Paleomagnetic constraints on the late Cretaceous and Cenozoic tectonics of southeastern Asia

Details Paleomagnetic constraints on the late Cretaceous and Cenozoic tectonics of southeastern Asia Paleomagnetic constraints on the late Cretaceous and Cenozoic tectonics of southeastern Asia

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983e%26psl..63..123a&link_type=abstract

Earth and Planetary Science Letters, Volume 63, Issue 1, p. 123-136.

Mathematics

Logic

40

Scientific paper

Many features of the Cenozoic tectonic history of central and southeastern Asia can be understood as direct consequences of the thrust and penetration of India into Asia. Recent indentation experiments with plasticine (Tapponnier et al. [7]) have extended this idea and have led to the prediction of a pattern of large rotations and displacements of continental blocks that can be tested by paleomagnetism. The available Cretaceous and Cenozoic paleomagnetic data from this part of the world have been reviewed and a new APWP for Eurasia has been constructed for reference. The negligible rotation of South China and large clockwise rotation of Indochina are consistent with the model, i.e., with an history of large-scale left-lateral strike-slip motion along the Altyn Tagh and Red River faults. Data from Malaya and Borneo can be reconciled with the model, although in a less straightforward fashion. The large counter clockwise rotation of South Tibet implies that it rotated in sympathy with India during the collision and suggests that future indentation experiments should include this feature. Finally a middle Cretaceous reconstruction of the south margin of Asia is proposed. One interesting result is the restored continuity of geological features in Tibet and Indochina, with active subduction of oceanic (Indian plate) crust taking place to the south at subtropical latitudes.

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