Paleomagnetic data from the Middle-Late Triassic rocks of northern Qiangtang Block, Tibet plateau, China

• 1、Department of Geology, Northwest University

Abstract：The Qiangtang Block, main blocks consist of the Tibet Plateau, is located at hinterland of the Tibet Plateau, China. Kinematic characteristics of this block closely related to the geological events such as the transformation between the Paleo-Tethys and Neo-Tethys. Paleomagnetism is an effective approach to past tracks of plates and terranes. To better constrain the evolution of the Tethyan Ocean, a combined paleomagnetic and rock magnetic study was conducted on the Middle-Late Triassic strata of the northern Qiangtang block. The rock magnetic results indicated that the dominant magnetic carrier in Tuzhonghu volcanic samples are magnetite, and Juhuashan limestone samples contain hematite. Orthogonal vector diagrams of the Middle-Late Triassic specimens exhibited two components of magnetic remanence. Except for the low-temperature component, we obtained the middle-high component which might be the re-magnetization form the Late Cretaceous Period based on the comparison with previously published paleomagnetic data.

Keywords： Tibetan Plateau northern Qiangtang Block Middle-Late Triassic paleomagnetism re-magnetization