Vickie Bennett

Lachlan Orogen, Eastern Australia: Triangle Formation Records the Late Ordovician Arrival of the Macquarie Arc Terrane at the Margin of Eastern Gondwana

Publisher: American Geophysical Union (AGU)

Date: 09-2019

DOI: 10.1029/2019TC005480

Cross‐Orogen Granite Migration as an Indicator of Slab Rollback Along Eastern Gondwana

Publisher: American Geophysical Union (AGU)

Date: 06-2023

DOI: 10.1029/2023GC010895

Abstract: Slab rollback during subduction plays a key role in controlling continental growth at convergent plate boundaries. The dynamics of currently subducting slabs can be precisely constrained using geophysical techniques. In contrast, ancient episodes of slab rollback can be difficult to constrain, yet are critical to unlocking the tectonic evolution of long‐lived orogens such as the Phanerozoic Australian Tasmanides of eastern Gondwana. Recognition of ancient slab rollback relies on the identification of the progressive migration of magmatic arcs. Here, we investigate the timing and isotopic variation of ∼90 km of the trans‐orogen migration of the Carboniferous Bathurst Batholith as a potential indicator of slab rollback. U–Pb–Hf isotopes, combined with a regional zircon Hf isotope data set, suggest that the eastward migration of the batholith over ∼18 Myr, from 340.1 to 322.4 Ma, records a maximum slab steepening rate of ∼0.6–1.2° Myr −1 in a relatively stable trench setting. These results provide a magmatic record of Carboniferous slab rollback and establish a missing link between the long‐lived Lachlan and New England orogens of the eastern Gondwanan Tasmanides.

Primordial and recycled helium isotope signatures in the mantle transition zone

Publisher: American Association for the Advancement of Science (AAAS)

Date: 16-08-2019

DOI: 10.1126/SCIENCE.AAX5293

Abstract: Helium isotopes provide a window into the very deepest and oldest parts of Earth's voluminous mantle. However, several processes tend to obscure the helium isotope signal from reservoirs in basaltic lavas that have erupted at the surface. Timmerman et al. identified a set of diamonds that formed deep within Earth and were rapidly erupted, which have avoided near-surface contamination. They find evidence for a deep, primordial rock source along with mixing of sediments from old subducting plates. The signatures extracted from these diamonds have implications for chemical and dynamic models of Earth. Science , this issue p. 692

U‐Pb‐Hf‐REE‐Ti zircon and REE garnet geochemistry of the Cambrian Attunga eclogite, New England Orogen, Australia: Implications for continental growth along eastern Gondwana

Publisher: American Geophysical Union (AGU)

Date: 08-2017

DOI: 10.1002/2016TC004408

Comment on “Tectonics of the Isua Supracrustal Belt 1: P‐T‐X‐d Constraints of a Poly‐Metamorphic Terrane” by A. Ramírez‐Salazar et al. and “Tectonics of the Isua Supracrustal Belt 2: Microstructures R

Publisher: American Geophysical Union (AGU)

Date: 05-2022

DOI: 10.1029/2021TC007036

Abstract: The two Isua supracrustal belt area (Greenland) papers by Zuo et al. (2021, 0.1029/2020tc006514 ) and Ramírez‐Salazar et al. (2021, 0.1029/2020TC006516 ) contain no evidence supporting an Eoarchean “heat‐pipe” geodynamic regime and yet no evidence negating a mobile lid one. From quartz micro‐fabric studies, Zuo et al. (2021, 0.1029/2020tc006514 ) argued for Eoarchean “relatively equal strain distributed across the belt.” This contradicts clear meso‐ and macro‐scale evidence for strongly heterogeneous Eoarchean deformation before the later deformed and metamorphosed ∼3,500 to 2,750 Ma Ameralik dykes were intruded. The Zuo et al. strain indicators relate to syn‐ hibolite facies Neoarchean basin and dome formation throughout the ∼250 km extent of the Eoarchean gneiss complex. Ramírez‐Salazar et al. (2021, 0.1029/2020TC006516 ) argued the Isua area's metamorphic signature reflects a uniform Eoarchan “heat‐pipe” geodynamic regime. However, observed Eoarchean tectonothermal conditions are more erse, including ultra‐high‐pressure relicts in peridotite lenses with supra‐subduction zone attributes, and are incompatible with a “heat‐pipe” regime.

In support of rare relict ∼3700 Ma stromatolites from Isua (Greenland)

Publisher: Elsevier BV

Date: 05-2021

DOI: 10.1016/J.EPSL.2021.116850

Titanium and iron isotopic records of granitoid crust production in diverse Archean cratons

Publisher: Elsevier BV

Date: 10-2023

DOI: 10.1016/J.EPSL.2023.118342

Australian National University

Location: Australia

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Discovery Projects - Grant ID: DP170100715

Start Date: 04-2017

End Date: 12-2021

Amount: $270,000.00

Funder: Australian Research Council

Discovery Projects - Grant ID: DP120100273

Start Date: 2012

End Date: 12-2016

Amount: $250,000.00

Funder: Australian Research Council

Discovery Projects - Grant ID: DP0342794

Start Date: 2003

End Date: 12-2005

Amount: $162,000.00

Funder: Australian Research Council

Discovery Projects - Grant ID: DP180100103

Start Date: 04-2018

End Date: 06-2023

Amount: $333,357.00

Funder: Australian Research Council

Discovery Projects - Grant ID: DP0342709

Start Date: 2003

End Date: 12-2005

Amount: $300,000.00

Funder: Australian Research Council

Linkage Infrastructure, Equipment And Facilities - Grant ID: LE0560868

Start Date: 2005

End Date: 12-2007

Amount: $552,475.00

Funder: Australian Research Council

Linkage Infrastructure, Equipment And Facilities - Grant ID: LE100100064

Start Date: 09-2010

End Date: 12-2010

Amount: $450,000.00

Funder: Australian Research Council

Linkage Infrastructure, Equipment And Facilities - Grant ID: LE140100023

Start Date: 2014

End Date: 12-2014

Amount: $360,000.00

Funder: Australian Research Council