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长期以来对西以郯—庐断裂带为界,东以嘉山—淮阴—响水断裂为界,江苏北部淮(阴)—海(州)变质岩区的构造性质有各种不同的认识。本文从大范围区域重、磁场特征分析,探讨了这一地区郯庐断裂带两侧的构造性质及其成因上的联系,并得出以下的认识:①淮海变质岩区为一多重推覆构造区;②郯庐带西侧的弧形构造为一重力滑推与推覆构造,其成因与郯庐带东侧属华北地台的下元古—元古界变质岩,和其上部沉积盖层成为扬子地台上部的推覆体及其构造发展有直接原因;③扬子地台北向推进及改变推进方向是两侧构造成生、发展的主要原因;④扬子与华北两大地台间在西部郯庐带与北部苏鲁交界附近只有碰接,而不存在
For a long time, there are various understandings on the tectonic properties of the Huai (Yin) - Hai (state) metamorphic rock area in the north of Jiangsu Province, which is bounded by the Xi-Lu-Lu fault zone in the west and the Jiashan-Huaiyin-Xiangshui fault in the east. Based on the analysis of heavy and magnetic fields in a wide range of regions, this paper discusses the tectonic and genetic relationships between the two sides of the Tanlu fault zone in this area and draws the following conclusions: ① The Huaihai metamorphic area is a multiple nappe Tectonic zone; ②The arc structure on the west side of the Tanlu zone is a gravity-sliding and nappe structure. The origin of the arc-shaped structure is the Lower Paleo-Proterozoic metamorphic rocks of the North China Platform located in the east of the Tanlu Zone and its upper sediments The caprock becomes the nappe body and the tectonic development of the upper part of the Yangtze platform. (3) The main reason that the north platform of the Yangtze platform advancing and changing the propulsion direction is the formation and development of both sides. (4) There is only a close encounter between the western Tanlu belt and the northern Sulu junction, but it does not exist