The research of land use/land cover change （LUCC） is the core content of global environmental change research and an important part of the sustainable development research. Taking the Midu County of western Yunnan P...The research of land use/land cover change （LUCC） is the core content of global environmental change research and an important part of the sustainable development research. Taking the Midu County of western Yunnan Plateau as the example, GIS technology was used to make the spatial overlay with the land use database in 2009 and land change survey database in 2014 of Midu County, so as to analyze the changes of land use of the county, and reveal the law of land use change, with the aim to provide the basis for further rational utilization of land resources.展开更多
The southeast margin of Tibet plateau mainly consists of the Western Yunnan plateau (WYP). The uplift and denudation at the southeast margin of Tibet plateau can be represented by that of the WYP. Based on the uplift ...The southeast margin of Tibet plateau mainly consists of the Western Yunnan plateau (WYP). The uplift and denudation at the southeast margin of Tibet plateau can be represented by that of the WYP. Based on the uplift of ancient plantain surface, river terrace and sedimentary response in peripheral basins of the WYP, suggest that the WYP experienced a rapid uplift and denudation in Quaternary. The WYP have been uplifted about 610～700m, and eroded away about 1095～1600m since Quaternary, average denudation rate reach 0 68～0 94mm/a. Uplift rates in different time interval were calculated according to river terrace. Relations between WYP and Tibetan plateau are discussed further..The Yinggehai basin located at the south termination of the Red River fault, it is the younger (mainly Neogene) pull\|apart basin, which developed at releasing bend of the Red River right\|lateral wrench fault. Since the Neogene, the subsidence center of the Yinggehai basin shifted southward and, connected with the Southeast Hainan basin. Both basins collected large amounts of the Holocene and Quaternary deposits of marine origin. They are peripheral marine basin of the WYP.. Silicate clastic sediments in both basins have been large supported from the WYP into both basins through the Red River system. The total volumes derived from the WYP in the Neogene and Quaternary is 2 8004×10 14 t(1 and 5 1206×10 14 t. The sedimentation rate in Yinggehai basin rose from 0 52mm/a in the Neogene to 1 39mm/a in the Quaternary. The facts that accumulation volume and sedimentation rate rose greatly after the Neogene, suggested a rapid uplift in the WYP. The rapid uplift was responsible for the unconformity between the Neogene and Quaternary. Elevation of ancient planation surface,and river terrace supported the rapid uplift of the WYP also. The ancient planation surface was elevated from 2500～2600m to 3000～3200m during Quaternary, seven terraces in Tue can be traced through the field area in elevation from 20 5m to 612m above the modern river surface in the Lancang River. The Jinsha River also incised into bed rocks about 700m in Shigu. All the facts suggest that southeast margin of Tibet plateau rose rapidly; the plateau was elevated about 610～700m in the Quaternary.展开更多
In south\|eastern margin of Tibetan plateau, the Western Yunnan area of China, the NNW\|striking faults are dominant active structures. Their dextral strike\|slips cause conjugate slips along NE\|striking faults, and ...In south\|eastern margin of Tibetan plateau, the Western Yunnan area of China, the NNW\|striking faults are dominant active structures. Their dextral strike\|slips cause conjugate slips along NE\|striking faults, and these left shears induce blocks’ clockwise rotations along vertical axes. For example, Simao Block in the south part of Western Yunnan is bounded by Red River Fault (east), Lancang—Gengma Fault (west), Nandinghe Fault (north), and Dian Bien Phu Fault (south); and the right shears of Red River Fault and Lancang—Gengma Fault induced conjugate left shear along Nandinghe Fault and Dian Bien Phu Fault, and laters’ sinistral slips caused clockwise rotation of the Block. This rotation has been proved by geodetic measurements (Jiang, et al., 1993) and palaeomagnetic measurement (Wu, et al., 1987). In Pu’er area, which is located in the central part of Simao Block, several small\|scale blocks are clockwise rotated by sinistral shears of NE\|striking faults (Wang Yang, 1996). Block rotation along vertical axis is main active deformation style in Western Yunnan.展开更多
基金Supported by the Graduates Program of the Fund for Scientific Research of the Education Department of Yunnan Province(2016YJS093)~~
文摘The research of land use/land cover change （LUCC） is the core content of global environmental change research and an important part of the sustainable development research. Taking the Midu County of western Yunnan Plateau as the example, GIS technology was used to make the spatial overlay with the land use database in 2009 and land change survey database in 2014 of Midu County, so as to analyze the changes of land use of the county, and reveal the law of land use change, with the aim to provide the basis for further rational utilization of land resources.
文摘The southeast margin of Tibet plateau mainly consists of the Western Yunnan plateau (WYP). The uplift and denudation at the southeast margin of Tibet plateau can be represented by that of the WYP. Based on the uplift of ancient plantain surface, river terrace and sedimentary response in peripheral basins of the WYP, suggest that the WYP experienced a rapid uplift and denudation in Quaternary. The WYP have been uplifted about 610～700m, and eroded away about 1095～1600m since Quaternary, average denudation rate reach 0 68～0 94mm/a. Uplift rates in different time interval were calculated according to river terrace. Relations between WYP and Tibetan plateau are discussed further..The Yinggehai basin located at the south termination of the Red River fault, it is the younger (mainly Neogene) pull\|apart basin, which developed at releasing bend of the Red River right\|lateral wrench fault. Since the Neogene, the subsidence center of the Yinggehai basin shifted southward and, connected with the Southeast Hainan basin. Both basins collected large amounts of the Holocene and Quaternary deposits of marine origin. They are peripheral marine basin of the WYP.. Silicate clastic sediments in both basins have been large supported from the WYP into both basins through the Red River system. The total volumes derived from the WYP in the Neogene and Quaternary is 2 8004×10 14 t(1 and 5 1206×10 14 t. The sedimentation rate in Yinggehai basin rose from 0 52mm/a in the Neogene to 1 39mm/a in the Quaternary. The facts that accumulation volume and sedimentation rate rose greatly after the Neogene, suggested a rapid uplift in the WYP. The rapid uplift was responsible for the unconformity between the Neogene and Quaternary. Elevation of ancient planation surface,and river terrace supported the rapid uplift of the WYP also. The ancient planation surface was elevated from 2500～2600m to 3000～3200m during Quaternary, seven terraces in Tue can be traced through the field area in elevation from 20 5m to 612m above the modern river surface in the Lancang River. The Jinsha River also incised into bed rocks about 700m in Shigu. All the facts suggest that southeast margin of Tibet plateau rose rapidly; the plateau was elevated about 610～700m in the Quaternary.
文摘In south\|eastern margin of Tibetan plateau, the Western Yunnan area of China, the NNW\|striking faults are dominant active structures. Their dextral strike\|slips cause conjugate slips along NE\|striking faults, and these left shears induce blocks’ clockwise rotations along vertical axes. For example, Simao Block in the south part of Western Yunnan is bounded by Red River Fault (east), Lancang—Gengma Fault (west), Nandinghe Fault (north), and Dian Bien Phu Fault (south); and the right shears of Red River Fault and Lancang—Gengma Fault induced conjugate left shear along Nandinghe Fault and Dian Bien Phu Fault, and laters’ sinistral slips caused clockwise rotation of the Block. This rotation has been proved by geodetic measurements (Jiang, et al., 1993) and palaeomagnetic measurement (Wu, et al., 1987). In Pu’er area, which is located in the central part of Simao Block, several small\|scale blocks are clockwise rotated by sinistral shears of NE\|striking faults (Wang Yang, 1996). Block rotation along vertical axis is main active deformation style in Western Yunnan.
