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苏南地区的逆掩—推覆构造以及本区发育的二叠系龙潭煤系,前人在此作了大量的研究,取得了许多可贵的成果。笔者在从事该区重磁资料的深部构造研究时,对本区的推覆构造也有了较多的认识。大量的资料表明,推覆构造具有明显的重磁场特征,并且龙潭煤系地层也受到了推覆构造的控制,影响了煤系地层的赋存。本文试图通过分析苏南龙潭煤系的沉积概况、区内区域构造背景和广泛发育的逆掩—推覆构造的重磁场特征,初步研究推覆构造与煤系地层的保存等问题。
The reverse cover-thrust structure in the southern part of Jiangsu Province and the Permian Longtan coal measure in this area have been studied by many people and many valuable achievements have been made. When I studied the deep structure of gravity and magnetic data in this area, I also had more understanding of the structure of the nappe in this area. Numerous data indicate that the nappe structures have obvious characteristics of heavy and magnetic fields, and the Longtan coal measures strata have also been controlled by nappe structures, affecting the occurrence of coal measures strata. This paper attempts to study the depositional situation of the Longtan coal measures in the southern Jiangsu Province, the tectonic setting in the area and the gravity and magnetic field characteristics of the extensive overthrust-nappe structure in the area, so as to initially study the preservation of the nappe structure and the coal measure strata.