Keywords:
Devonian
The geological evidences indicate that the terranes in Western China have been accreted by the Cretaceous. However, there is a great discrepancy in the paleomagnetic results of these terranes and Eurasia. The most plausible interpretation is that the collision between India and Eurasian, which started around the boundary of Cretaceous and Tertiary (about 65 Ma), resulted in the crustal shortening among the tectonic units. Based on the paleomagnetic results of the terranes in Western China, the amount of the crustal shortening between each terrane and Eurasia are calculated. The crustal shortenings between Eurasia and Junggar, Tarim, northern Lasha and southern Lasha are 655 km, 1 043 km, 1 265 km and 1 631 km, respectively. The paleomagnetic results of Tarim and Qaidam indicate that Altyn Taugh fault has experienced complicated tectonic activity. The shallow inclination phenomenon which have been observed in many paleomagnetic studies in Asia may be induced by the existence of long-term non-dipole field in the Tertiary.
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Basement
Orogeny
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Rodinia
Supercontinent
Apparent polar wander
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Reconstruction of the facies architecture and geometries of the Cambrian–Ordovician succession in the Central Andes of southern Bolivia and northwestern Argentina reveals a tripartite basin history that closely corresponds to interpretations of regional plate tectonic movements. The analysis of basin deposits enabled tracing and timing of movements of the Arequipa-Antofalla terrane, which initiated, fed, and terminated a basin between the terrane and Gondwana during the early Paleozoic. Tectonic movements started in the Cambrian and led to the formation of an extensional basin. Stretching was more pronounced in southern Bolivia than in northwestern Argentina, resulting in widening of the basin to...
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Apparent polar wander
Rodinia
Geomagnetic pole
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Abstract A late Mesoproterozoic detrital zircon (DZ) age population, which was previously considered diagnostic of a link between the Lhasa terrane and northwest Australia, occurs in other Gondwanan components, thus obscuring the paleogeographic position of the Lhasa terrane in Gondwana. Here we compiled large‐ n ( n ≥ 300) DZ U‐Pb data from the Lhasa terrane and potential source regions in various proposed reconstructions, and attempted to synthesize the Lhasa DZ age spectra through DZ mixing modeling. Our modeling results support the Permo‐Carboniferous Lhasa terrane having received sediment from NW Australia (mainly the Perth basin) rather than India or Africa. This, in combination with stratigraphic and paleontological evidence from the northern margin of eastern Gondwana positions the Paleozoic Lhasa terrane adjacent to the boundary between Australia and India. This study suggests that the DZ mixing modeling method based on large‐ n DZ data can be used effectively for constraining paleogeographic reconstruction of continents.
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