Paleomagnetism of the Hart Dolerite (Kimberley, Western Australia) – A two-stage assembly of the supercontinent Nuna?

Kirscher, Uwe; Liu, Yebo; Li, Z.X.; Mitchell, Ross N.; Pisarevsky, S.; Denyszyn, Steven W.; Nordsvan, Adam R.

doi:10.1016/j.precamres.2018.12.026

Cited by 47 publications

(20 citation statements)

References 71 publications

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“…1.3 Ga. Comparing these new data with coeval poles from Laurentia (Murthy, 1978) using the modified Australia-Laurentia fit from 1.65 to 1.58 Ga (Euler rotation of Kirscher et al [2019]; Fig. 2; 1 Supplemental Material.…”

Section: Australia-laurentia Connectionmentioning

confidence: 94%

“…1.6 Ga (Betts et al, 2016); or (2) that a small ocean existed between the continents at 1.8 Ga that closed by ca. 1.6 Ga (Betts et al, 2008;Pisarevsky et al, 2014a;Nordsvan et al, 2018;Kirscher et al, 2019). Nevertheless, this reorganization indicates that assembly of Nuna was a protracted process and took place until at least 1.6 Ga, which is supported by concurrent orogenesis in eastern Australian and western Laurentia (Pourteau et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…Reinvestigation of the available paleomagnetic data for roughly the same time interval, including new data for ca. 1.8 Ga (Kirscher et al, 2019), suggests that the original proto-SWEAT connection is valid at ca. 1.8 Ga, but a reorganization between ca.…”

Section: Introductionmentioning

confidence: 99%

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Paleomagnetic constraints on the duration of the Australia-Laurentia connection in the core of the Nuna supercontinent

Kirscher

Mitchell

Liu

et al. 2020

Geology

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The Australia-Laurentia connection in the Paleoproterozoic to Mesoproterozoic supercontinent Nuna is thought to have initiated by ca. 1.6 Ga when both continents were locked in a proto-SWEAT (southwestern U.S.–East Antarctic) configuration. However, the longevity of that configuration is poorly constrained. Here, we present a new high-quality paleomagnetic pole from the ca. 1.3 Ga Derim Derim sills of northern Australia that suggests Australia and Laurentia were in the same configuration at that time. This new paleopole also supports a connection between Australia and North China and, in conjunction with previously reported data from all continents, indicates that the breakup of Nuna largely occurred between ca. 1.3 and 1.2 Ga.

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Section: Australia-laurentia Connectionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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Paleomagnetic constraints on the duration of the Australia-Laurentia connection in the core of the Nuna supercontinent

Kirscher

Mitchell

Liu

et al. 2020

Geology

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“…Among these, the configuration and evolution history of both Rodinia and Nuna are still controversial (Evans et al, 2016). Recent paleomagnetic and geological studies suggest that Nuna may have formed either at ~1.5–1.4 Ga (Meert & Santosh, 2017) or ~ 1.6 Ga (Furlanetto et al, 2013; Kirscher et al, 2019; Nordsvan et al, 2018; Pisarevsky, Elming, et al, 2014; Pourteau et al, 2018), much later than the previously proposed 2.0–1.8 Ga (Zhang, Li, et al, 2012; Zhao et al, 2002). However, its break‐up process and timing are still poorly constrained, possibly starting by ~1.45–1.38 Ga (Pisarevsky, Elming, et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

The 1.24–1.21 Ga Licheng Large Igneous Province in the North China Craton: Implications for Paleogeographic Reconstruction

