RESEARCH ON DETECTION AND ACTIVITY OF THE HENGGANG BRICKYARD FAULT IN RUICHANG CITY, JIANGXI PROVINCE

In the fault activity survey, we found much more fissures in the Henggang Brickyard in Ruichang City, Jiangxi province. The overall trend of the fissures is NE, the fissures distribute densely in a "cluster" shape, with length more than three hundreds. And filled by gray-white and light gray minerals Through the analysis, this paper considers that there is a north-east trend steep normal fault, with south-east strike and dip angle 60°~75°. Local trench excavation exposes that one of the fault planes diastrophism the Quaternary slope alluvial material, the fault occurrence is 155°∠71°, fault strike NE 65°, upside down, stagger distance up to 3 m (not reveal bottom). The fault is straight, we can clearly visible scratches on the fault plane, and five 1~2 m long scraping grooves with 5~20 m deep. These display the fault is left-lateral dip-slip. Through ESR to date the strata sediment from upper breakpoint, the age range is 0.27~0.42 Ma. Research showes that this fault is significantly active in Middle Pleistocene, it is a Middle Pleistocene active fault. It is analysed that the development of ground fissures in this area are controlled by the Henggang Brickyard fracture, the forming of fissures responded to the activity of Henggang Brickyard fracture in Quaternary.