| 燕辽裂陷槽中元古代古地震与古地理 |
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| 引用本文： | 乔秀夫,高林志.燕辽裂陷槽中元古代古地震与古地理[J].古地理学报,2007,9(4):337-352. |
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| 作者姓名： | 乔秀夫 高林志 |
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| 作者单位： | 中国地质科学院地质研究所 北京100037 |
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| 基金项目： | 中国地质调查局区域地质调查项目 |
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| 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（1800-1400 Ma）的串岭沟组、高于庄组及蓟县系的雾迷山组（1200 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1800-1400 Ma之间与1200 Ma，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。
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| 关 键 词： | 燕辽裂陷槽 中元古代 古地震 软沉积物液化变形 板内裂解 古地理 |
| 文章编号： | 1671-1505（2007）04-0337-16 |
| 修稿时间： | 2006-11-062006-12-14 |
Mesoproterozoic palaeoearthquake and palaeogeography in Yan-Liao Aulacogen |
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| Qiao Xiufu,Gao Linzhi.Mesoproterozoic palaeoearthquake and palaeogeography in Yan-Liao Aulacogen[J].Journal of Palaeogeography,2007,9(4):337-352. |
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| Authors: | Qiao Xiufu Gao Linzhi |
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| Institution: | Institute of Geology, Chinese Academy of Geological Sciences, Beijing100037 |
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| Abstract: | During the Mesoproterozoic, the northern Sino Korean Plate experienced a period of intensive 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 （1800—1400 Ma） and the Wumishan Formation （ 1200 Ma） of the Jixian System of the Mesoproterozoic. 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 always 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 1800—1400 Ma, and the other at about 1200 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 activities and frequent earthquakes. |
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| Keywords: | Yan-Liao Aulacogen Mesoproterozoic palaeoearthquake liquefied deformation of soft sediments intraplate breakup palaeogeography |
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