Structural Features And Evolution Of Mesozoic-cenozoic Basins Around Jiamusi Uplifting In The East Of Northeast China

The tectonic deformation sequence and formation mechanism after Mesezoic in the eastof northeast China are still controversial, especially in aspects of the uplifting era ofJiamusi Uplifting and structural features, deformation stages, deformation time andevolution of Mesozoic-Cenozoic basins around Jiamusi Uplifting. Jiamusi Uplifting andits surrounding basins are selected to be the key research areas in this article. On thebasis of mastering previous data and research achievements and the tectonic dynamicsbackground of the research area, we observed and studied composition and structuralfeatures of several main basins, interpretted seismic reflection profiles measured in themain basins and confirmed structural features and evolution of Mesozoic-Cenozoicbasins around Jiamusi Uplifting in the east of northeast China.Jiamusi Uplifting and its surrounding basins mainly distribute on Jiamusi Massif.The wide uplift region, including Huanan Uplifting, Mishan Uplifting and HengshanUplifting, is referred to Jiamusi Uplifting. Its surrounding Mesozoic-Cenozoic basinsmainly include Sanjiang Basin, Hulin Basin, Boli Basin, Jixi Basin, Shuanghua Basin,Shuangyashan Basin and so on.Jiamusi Uplifting and its surrounding areas deposited upper Jurassic, Cretaceous,Oligocene and Miocene. The loss of Triassic and lower and middle Jurassic reveals thatthe research area has undergone strong crustal uplift and weathering denudation beforelate Jurassic-early Cretaceous, which may be related to Paleo-Asian Ocean tectonicregime’ NS compression.During early Cretaceous, a series of NE-NEE trending extensional fault depressionsdeveloped in Sanjiang basin and Hulin basin, in addition, the closer of the fault whichcontrol the fault depressions, the larger of the thickness of the coeval sedimentary stratain the upper wall of the fault was. Overall there is a character of the NE trending extensional Basin-Rang coupling system in the research area, probably controlled byon-going regional NW-SE extension as a result of low-angle subduction of Iraq’s ze asplates from SE to NW direction.From late Cretaceous, maybe because of the compression of NWW-SEE direction,early extensional fault depressions generally got seriously destroyed or occurred tectonicreversion which led to the regional uplift in Sanjiang basin and Hulin basin, upperCretaceous Series was denuded and a series of NE-NNE huge thrusting nappe structure.Afterwards, local lower location of the structure formed due to fault obduction preventedthe superficial part. The sedimentary thickness of clastic rock built developed within itgot thinner from lower location of the structure to two sides. The basin had a character ofcompressional depression basin, and Jiamusi Uplift which rises highest now began to riseduring this stage, but its Uplift height is lower than western region. Overall the researchregion showed a character of Basin-Rang coupling system which included thrustingnappe structure and compressional depression basin. This squeezing action probably wasrelated to the high-angle subduction，destruction of Iraq’s ze as plates and the beginningof Pacific plate’s subduction.From Oligocene of Paleogene, a series of small scale fault-propagation folddeveloped in Sanjiang basin, fold axis trended near east to west, and the overlyingsedimentary strata of Oligocene to Miocene had a character of growth strata; Hulin basinspread near east to west, and the sedimentary thickness of strata became thinner from thecenter to north-south border. It was a compressional depression basin like a dish. Thesebasins such as Boli, Jixi, Shuangyashan commonly developed crystalline basementwhich thrusted to the lower cretaceous from south to north or north to south in theresearch area. So the research area got near NS-trending extrusion action in this stage andthis situation continued to Miocene. Probably, it was related to left-lateral convergentstrike-slipping from Dunhua-Mishan fault zone and Jiamusi-Yitong fault zone locatedthe east and west side of the research area in Late Paleogene to Early Neogene, and thestrike-slipping was response to the Pacific plate rapid subduction from NNW to NW in42.4Ma.In conclusion, this text researched the structural deformation characters ofMesozoic-Cenozoic basins around Jiamusi uplift in the different geological time byinterpretation of the seismic profile and detailed field geological survey. Thedevelopment evolution elementarily coincided with the coeval geotectonic andgeodynamic background in the research area.