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苏北地区前陆变形特征与形成机制

, PP. 366-376

Keywords: 苏北盆地,苏鲁造山带,郯庐断裂带,前陆变形,印支期,海相盖层

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Abstract:

郯庐断裂带以东、苏鲁造山带南部的苏北地区,由于苏北盆地的大面积覆盖使得长期以来对该区前陆变形构造特征与形成机制了解不够。苏北盆地的大量勘探资料分析及其南侧海相盖层露头的系统观察表明,苏北地区海相盖层在中三叠世末印支期普遍遭受前陆变形而成为前陆褶断带,盖层与基底之间出现了区域性滑脱面。该前陆变形区自西北向东南可划分为根带、中带与锋带。海相盖层内逆冲断层与褶皱的走向自西向东呈现为由北北东向转变为北东东向的弧形变化,显示了郯庐断裂带左行平移牵引的影响。各类构造特征与海相盖层剥蚀程度表明,苏北地区前陆变形随着接近苏鲁造山带和郯庐断裂带而增强,远离则减弱。苏北地区前陆变形构造特征及变化规律,指示其变形动力来自北部苏鲁造山带的碰撞造山,前陆变形发生在造山带陆壳深俯冲阶段。前陆变形构造走向上的弧形变化及强度的向西增强是郯庐断裂带在前陆变形阶段左行平移的影响结果,并非后期平移改造所致,进而支持该断裂带在造山期发生了强烈的左行平移的认识。

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