<p>Vertical-axis rotations of blocks in/around the Tibetan Plateau can be attributed to the India–Asia collision. Study of the
vertical-axis rotations of these blocks will increase our understanding of the mechanisms and kinematics of continent–continent
collisions. We report here a new palaeomagnetic study of rotations using data from four localities (five magnetostratigraphy
sections) in the Jiuquan Basin. Our study indicates that the mean declinations of each section are different from each other,
similar to what has been observed in the other localities in the NE Tibetan Plateau. However, using the mean directions of
every 100 m of section, we observe that the four localities have similar sequential patterns of rotations during the last
13 Ma: significant continuous counterclockwise before <em>c.</em> 8.0 Ma, insignificant rotations between 8.0–4.0 Ma, and slight clockwise rotation after 4.0 Ma. This indicates that, rather
than being a record of spatially varying declinations, it is a temporal variation in the occurrence of regional rotations.
Combined with other geological evidence, the rotation patterns may suggest two major tectonic activity phases of the northeastern
Tibetan Plateau during the last 13 Ma: an eastward extrusion and strike-slip dominant phase before 8.0 Ma, a significant shortening
and a rapid uplift dominant phase after 8.0 Ma.
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