Jonathan M. Pownall
Earth's youngest known ultrahigh-temperature granulites discovered on Seram, eastern Indonesia
Pownall, Jonathan M.; Hall, Robert; Armstrong, Richard A.; Forster, Marnie A.
Authors
Robert Hall
Richard A. Armstrong
Marnie A. Forster
Abstract
Episodes of ultrahigh-temperature (UHT, ≥900 °C) granulite metamorphism have been recorded in mountain belts since the Neoarchean. However, evidence for the tectonic mechanisms responsible for the generation of such extreme thermal conditions is rarely preserved. Here we report the discovery of 16 Ma UHT granulites—the youngest identified at the Earth’s surface—from the Kobipoto Mountains of Seram in eastern Indonesia. UHT conditions were produced by a modern tectonic system in which slab rollback–driven lithospheric extension caused core complex–style exhumation of hot subcontinental lithospheric mantle. Overlying continental crust, heated and metamorphosed by exhumed lherzolites, developed spinel + quartz and sapphirine-bearing residual assemblages, shown by phase equilibria modeling to have required temperatures of ∼950 °C at ∼8 kbar pressure. Seram is therefore a possible modern analogue for ancient orogens that incorporate UHT granulites
Citation
Pownall, J. M., Hall, R., Armstrong, R. A., & Forster, M. A. (2014). Earth's youngest known ultrahigh-temperature granulites discovered on Seram, eastern Indonesia. Geology, 42(4), 279-282. https://doi.org/10.1130/G35230.1
Journal Article Type | Article |
---|---|
Acceptance Date | Dec 19, 2013 |
Online Publication Date | Mar 9, 2017 |
Publication Date | Apr 1, 2014 |
Deposit Date | Sep 3, 2019 |
Journal | Geology |
Print ISSN | 0091-7613 |
Publisher | Geological Society of America |
Peer Reviewed | Peer Reviewed |
Volume | 42 |
Issue | 4 |
Pages | 279-282 |
DOI | https://doi.org/10.1130/G35230.1 |
Public URL | https://hull-repository.worktribe.com/output/2598011 |
Publisher URL | https://pubs.geoscienceworld.org/gsa/geology/article-standard/42/4/279/131491/earth-s-youngest-known-ultrahigh-temperature |
You might also like
Neogene extension on Seram: a new tectonic model for the northern Banda Arc
(2014)
Presentation / Conference Contribution
Rolling open Earth's deepest forearc basin
(2016)
Journal Article
Downloadable Citations
About Repository@Hull
Administrator e-mail: repository@hull.ac.uk
This application uses the following open-source libraries:
SheetJS Community Edition
Apache License Version 2.0 (http://www.apache.org/licenses/)
PDF.js
Apache License Version 2.0 (http://www.apache.org/licenses/)
Font Awesome
SIL OFL 1.1 (http://scripts.sil.org/OFL)
MIT License (http://opensource.org/licenses/mit-license.html)
CC BY 3.0 ( http://creativecommons.org/licenses/by/3.0/)
Powered by Worktribe © 2024
Advanced Search