Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/133828
Citations | ||
Scopus | Web of Science® | Altmetric |
---|---|---|
?
|
?
|
Type: | Journal article |
Title: | Jurassic arc: reconstructing the lost world of eastern Gondwana |
Author: | Foley, E.K. Henderson, R.A. Roberts, E.M. Kemp, A.I.S. Todd, C.N. Knutsen, E.M. Fisher, C. Wainman, C.C. Spandler, C. |
Citation: | Geology (Boulder), 2021; 49(11):1391-1396 |
Publisher: | Geological Society of America |
Issue Date: | 2021 |
ISSN: | 0091-7613 1943-2682 |
Statement of Responsibility: | Elliot K. Foley, R.A. Henderson, E.M. Roberts, A.I.S. Kemp, C.N. Todd, E.M. Knutsen, C. Fisher, C.C. Wainman and Carl Spandler |
Abstract: | The tectonic setting of the Australian sector of the eastern Gondwanan margin during the Jurassic and Cretaceous is enigmatic. Whether this involved convergent tectonism and a long-lived continental magmatic arc or rift-related extension unrelated to subduction is debated. The paucity of Australian Jurassic–Cretaceous igneous outcrops makes resolving these competing models difficult. We used the detrital zircon record of the Jurassic–Cretaceous Great Australian Superbasin (GAS) as a proxy for igneous activity. We attribute the persistent magmatism recorded in GAS sedimentary fill throughout the Mesozoic to ca. 95 Ma to continuation of the established Paleozoic continental arc system. The detrital zircon record signals short (~10 m.y.) pulses of elevated Jurassic and Cretaceous magmatic activity and strongly positive εHf values, indicating juvenile crust or mantle-derived magmatism. Margin reconstruction indicates sustained continental growth at rates of at least ~55 km³ km⁻¹ m.y.⁻¹, mainly to the tract now represented by submerged northern Zealandia, due to the retreat of this arc system. We posit that arc retreat was a key factor in rapid crust generation and preservation, and that continental sedimentary systems globally may host cryptic records of juvenile crustal addition that must be considered in estimating crustal growth rates along convergent plate margins. |
Rights: | © 2021 Geological Society of America. For permission to copy, contact editing@geosociety.org. |
DOI: | 10.1130/G49328.1 |
Grant ID: | http://purl.org/au-research/grants/arc/DP180102851 http://purl.org/au-research/grants/arc/LE100100203 http://purl.org/au-research/grants/arc/LE150100013 |
Published version: | http://dx.doi.org/10.1130/g49328.1 |
Appears in Collections: | Geology & Geophysics publications |
Files in This Item:
There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.