青藏高原东南缘东南向挤出最北边界的古地磁约束

Key Points

• This research aims to constrain the latitudinal displacement history of the southeastern Tibetan Plateau during the Cenozoic era through paleomagnetic analysis.
• Conducted systematic paleomagnetic studies along two profiles in the Deqen region of the southeastern Tibetan Plateau.
• Collected paleomagnetic samples from the Eocene Dongwang Formation in the study area.
• Performed thermal demagnetization and used magnetostratigraphic tests to analyze the magnetic properties and stratification.
• Average corrected magnetic directions were found at Ds=314.2°, Is=+42.8° and Ds=19.7°, Is=+49.1° across the two profiles.
• Revealed that the Deqen region did not undergo significant latitudinal displacement relative to the Eurasian continent during the Eocene.
• Demonstrated distinct north-south differential movements in the southeastern Tibetan Plateau since the late Eocene, with significant southeastern escape in the south and limited northward movement in the north.