摘要
燕山地区是东亚中生代地质构造发育的典型地区,是燕山运动的命名地。本文通过重新认识龙门组的沉积性质,并结合其它有关研究和资料,提出了大陆内部陆相环境地区造山运动时期的鉴定标志。依此确立和划分了本区印支运动、燕山运动及其构造期、幕。分别编制了印支期(T_1—J_1~1)、早燕山期(J_1~2—J_2~2)、中燕山期(J_2~3—J_3)和晚燕山期(K_1—K_2~1)古构造图。论述了中生代各阶段的构造演化。强调指出早燕山构造幕的重要意义。
The Yanshan area is a typical area of the Mesozoic geological structures of East Asia as well as where the Yanshanian movement was first proposed According to a study of the Early-Middle Jurássic structures and sedimentary facies in the western part of Beijing, the author has reconsidered the nature of the Longomen Formation and its correlation with its corresponding strata, and then, in combination with other relevant studies and data, has put forward the criteria for the recognition of an orogeny in a continental environment within a continent. On that basis, the Indosinian movement and Yanshanian movement have. been established and their orogenic stages and phases distinguished. The paleotectonic maps of Indosinian age (T_1~1—J_1~1), early Yanshanian age (J_1~2—J_2~2), middle Yanshanian age (J_2~2—J_3) and late Yanshanian age (K_1—K_2~1)have been compiled respectively. the tectonic evolution in various stages of the Mesozoic is biscussed. It is pointed out explicitly that the Indosinian movement was intense in the northern Hedei and westen Liaoning areas and that the large-scale overthrusting of the hanging wall of the Pingquan-Kubeikou fault resulted in the complete denudation of the covers and extensive exposure of the crystalline ba(?)ement, the early Yanshanian orogenic phase is the main phase of the Yanshanian movement. By the end of the Jiulongshanian period, the main part of the cover folds was completed. In the middle Yanshanian period, the typical tectonic stage of the peri-Pacific belt of East Asia started in the area, when volcanic eruption took place throughout the area and over thrusts and nappes were widely developed. In the early part of the late Yanshanian, the magmatic activity reached its culmination. Afterwards the regional tectonic stress field began to change and there appeared extensional structures.
出处
《地质论评》
CAS
CSCD
北大核心
1990年第1期1-13,共13页
Geological Review
