1988
DOI: 10.1093/petrology/special_volume.1.89
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Evolution of Phanerozoic Eastern Australian Lithosphere: Isotopic Evidence for Magmatic and Tectonic Underplating

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Cited by 29 publications
(10 citation statements)
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“…A similar model is also considered likely for the origin of ultramafic lamprophyres in Greenland‐Labrador (Tappe et al, ). Calcic amphibole accompanied by minor phlogopite is a dominant phase in many metasomatic assemblages as observed in, for example, metasomatized ultramafic mantle xenoliths from continental mafic alkaline volcanism (e.g., O'Reilly, Griffin, & Stabel, ; Mayer et al, ). However, the potassic nature of lamprophyres in the present study (K 2 O/Na 2 O: 0.9–2.5) suggests that phlogopite in the mantle source is likely involved in magma generation (Figure b).…”
Section: Discussionmentioning
confidence: 99%
“…A similar model is also considered likely for the origin of ultramafic lamprophyres in Greenland‐Labrador (Tappe et al, ). Calcic amphibole accompanied by minor phlogopite is a dominant phase in many metasomatic assemblages as observed in, for example, metasomatized ultramafic mantle xenoliths from continental mafic alkaline volcanism (e.g., O'Reilly, Griffin, & Stabel, ; Mayer et al, ). However, the potassic nature of lamprophyres in the present study (K 2 O/Na 2 O: 0.9–2.5) suggests that phlogopite in the mantle source is likely involved in magma generation (Figure b).…”
Section: Discussionmentioning
confidence: 99%
“…These lavas have ocean island basalt source affinities contaminated by subcontinental lithospheric mantle [ O'Reilly and Zhang , ]. Mafic granulitic and rare eclogitic xenoliths suggest high geothermal gradients at the time of volcanism, and widespread intrusion of mafic material at the base of the crust (i.e., underplating) [ Lovering and White , ; O'Reilly and Griffin , ; Griffin et al , ; O'Reilly et al , ; Roach , ]. These high geothermal gradients are consistent with >90 mW m −2 heat flow measurements in areas of recent (<10 Ma) volcanism [ Purss and Cull , ].…”
Section: Geophysical and Geologic Constraintsmentioning
confidence: 99%
“…Deformation in the Sudbury region locally reached amphibolite facies just prior to the impact event, so a warm crust and upper mantle under the influence of an active continental margin would have received the bolide. Invasion of basalt into the lower crust, and mixing of crustal and mantle components there appears to be a common process of crustal rejuvenation during Proterozoic and Phanerozoic tectonic events (Griffin and O'Reilly, 1987;O'Reilly et al, 1988;Roberts and Ruiz, 1989;Kempton et al, 1990;Rudnick, 1992), so it is reasonable to suppose that the lower crust in the Sudbury region was a mobile mixture of younger basaltic and older crustal components at the time of the impact. Fracturing and load-release associated with the basin-forming impact would have provided a natural locus for emplacement of locally generated magmas.…”
Section: The Examples Listed Inmentioning
confidence: 99%