Study On The Exhumation Process From Late Jurassic Of Mohe Basin

Mohe Basin is located in the northern China, and connected to the Ushumun Basin inRussia, in the Chinese region of about21,500square km. Mohe basin is part of Xing’an-InnerMongolia geosynclinal fold belt. The basin is adjacent to Bureya terrane in east, to the Siberianplate southern edge of Mongolia-Okhotsk fold belt from north-east to the southern edge of thecorner. Mohe basin suture between Heilongjiang small block group and the Siberian plate.Basin structure is can be divided into "three uplift and one depression zone ": north BinHeilongjiang uplift, southwest Gulian River uplift southeast of Tahe uplift "three folders bulgewith central central depression zone". Peripheral basins of the Mohe Basin Daqing explorationarea should have good development potential, therefore, to study their structural characteristicsand hydrocarbon vision analysis has a very important practical significance. This paper is tostudy the Mohe basin as an object, use the structural geology research methods sedimentologyresearch methods and thermal geochronology research methods study of the Mohe Basin fracturesystem, structural characteristics, sedimentary evolution, and then explore Mohe Basin upliftprocess since the Late Jurassic.Based on a synthesis of field geological survey, geophysical data analysis, andgeochemical analysis, this study discuss Mohe Basin fault system, structural characteristics andproperties. Mohe basin total has75fault:25NE/NNE trending faults,20EW trending faults,23NW/NWW trending faults,7SN rending faults. The main features of the fractures in the basin:The south side of the north-trending faults is normal faults, and the master fracture has largescale and extension characteristics;Late Jurassic fracture has composed by EW-trending tensilefaults and the NE-trending faults;The Fracture is in zonal distribution within the basin, theactivity, strength, and the scale has obvious differences by the different faults, the EW-trendingand the NE-trending faults have the most activity.The Mohe Basin deposited Xiufeng, Er’shi’erzhan formation, Emuerhe formation, Kaikukang formation during the Middle Jurassic. The study observed in the wild outcrop, on thebasis of comprehensive analysis of the log and seismic data, This paper argues that the MoheBasin terrestrial lacustrine Jurassic Alluvial Fan Delta-lacustrine depositional systemdevelopment in the basin. Draw the Sedimentary facies schematic maps in Xiufeng formation,Er’shi’erzhan formation, Emuerhe formation, Kaikukang formation. Mohe Basin waterdevelopment darken gradually from south to north during Jurassic, and the tendency of variationof sedimentary facies displayed sub-deep lake–shore lake–fan (delta) front–fan (delta) plainfrom north to south. Erosion due to the uplift of the central part of the basin, formed a certainamount of basin provenance during the Er’shi’erzhan formation and Emuerhe formation, soalluvial fan facies–fan delta plain–fan delta front–shore-shallow lacustrine sedimentarysystems has been formed in Xing’an salient northwest side.Analysis the52sampling locations in Mohe Basin by using the zircon fission track datingmethod, determine that the Mohe Basin has twice uplift process at90Ma and135Ma, Xing’ansalient, Jingou salient and the western part of the basin has apparent rapid uplift since the LateJurassic.