https://nova.newcastle.edu.au/vital/access/ /manager/Index en-au 5 https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:50843 1200°C. Silicon and Al contents and Mg# of serpentinized spinel harzburgite, as well as heavy rare earth element modeling results, suggest a high-degree of melt extraction of 20–30% in the garnet stability field and in an anhydrous environment, probably in ocean island or oceanic plateau environments. The samples in this study have HSE concentrations interpreted to have resulted from post-melting processes rather than a melt extraction feature, indicating that their Re–Os model ages need to be interpreted with caution. Nevertheless, the melt depletion ages obtained from the Woodsreef and Port Macquaries samples range between 1.4 and 1.1 Ga, consistent with previous studies on other Pacific-rim ophiolitic rocks. We argue that these ages might be related to a major depletion event during the transition between supercontinents Nuna and Rodinia. Such depletion events affected a large proportion of this section of the mantle before the incorporation of the peridotites into the oceanic lithosphere in the Paleo-Pacific associated with rapid ascent of mantle plumes. This interpretation is consistent with the occurrence of accreted volcanic islands in the Weraerai ophiolite mélange, as shown by the OIB chemical signatures of some of the mafic rocks, and their association with shallow water limestones that formed in near-equatorial latitudes. The proposed c. 530–510 Ma Paleo-Pacific Ocean mantle plume event coincides with a global peak of oceanic mantle plume events that may record the legacy of a circum-Rodinia subduction girdle driving antipodal mantle superplume episodes.]]> Wed 09 Aug 2023 09:17:40 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:49028 Wed 03 May 2023 12:45:01 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:41948 Tue 16 Aug 2022 14:31:41 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:33624 Thu 27 May 2021 14:35:03 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:7005 Sat 24 Mar 2018 08:37:50 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:3200 Sat 24 Mar 2018 07:21:54 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:54946 Fri 22 Mar 2024 15:22:30 AEDT ]]>