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地质学报  2005 

合肥―潢川盆地南缘中生代冲积沉积及其构造意义

, PP. 465-474

Keywords: 沉积体系年代体构造作用中生代合肥潢川盆地大别造山带中生代地层冲积扇盆地构造意义

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Abstract:

合肥―潢川盆地南缘中生代地层被划分为4个年代体(Chronsome)。年代体Ⅰ包括早侏罗世防虎山组和中晚侏罗世圆筒山组下部,由辫状河、曲流河以及滨一浅湖沉积体系组成,局限于盆地东端;年代体Ⅱ包括中晚侏罗世三尖铺组、朱集组和圆筒山组上部,下部为冲积扇沉积,中、上部为辫状河沉积,早期属于横向水流系统(南北方向),晚期是纵向水流系统(东西方向),近EW向的信阳―金寨―舒城断裂是其南部边界;年代体Ⅲ包括早白垩世早期凤凰台组、段集组、周公山组,前两组为冲积扇沉积,后者为辫状河和越岸沉积,粗碎屑明显向盆进积达数公里,南部边缘发育横向水流,而往盆地方向发育纵向水流。年代体Ⅳ为早白垩世晚期黑石渡组和陈棚组,南部边界是磨子潭晓天断裂和桐柏-商城断裂,断裂以伸展走滑为主,东段早期为冲积扇-扇三角洲沉积,晚期为深湖浊积岩沉积。晚白垩世沉积仅发育在西段局部地区,其余处于隆升状态。平行于大别山造山带的近EW向纵向断裂控制着年代体的南部边界,NE向郯城庐江断裂和商城麻城断裂控制着年代体侧向相的变化。合肥潢川盆地南缘沉积从东往西逐渐超覆,揭示大别造山带折返具有自东而西的递进特征。郯城―庐江断裂和商城―麻城断裂对年代体的发育有明显影响,郯城―庐江断裂控制着早侏罗世沉积,表明构造活动至少始于早侏罗世。

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