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Features and Causes of Indosinian Structures in the Xuefengshan Tectonic System

Author: WangTao
Tutor: LiSanZhong
School: Ocean University of China
Course: Marine Geology
Keywords: Indosinian movement Triassic South China Xuefengshan Angular unconformity Yangtze Block
CLC: P542.2
Type: Master's thesis
Year: 2010
Downloads: 97
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Abstract


South China blocks east, including the Yangtze and Huaxia block Xuefeng intracontinental tectonic system is the Yangtze Block important part. This paper in-depth investigation of the Xuefeng Mountain region and study the Indosinian tectonic deformation process of the South China inland areas, is of great significance to an understanding of the Early Mesozoic tectonic evolution of South China. On the Xuefeng Mountain basement uplift with both sides of a large number of field investigation, analysis the ancient the geographical outlook and granite distribution focus from the point of view of the distribution and characteristics of the Indosinian unconformity Indosinian fold characteristics and fracture characteristics. Structural analysis and geophysics, petrology, the paleomagnetism knowledge and information sought to reveal the area the Indosinian tectonic evolution of the characteristics and the dynamic evolution of mode. Finally, draw the following conclusions: (1) Indosinian angular unconformity distribution pattern: high-angle unconformity - micro angular unconformity - parallel unconformity - integration of four graded area from east to west, and space distribution area from east to west in turn graded Oligocene. Accordingly, we can, the South China Indosinian tectonic movement or tectonic deformation intensity from east to west, from strong to weak, and the early deformation range of large, late gradually eastward retreat. (2) The the intracontinental deformation boundary effect: Indosinian study area at the edge of the North and South have a strong north-south compression, but developed from north to south the arc structure line and the North East to the constructor line, its important One reason is that in the same tectonic effect by the intracontinental different boundary control has nothing to do with the ancient Pacific Qinling - Dabie orogenic belt has nothing to do. (3) The difference in rotation result in two acts intracontinental deformation: to tectonic line original Indo-early NEE may also NNE to NE trending is the late Indosinian clockwise rotation displacement as the NEE to orientation today, and the late Indosinian NNE trending fold is still early under the same stress direction (both belonging to the Paleo-Tethys tectonic domain), means that the entire South China Indosinian after rotating the whole rotation, there is no China and Yangtze blocks the difference in rotation; difference between the rotation and the Indosinian China and Yangtze blocks. (4) The South and the North tectonic line perpendicular pattern: Yangtze block internal the Indosinian overall trending tectonic lines and stuff axial Qinling - Dabie orogenic belt and south of the Yangtze block things axial tectonic line phase vertical, the reason is: the Yangtze Block China plots eventually land shrinkage deformation than the Yangtze Block and the North China block along the Qinling - Dabie orogenic belt of land between the collisional earlier early Indo- pre-existing NNE trending tectonic line in late Indosinian displacement due to the clockwise rotation of the Yangtze block NEE; new second act structure line is the same as the the early first act deformation tectonic stress direction form a NNE-trending; Qinling - Dabie orogenic the EW tectonic line depends on the nearly east-west boundary of the southern margin of the North China Craton and its original orientation overall nearly EW. These complex boundary conditions and the rotation of the formed first the nearly vertical tectonic line with each other, then spliced ??to form a line perpendicular current tectonic pattern.

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CLC: > Astronomy,Earth Sciences > Geology > Structural Geology > Tectonic movement > Fold movement , orogeny
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