Marine And Borehole-Ground High-power Electromagnetic Launch System Development

Marine in Cretaceous is always focused on the paleoclimate reconstruction of its extreme greenhouse climate in geological history, which is a typical example of earth system science by the international earth science research community. With the progressing of the studying of TEX86, one of the proxy indicators to reconstruction of ancient sea water temperature, we also can use it to reconstruction for lack faces or more widely and also broke through time limted of the geological history of stratum. In this paper, we use TEX86 in Sihetun, Chaoyang City, Liaoning Province (latitude 41°35’ 19.23" N, longitude 120°47’ 36.34" E) to study the profile paleoclimate and paleoenvironment reconstructed of Jehol biota Period.First, we determine paleogeography of Sihetun in northern Hebei - western Liaoning as 41.6°N, 120.7°E, basically the same as today with the stratigraph from Hauterivian to Albian about 12Ma which belongs to the Early Cretaceous. The age of the volcanic stone at the bottom of Sihetun is 133.46±0.18 Ma, belongs to Hauterivian. The age of the middle layer of the stratum containing the precious fossil is 125.2±0.9Ma, belongs to the early Aptian and the age of the top volcanic deposite is 121.8±1.3Ma as Albian.It is showed by the Oxygen isotope (δ18Op) that the average temperature of Liaoning Province the mid-latitudes (~ 42°N) from Barremlan to early Aptian was±3℃(Fuxin Formation) to 10±4℃(Yixian Formation) , which is similar to the climatic conditions in modern cool temperate latitudes. We can know the climate turned from cold, dry into warm and wet with entering the Cretaceous Aptian, until a long time hot environment of this area. The average temperature of the lake surface reached from 17.8℃to 22.0℃measured by TEX86. The palynological assemblage also showed a climate changed from cool, moist into warm and wet slowly, gradually in mid-Early CretaceousUnder the cool climatic conditions of the Jehol Biota in early Cretaceous , ectothermic vertebrates such as turtles, lizards, or amphibians may have hibernated, whereas endothermic animals such as mammals, non avian dinosaurs, birds, and possibly pterosaurs may have benefited from their integumentary structures (hair, feathers, or feather-like structures) as insulation devices, allowing them to keep sustained activity all year round. Later the climate change into warm and wet so that to build up the ecosystem structure and stability of Jehol biota.