渤海湾地区前第三系构造样式分布特征研究

A study of pre-tertiary structural characteristics and evolution in the Bohai bay region

通过渤海湾盆地内黄骅坳陷等潜山地震剖面的精细解释,结合周缘隆起区露头区野外构造考察,对渤海湾地区前第三系主要发育的拉张构造、挤压构造、走滑构造、负反转构造、重力滑动构造等5种进行了研究,这些构造在南北向上大致以沧东断裂、北西西向上大致以张家口-蓬莱断裂和齐河-广饶断裂为界分为六个区,不同区之间的构造线走向及构造样式组合存在较大差异.渤海湾地区前第三系的这种构造样式分布格局可能是印支期华北板块与北部的西伯利亚板块、南部的扬子板块先后闭合碰撞以及燕山中、晚期滨太平洋构造域影响作用不断增强和深部岩石圈的大规模减薄作用的结果.

Based on fine structural interpretation on seismic profiles of buried-hills in Huanghua depression in the 130hal Bay basin and outcrop survey in the western Shandong uplifted area and the intracontinental orogeny of Yanshan mountain, the paper has studied characteristics and distribution of pre-tertiary structural styles in the Bohai Bay region. There mainly develop 5 types of pre-tertiary structural style that are extension structure, compression structure, strike-slip structure, negative inversion structure and sliding structure in the Bohai Bay region. According to Cangdong fault of SN direction, Zhangjiakou-Penglai fault and Qihe-Guangrao fault of NWW direction, the Bohai Bay region can be divided into 6 sub-regions in which structural direction and style is different from each other. The distribution of structural styles in the Bohai Bay region is related to convergent between North China plate and Siberia plate to Yangtze plate in Indosinia movement and gradually reinforcing of the west circum-pacific tectonic tract and lithospheric thinning of North China craton in Yanshanian movement.