鲁西隆起与歧口凹陷耦合机制

山区固体矿产地质研究和盆地油气地质研究是地质学两个重要的研究领域,但是由于部门的划分而导致两者研究各有侧重,从而使两者研究的结合和借鉴远远不够。鲁西隆起由南至北分别展布有尼堒山-母子山、蒙山、徂莱山-新甫山-孟良岗、泰山-鲁山-沂山等四个隆起,而隆起之间则分布有泗平、汶蒙、肥城、莱芜等四个相邻的断陷,断陷与隆起之间均发育典型的铲状断裂,并控制着中新世的箕状断陷沉积;而歧口凹陷则以南大港和北大港潜山构造带为界划分为歧南、歧北、板桥三个次级凹陷,它们均呈北侧陡且深、南侧缓而浅的箕状不对称形态,具有"北断南超"的特点。其形态特征完全可以与鲁西隆起区的隆坳构造进行对比。笔者从幔枝构造的视角研究认为它们是鲁西隆起与歧口凹陷之山盆耦合形成的主要构造形迹。

The Tectonic Coupling between the Luxi Uplift and the Qikou Depression

The solid mineral resources in mountain area and the petroleum in basin are two main areas of geological researches, with different emphasis and normally assigned to different department, so that interdisciplinary investigation is scarce to date. The Luxi uplift consists of Nikunshan-Muzishan, Mengshan, Culaishan-Xinfushan-Mengliangang and Taishan-Lushan-Yishan etc. spreading from south to north, furthermore, among these uplift there are distributed four neighboring fault depressions i.e. Siping, Wenmeng, Feicheng and Laiwu fault depressions. Between the fault depressions and the uplift developed the typical listric faults which control the Miocene dustpan-shaped sediments in the fault depressions. In the case of the Qikou depression, there are three subclasses of depressions as Qinan, Qibei and Banqiao with Nandagang and Beidagang buried-hill structure belt as the boundaries and taken on the dissymmetry form with the northern side deep and steep, the southern side shallow and nearly flat. The Qikou depression was faulted in the north and overlapped in the south. Comparative study of the sag and the structure of uplift and depression in the uplift area of Western Shandong becomes an urgent need. From the point of view of mantle branch, the authors propose that both the Luxi uplift and Qikou depression have the main structural features formed through coupling of mountain and basin.