【摘要】 位于中朝板块北部的燕辽裂陷槽是中元古代板内裂解的产物。中元古代的伸展裂解构造诱发强地震。中元古代长城系(1 800—1 400 Ma)的串岭沟组、高于庄组及蓟县系的雾迷山组(1 200 Ma)中保留有丰富的地震灾变事件记录:各种软沉积物液化变形,如液化砂岩脉;碳酸盐岩中的泥亮晶脉、灰岩墙、液化角砾岩、水塑性变形、各种卷曲构造、环形层、层内粒序断层以及碳酸盐岩成岩初期的脆性变形。这些地震成因的变形构造与同沉积断裂相伴生。依据地震记录,中朝板块北部地区中元古代经历两次板内裂解,即1 800—1 400 Ma之间与1 200 Ma,1 200 Ma的裂解导致燕辽裂陷槽的最终形成。燕辽裂陷槽中元古代的古地理格局与两次板内裂解相联系,古海盆的范围、盆地的边界、岩相带均受同时期断裂—地震控制。燕辽裂陷槽的古地理环境是一个深部物质活跃、断裂火山活动剧烈和地震频繁的构造带。更多还原

【Abstract】 During the Mesoproterozoic,the northern Sino-Korean Plate experienced a period of in- tensive tectonic extension and breakup,thus formed the Yan-Liao Aulacogen.Abundant palaeoearthquake records has been preserved in the Chuanlinggou and Gaoyuzhuang Formations of the Changcheng System (1 800—1 400 Ma)and the Wumishan Formation(1 200 Ma)of the Jixian System of the Mesoprotero- zoic.These earthquake records are characterized by various liquefied deformations of soft sediments such as the liquefied sand-veins,microspar and coarsespar veins in the carbonate rocks,limestone dike,liquefied breccia,hydroplastic deformation,various curly deformations,loop bedding,graded fault in the interval, and the brittle deformation of the early diagenetic stage.These deformations of earthquake origins are al- ways associated with the synsedimentary faults.Based on the earthquake records and volcanic activities, the Sino-Korean Plate experienced at least two episodes of intra-plate breakups. One occurred between 1 800—1 400 Ma,and the other at about 1 200 Ma with the latter one resulting in the formation of the Yan-Liao Aulacogen.The palaeogeographic framework of the Yan-Liao Aulacogen was connected with the two breakups of the Sino-Korean Plate.The boundary of the palaeo-sea basin,the lithofacies zone were both controlled by the contemporary fault-earthquake.The palaeoenviroment of the Yan-Liao Aulacogen was a tectonic zone characterized by deeper material vibrancy,active fault movements,major igneous ac- tivities and frequent earthquakes.更多还原