New Isotopic Constraints on the Age of the Halls Reward Metamorphics, North Queensland, Australia: Delamerian Metamorphic Ages and Grenville Detrital Zircons

Nishiya, Tatsuo; Watanabe, Tsutomu; Yokoyama, Kenichi; Kuramoto, Yoshiyuki

doi:10.1016/s1342-937x(05)70973-4

Cited by 19 publications

(4 citation statements)

References 16 publications

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“…500 Ma (Withnall et al 1996). Similar metamorphic ages (510-500 Ma) have also been reported from the Greenvale Province (Nishiya et al 2003) and Charters Towers Province ( Jell 2013, p. 145).…”

Section: Cambrian Contractional Deformation (520-490 Ma)supporting

confidence: 78%

The Tasmanides: Phanerozoic Tectonic Evolution of Eastern Australia

Rosenbaum

2018

Annu. Rev. Earth Planet. Sci.

121

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The Tasmanides occupy the eastern third of Australia and provide an extensive record of the evolution of the eastern Gondwanan convergent plate boundary from the Cambrian to the Triassic. This article presents a summary of the primary building blocks (igneous provinces and sedimentary basins) within the Tasmanides, followed by a discussion of the timing and extent of deformation events. Relatively short episodes of contractional deformation alternated with longer periods of crustal extension accompanied by voluminous magmatism. This behavior was likely controlled by plate boundary migration (trench retreat and advance) that was also responsible for bending and segmentation of the convergent plate margin. As a result, the Tasmanides were subjected to at least three major phases of oroclinal bending, in the Silurian, Devonian, and Permian. The most significant segmentation likely occurred at ∼420–400 Ma along a lithospheric-scale boundary that separated the northern and southern parts of the Tasmanides.

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Section: Cambrian Contractional Deformation (520-490 Ma)supporting

confidence: 78%

The Tasmanides: Phanerozoic Tectonic Evolution of Eastern Australia

Rosenbaum

2018

Annu. Rev. Earth Planet. Sci.

121

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“…On the basis of the youngest coherent group of detrital zircons ages other late Middle to Late Cambrian quartzose successions are inferred for the Thomson Fold Belt. These include the Halls Reward Metamorphics of the Greenvale Province [ Nishiya et al , 2003], located 170 km west‐northwest of the Argentine Metamorphics, and the upper part of the Anakie Metamorphic Group in addition to a late Neoproterozoic unit in the lower Anakie Metamorphic Group [ Fergusson et al , 2001], which occur 300–400 km south of the Charters Towers Province.…”

Section: Discussionmentioning

confidence: 99%

“…An Early Silurian orogenic event has been recognized for the southwestern Hodgkinson–Broken River Fold Belt [ Arnold and Henderson , 1976], affecting diverse rock systems that include Early Ordovician siliceous turbidites, Late Ordovician volcanic and volcaniclastic rocks, and mafic‐ultramafic rocks of uncertain age [ Withnall and Lang , 1993]. The Greenvale Province occurs west of the Hodgkinson–Broken River Fold Belt (Figure 2) and contains tectonized Early Paleozoic rock assemblages [ Nishiya et al , 2003]. The Anakie Metamorphic Group, extensively exposed as a basement inlier surrounded by interior basins of the northern New England Fold Belt (Figure 1), is considered to represent an extension of the Delamerian orogeny in northeastern Australia [ Withnall et al , 1996; Fergusson et al , 2001].…”

Section: Regional Settingmentioning

confidence: 99%

Structural, metamorphic, and geochronological constraints on alternating compression and extension in the Early Paleozoic Gondwanan Pacific margin, northeastern Australia

Fergusson

Henderson

Withnall³

et al. 2007

Tectonics

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The Ross‐Delamerian orogenic belt formed along the early Paleozoic active Pacific margin of the newly merged Gondwana supercontinent. In its northernmost segment in the Townsville region of northeastern Australia, we have identified a short contractional phase of the Delamerian orogeny in the Argentine Metamorphics postdating formation of a mafic breccia with a U‐Pb zircon age of 500 ± 4 Ma. Contraction was followed by widespread inferred extensional deformation with formation of flat‐lying foliation, domal features, and amphibolite grade and greenschist retrograde metamorphism all synchronous with latest Cambrian to Early Ordovician extensional back‐arc volcanism, sedimentation, and intrusions. One of these intrusions gives a U‐Pb zircon age of 480 ± 4 Ma. Foliation related to the extensional deformation is crosscut by a late granodiorite dike with a U‐Pb zircon age of 461 ± 4 Ma. Late east‐west contractional deformation affected the higher‐grade part of the assemblage. In contrast to the Ross‐Delamerian orogenic belt in the Transantarctic Mountains and southeastern Australia, the orogenic belt in northeastern Australia was affected by a short episode of contraction at ∼495 Ma followed by long‐lived back‐arc extension from ∼490 Ma to 460 Ma with subsequent contractional deformation.

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“…The possible existence of the Delamerian-Thomson Orocline (Figure 9a) has been proposed by Rosenbaum (2018) based on the fact that rocks from both the southwestern Tasmanides (Delamerian Orogen, including the Koonenberry Belt) and northeastern Tasmanides (e.g., Anakie, Charters Towers and Greenvale provinces) experienced deformation and metamorphism during the Cambrian Delamerian Orogeny (Foden et al, 2006;Nishiya et al, 2003;Withnall et al, 1996). It is unknown whether or not these two segments are connected (e.g., through an~E-W Delamerian basement underlying the southern Thomson Orogen), and additional kinematic data (e.g., from paleomagnetic studies) are needed in order to test whether, for example, the Koonenberry Belt and Anakie Inlier represent displaced segments of an originally continuous belt (Figure 9b).…”

Section: Geodynamic Implicationsmentioning

confidence: 99%

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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New Isotopic Constraints on the Age of the Halls Reward Metamorphics, North Queensland, Australia: Delamerian Metamorphic Ages and Grenville Detrital Zircons

Cited by 19 publications

References 16 publications

The Tasmanides: Phanerozoic Tectonic Evolution of Eastern Australia

The Tasmanides: Phanerozoic Tectonic Evolution of Eastern Australia

Structural, metamorphic, and geochronological constraints on alternating compression and extension in the Early Paleozoic Gondwanan Pacific margin, northeastern Australia

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

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