晚古生代—早中生代扬子板块西缘的构造-岩浆活动

The Late Paleozoic—Early Mesozoic Tectono-Magmatism in the Western Margin of the Yangtze Plate

根据晚古生代—早中生代扬子板块西缘基性岩浆活动的时空分布特点,尤其是峨眉山玄武岩的时空分布特点和古地磁研究资料,结合板块构造及地幔柱学说,笔者认为形成于早二叠世的盐源—丽江陆缘海裂谷、晚二叠世的攀西裂谷以及二叠纪末至早中三叠世的甘孜—理塘洋均为峨眉地幔热柱与扬子板块在这一时期顺时针旋转的共同作用所致,同时峨眉地幔热柱的活动构成了完整的威尔逊旋回。

Acording to the features of the basic magmatism of the western margin of the Yangtze plate in the late Paleozoic—early Mesozonic, especially that of Emeishan basalts and the data of palaeo terrestrial magnetism, combine with the theory of plate tectonics and mantle plum, it is conclude that the Yanyuan—Lijiang shelf sea rift (P_1) , Panxi rift (P_2) and Ganze—Litang sea (P_2—T_2) were the results of the action of Emei mantle plum and the clockwise rotation in this period. Moreover, Emeimantle plum completed a whole Wilson cycle.