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Insights from easternmost Tethys: Slab rollback, mantle exhumation, and UHT metamorphism in Eastern Indonesia (2018)
Conference Proceeding
Pownall, J., Hall, R., Forster, M., & Lister, G. (2018). Insights from easternmost Tethys: Slab rollback, mantle exhumation, and UHT metamorphism in Eastern Indonesia. In EGU General Assembly Conference Abstracts

The collision of Australia with SE Asia around 23 million years ago marked the closure of the eastern Tethys. Continued convergence of these two continents has since resulted in a complex array of active subduction zones, young mountain belts, and ne... Read More

A low-angle normal fault earthquake and tsunami: The 1852 Banda Sea Earthquake, Eastern Indonesia (2018)
Conference Proceeding
Pownall, J., Pranantyo, I., Cummins, P., & Griffin, J. (2018). A low-angle normal fault earthquake and tsunami: The 1852 Banda Sea Earthquake, Eastern Indonesia. In AGU Fall Meeting Abstracts

In November 1852, the Banda Islands, Eastern Indonesia suffered a devastating earthquake which was followed fifteen minutes later by a tsunami with up to eight meters height. Strong shaking was also felt on Ambon, Saparua, and Haruku Islands. The tsu... Read More

Miocene UHT granulites from Seram, eastern Indonesia: a geochronological–REE study of zircon, monazite and garnet (2018)
Book Chapter
Pownall, J. M., Armstrong, R. A., Williams, I. S., Thirlwall, M. F., Manning, C. J., & Hall, R. (2019). Miocene UHT granulites from Seram, eastern Indonesia: a geochronological–REE study of zircon, monazite and garnet. In S. Ferrero, P. Lanari, P. Goncalves, & E. Grosch (Eds.), Metamorphic Geology: Microscale to Mountain Belts, 167-196. Geological Society. https://doi.org/10.1144/SP478.8

The island of Seram, eastern Indonesia, incorporates Miocene ultrahigh-temperature (UHT; greater than 900°C) garnet–sillimanite granulites that formed by extensional exhumation of hot mantle rocks behind the rolling-back Banda Arc. UHT metamorphic co... Read More

Reconstructing subducted oceanic lithosphere by "reverse-engineering" slab geometries: the northern Philippine Sea Plate (2017)
Journal Article
Pownall, J. M., Lister, G. S., & Spakman, W. (2017). Reconstructing subducted oceanic lithosphere by "reverse-engineering" slab geometries: the northern Philippine Sea Plate. Tectonics, 36(9), 1814-1834. https://doi.org/10.1002/2017TC004686

Subducting slabs commonly acquire complex geometries from the migration of subduction trenches, slab‐mantle interaction, slab tearing, and collision of slabs at depth. Although it is possible to construct three‐dimensional models of subducted slabs u... Read More

Hot lherzolite exhumation, UHT migmatite formation, and acid volcanism driven by Miocene rollback of the Banda Arc, eastern Indonesia (2017)
Journal Article
Pownall, J. M., Hall, R., & Armstrong, R. A. (2017). Hot lherzolite exhumation, UHT migmatite formation, and acid volcanism driven by Miocene rollback of the Banda Arc, eastern Indonesia. Gondwana Research, 51, 92-117. https://doi.org/10.1016/j.gr.2017.07.003

The northern Banda Arc, eastern Indonesia, exposes upper mantle/lower crustal complexes comprising lherzolites and granulite facies migmatites of the ‘Kobipoto Complex’. Residual garnet–sillimanite granulites, which contain spinel + quartz inclusions... Read More

Tectonometamorphic evolution of Seram and Ambon, eastern Indonesia: Insights from 40 Ar/ 39 Ar geochronology (2016)
Journal Article
Pownall, J. M., Forster, M. A., Hall, R., & Watkinson, I. M. (2017). Tectonometamorphic evolution of Seram and Ambon, eastern Indonesia: Insights from 40 Ar/ 39 Ar geochronology. Gondwana Research, 44, 35-53. https://doi.org/10.1016/j.gr.2016.10.018

The island of Seram, eastern Indonesia, experienced a complex Neogene history of multiple metamorphic and deformational events driven by Australia–SE Asia collision. Geological mapping, and structural and petrographic analysis has identified two main... Read More

Rolling open Earth's deepest forearc basin (2016)
Journal Article
Pownall, J., Hall, R., & Lister, G. (2016). Rolling open Earth's deepest forearc basin. Geology, 44(11), 947-950. https://doi.org/10.1130/G38051.1

The Weber Deep—a 7.2-km-deep forearc basin within the tightly curved Banda arc of eastern Indonesia—is the deepest point of the Earth’s oceans not within a trench. Several models have been proposed to explain the tectonic evolution of the Banda arc i... Read More

UHT metamorphism on Seram, eastern Indonesia: reaction microstructures and P–T evolution of spinel-bearing garnet–sillimanite granulites from the Kobipoto Complex (2015)
Journal Article
Pownall, J. M. (2015). UHT metamorphism on Seram, eastern Indonesia: reaction microstructures and P–T evolution of spinel-bearing garnet–sillimanite granulites from the Kobipoto Complex. Journal of Metamorphic Geology, 33(9), 909-935. https://doi.org/10.1111/jmg.12153

The island of Seram, part of the northern limb of the Banda Arc in eastern Indonesia, exposes an extensive Mio‐Pliocene granulite facies migmatite complex (the Kobipoto Complex) comprising voluminous leucosome‐rich diatexites and scarcer Al–Fe‐rich r... Read More

Earth's youngest known ultrahigh-temperature granulites discovered on Seram, eastern Indonesia (2014)
Journal Article
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

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 rare... Read More

Extreme extension across Seram and Ambon, eastern Indonesia: evidence for Banda slab rollback (2013)
Journal Article
Pownall, J., Hall, R., & Watkinson, I. M. (2013). Extreme extension across Seram and Ambon, eastern Indonesia: evidence for Banda slab rollback. Solid Earth, 4, 277-314. https://doi.org/10.5194/se-4-277-2013

The island of Seram, which lies in the northern part of the 180°-curved Banda Arc, has previously been interpreted as a fold-and-thrust belt formed during arc-continent collision, which incorporates ophiolites intruded by granites thought to have bee... Read More

Shallow laccolithic emplacement of the Land’s End and Tregonning granites, Cornwall, UK: evidence from aureole field relations and PT modeling of cordierite-anthophyllite hornfels (2012)
Journal Article
Pownall, J. M., Waters, D. J., Searle, M. P., Shail, R. K., & Robb, L. J. (2012). Shallow laccolithic emplacement of the Land’s End and Tregonning granites, Cornwall, UK: evidence from aureole field relations and PT modeling of cordierite-anthophyllite hornfels. Geosphere, 8(6), 1467-1504. https://doi.org/10.1130/GES00802.1

The Land’s End and Tregonning-Godolphin granites of the >250 km-long Permian Cornubian Batholith are heterogeneous medium- to coarse-grained peraluminous biotite-, tourmaline-, and lithium-mica granites traditionally thought to be emplaced as massive... Read More