一、前言宣化地区属于冀热山地的地质构造单元。在震旦纪前,冀热山地即形成古陆。震旦纪时大部活化转为“次生地槽”,经过一度露出海面和一定长期的稳定后,在古生代末期又开始了局部活动;中生代以来其活动更加广泛和剧烈,是中国地台上一个显著的“活化区”。 I. Foreword Xuanhua belongs to the geothermal structural unit of Jizhe Mountain. Before the Sinian, Ji heat mountain that formed the ancient land. During the Sinian Period, most of the activation changed to “secondary geosynclinal”. After once showing the sea surface and some long-term stability, it began partial activities in the late Paleozoic. Since the Mesozoic, its activities have been more extensive and intense. Significant “activation zone.”