Longmen Mountain located at the boundary between the Sichuan Basin and Tibetan Plateau,representing the steepest gradient of any edges of the plateau.Three endmember models of uplift process and mechanism have been pr...Longmen Mountain located at the boundary between the Sichuan Basin and Tibetan Plateau,representing the steepest gradient of any edges of the plateau.Three endmember models of uplift process and mechanism have been proposed,including crustal thickening,crustal flow,and crustal isostatic rebound.Here we use coeval sedimentary sequences in the foreland basin to restraint uplift process and mechanism in the Longmen Mountain.The more than 10,000 m thick Late TriassicQuaternary strata filled in this foreland basin and can be divided into six megasequences that are distinguished as two distinct types.The first type is the wedge-shaped megasequences which are sedimentary response of strong active thrust loading events,characterized by a high rate of subsidence and sediment accumulation,coarsening-upward succession and a dual-sourced sediment supply.This type includes Late Triassic,Late Jurassic to Early Cretaceous and Late Cretaceous to Paleogene megasequences.The second type is the tabular megasequences,characterized by the low rate of subsidence and sediment accumulation,finingupward succession,and a single-sourced sediment supply,which is sedimentary response of isostatic rebound and erosion unloading.This type includes the Early to Middle Jurassic,Middle Cretaceous and Neogene to Quaternary megasequences.Basing on sedimentary,active tectonic,geomorphic evidence,we infer that the direction has been reversed from SSWdirected sinistral strike-slip to NNE-directed dextral strike-slip during 40-3.6 Ma,and since 3.6 Ma,the Longmen Mountain thrust belt belong to times of isostatic rebound and erosional unloading with NNEdirected dextral strike-slip.This suggests that crustal isostatic rebound is a primary driver for uplift and topography of the present Longmen Mountain.The Wenchuan(Ms8.0) earthquake,which ruptured a large thrust fault with NNE-directed dextral strikeslip along the range front,is an active manifestation of this crustal isostatic rebound process with dextral strike-slipping and shortening.This process may be the cause for the Wenchuan Earthquake and the apparent paradox of high relief,little shortening,the relative dearth of historical seismicity in the region.展开更多
The four-seasonal movement is the general movement of the universe. Galaxies, living beings, society, man-made worlds and all substances have or take part in the four-seasonal movement. There are transverse four-seaso...The four-seasonal movement is the general movement of the universe. Galaxies, living beings, society, man-made worlds and all substances have or take part in the four-seasonal movement. There are transverse four-seasonal movement and longitudinal four-seasonal movement. The former is the breathing movement. All substances have the function of breathing. Breathing involves living beings, celestial bodies, society and man-made systems and living beings of different levels have different ways of breathing. The longitudinal four-seasonal movement of living beings is controlled by genes. The four-seasonal movement is confined. Life originates in seeds and seeds are generated in the four-seasonal movement. Thoughts, ideas, designs and methods are the seeds of celestial bodies, society and man-made worlds. Just like living beings, galaxies, and society also have reproductive function. Reproduction has three major means： self-generation, generation by augmentation and generation by transformation. The reproduction of living beings is self-generation while the reproduction of the solar system and other galaxies is generation by augmentation. Man-made objects, society and galaxies are formed with automatic organization of thoughts, thus called generation by transformation. The solar system and the earth have reproduction function. Living beings began with the combined action of the earth, the solar system and the universe. Life forms of the universe include dominant life and recessive life. Different forms of life transform continuously.展开更多
基金supported by the China National Natural Science Foundation (Grant No. 40841010,40972083,41172162)CGS Foundation (Grant No.1212011121268)Foundation from State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Grant No. SK-0801)
文摘Longmen Mountain located at the boundary between the Sichuan Basin and Tibetan Plateau,representing the steepest gradient of any edges of the plateau.Three endmember models of uplift process and mechanism have been proposed,including crustal thickening,crustal flow,and crustal isostatic rebound.Here we use coeval sedimentary sequences in the foreland basin to restraint uplift process and mechanism in the Longmen Mountain.The more than 10,000 m thick Late TriassicQuaternary strata filled in this foreland basin and can be divided into six megasequences that are distinguished as two distinct types.The first type is the wedge-shaped megasequences which are sedimentary response of strong active thrust loading events,characterized by a high rate of subsidence and sediment accumulation,coarsening-upward succession and a dual-sourced sediment supply.This type includes Late Triassic,Late Jurassic to Early Cretaceous and Late Cretaceous to Paleogene megasequences.The second type is the tabular megasequences,characterized by the low rate of subsidence and sediment accumulation,finingupward succession,and a single-sourced sediment supply,which is sedimentary response of isostatic rebound and erosion unloading.This type includes the Early to Middle Jurassic,Middle Cretaceous and Neogene to Quaternary megasequences.Basing on sedimentary,active tectonic,geomorphic evidence,we infer that the direction has been reversed from SSWdirected sinistral strike-slip to NNE-directed dextral strike-slip during 40-3.6 Ma,and since 3.6 Ma,the Longmen Mountain thrust belt belong to times of isostatic rebound and erosional unloading with NNEdirected dextral strike-slip.This suggests that crustal isostatic rebound is a primary driver for uplift and topography of the present Longmen Mountain.The Wenchuan(Ms8.0) earthquake,which ruptured a large thrust fault with NNE-directed dextral strikeslip along the range front,is an active manifestation of this crustal isostatic rebound process with dextral strike-slipping and shortening.This process may be the cause for the Wenchuan Earthquake and the apparent paradox of high relief,little shortening,the relative dearth of historical seismicity in the region.
文摘The four-seasonal movement is the general movement of the universe. Galaxies, living beings, society, man-made worlds and all substances have or take part in the four-seasonal movement. There are transverse four-seasonal movement and longitudinal four-seasonal movement. The former is the breathing movement. All substances have the function of breathing. Breathing involves living beings, celestial bodies, society and man-made systems and living beings of different levels have different ways of breathing. The longitudinal four-seasonal movement of living beings is controlled by genes. The four-seasonal movement is confined. Life originates in seeds and seeds are generated in the four-seasonal movement. Thoughts, ideas, designs and methods are the seeds of celestial bodies, society and man-made worlds. Just like living beings, galaxies, and society also have reproductive function. Reproduction has three major means： self-generation, generation by augmentation and generation by transformation. The reproduction of living beings is self-generation while the reproduction of the solar system and other galaxies is generation by augmentation. Man-made objects, society and galaxies are formed with automatic organization of thoughts, thus called generation by transformation. The solar system and the earth have reproduction function. Living beings began with the combined action of the earth, the solar system and the universe. Life forms of the universe include dominant life and recessive life. Different forms of life transform continuously.
