郯庐断裂带的延伸与切割深度

采用地质 地球化学 地球物理相结合的方法，系统研究了中生代以来郯庐断裂带的延伸长度与切割深度。２５０～２０８Ｍａ期间，郯庐断裂带开始形成，延展长度不超过１５００ｋｍ，切割深度在１５～２０ｋｍ，是以左行走滑活动为主的基底断裂。１３５～５２Ｍａ时期，该断裂带大幅度地扩展了长度（达３５００ｋｍ），切割深度在３０～４０ｋｍ之间，为略具右行平移活动的正断层，属地壳断裂。２３３Ｍａ以来，断裂带以向下深切为主，深度从５０ｋｍ左右逐渐加深到８０～１００ｋｍ，终于形成岩石圈断裂

LENGTH AND PENETRATION DEPTH OF TANCHENG LUJIANG FAULT ZONE IN EASTERN ASIA

By combining the geology, geochemistry and geophysics the length and penetration depth of the Tancheng Lujiang fault zone since the Mesozoic are studied. The Tancheng Lujiang fault zone began to form in the period 250～208Ma (Indosinian stage) at which the length of the fault trace was less than 1500km, the depth of penetration was about 15～20km(a basement fracture) and the movement was characterized by sinistral strike slip. In the period 135～52Ma (Sichuanian stage), the length of the fault zone increased considerably to 3500km, the depth of penetration reached 30～40km (crustal fracture) and the movement was as a normal fault with a slight component of dextral strike slip. Since 23 3Ma (Miocene Holocene), the fault zone has penetrated into the lithosphere at a depth, that gradually increased from 50km to 80km (a lithosphere fracture).