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Clouds nappe geological characteristics and kinetic analysis

Author: HuGuangYing
Tutor: ZhangBing；ZhangShiTao
School: Kunming University of Science and Technology
Course: Structural Geology
Keywords: Nappe Geological features Kinematics Dynamics Clouds
CLC: P542.2
Type: Master's thesis
Year: 2009
Downloads: 82
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Abstract


Clouds located in the southwest \In the land resources survey project \overlying structure, the region from north to south east west Ordovician Devonian strata are not autochthonous system, but rather comes from the north western stamped exotic nappe. Clouds nappe whole was a \30 km. The head of water nappe nappe Mountain fault-based slip plane along its North West - South East direction developmental series of secondary thrust thrust faults, are the North East strike, dip the North West. These faults form the clouds nappe imbricate thrust system. Based on the characteristics of nappe development, thrusting into the clouds for the striker squeezed belt, Central imbricate zone and root development after the exhibition with three main bands. Striker exposed in the clouds with a white Tsuchida - Water Head Mountain area, about 6 km. The striker head with water mountain - east village faults push cladding Devonian - Carboniferous - Permian limestone, chert and basalt stamped footwall Triassic Emeishan - Jurassic (feldspar ) quartz sandstone and silty mudstone above. Rewind the tape to the development of numerous and recumbent fold as the main feature, all kinds of structural stress analysis have shown that deformation area E-W trending NW-SE compressive stress and the thrust direction; Central imbricated with auspicious from Midu Zhuang - White clouds Tsuchida - with a total length of 20 km. To develop a set of substantially parallel orientation North West thrust system is characterized by the formation or between different strata within the same imbricated occurred after the demo pushover. The band also developed a series of slanted folds and overturned fold, fold the bit states and deformation mechanisms with the entire force nappe mechanisms coincide. Roots exposed in the study area with the North West region and the north of the northern cloud area, mainly see Ordovician quartz sandstone and sandy shale thrusting in Silurian limestone Kang Gallery group above. In this study, field surveys as the main means for clouds in the forward extrusion nappe belt, Central imbricated after exhibition and root zones with geometry and kinematics analysis, based on the combination with previous studies on regional tectonic setting results for clouds nappe tectonic evolution mechanisms and kinetics models were discussed. Raised clouds nappe in Paleogene India - Eurasian plate subduction, collision led to the Jinsha River - Red River fault and strike-slip fault zone Chenghai regional tectonic movement formed under the background. Since the two subduction, collision at the beginning of regional tectonic stress appears as the main east-west pressure, Indochina South East extrusion, the Red River fault zone began sinistral strike-slip faults occur simultaneously Chenghai dextral movement and the formation of a Groups northeast-trending fault system secondary. In this configuration context, the Red River fault zone along a series of north-eastern wall of rock tendencies North West thrust faults occur from north west - south east thrusting. Accordingly, the clouds nappe formation and development period is divided into three times, and three times with the formation of the Indian - Eurasian plate subduction, collision three stages of tectonic movement is relative to the corresponding coordinate.

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