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Tectonics and crustal stresses in Yatsushiro Sea and its relation to the causative faults of the 2016 Kumamoto earthquakes.
Published in Ömer Aydan, Takashi Ito, Takafumi Seiki, Katsumi Kamemura, Naoki Iwata, 2019 Rock Dynamics Summit, 2019
M. Yagi, I. Sakamoto, Ö. Aydan
The Kyushu area is characterized by east-west transpression accompanying the subduction of the Philippine Sea plate in the northwest direction and transtension of Beppu-Shimabara Graben in central Kyushu to the north and south. In Shikoku and Kyushu, Ikeda et al (2009) pointed out pull-apart basin formation by step-over along Median Tectonic Line Active Fault System (MTLAFS), and almost MTLAFS stress condition has a transpression sense.
Tectonic subsidence and uplift within Canterbury Basin, South Island, New Zealand
Published in New Zealand Journal of Geology and Geophysics, 2023
Katherine Dvorak, Michelle Kominz, Martin Crundwell
Collision of the Pacific and Australian plates initiated the proto-Alpine Fault Zone during the Oligocene, at about 27 Ma (Cooper et al. 1987; Furlong and Kamp 2009). At this time, subduction was initiated at the Puysegur Trench and the Hikurangi/Kermadec Trough (Figure 1). Dextral slip along the proto-Alpine Fault caused subduction along the Puysegur Trench to migrate to the north, while subduction along the Hikurangi/Kermadec Trench migrated to the south (Wood and Stagpoole 2007; Furlong and Kamp 2009). Transpression along the Alpine Fault began as early as 27 Ma (Furlong and Kamp 2009). Between 6 and 12 Ma, the compressional component of motion on the Alpine Fault increased (Cande and Stock 2004b; Furlong and Kamp 2009; Jiao and Seward 2017). Transpression in the South Island resulted in uplift and increased sedimentation rates, forming the regressive Maui Supergroup (Mortimer et al. 2014). These sedimentary sections are best preserved in the many offshore sedimentary basins (Mortimer et al. 2014; Adams et al. 2017). In particular, the offshore Canterbury Basin includes a well-defined shelf and slope morphology midway between the two convergent plate boundaries (Figure 1).
Potential field modelling and U–Pb geochronology reveal the pluton emplacement dynamics of the Lower Devonian Tarnagulla Granodiorite, southeast Australia
Published in Australian Journal of Earth Sciences, 2022
M. P. Sambrooks, M. A. McLean, R. A. Cayley, R. Maas, R. J. Duncan, C. P. Cairns, J. Ramezani
These fault movements can be related to changes in the regional stress regime in this sector of the western LFB. The transtensional component of the structural history complements economic studies at Tarnagulla including that of Krokowski De Vickerod et al. (2001) and complements and further constrains the structural history established in other mine sites (e.g. Stawell gold mine) where the transpressional fault history can be unravelled from structural mapping, while transtensional components of the history are more difficult to decipher because they are commonly intruded by dykes (Miller et al., 2006). The progressive nature of stress-changes such as these, with indications of transitions between transtension, strike-slip and transpression all in close succession, might help explain the complexity of overprinting structures preserved in orogenic gold mines across the Victorian goldfields.
Volcanoes buried in Te Riu-a-Māui/Zealandia sedimentary basins
Published in New Zealand Journal of Geology and Geophysics, 2020
Alan Bischoff, Andrea Barrier, Mac Beggs, Andrew Nicol, Jim Cole, Tusar Sahoo
Zealandia is a region of 4.9 million km2 largely (ca 95%) submerged in the Pacific Ocean and Tasman Sea (Mortimer and Campbell 2017). It consists of Cambrian-Early Cretaceous basement overlain by Late Cretaceous-Cenozoic sedimentary and igneous rocks (Laird and Bradshaw 2004; Mortimer et al. 2018). For most of the Mesozoic, Zealandia formed the active convergent south-eastern margin of the Gondwana supercontinent, which separated from Australia and Antarctica in the Late Cretaceous (e.g. Laird 1993; Sutherland et al. 2001; Mortimer 2004). An initial phase of crustal extension (ca 105–83 Ma) leading to continental break-up gave rise to several rift basins throughout Zealandia. These basins were subsequently filled with Late Cretaceous and younger strata up to 10 km thick. In and around the New Zealand landmass, these basins were affected by Eocene to Recent plate boundary deformation associated with the Hikurangi and Puysegur subduction zones, and dextral strike-slip transpression along the Alpine Fault (e.g. Walcott 1978; King et al. 1999; Nicol et al. 2007; Figures 1 and 2).