The Research Of Sedimentary Environment And Ancient Ecological Restoration Of Lower Carboniferous In Northern Chaohu

The area of Northern Chaohu is located in the northern Yangtze plate edges,the carboniferous well developed,widely distributed,and has obvious sedimentary characteristics.Through detailed field measurement to nest in north region and system of petrology,sedimentology and paleoecology,especially the carbonate rock microfacies study,analysis of characteristics of the carboniferous sedimentary environment evolution and ancient ecological environment.First to study the field formation of lower carboniferous in the area of typical section profile measuring system,describe the macroscopic characteristics of rocks and sedimentary marks,systematically collected samples,microscopic characteristics were observed in indoor rock chips,especially the chip type,bioclastic combination characteristic in detail,such as appraisal and description,on the basis of the divided into nine rock microfacies.In the northern part of chaohu,the pattern of carboniferous deposition is mainly:the open platform facies pattern,corresponding to the jinling group,and the limestone section of the lower part of the state group;Tieping-lagoon-sand dam facies pattern,corresponding to the high liaoshan group;The lagoon facies model of the very shallow water tide level,which corresponds to the fourth cycle of the state group and the fifth back of the top;The bioclastic shoal facies model corresponds to the block limestone of the fifth and sixth cycle of the state group.Through the strata in the macro fossils,microfossil and combination of raw crumbs,ichnofossil research,summarizes the jinling group,high mount li group,and state of the ancient ecological type,and state group divided into six kinds of ancient ecological environment.