燕山地区喜马拉雅期地壳运动划分及表现特征

DIVISION OF CRUSTAL MOVEMENT OF HIMALAYAN PERIOD IN YANSHAN AREA AND ITS EXPRESSED FEATURES

在全面总结燕山地区新生代沉积相和厚度分析、地貌类型及特征、新生代岩浆活动、活动构造类型及特征、延（庆）涿（鹿）地堑盆地及其构造演化、地震地质分析以及大量的同位素年龄测试结果基础上，结合前人对邻区地壳运动划分的意见，系统地将燕山地区喜马拉雅期地壳运动划分为两期、三幕和三亚幕，为我国东部地区建立了一个比较完整的新生代地壳运动年表。

uring 1985 to 1990, the authors widely made field investigation in the Yanshan area (E114°-122°, N39°-42°30')which is covered about 260 000 km2 area. After this work, the authors put forward the chronological table on dividing the crustal movement of Himalayan period in that area by synthetically analyzing some geological characteristics, such as sedimentary factes and thickness of the Cenozoic strata, types and features of land form, intensity of magma activity, structural evolution in Yanqing and Zhuolu grabentype basins and a large amount of isotopic dating values. In this table, the crustal movement of Himalayan period in the area is divided into two periods, three episodes and three subepisodes: the early Himalayan period end E3) and the late Himalayan period (end E3-Q); the first episode(middle ),the second episode (end E3) and the third episode(Q); the firstsubepisode (end N1), the second subepisode (Q2) and the third subepisode (Q4). In the beginning of each period episode and subepisode obviously shows the feature of magma intrusion and exhale activities to be at high tide.