Orogen-perpendicular structures in the central Tasmanides and implications for the Paleozoic tectonic evolution of eastern Australia

Abdullah, Rashed; Rosenbaum, Gideon

doi:10.1016/j.tecto.2016.11.031

Cited by 14 publications

(39 citation statements)

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“…The aeromagnetic data from the southern Thomson Orogen (Figure ) show that curvilinear E‐W trending structures correspond to relatively long wavelength linear geophysical anomalies (Abdullah & Rosenbaum, ). The kinematic analysis indicates a dominantly dextral strike‐slip and transpressional movement along these faults (Abdullah & Rosenbaum, ; Dunstan et al, ), and the structural relationships indicate multiphase reactivation history, with possible deformation during the Benambran (Late Ordovician to Middle Silurian) and Tabberabberan (late Early to Middle Devonian) orogenies (Abdullah & Rosenbaum, ).…”

Section: Discussionmentioning

confidence: 99%

“…(a) Pseudocolour RTP aeromagnetic image and (b) interpreted solid geology map of the southern Thomson Orogen with structural interpretation (after Abdullah & Rosenbaum, ; Purdy et al, ). The blue lines represent the location of deep seismic transects 05GATL 1 and 05GATL 2 (shown in Figure d).…”

Section: Discussionmentioning

confidence: 99%

“…In addition, there are widespread late Silurian to Devonian basins south of the Olepoloko Fault (Darling Basin) and in the Koonenberry Belt (Bancannia Trough; Figure c; Bembrick, ; Mathieson et al, ; Neef, ). Interpretation of a deep seismic transect across the Thomson‐Lachlan boundary (Figure d) suggests that the deposition of the Darling Basin was initiated in a synrift tectonic setting during the Silurian to Early Devonian and was followed by inversion of major structures during the Middle to Late Devonian (Abdullah & Rosenbaum, ).…”

Section: Geological Settingmentioning

confidence: 99%

“…(c) Generalized map of eastern Australia showing exposed geological units and borehole data (borehole information present the lowermost stratigraphic units on the site). (d) Interpreted seismic transect across the Thomson‐Lachlan boundary (after Abdullah & Rosenbaum, ). (Abbreviations used in maps (b) and (c): AB, Adavale and associated basins [B, Barrolka Trough; WT, Warrabin Trough]; BB, Burdekin Basin; BT, Bancannia Trough; ByB, Belyando Basin; CB, Cobar Basin; CC, Curnamona Craton; DaB, Darling Basin; DB, Drummond Basin; KB, Koonenberry Belt; LESZ, Louth‐Eumarra Shear Zone; MA, Macquarie Arc; NR, Nebine Ridge; OF, Olepoloko Fault; PT, Paka Tank Trough; STO, Southern Thomson Orogen; TB, Timbury Hills Basin).…”

Section: Introductionmentioning

confidence: 99%

“…Geophysical data indicate that the southern Thomson Orogen is underlain by a thick (~40–45 km) crust (Abdullah & Rosenbaum, ; Glen et al, ), but the central and northern parts of the orogen are characterized by a relatively thin layered crust (Finlayson, ; Finlayson, Leven, et al, ; Finlayson, Wake‐Dyster, et al, ; Glen, ; Korsch et al, ; Milligan et al, ; Murray & Finlayson, ; Spampinato et al, ). The nature of this basement, however, is unknown, because of the presence of sedimentary cover.…”

Section: Introductionmentioning

confidence: 99%

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Devonian Crustal Stretching in the Northern Tasmanides (Australia) and Implications for Oroclinal Bending

Abdullah

Rosenbaum

2018

JGR Solid Earth

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The Tasmanides in eastern Australia exhibit a number of orogenic curvatures (oroclines), and possibly, a continental‐scale bend that defines the continuation of the Delamerian Orogen with the Thomson Orogen. We provide an insight into the geodynamic processes associated with the origin of this orocline. We present interpretations of seismic reflection profiles and potential field data from the Thomson Orogen, which provide information on the crustal architecture and unravel major structures and kinematic relationships. Results show that a large area in the northern Tasmanides is underlain by thinned crust, bounded in the north and south by ~E‐W trending geophysical features with apparent sinistral and dextral sense of kinematics, respectively. Within the highly extended crust of the Thomson Orogen, there is evidence for widespread Devonian basins bounded by normal faults. In stark contrast to the southern Tasmanides, where rocks show evidence for an earlier (Silurian) episode of extension and Devonian contractional deformation, no evidence for Silurian synrift sedimentation is observed in the Thomson Orogen. Evidence for ~E‐W trending sinistral and dextral crustal‐scale shear zones in the northern and southern boundaries of the Thomson Orogen, respectively, may represent tear faults, which were active during the Early Devonian and were possibly accompanied by tear‐related magmatism. We suggest that crustal stretching in the northern Tasmanides was associated with Devonian back‐arc extension in response to trench retreat, bounded by zones of slab‐tearing and crustal segmentation that ultimately led to the development of the Delamerian‐Thomson Orocline.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Devonian Crustal Stretching in the Northern Tasmanides (Australia) and Implications for Oroclinal Bending

Abdullah

Rosenbaum

2018

JGR Solid Earth

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Receiver function imaging of mantle transition zone discontinuities and the origin of volcanism beneath Libya

Lemnifi

Browning

Elshaafi

et al. 2019

Journal of Geodynamics

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The origin of magma at Libya's volcanic provinces is still poorly understood. In order to constrain these sources we report results of the first P-to-S receiver function investigation of the 410 km and 660 km depth discontinuities bounding the mantle transition zone (MTZ) beneath Libya. The dataset used by this study is a combination of eighteen seismic stations belonging to the Libyan Center for Remote Sensing and Space Science and the Incorporated Research Institutions for Seismology Data Management Center. The average thickness of the MTZ is found to be 249±14 km, which is similar to the global average. A 10 km thinning of the MTZ was observed beneath the Miocene -Holocene volcanic provinces in central Libya, suggesting higher-than-normal temperatures in those parts of the MTZ. Our preferred model suggests that the origin of volcanism in Libya is due to higher temperatures in the MTZ beneath this region. However, in Eastern Libya, the thickness of the MTZ increases from 249 km to 270 km which indicates a colder-than-normal MTZ which may relate to ancient subducted slabs due to the Africa-Europe convergence since the late Mesozoic.

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Structural development and tectonostratigraphic evolution of the Sylhet Trough (northeastern Bengal Basin) in the context of Cenozoic Himalayan Orogeny: Insights from geophysical data interpretation

Abdullah

Aurthy

Khanam³

et al. 2022

Marine and Petroleum Geology

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Orogen-perpendicular structures in the central Tasmanides and implications for the Paleozoic tectonic evolution of eastern Australia

Cited by 14 publications

References 65 publications

Devonian Crustal Stretching in the Northern Tasmanides (Australia) and Implications for Oroclinal Bending

Devonian Crustal Stretching in the Northern Tasmanides (Australia) and Implications for Oroclinal Bending

Receiver function imaging of mantle transition zone discontinuities and the origin of volcanism beneath Libya

Structural development and tectonostratigraphic evolution of the Sylhet Trough (northeastern Bengal Basin) in the context of Cenozoic Himalayan Orogeny: Insights from geophysical data interpretation

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