https://nova.newcastle.edu.au/vital/access/ /manager/Index en-au 5 https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:25857 Wed 25 Jan 2017 11:31:39 AEDT ]]> 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:18101 Sat 24 Mar 2018 08:04:36 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:18102 Sat 24 Mar 2018 08:04:30 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:17135 Sat 24 Mar 2018 08:02:29 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:3165 10 and Y, La and Nb values typical of tholeiitic magmas erupted in an island arc setting. By contrast, blueschists from this locality and from the Glenrock Station area show depleted REE patterns, Ti/V = 20–50, and eNd₄₈₀Ma = +8, features characteristic of normal mid-ocean ridge basalts (N-MORB). Meta-diorites from the Glenrock Station area have moderately depleted signatures (eNd₄₀₀Ma = +4.5) and Ti/V ratios and REE patterns typical of calc-alkaline and tholeiitic island arc magmas. These contrast with hornblende cumulate rocks from this location, which have very high Cr and Ni, low Zr and Y, and show slight LREE-enriched chondrite normalized patterns. Chromites (100 Cr/Cr+Al = 85) and clinopyroxenes (Wo₉₃En₄₂.₃Fs₇.₇ – Wo₄₈En₄₃.₇Fs₈.₃) in these rocks reveal an island arc affinity. The eNd₄₂₀Ma values vary from +2 to +4 and Rb–Sr ages from 425±177;44 Ma to 411±177;15 Ma. The core of a single grain of cumulus hornblende gave a poorly defined 40Ar/39Ar age of 394 Ma in contrast to younger ages (235–263 Ma) obtained from other grains. The younger ages are attributed to resetting of the K-Ar system during a metamorphic event. This study has provided further evidence for an Early Paleozoic arc-trench system along the eastern Gondwana margin.]]> Sat 24 Mar 2018 07:18:13 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:52953 Fri 03 Nov 2023 11:05:27 AEDT ]]>