郯庐断裂带的脉动式伸展活动

Pulsative Extensional Activeites of the Tan-Lu Fault Zone

郯庐断裂带于晚白垩世至早第三纪经历了强烈的伸展活动 ,普遍控制发育了断陷盆地。断裂带中、南段的伸展活动起始于晚白垩世早期 ,而北段起始于早第三纪早期 ,具有明显向北迁移的规律。断裂带的伸展活动呈脉动式渐进发展。现已发现在晚白垩世至早第三纪该断裂带发生了 6次伸展事件 ,在所控制的盆地内相应有明显的沉积响应。断裂带伸展活动的影响和规模由早至晚逐渐扩大。这些伸展活动的迁移现象和脉动式发展与同期的太平洋板块活动有关。

The Tan Lu fault zone experienced intense extensional activities during the Late Cretaceous to the Early Paleogene. Thus, faulted basins were developed along the fault zone. The extension started from the earlier Late Cretaceous in the middle and southern segments of the fault zone whereas from the earlier Early Paleogene in the northern segment, showing a northward migration through time. The extensional activities present pulsative and progressive development. It has been identified that six extensional events took place from the Late Cretaceous to Early Paleogene. Correspondingly, depositional response occurred in the fault controlled basins. The extensional activities increased their influence and scope progressively. The extensional migration and pulsative development are related to the contemporaneous Pacific Plate movement.