Palaeomagnetic evidence for southward displacement of the Chuan Dian fragment of the Yangtze Block

Details Palaeomagnetic evidence for southward displacement of the Chuan Dian fragment of the Yangtze Block Palaeomagnetic evidence for southward displacement of the Chuan Dian fragment of the Yangtze Block

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004geoji.158..297t&link_type=abstract

Geophysical Journal International, Volume 158, Issue 1, pp. 297-309.

Astronomy and Astrophysics

Astronomy

5

Chuan Dian Fragment, Deformation, Displacement, Palaeomagnetism, Tectonics, Yangtze Block

Scientific paper

SUMMARY Cretaceous red sandstones of the Feitianshan Formation and the Xiaoba Formation were sampled at 33 sites from the Dadeli and Mishi synclines of Xichang (27.9°N, 102.3°E). The study area is a part of the Chuan Dian fragment bounded by the Xianshuihe-Xiaojiang and the Red River fault systems, which in turn constitute the southwestern part of the Yangtze Block. Almost all the samples give a characteristic palaeomagnetic direction with unblocking temperatures up to 680°C. The primary nature of magnetization is ascertained by a positive fold test with a 99 per cent confidence level for the Dadeli Syncline. The tilt corrected overall mean direction of the 33 sites is D= 3.7°, I= 41.5°(α95= 3.4°), with a corresponding palaeopole at 85.2°N, 241.7°E(A95= 3.5°). This pole occupies the near-sided position with respect to the estimate of the Cretaceous pole of the Sichuan Basin, indicating that the Xichang area experienced a significant southward displacement. Combined with earlier reported palaeomagnetic data from the Chuan Dian fragment, a significant southward displacement of 6.7°+/- 3.5° in latitude is estimated for the whole fragment with respect to the Sichuan Basin since the Late Cretaceous. Extrusion dynamics in the Asian continent due to its collision with India brought about the southward displacement of the Chuan Dian fragment. Declination data indicate that the southern part of the Chuan Dian fragment was subjected to clockwise sense rotation of up to 45°. This significantly large tectonic rotation probably occurred during extrusion of this fragment from the north.

Affiliated with

Also associated with

No associations

Rating

Palaeomagnetic evidence for southward displacement of the Chuan Dian fragment of the Yangtze Block does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Palaeomagnetic evidence for southward displacement of the Chuan Dian fragment of the Yangtze Block, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Palaeomagnetic evidence for southward displacement of the Chuan Dian fragment of the Yangtze Block will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1009806