https://ogma.newcastle.edu.au/vital/access/ /manager/Index ${session.getAttribute("locale")} 5 https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:25857 Wed 25 Jan 2017 11:31:39 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:4819 Wed 11 Apr 2018 16:53:24 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:6932 Wed 11 Apr 2018 16:43:57 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:6920 Wed 11 Apr 2018 16:18:58 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:6986 Wed 11 Apr 2018 15:22:17 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:55525 Wed 05 Jun 2024 09:16:28 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:49055 Wed 03 May 2023 15:47:17 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:6989 Sat 24 Mar 2018 08:37:50 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:10082 Sat 24 Mar 2018 08:12:39 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:18101 Sat 24 Mar 2018 08:04:36 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:18102 Sat 24 Mar 2018 08:04:30 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:18286 Sat 24 Mar 2018 08:04:21 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:21474 Sat 24 Mar 2018 08:03:42 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:17719 Sat 24 Mar 2018 07:57:25 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:20634 Sat 24 Mar 2018 07:55:46 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:5002 Sat 24 Mar 2018 07:44:13 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:26266 40Ar/³⁹Ar phengite dating to define pressure-temperature-time (P-T-t) histories for the rocks. The P-T-t histories are compared with competing geodynamic models for the Tasmanides, which can be summarized as (i) a retreating orogen model, the Tasmanides formed above a continuous, west dipping, and eastward retreating subduction zone, and (ii) a punctuated orogen model, the Tasmanides formed by several arc accretion, subduction flip, and/or transference events. Whereas both scenarios are potentially supported by the new data, an overlap between the timing of metamorphic recrystallization and key stages of Tasmanides evolution favors a relationship between a single, long-lived subduction zone and the formation, exhumation, and exposure of the high-pressure rocks. By comparison with the retreating orogen model, the following links with the P-T-t histories emerge: (i) exhumation and underplating of oceanic eclogite during the Delamerian Orogeny, (ii) recrystallization of underplated and exhuming high-pressure rocks at amphibolite facies conditions coeval with a period of rollback, and (iii) selective recrystallization of high-pressure rocks at blueschist facies conditions, reflecting metamorphism in a cooled subduction zone. The retreating orogen model can also account for the anomalous location of the Cambrian-Ordovician high-pressure rocks in the Devonian-Carboniferous New England Orogen, where sequential rollback cycles detached and translated parts of the leading edge of the overriding plate to the next, younger orogenic cycle.]]> Sat 24 Mar 2018 07:40:13 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:27213 Sat 24 Mar 2018 07:32:26 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:26681 Sat 24 Mar 2018 07:26:16 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:28768 Sat 24 Mar 2018 07:24:50 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:3480 Sat 24 Mar 2018 07:20:28 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:3156 Sat 24 Mar 2018 07:18:19 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:3154 Sat 24 Mar 2018 07:18:17 AEDT ]]> https://ogma.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://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:3169 Sat 24 Mar 2018 07:18:12 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:3170 Sat 24 Mar 2018 07:18:11 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:3167 2 μm), 237–245 Ma for the <2 μm fraction, 218 Ma for the <0.4 μm fraction and 196 Ma for the <0.1 μm fraction have been obtained from siltstones within and outside the damage zone. We believe the younger ages of 196–237 Ma indicate the time at which diagenetic illite–smectite formed and the 122–150 Ma dates from the <2 μm fraction represent the maximum age of gouge formation. The younger ages are thought to reflect the last slip event occurring on the faults, which is related to the rifting and dispersal of the eastern margin of the Australian continent.]]> Sat 24 Mar 2018 07:18:10 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:3168 Sat 24 Mar 2018 07:18:10 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:24545 Sat 24 Mar 2018 07:11:33 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:33623 Mon 26 Nov 2018 12:46:29 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:36781 Fri 03 Jul 2020 17:22:41 AEST ]]>