大陆岩石圈对扩张机制的响应--辽蒙地质走廊中-新生代火山活动的时空分布

Response of the continental lithosphere to the spreading mechanism: Space-time distribution of the Meso-Cenozoic volcanic activities in the Liao-Meng geological corridor, China

选择以辽西为中心,近东西向延伸800km的辽蒙地质走廊为研究区,通过年代学研究,确认130Ma以来的中、新生代火山活动对称分布的时空格局具有"中间老、两侧新"的特点,而且随着时间的推移,软流圈来源的岩浆向东西两侧侧向流动,岩浆来源不断加深。在此基础上提出"软流圈底辟体上涌和水平侧向流动"的模式。

The Liao-Meng geological corridor, which centers on western Liaoning and extends 800 km in a nearly E-W direction, was selected as the study area. Through a chronological study, the authors confirm that the symmetrical temporal-spatial distribution pattern of Meso-Cenozoic volcanic activities since 130 Ma has the features of being ＂older （Mesozoic） in the center and younger （Cenozoic） at both sides＂, and with time the magma derived from the asthenosphere flowed laterally toward the east and west and the magma source deepened continuously. On that basis, the authors propose a model of＂upwelling and lateral flow of the asthenospheric diapir＂.