Paleomagnetic study of Cretaceous rocks from the Yangtze block, central Yunnan, China: implications for the India-Asia collision

Details Paleomagnetic study of Cretaceous rocks from the Yangtze block, central Yunnan, China: implications for the India-Asia collision Paleomagnetic study of Cretaceous rocks from the Yangtze block, central Yunnan, China: implications for the India-Asia collision

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992e%26psl.113...77f&link_type=abstract

Earth and Planetary Science Letters, Volume 113, Issue 1-2, p. 77-91.

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More than 200 samples for this study were collected at 30 sites from the Cretaceous Matoushan and Puchanghe Formations around the city of Chuxiong (25°N,101.5°E). Twenty-four sites have characteristic directions with a high temperature component above 350°C. Paleomagnetic directions from 21 sites of the Cretaceous formations reveal clockwise deflection in declination (D = 44.6°, I = 41.3°, and α95 = 10.7°). The reliability of the direction is ascertained through a positive fold test, and the presence of normal and reversed polarities. Comparison with paleomagnetic data from other areas indicates that the Chuxiong area was rotated clockwise through 26° +/- 17° with respect to the eastern part of the Yangtze block, whereas it was subjected to more than 44° of clockwise rotation with respect to the neighboring blocks of Lhasa (56° +/- 21°) and western Sichuan (44° +/- 16°) since Cretaceous time. The clockwise rotation of Chuxiong is a reflection of rotational motion of the large region including the southeastern Qiangtang Terrane and the Jinsha suture-Red River fault. Paleomagnetic data and tectonic features suggest that the rotation occurred prior to the folding in the central Yunnan province, probably during the Paleogene. This large rotation is a spectacular example of the deformation in the southeastern part of the Asian continent due to the collision of India.

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