Palaeomagnetism and geochronology of mid-Neoproterozoic Yanbian dykes, South China: implications for ac.820–800 Ma true polar wander event and the reconstruction of Rodinia

2015 ◽  
Vol 424 (1) ◽  
pp. 191-211 ◽  
Author(s):  
Jiawen Niu ◽  
Zheng-Xiang Li ◽  
Weiguang Zhu
Keyword(s):  
South China ◽  
Polar Wander ◽  
True Polar Wander

Inverted South China: A novel configuration for Rodinia and its breakup

Geology ◽  
2020 ◽  
Author(s):  
Xianqing Jing ◽  
David A.D. Evans ◽  
Zhenyu Yang ◽  
Yabo Tong ◽  
Yingchao Xu ◽  
...  
Keyword(s):  
South China ◽  
Plate Tectonics ◽  
The South ◽  
Polar Wander ◽  
True Polar Wander ◽  
Apparent Polar Wander Path ◽  
Lower Member ◽  
New Interpretation ◽  
Global Data

Disentangling records of Rodinia fragmentation and true polar wander remains a challenge for understanding late Tonian plate tectonics. The ca. 760 Ma lower member of the Liántuó Formation, South China, yields a primary paleomagnetic remanence that passes both the fold and reversal tests. This new result and recently reported ca. 800 Ma data from elsewhere in South China suggest a new interpretation of its apparent polar wander path, whereby pre–770 Ma poles have inverted absolute polarity relative to traditional interpretations. Based on this inversion, and an interpretation of several oscillations of true polar wander documented by global data during 810–760 Ma, we propose a novel reconstruction for Rodinia and its breakup. Our reconstruction places the South China, India, and Kalahari cratons to the southwest of Laurentia, with connections that might have been established as early as ca. 1000 Ma. Our model also suggests that initial rifting of Rodinia occurred at ca. 800 Ma via fast northward motion of the India craton and South China.

The Neoproterozoic geomagnetic field: new insights from a high-resolution paleomagnetic study in South China

2021 ◽  
Author(s):  
Justin Tonti-Filippini ◽  
Boris Robert ◽  
Élodie Muller ◽  
Michael Wack ◽  
Xixi Zhao ◽  
...  
Keyword(s):  
South China ◽  
Geomagnetic Field ◽  
Alternative Explanation ◽  
Rotation Axis ◽  
Sedimentary Rocks ◽  
Polar Wander ◽  
True Polar Wander ◽  
Paleomagnetic Study ◽  
Stratigraphic Height ◽  
Independent Motion

<p>The paleomagnetic record during the middle Neoproterozoic (~825-780 Ma) displays rapid apparent polar wander variations leading to large discrepancies in paleogeographic reconstructions. Some authors propose that these data may represent true polar wander events, which correspond to independent motion of the mantle and lithosphere with respect to Earth’s rotation axis. An alternative explanation might be a perturbation of the geomagnetic field, such as a deviation from a predominantly dipole field or a hyper-reversing field. To test these hypotheses, we sampled 1200 oriented cores over a stratigraphic height of 100 metres in sedimentary rocks of the 820-810 Ma Laoshanya Formation in South China. We will present preliminary paleomagnetic and rock magnetic analyses together with results of petrologic and geochemical experiments to better understand the origin of the paleomagnetic signal.</p>

scholarly journals Style of density stratification in the mantle and true polar wander induced by ice loading

2002 ◽  
Vol 107 (B10) ◽  
pp. ETG 16-1-ETG 16-17 ◽  
Author(s):  
R. Sabadini ◽  
A. M. Marotta ◽  
R. De Franco ◽  
L. L. A. Vermeersen
Keyword(s):  
Density Stratification ◽  
Polar Wander ◽  
True Polar Wander

Late Cretaceous True Polar Wander: Not So Fast

Science ◽  
2000 ◽  
Vol 288 (5475) ◽  
pp. 2283a-2283 ◽  
Author(s):  
R. D. Cottrell
Keyword(s):  
Late Cretaceous ◽  
Polar Wander ◽  
True Polar Wander
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