Age of blastomilonites of the Yenisei regional shear zone as evidence of the Vendian accretionary-collision events at the western margin of the Siberian Craton
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Continental Margin
Rodinia
Collision zone
Accretionary wedge
Accretionary wedge
Collision zone
Forearc
Trough (economics)
Convergent boundary
Volcanic arc
North American Plate
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Abstract A paleogeographic affinity of the south China craton (SCC) with India in the Neoproterozoic has long been advocated based on lines of geological evidence. However, the lack of coeval paleomagnetic data renders the putative connection ambiguous. Here we report new paleomagnetic results obtained from seven ca. 770 Ma mafic sills in SCC that provide new critical constraints on the issue. The data quality is assured by a positive regional tilt test, a reversal test, and by adequately averaging‐out paleosecular variation. Our data, together with coeval poles from the global paleomagnetic database, support a reconstruction in which the SCC was connected with India at ca. 770 Ma via linkages with smaller continental blocks. The SCC‐India landmass was located at high‐to‐mid latitudes and far from Laurentia and Australia, which were located at low latitudes at ca. 770 Ma.
Rodinia
Laurentia
Low latitude
Sill
Snowball Earth
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Rodinia
Supercontinent
Apparent polar wander
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Rodinia
Supercontinent
Apparent polar wander
Polar wander
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Rodinia
Geochronology
Supercontinent
Apparent polar wander
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Taiwan accretionary prism lies in the conjunction area of the Eurasian Plate,the Philippine Sea Plate and the South China Sea,and is characterized by the young age of the arc-continent collision.The structural geometry,kinematics and density structure of the Taiwan accretionary prism were studied based on the interpretation of a multi-channel seismic profile obtained during a 973 survey.Geological evidence showed that the Taiwan accretionary prism consists of three distinct structural domains: the collision prism caused by the arc-continent collision,the subduction prism caused by the inner-ocean subduction,and the tectonic wedge between the Luzon arc and the prism.In the studied area,the three domains are the Gaoping Slope,the Hengchun Ridge and the west part of Luzon Through,respectively.Since the middle Miocene,the South China Sea had subducted beneath the Philippine Sea Plate along the Manila Trench,and the subduction prism came into being.The Philippine Sea Plate also moved northwestward and collided obliquely with the Asian continent since 6.5Ma B.P..The arc-continent collision made the collision prism west of the subduction prism,together forming the Taiwan accretionary prism.With the continuous process of the arc-continent collision,a tectonic wedging took place along the rear of Taiwan accretionary prism and caused the uplift and deformation of the strata in the west part of the North Luzon Through.Compared with the onshore geology,the offshore Taiwan accectionary prism has the similar and relevant structure characteristics.They have the same tectonic mechanism but different deformation history,i.e.the collision began in the north of Taiwan,and then propagated southward.The onshore Taiwan has much longer deformation history.
Accretionary wedge
Prism
Collision zone
Island arc
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Supercontinent
Rodinia
Apparent polar wander
Red beds
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