Environmental Evolution Since Late Quaternary In Zhangzhou Of Fujiang

Fujian province tectonically located in the east of Huanan fold system, and it has entered active evolving stage of close Pacific continental margin since late Triassic. Long geologic history belong to this specific tectonic environment made the structure active zone very complicated, and the active zone is continuously changed, but with obvious directivity—NE direction, and belted distribution. Zhangzhou, located in the Ming Dong volcanic fault depression which is one of the three big tectonic units in Fujian province, controlled by NE and NW two groups of mutual incised faults, is a fault basin dominated by the NW faults. The depositions in the study area changed because of the structure. For the convenience of study, we divided study area into 2 sub-area: zhangzhou subarea and Xingken-tianbao sub area.To study Zhangzhou basin, we integrated the results of Field trip, cores study of borehole, shallow seismic survey, structure interpretation and analysis, 14C analysis, and OSL dating, lithology, sediment facies, deposition cycling, sediment sequence, study of spore, pollen and alga, determined the stratigraphic evidence and lithology marker, unconformity, fault location and its active time,et. Apply chronology comparison and sequence methods to map the cross well histogram and 2D section isotime sequence scheme comparison map, raised a fine strata dividing and comparing plan. Quaternary is divided into Upper Pleistocene with Long Hai and Dongshan formation, Holocene with changle formation. At the same time, established a Basin analysis of isotime strata unit comparison and strata scheme. According to the analysis of detailed quaternary sedimentary granularity, foraminifer, and diatom, integrating with the typical lithology and lithofacies data of wells in the study area, understood the quaternary deposition environment and its development in the area.The study indicates that the evolvement history of quaternary and strata development in Zhangzhou area is integrity, but the starting time, type of formation, thickness and sediment characteristic are different with a mainly gulf...