古地震记录与岩相古地理  

Ancient Earthquake Records and Litho-Paleogeography

作　　者：宋天锐[1] 刘燕学[1] 

机构地区：[1]中国地质科学院地质研究所,北京100037

出　　处：《沉积学报》2009年第5期872-879,共8页Acta Sedimentologica Sinica

基　　金：国家自然科学基金项目(批准号:49772121;40672082)资助

摘　　要：本研究概括了古地震记录三方面的主要特征,即宏观构造、微观构造和地球化学异常。提出了不同沉积岩相古地理环境下古地震记录的差异性,指出了地震泄水充填脉构造在潟湖、潮坪、浅海碳酸盐岩和缓坡碳酸盐岩等相带中形成的特点,以及臼齿构造(molar-tooth)出现在缓坡碳酸盐岩相带的原因。根据在地震事件层内发现火山晶屑和火山玻璃假象的事实,指出采取同位素测年样品的必要性。Three main characteristics of ancient earthquakes are demonstrated in this paper. They are macro-structures, micro-structures, and geo-chemical abnormal. There are differences of earthquake records in various litho-geographic environments. It is recognized that the formation factors caused by water escape fillings so called molar tooth structures either in clastic rocks or in carbonate rocks, such as sand liquefaction and sand bed slump structures so common in lacustrine, lagoon and tidal flats but molar tooth structures widely distributed in carbonate rocks related with marine ramp environment due to tempsite beds always containing more water. Besides, volcanic crystals, tufts, or pseudomorphic volcanic glasses could be company with earthquake records beds need pay attention to collection of samples for geo-age determination.

关 键 词：古地震记录 岩相古地理 火山活动 

分 类 号：P512.2[天文地球—地质学]