【摘要】 通过岩心观察在蒙古国南贝尔凹陷发现大量泥质软沉积变形构造,个体构造形态可分为眼状、螯状、拖曳状和波状4种类型;组合构造形态可分为阶梯状、叠瓦状、梅花状、地堑式、地垒式和定向排列6种类型。通过与震积岩的特征类比和对地震作用特征分析可知,蒙古国南贝尔凹陷白垩系形态多样的泥质软沉积变形构造是地震作用的产物,其垂向序列自下而上为地震活动衰减期形成的地垒式组合构造和波状构造单元、地震活动停滞期形成的地堑式组合构造和阶梯状组合构造单元及波浪作用形成的泥质软沉积变形构造(组合)准原地沉积单元(包括眼状、螯状构造和叠瓦状、梅花状、定向排列等组合构造)。这些泥质软沉积变形构造主要分布在白垩系下宗巴音组,说明这一时期是控盆边界断裂和盆内主要断裂(如中央断裂)活动相对强烈的时期。更多还原

【Abstract】 Based on observation of drilling cores,a lot of mud soft sedimentary deformation have been found in South Bell sag,Mongolia.There arc many types of specific shape such as nipper,eye,tail,wave and combination shape such as ladder,imbricate,quincunx,graben,horst,orientation array,and so on.These mud soft sedimentary deformations are regarded us the result of earthquake.The vertical succession of mud soft sedimentary deformation,from bottom to top,is B unit (including horst-shape;and wave-shape structure formed in the depletion period of earthquake),C unit (including graben-shape and ladder-shape structure formed in thestagnant period of earthquake),and D unit caused by tsunami (including shape of imbricate,quincunx,nipper,eye,orientationarray and so on).These mud soft sedimentary deformation mainly distributes in lower Zongbayin formation,which illustrates that it isthe main active period of basin controlling faults and main faults (such as the major central fault) in basin.更多还原