摘要
本文对东亚滨太平洋地区晚古生代、印支期与燕山期古构造背景进行了概括,在此基础上,进而将本区喜马拉雅期的地壳运动,划分出早、晚两个构造期与两个主要构造幕;对本区自洋至陆划分出5条喜马拉雅期巨型构造-建造带,即西北太平洋海沟-岛弧带、西北太平洋边缘海盆带、东海-南海北部陆架断陷带、东亚陆缘裂谷带及陆内裂谷带;还对早、晚喜马拉雅期构造演化进行阐述。最后对本区喜马拉雅期区域应力场状态及演变特点进行探讨,认为其形成机制与大陆-大洋、表部-深部的相互作用密切相关。
1. Cenozoic Formation and Deformation ZonationFrom the present trench belt of the northwest Pacific to the west, there are distributed five gigantic Himalayan formation and deformation zones:(1) Northwest Pacific trench-island arc zone.(2) Marginal sea basin zone in the northwest Pacific.(3) Continental shelf subsidence zone from the East China Sea to the north part of the South China Sea.(4) Continental-margin rift zone of East Asia.(5) Intracontinental rift zone of East Asia.2. Cenozoic Tectonic EvolutionFrom an analysis of tectonic evolution and the change of tectonic features, the Himalayan tectonic cycle in the north-west peri-Pacific tectonic belt may be divided into the early Himalayan stage (E K_2~2-E) and late HimaLayan stage (N-Q). By the end of the early Himalayan stage and between the Late Tertiary and Early Quaternary of the late Himalayan stage, two tectonic or orogenic phases took place.In the early Himalayan stage, there occurred the northwest peri-Pacific trough zone and continental shelf subsidence zone from the East China Sea to the north part of the South China Sea. Some continental-margin and intracontinental rift systems may involve the uplift-erosion stage (K_2-E_1) and faulting-subsidence stage (E_2-E_3 or E_2-N_1). In the late period of the early Himalayan stage, the east trough zone was folded, and the South China Sea underwent seafloor spreading.In the late Himalayan stage (N_1-Q or N_2-Q), the continental margin and intracontinental rift system and the continental shelf zone experienced downwarping. A unified trench-arc system and epicontinental basin zone came into being in the Late Miocene and Late Pliocene.
出处
《地质学报》
EI
CAS
CSCD
北大核心
1990年第1期1-12,共12页
Acta Geologica Sinica
