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Possession of Dongba Qingxian north of basement metamorphic rocks deformed and metamorphosed Characteristics

Author: YangGuoDong
Tutor: WangGenHou
School: Chinese Geology University (Beijing)
Course: Structural Geology
Keywords: North of Tibet Dongba Qingxian Basement metamorphic rocks Microstructural Deformation characteristics Deformation mechanism
CLC: P588.3
Type: Master's thesis
Year: 2005
Downloads: 80
Quote: 1
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Abstract


Paper the tenter regional geological survey as the basis to 1:250000 positions to the north of the main Tibetan Dongba Qingxian outcrop of basement metamorphic rocks tectonic deformation and metamorphism . Fieldwork on the basis of the microscopic structure and regional structure, tectonic deformation and metamorphism , tectonic thermal events isotope dating method of combining foliation / lineation measuring microscope microscopic deformation observed strain measurement , electron microprobe analysis . By studying the following understanding : ( 1 ) of the study area basement metamorphic rocks widespread relief antiform a penetrative foliation and stretching lineation , foliation formed , to form folds ; flattening of foliation , lineation EW trending . ② According to the results of the microscopic structure and electron microprobe analysis shows , basement metamorphic rocks of the study area has experienced at least three deformed and metamorphosed . ( 3 ) in the study area of basement metamorphic rocks of stress and deformation mechanism the stretch horizontal displacement role deformation results strain ellipsoid X and Y -axis strain while increasing the Z-axis strain decreases , that is, X gt ; Y gt ; 1 gt; Z, the result is the foliation than lineation development . ④ According to the basement metamorphic rocks metamorphic mineral assemblages in the study area for the main stage of the basement metamorphic rocks of the greenschist facies - amphibolite facies ⑤ ductile deformation temperature of 400 ℃ -600 ℃, pressure 0.3 - 0.8Gp . ⑥ main period of deformation and metamorphism occurs late in the Indo-Chinese movement , and Bangong Lake - Nu River in the early stages of the split .

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CLC: > Astronomy,Earth Sciences > Geology > Petrology > Classification of rocks > Metamorphic
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