额尔古纳地块中生代火山岩盆地基底构造特征:来自灵泉盆地的启示

发布时间：2018-04-10 07:14

本文选题：额尔古纳地块　切入点：灵泉盆地　出处：《地球科学》2017年12期

【摘要】：灵泉盆地布格重力异常特征表明灵泉盆地两侧重力低异常区主要为侏罗-白垩系断陷区,中部主要为基底隆起区.对布格重力异常进行向上延拓处理,结果发现深部地质体具有"东、西深,中间浅"分布特征;剩余重力异常也说明中部局部重力高主要反映基底隆起,东部和西部局部重力低主要反映侏罗-白垩系断陷.灵泉盆地基底断裂早期以北东向为主,晚期发育北西向断裂,区内还有早期近南北向和东西向断裂存在.将灵泉盆地构造单元划分为西部断陷区、中部隆起区和东部断陷区之后发现,灵泉盆地实际上是个相对隆起而不是断陷盆地,这是盆地发生构造反转作用的结果,额尔古纳地块上的其他中生代火山岩盆地普遍具有这种模式,额尔古纳地块中生代盆地基底总体上具有"南深北浅"的特点.
[Abstract]:The characteristics of Bouguer gravity anomaly in Lingquan basin indicate that the low gravity anomaly area on both sides of Lingquan basin is mainly Jurassic-Cretaceous fault depression and the central part is basement uplift area.The upward continuation treatment of Bouguer gravity anomaly shows that the deep geological body has the characteristics of "east, west depth, shallow middle" distribution, and the residual gravity anomaly also shows that the local gravity height in the central part mainly reflects the basement uplift.The local gravity low in the east and west mainly reflects the Jurassic-Cretaceous fault depression.The basement faults in Lingquan basin were mainly north to east in the early stage and NW in the late stage, and there were early faults in the near north and east to west in the area.The tectonic unit of Lingquan basin is divided into western faulted area, middle uplift area and eastern fault depression area. It is found that Lingquan basin is actually a relative uplift rather than a faulted basin, which is the result of tectonic inversion in the basin.Other Mesozoic volcanic basins on the Erguna block generally have this model, and the Mesozoic basin basement of the Erguna block generally has the characteristics of "the south deep and the north shallow".
【作者单位】：吉林大学地球科学学院;中国地质调查局沈阳地质调查中心;太原理工大学地球科学与工程系;俄克拉荷马州立大学地质系;核工业243大队;
【基金】：国家重点研发计划项目(No.2017YFC0601401) 内蒙古灵泉地区断裂、火山构造特征及其与铀多金属矿化关系研究项目(No.201255) 大兴安岭成矿带漠河-扎兰屯地区地质矿产调查项目(No.DD20160047) 额尔古纳-满洲里地区中生代内生铀及多金属区域成矿地质环境研究项目(No.200805)
【分类号】：P588.14

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