What is underneath the juvenile Ordovician Macquarie Arc (eastern Australia)? A question resolved using Silurian intrusions to sample the lower crust

Zhang, Qing; Nutman, Allen P.; Buckman, Solomon; Bennett, Vickie C.

doi:10.1016/j.gr.2019.11.018

Cited by 4 publications

(6 citation statements)

References 55 publications

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“…The ages of the nearby units are after Zhang et al. (2020). Literature Bathurst data (gray symbols) are from Jeon and Williams (2018).…”

Section: Resultsmentioning

confidence: 99%

“…(2009), Zhang et al. (2020), Zhang, Buckman, Bennett, and Nutman (2019), Zhang, Buckman, Bennett, Nutman, and Song (2019), and Glen et al. (2011).…”

Section: Resultsmentioning

confidence: 99%

“…The New England Batholith data are from Phillips et al (2011), Shaw et al (2011), and Kemp et al (2009. Other literature data (marked with light gray symbols) are from Kemp et al (2009), Zhang et al (2020), Zhang, Buckman, Bennett, and, Song (2019), andGlen et al (2011). Bombo gabbro age data are from Alcorn (2016) and Hf data are from this study.…”

Section: Magmatic Record and Geodynamic Implicationsmentioning

confidence: 95%

“…Silurian–Devonian granites of the Tasmanides have been well documented on the basis of the S‐, I‐, and A‐type granite classification schemes (B. Chappell & White, 1992; Collins, 1996; Whalen et al., 1987) and U–Pb geochronology in recent years (e.g., Stirling et al., 2022; Zhang et al., 2020). However, very limited U–Pb dating or isotopic fingerprinting has been performed on the Carboniferous Bathurst Batholith.…”

Section: Previous Studiesmentioning

confidence: 99%

“…Aitchison & Flood, 1990 Temporal εHf variation (inherited zircon Hf isotope data were not included). The ages of the nearby units are after Zhang et al (2020). Literature Bathurst data (gray symbols) are from Jeon and Williams (2018).…”

Section: Magmatic Record and Geodynamic Implicationsmentioning

confidence: 99%

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

Zhang

Buckman

Mitchell

et al. 2023

Geochem Geophys Geosyst

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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.

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“…The ages of the nearby units are after Zhang et al. (2020). Literature Bathurst data (gray symbols) are from Jeon and Williams (2018).…”

Section: Resultsmentioning

confidence: 99%

“…(2009), Zhang et al. (2020), Zhang, Buckman, Bennett, and Nutman (2019), Zhang, Buckman, Bennett, Nutman, and Song (2019), and Glen et al. (2011).…”

Section: Resultsmentioning

confidence: 99%