燕辽裂陷槽中元古界不整合面的性质  

The attributes of the Mesoproterozoic unconformities in the Yanliao rift trough

作　　者：曲永强[1] 潘建国[1] 梁利东[2] 杨祖锋 王海龙[1] 

机构地区：[1]中国石油勘探开发研究院西北分院,甘肃兰州710020 [2]中国建筑材料工业地质勘查中心宁夏总队,宁夏银川750021 [3]重庆市地质矿产勘查开发局107地质队,重庆401120

出　　处：《沉积与特提斯地质》2012年第2期11-22,共12页Sedimentary Geology and Tethyan Geology

基　　金：中国科学院知识创新工程重要方向项目(KZCX2-YW-Q04-04)资助

摘　　要：燕辽裂陷槽中元古代沉积层序中出现多个沉积间断和不整合面。本次研究对其中的5个不整合面进行野外考察,分析其地质特征并进行地层对比,最后判断其性质。大红峪组底部、高于庄组底部和杨庄组底部的不整合面是沉积属性,其中大红峪组底部不整合面是海侵超覆沉积的结果,高于庄组底部和杨庄组底部的不整合面由海平面升降变化所引起;铁岭组顶部和下马岭组顶部不整合面是构造属性,系大规模的抬升运动所造成。There exist several depositional breaks and unconformities in the Mesoproterozoic successions in the Yanliao rift trough.The examination of the attributes of the unconformities in this study is based on the field investigation,geological characteristics and stratigraphic correlation.The unconformities at the bottom of the Dahongyu,Gaoyuzhuang and Yangzhuang Formations are interpreted to be of sedimentary origin.On the whole,the unconformities at the bottom of the Dahongyu Formation resulted from the transgressive onlap;those at the bottom of the Gaoyuzhuang and Yangzhuang Formations are attributed to the eustatic fluctuations,and those at the top of the Tieling and Xiamaling Formations are caused by the large-scale tectonic uplift and thus have a tectonic origin.

关 键 词：燕辽裂陷槽 中元古界 不整合面 海侵超覆 构造抬升 

分 类 号：P534.3[天文地球—古生物学与地层学]