New Late Jurassic palaeomagnetic data from the northern Sichuan basin: implications for the deformation of the Yangtze craton

Details New Late Jurassic palaeomagnetic data from the northern Sichuan basin: implications for the deformation of the Yangtze craton New Late Jurassic palaeomagnetic data from the northern Sichuan basin: implications for the deformation of the Yangtze craton

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999geoji.139..795y&link_type=abstract

Geophysical Journal International, Volume 139, Issue 3, pp. 795-805.

Astronomy and Astrophysics

Astronomy

5

Continental Deformation, Jurassic, Palaeomagnetism, Tectonics

Scientific paper

Upper Jurassic red sandstones and red siltstones were collected from 67 layers at 12 localities in the Penglaizhen formation. This formation is in the north of Bazhong county (31.8 degN, 106.7 degE) in the Sichuan basin, which is located in the northern part of the Yangtze craton. Thermal demagnetization isolated a high-temperature magnetic component with a maximum unblocking temperature of about 690 degC from 45 layers. The primary nature of the magnetization acquisition is ascertained through the presence of magnetostratigraphic sequences with normal and reversed polarities, as well as positive fold and reversal tests at the 95 per cent confidence level. The tilt-corrected mean direction of 36 layers is D=20.0 deg, I=28.8 deg with α95=5.8 deg. A Late Jurassic palaeomagentic pole at 64.7 degN, 236.0 degE with A95=7.0 deg is calculated from the palaeomagnetic directions of 11 localities. This pole position agrees with the two other Late Jurassic poles from the northern part of the Yangtze craton. A characteristic Late Jurassic pole is calculated from the three poles (68.6 degN, 236.0 degE with A95=8.0 deg) for the northern part of the Yangtze craton. This pole position is significantly different from that for the southern part of the Yangtze craton. This suggests that the southern part of the Yangtze craton was subjected to southward extrusion by 1700+/-1000 km with respect to the northern part. Intracraton deformation occurred within the Yangtze craton.

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