New Paleomagnetic Insights Into the Neoproterozoic Connection Between South China and India and Their Position in Rodinia

Chang, Linxi; Zhang, Shihong; Li, Haiyan; Xian, Hanbiao; Wu, Huaichun; Yang, Tianshui

doi:10.1029/2022gl098348

Cited by 17 publications

(4 citation statements)

References 74 publications

(118 reference statements)

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“…South China was either disconnected entirely from Rodinia ( 12 , 32 , 33 ) or located at its periphery during the Tonian (1000 to 720 Ma ago) ( 34 ). The direction and speed of the tectonic motions of South China between 832 and 821 Ma ago are currently unknown, because of a paucity of exactly coeval data from other continents for comparison of relative tectonic motion.…”

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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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: 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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“…Consistent with this idea, Chang et al. (2022) mapped the Banxi Group as unconformably overlain by Devonian strata, thereby supporting an Ordovician‐Silurian deformation event. 90 km to the south‐east of Yangjiaping, an angular unconformity occurs at the top of the Middle Ordovician Guniutan Formation (Schmitz et al., 2010), however, near Yangjiaping, the formations above and below the Guniutan Formation have similar bedding orientations.…”

Section: Interpretation and Discussionmentioning

confidence: 87%

Middle Neoproterozoic (Tonian) Polar Wander of South China: Paleomagnetism and ID‐TIMS U‐Pb Geochronology of the Laoshanya Formation

Tonti‐Filippini,

Robert,

Muller

et al. 2024

JGR Solid Earth

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Paleomagnetic records of middle Neoproterozoic (820 to 780 Ma) rocks display high amplitude directional variations that lead to large discrepancies in paleogeographic reconstructions. Hypotheses to explain these data include rapid true polar wander (TPW), a geomagnetic field geometry that deviates from a predominantly axial dipole field, a hyper‐reversing field (>10 reversals/Ma), and/or undiagnosed remagnetization. To test these hypotheses, we collected 1,057 oriented cores over a 85 m stratigraphic succession in the Laoshanya Formation (Yangjiaping, Hunan, China). High precision U‐Pb dating of two intercalated tuff layers constrain the age of the sediments between 809 and 804 Ma. Thermal demagnetization isolates three magnetization components residing in hematite which are not time‐progressive but conflated throughout the section. All samples possess a north and downward directed component in geographic coordinates at temperatures up to 660°C that is ascribed to a Cretaceous overprint. Two components isolated above 660°C reveal distinct directional clusters: one is interpreted as a depositional remanence, while the other appears to be the result of a mid‐Paleozoic (460 to 420 Ma) remagnetization, which is likely widespread throughout South China. The high‐temperature directions are subtly dependent on lithology; microscopic and rock magnetic analyses identify multiple generations of hematite that vary in concentration and distinguish the magnetization components. A comparison with other middle Neoproterozoic paleomagnetic studies in the region indicates that the sudden changes in paleomagnetic directions, used elsewhere to support the rapid TPW hypothesis (ca. 805 Ma), are better explained by mixtures of primary and remagnetized components, and/or vertical axis rotations.

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“…However, a contrasting model placed South China together with India on the periphery of the Rodinia until the final amalgamation of the Gondwana (Cawood et al, 2018). This model was further supported by recent paleomagnetic studies (Park et al, 2021;Chang et al, 2022). Despite these uncertainties, there is a growing consensus that South China kept a close linkage with India between the Ediacaran-early Cambrian (Yang et al, 2020).…”

Section: Cryogenian and Ediacaran Paleogeographic Evolution Of The Qi...mentioning

confidence: 96%

Cryogenian and Ediacaran integrative stratigraphy, biotas, and paleogeographical evolution of the Qinghai-Tibetan Plateau and its surrounding areas

Sun,

Khan,

Yang

et al. 2024

Sci. China Earth Sci.

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New Paleomagnetic Insights Into the Neoproterozoic Connection Between South China and India and Their Position in Rodinia

Abstract: The Neoproterozoic connection between the south China craton (SCC) and India has long been advocated for the similarities of their geological records (e.g.,

Cited by 17 publications

References 74 publications

Secular change of true polar wander over the past billion years

Secular change of true polar wander over the past billion years

Middle Neoproterozoic (Tonian) Polar Wander of South China: Paleomagnetism and ID‐TIMS U‐Pb Geochronology of the Laoshanya Formation

Cryogenian and Ediacaran integrative stratigraphy, biotas, and paleogeographical evolution of the Qinghai-Tibetan Plateau and its surrounding areas

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