江苏境内华北与扬子岩石地层区界线划分

以构造演化的活动论、地质发展历史的阶段论、岩石生成的时空联系论的观点 ,采用“层层剥皮”分析方法 ,根据江苏境内岩石地层序列、岩性特征、空间分布、沉积环境、含矿性、生物组合等情况按时间和空间 (华北和扬子岩石地层区 )对江苏境内岩石地层综合分区界线划分进行讨论 ,并就华北与扬子岩石地层区在江苏境内的界线 ,提出自北东向南西以海泗断裂—郯庐东侧断裂作为两者改造后的界线 ,其北西侧为华北岩石地层区 ,南东侧为扬子岩石地层区。依据江苏岩石地层时空分布实际情况 ,提出了江苏岩石地层综合分区的 7个原则 :1)岩石地层层序发育程度及其建造序列宏观岩性组合特征 ;2 )岩石生成环境 (古气候、古地理、古构造 )及其时空变化 ;3)生物群 (组合 )特征和生物分区 ;4 )区域变质岩生成时期及其特征 ;5 )区域岩浆岩生成时期及其特征 ;6 )区域地球物理场特征 ;7)区域大地构造属性。

DIVISIONAL PROBLEM OF THE LITHOSTRIGRAPHICAL PROVINCES IN JIANGSU

Based on the theories of activities of tectonic evolutional stages of geological historic development, and temporal-spatial connection of lithological genesis, and using the analytical method of “peeling layer by layer”, the lithostratigraphical successions within the Jiangsu province, their lithological features, spatial distribution, sedimentary environments, ore-bearing property, and biological assemblages are briefly introduced in the temporal and spatial order (North China and Yangtzi lithostratigraphical provinces). The boundaries between the lithostratigraphical subprovinces within the Jiangsu province are discussed. In addition, it is suggested that from northeast to southwest the Haizhou-Siyang Fracture——the eastern fracture of Tancheng-Lujiang Wrench Fault System may be used as the boundary between the North China and Yangzi lithostrstigraphical provinces within Jiangsu, on its northwestern flank being the Yangzi lithostrstigraphical province. Besides, according to the actual situation of the lithostratigraphical temporal and spatial distribution, seven principles of disvision of the lithostratigraphical provinces are propesed herein: 1) The development level of the lithostratigraphical successions and the macroscopic combination characters of the formation sequences, 2) Environments in which the rocks were formed (including paleoclimate, paleogeography, and paleostructure) and their temporal and spatial changes, 3) Biotic (assemblage) characters and bioprovinces, 4) Stage and characters of the forming of regional metamorphic rocks, 5) Stage and characters of the regional magmatic rocks, 6) Regional geophysical characters, 7) Attribute of regional geotectonic.