苏南推复构造初步探讨

A PRELIMINARY DISCUSSION ON NAPPE STRUCTURE IN SOUTHERN JIANGSU

张兆燕

Zhang Chaoyan

江苏石油地质大队

Brigade of Petroleum Geology of Jiangsu

江苏南部推复构造十分发育,沈修志等曾对苏州和茅山的推复构造已有论述。在苏州太湖地区,由南西湖州金盖山起,经太湖东山、西山、玉屏山、正山至阳山的北东方向上发育了一系列的推复体,由于后期的剥蚀,形成了众多的飞来峰和构造窗。

In this paper the nappe structure developed in southern Jiangsu is discussed.The Devonian strata rest on the Permian strata in many places of Taihu and Jiangyin areas, the paleozoic folds taking a shape of "sole"are overthrusted on the Late Jurassic volcanics in Maoshan moun-tain range, and the Pre-Cambrian strata of "Taizhou Buried Hill" are lying on the red beds of the Cretaceous.All these are evidence suggesting the multitype, multidirectional and multistage feature of the nappe structure. The nappe swarms in Taihu and Jiangyin areas are caused by the Kunjia block uplift and their roots are located approxima tely in Kunshan-Jiashan area.If the outcrops of the Devonian formation in Jingjiang and Nantong areas are also proved rootless, then the maxium displacement of the nappes will probably reach seventy five Kilometers.As nappe structures may act as barriers to oil and gas migration, their practical significance is as important as that of unconformity. In field and research work, attention should be given to identifying these allochthonous sheet-like blocks.

https://doi.org/10.11781/sysydz198103171