Wang

Peng

et al. 2020

JGR Solid Earth

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Detailed geochronological, geochemical, and paleomagnetic studies of mafic dyke swarms, often associated with mantle plumes, can provide unique constraints on paleogeographic reconstructions. have been identified in the eastern North China Craton. Geochemical data indicate subalkaline to alkaline basalt compositions with OIB-like trace element signatures and an intraplate tectonic setting. In addition to these geochemical signatures, the radiating geometry of these dykes also suggests a 1.24-1.21 Ga large igneous province caused by a mantle plume event. A new~1.24 Ga paleomagnetic pole at 2.0°N, 165.1°E, A 95 = 11.0°, N = 9 and an~1.21 Ga VGP at −23.0°N, 92.5°E, dp/dm = 4.7°/7.8°have been obtained from these dykes, with the 1.24 Ga pole supported by positive baked contact test. Our paleomagnetic analyses suggest that the North China Craton and the proto-Australian continent could have been separated by 1.24-1.21 Ga from an established Nuna connection at ca. 1.32 Ga. By comparison with Laurentia paleopoles, we present the paleogeography of dispersing North China, proto-Australian, and Laurentia cratons in the late Mesoproterozoic during the breakup of the supercontinent Nuna.

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“…The final assembly of the supercontinent Nuna (Figure 1a) is suggested to have occurred after the collision between Australia and Laurentia (North America) at circa 1600 Ma (Betts et al, 2016;Kirscher et al, 2020Kirscher et al, , 2019Pehrsson et al, 2016;Pisarevsky et al, 2014). This orogenic event (i.e., Isan Orogeny) was widely recorded in Proterozoic inliers (Figure 1b) across NE Australia (Betts et al, 2016;Kirscher et al, 2019;Nordsvan et al, 2018;Pehrsson et al, 2016;Pisarevsky et al, 2014;Pourteau et al, 2018). Recent work by Nordsvan et al (2018) suggested that the oldest sedimentary rocks in the Georgetown Inlier (GTI) were likely sourced from Laurentia and Pourteau et al (2018) used garnet geochronology and thermodynamic modeling to document simultaneous collisional-type metamorphism in the Mount Isa (MTI) and Georgetown inliers at circa 1600 Ma (Figure 1b).…”

Section: Introductionmentioning

confidence: 99%

Structural Evolution of a 1.6 Ga Orogeny Related to the Final Assembly of the Supercontinent Nuna: Coupling of Episodic and Progressive Deformation

et al. 2020

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The poly-deformed Georgetown Inlier (GTI) in NE Australia has recently been suggested to record a 1.60 Ga orogenic event related to final Nuna assembly. However, the structural evolution of the inlier has remained poorly constrained at the regional scale, and major tectono-thermal events occurred at circa 1.55 Ga. The GTI is the type region for conceptualization of crenulation cleavage development and where the foliation intersection axes (FIAs) approach has been applied. We reevaluated both concepts by combining a multiscale petrostructural analysis with recent petrological and geochronological data. Three main deformation events (D1-D3) and associated composite fabrics (S1-S3) are identified in the GTI. The original NE orientation of 1.60 Ga D1 compressional structures is preserved in the low-grade western domain, and the associated composite S1 fabric is retained as microstructural relicts within circa 1.55 Ga D2 low-strain domains to the east. Extensional D2 structures, characterized by a pervasive, high-grade, composite S2 foliation throughout the central and eastern domains, are interpreted as the footwall of a regional N-S trending, W dipping crustal-scale detachment zone. Syn-D2 S-type granites formed at 1.55 Ga as the detachment evolved. D1 stage was associated with Nuna assembly, whereas D2 represents postcollisional extension. Progressive foliation development occurred twice in the GTI, at 1.60 (D1) and 1.55 Ga (D2), but the previous FIA analysis only records the 1.60 Ga event and cannot be easily reconciled with the regional structural analysis. This study highlights that a multiscale and multidisciplinary approach is required to unravel the structural history of orogenic belts.

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Paleomagnetism of the Hart Dolerite (Kimberley, Western Australia) – A two-stage assembly of the supercontinent Nuna?

Cited by 47 publications

References 71 publications

Paleomagnetic constraints on the duration of the Australia-Laurentia connection in the core of the Nuna supercontinent

Paleomagnetic constraints on the duration of the Australia-Laurentia connection in the core of the Nuna supercontinent

The 1.24–1.21 Ga Licheng Large Igneous Province in the North China Craton: Implications for Paleogeographic Reconstruction

Structural Evolution of a 1.6 Ga Orogeny Related to the Final Assembly of the Supercontinent Nuna: Coupling of Episodic and Progressive Deformation

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