【摘要】 <正> 作者于六十年代初曾概述过中国东部前寒武纪大地构造轮廓和发展样式,探讨了前寒武纪大地构造研究的原则和方法。曾指出地质现象是按各种程序有规律地相互联系着的,而这些综合现象之间又形成了一个有规律的系统。它们的发展可以分阶段,同时也表现为旋迴形式,而地质旋迴的样式在地质历史发展过程中也必须是逐渐演化与发展的。应该把地球的地质历史总趋势理解为前进的、不可逆的和非均变的过程。正是基于此,作更多还原

【Abstract】 The aeromagnetic anomaly fields over the basement of the North China platform may be grouped into four main types: (1) regional anomaly field composed of discrete local anomalies with short axis that are characterized by big magnitudes and appreciable changes in positive and negative values, (2) wide and gentle-sloping bands of positive or negative anomalies of moderate magnitudes, (3) banded, gentlerising or declining anomaly field, and (4) bands of linear magnetic anomalies.An attempt is made to outline the tectonic evolution of the North China platform basement on the basis of the five megastages of the Archaeozoic and early Proterozoic Eons. The occurrence of a small tract of 3.5-b.y.-old continental crust in the QianxiZunhua area in eastern Hebei suggests the earliest tectonic differentiation. The Qianxi megastage that occurred 3.5 to 3.0 b.y. ago is characterized by the development of continental nucleus. The North China embryo-platform took shape during the Fuping megastage at the end of the early Archaeozoic Eon, about 2.5 b.y. ago. Afterwards, in the early Proterozoic, crustal evolution persisted into the rudimentary and proto-geosyncline and -platform stage, and eventually, about 1.7 b.y. ago, the basement of the North China platform was consolidated.Tectonic elements of different generations are sifted out from the integrated tectonic framework of multiple deformation occurring within individual major cycles, and on that basis the authors establish the tectonic sequence, elucidate the deformational history and paleo-structural types of the basement of the Archeozoic and early Proterozoic North China platform, and also discuss the distribution of dykes and dyke swarms and their significance.Facts indicate that the basement of the early Precambrian North China platform grew not only by peripheral accretion but also by cyclic cratonization and subsequent disruption and disintegration as well as repeated activation of mobile belts developing along fundamental deep faults during various megastages. In comparing various tectonic megastages, it can be noted that during the course of tectonic evolution the anorogenic duration became shorter and shorter, while the tectonic activity was gradually intensified and the differentiation became pronounced.更多还原