论文部分内容阅读
下扬子区位于秦岭大别造山带前缘，自中三叠世拉丁尼克期开始的构造活动受走滑断裂控制。在南北边界走滑断裂围限下，下扬子中生代地块呈一西南窄而东北宽的楔形。在该楔形体内，晚白垩世盆地群呈现有规律的展布，西南部盆地为长条状，ＮＥＮＥＥ走向，规模小，发育山麓相冲积扇相沉积，具有氧化条件；东北部的苏北盆地为面状展布，ＥＷ走向，规模大，湖相沉积为主，具有还原条件；中部盆地为左行斜列，ＮＮＥ走向，发育特征介于前两者之间。与此相应，断裂构造及沉积岩、火成岩的发育及分布也呈现有规律的变化。上列地质事实表明，下扬子楔形地块自西南向东北方向逃逸，西南部为挤压区，东北部为引张区，中部为过渡区，形成一幅如同土耳其安那托利安新生代的构造逃逸系统。
The Lower Yangtze region is located in the front of the Dabie orogen of the Qinling Mountains. The tectonic activities since the mid-Triassic Ladinnik period were controlled by strike-slip faults. Under the limit of strike-slip faults on the north-south boundary, the Mesozoic massif in the Lower Yangtze was a wedge shaped with a narrow southwest and a northeast wide. Within this wedge body, the Late Cretaceous basin shows a regular distribution. The basin in the southwest is long strip. The NENEE trend is small and the facies alluvial fan facies is deposited at the foothills of the foothills with oxidation conditions. In the northeastern Subei basin, The surface distribution, EW direction, large scale and lacustrine sedimentary are the most important, with the reduction conditions. The middle basin is the left row oblique row, NNE direction, and the developmental characteristics lie in the former two. Correspondingly, the development and distribution of faults, sedimentary rocks and igneous rocks also show regular changes. The above geological facts show that the lower Yangtze wedge block escapes from southwest to northeast, with the compression zone in the southwest, the lead zone in the northeast, and the transitional zone in the middle, forming a structural escape of the Anatolian Cenozoic in Turkey system.