A definite low Pn velocity region to the south of Tarim basin is possibly related to strong magma and tectonic activity.
塔里木南缘中部存在一显著的低速区，可能与岩浆活动和构造活动较强有关。
2
The origination of the magma is related with the dehydration of the subducting plate of the Palezoic Tethy Sea and the early tension of the form of the Lancangjiang belt red layer basin.