摘要
本文从印度大陆与亚洲大陆新生代碰撞前缘的多阶段构造变形与隆升过程，对比了 我国南海北部大陆边缘盆地，东部渤海湾盆地的构造－沉积－岩浆事件，它们在时间上具准同 时性，表现在两大陆碰撞构造变形和抬升的高峰时期正好与盆地伸展、拉张，快速构造沉降时 期相对应；当构造转入相对稳定（松弛）阶段，表现为高原剥蚀夷平，岩浆活动频繁，盆地构造 沉降速率减缓阶段。青藏高原多阶段构造－岩浆事件还与我国季风形成和发展以及全球新生 代３次变冷事件具某种对应联系，认为深部地幔脉动上涌的热力效应可能是诱发高原季风，行 星西风增强，高纬度降温的驱动力之一。它和高原地形增高引发大气热机效率增大起着互补 作用，使青藏高原成为诱发我国大气环流变化的启动区。
Analyses of deformation, sedimentation and magmatism in the continental marginal basins of the northern South China Sea and the Bohai basin in North China in Cenozoic indicate a penecomtemporaneous process with multi-stage deformation and raising of the Tibetan plateau since the collision of India with Asia. Intense deformation and uplifting of Tibet concurred with extension and rapid tectonic subsidence in the study basins. However, the relative tectonic silence and denudation in Tibet corresponds frequently to magmatic activity and slower subsidence in the basins. Furthermore, the multi-stage tectono-magmatic events of Tibet are also nearly synchronous with occurrence of the eastern Asian monsoon and of the three global cold events. These chronological coincidences suggest that thermal effect resulted from the collision-induced mantle upwelling and flow in the vertical and horizontal directions in Tibet might be one of the triggers for setting up the plateau monsoon, strengthening the planetary westerly winds and the cooling in high latitude of the Earth, as well as initiating the Asian monsoon.
出处
《第四纪研究》
CAS
CSCD
北大核心
2001年第4期303-312,共10页
Quaternary Sciences
基金
国家自然科学基金(批准号:49732100)
国家重点基础研究发展规划项目(G1998040801)资助
