neoproterozoic mantle superplume beneath Rodinia? | 作者: | Li, Xian-Hua Li, Zheng-Xiang Wingate, T.D. Chung, Sun-Lin Liu, Ying Lin, Guang-Chun Li, Wu-Xian |
關鍵字: | Neoproterozoic;Dolerite dykes;Northwestern Australia;Mantle superplume;Rodinia | 公開日期: | 2006 | 卷: | 146 | 期: | 1-2 | 起(迄)頁: | 1-15 | 來源出版物: | Precambrian Research | 摘要: | Geochemical & Nd¡VHf isotopic data are reported for dolerite samples from the Neoproterozoic (755 Ma) Mundine Well dyke swarm in northwestern Australia. These dolerites are tholeiitic in composition, crystallised from a common parental magma. Although the dolerite magma underwent varying degrees of crustal contamination during ascent & emplacement, the uncontaminated parental melt possessed geochemical & Nd isotopic characteristics, such as Nb/La?1.5, Nb/Th?15, Nb/U?50, Nd(T)?5, & Hf(T)?9 (estimated by extrapolation from geochemical correlations), that closely resemble plume-derived ocean island basalts. These features are also similar to those of dolerite dykes of similar age from Seychelles & South China.We propose that these late Neoproterozoic mafic suites may have been generated by melting of a vast asthenospheric mantle superplume that developed beneath, & led to breakup of, the Rodinia supercontinent. |
URI: | http://www.scopus.com/inward/record.url?eid=2-s2.0-33645164593&partnerID=MN8TOARS http://scholars.lib.ntu.edu.tw/handle/123456789/324821 http://ntur.lib.ntu.edu.tw/bitstream/246246/2006111501254700/1/1247.pdf |
其他識別: | 246246/2006111501254700 | DOI: | 10.1016/j.precamres.2005.12.007 |
顯示於: | 地質科學系 |
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