North China block underwent simultaneous true polar wander and tectonic convergence in late Jurassic: New paleomagnetic constraints

Gao, Yangjun; Zhang, Shihong; Zhao, Hanqing; Ren, Qiang; Yang, Tianshui; Wu, Huaichun; Li, Haiyan

doi:10.1016/j.epsl.2021.117012

Cited by 21 publications

(24 citation statements)

References 44 publications

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“…2C). The prolonged upper tail corresponds to scenarios where the total pole motion is produced by TPW counteracted by tectonic motion, resembling the case interpreted for South China between 815 and 800 Ma ago (12) and North China in the late Jurassic (54), whereas the reduced lower tail corresponds to TPW and tectonic motion moving along similar directions and acting additively, similar to the interpretation for Laurentia between ca. 1110 and 1080 Ma ago (56).…”

Section: Paleomagnetic Analyses and Calculationssupporting

confidence: 74%

“…The secular change of TPW also gives insights into tracing the changing rate of plate tectonics. As TPW manifests with coherent motion of global plates, the intervals of large-scale TPW would reinforce the sensitivity in quantifying plate tectonic rates concurrently with TPW, as already explored by analyzing differences of contemporaneous pole motions [e.g., ( 12 , 54 )]. Most existing estimates of Proterozoic plate velocities are not corrected for possible TPW [e.g., ( 55 )], particularly for the Neoproterozoic when TPW was likely faster and more variable.…”

Section: Discussionmentioning

confidence: 99%

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Secular change of true polar wander over the past billion years

Zhang

Condon

et al. 2022

Sci. Adv.

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The rate of movement of Earth’s solid shell relative to its spin axis, or true polar wander, depends on variations in mantle convection and viscosity. We report paleomagnetic and geochronologic data from South China that constrain the rate of rapid true polar wander (>5° per million years) between 832 million years and 821 million years ago. Analysis of the paleomagnetic database demonstrates secular change of true polar wander related to mantle cooling and thermal structure across supercontinent cycles. True polar wander rates are relatively muted with a partially insulated mantle during supercontinent assembly and accelerate as mantle thermal mixing reestablishes with supercontinent breakup. Decreasing true polar wander rate through the Neoproterozoic was succeeded by overall smaller variations in the Phanerozoic. We propose that Neoproterozoic extensive plate tectonic activities enhanced mantle cooling, giving rise to a reduction in mantle convective forcing, an increase in mantle viscosity, and a decrease in true polar wander rates into the Phanerozoic.

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Section: Paleomagnetic Analyses and Calculationssupporting

confidence: 74%

Section: Discussionmentioning

confidence: 99%

Secular change of true polar wander over the past billion years

Zhang

Condon

et al. 2022

Sci. Adv.

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“…2C). The expanded upper tail corresponds to scenarios where the total pole motion is produced by TPW counteracted by tectonic motion, resembling the case interpreted for South China between 815 and 800 Ma (12) and North China in the late Jurassic (54). Whereas the reduced lower tail corresponds to TPW and tectonic motion moving along similar directions and acting additively, similar to the interpretation for Laurentia between ca.…”

Section: Paleomagnetic Analyses and Calculationssupporting

confidence: 71%

Section: Secular Change Of Tpw Over the Past Billion Yearsmentioning

confidence: 91%

Secular change of true polar wander over the past billion years

Fu¹,

Zhang²,

Condon³

et al. 2022

Preprint

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The rate of movement of Earth’s solid shell relative to its spin axis, or true polar wander, depends on variations in mantle convection and viscosity. We report paleomagnetic and geochronologic data from South China that constrain the rate of rapid true polar wander (>5° Myr-1) from 832–821 million years ago. Analysis of the paleomagnetic database demonstrates secular change of true polar wander related to mantle cooling and thermal structure across supercontinent cycles. True polar wander rates are relatively muted with a partially insulated mantle during supercontinent assembly and accelerate as mantle thermal mixing re-establishes with supercontinent breakup. Decreasing true polar wander rate through the Neoproterozoic was succeeded by smaller variations in the Phanerozoic. We propose that extensive Neoproterozoic plate-tectonic activities enhanced mantle cooling, giving rise to a reduction in mantle convective forcing, an increase in mantle viscosity, and a decrease in true polar wander rates into the Phanerozoic.

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“…Even though two different Jurassic TPW models suggest a similar total rotational amplitude, there is a major dispute about whether there was a “monster shift” TPW in the Late Jurassic. The monster shift in the Late Jurassic may be averaged out within a limited time interval due to the emphasis on paleomagnetic data from sedimentary rocks (Gao et al., 2021), or obscured by the inclusion of numerous problematical poles in the Torsvik et al. (2012)'s model (Kent et al., 2015).…”

Section: Discussionmentioning

confidence: 99%

Jurassic Paleomagnetism of the Lhasa Terrane—Implications for Tethys Evolution and True Polar Wander

Wang

et al. 2022

JGR Solid Earth

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The drift history of the Lhasa terrane from Gondwana to Asia plays a crucial role in understanding the Tethys evolution and true polar wander (TPW). However, few reliable paleomagnetic results from Jurassic strata are currently available for reconstructing its northward journey. We performed a combined paleomagnetic and geochronological study on Bima Formation strata in the Xigaze area. Combined with previous results from the Sangri area, our results reveal a paleolatitude of 8 ± 4°S at ∼180 Ma for the reference point (29.3°N, 90.3°E). Along with other paleomagnetic results from the Triassic to Cretaceous, our new results suggest that the Lhasa terrane motion accelerated from ∼2 cm/yr during ∼220–180 Ma to ∼17 cm/yr during ∼180–170 Ma. Paleolatitude information of the North Qiangtang terrane and Tethyan Himalaya is calculated from paleopoles that meet five criteria, which include (a) structural control, (b) well‐determined rock age, (c) stepwise demagnetizations, (d) a minimum of 25 specimens or 8 sites are contained, and (e) robust field or reversal tests are provided. Both terranes also show significant acceleration during their northward motion, which may be related to oceanic slab subduction. Thus, all Gondwana‐derived microcontinents seem to share a significant acceleration during their northward motion. In addition, recent paleomagnetic results from volcanic rocks dated at ∼155 Ma subdivide the overall northward motion during ∼170–130 Ma into two stages, which include a southward drift during ∼170–155 Ma followed by northward motion during ∼155–130 Ma. These results support the fast Late Jurassic TPW during a ∼10 Myr time span.

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North China block underwent simultaneous true polar wander and tectonic convergence in late Jurassic: New paleomagnetic constraints

Cited by 21 publications

References 44 publications

Secular change of true polar wander over the past billion years

Secular change of true polar wander over the past billion years

Secular change of true polar wander over the past billion years

Jurassic Paleomagnetism of the Lhasa Terrane—Implications for Tethys Evolution and True Polar Wander

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