Discordance of Jurassic paleomagnetic data from south China and their tectonic implications

Details Discordance of Jurassic paleomagnetic data from south China and their tectonic implications Discordance of Jurassic paleomagnetic data from south China and their tectonic implications

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993e%26psl.119..259g&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 119, no. 3, p. 259-269

Mathematics

Logic

18

Geomagnetism, Paleomagnetism, Plates (Tectonics), Rotational States, Tectonics, Chemical Analysis, China, Mathematical Models, Thermodynamic Properties

Scientific paper

We have collected oriented cores in Jurassic redbeds from two areas in southern Guangxi Province. Stepwise thermal demagnetization of the samples and subsequent analysis show that the stable magnetization from both areas is a near-primary chemical remanence that passes the fold test. Area 1 lies in a shear zone and is rotated 24 deg +/- 12 deg counterclockwise and insignificantly displaced 4 deg +/- 12 deg northward with respect to Area 2, which lies outside the shear zone, 80 km to the northwest of Area 1. After adjusting for a post-Jurassic tectonic rotation identified in a previous paleomagnetic study, the pole for Area 2 is indistinguishable from an averaged Early to Middle Jurassic reference pole for the Yangtze craton, suggesting that this area was joined to the Yangtze craton by that time, and confirming that considerable clockwise rotation of south China relative to north China remained to be accomplished before the present configuration of the two blocks was attained. In combination with geological observations, these data support a terrane model based on sinistral shear acting parallel to recognized structural trends in this part of southeast China during post-Triassic time.

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