巴彦乌拉山老变质岩系中的构造片岩特征及其形成机制
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摘要
从宏观构造和显微构造的研究出发,探讨了广泛发育于巴彦乌拉山老变质岩系中的构造片岩特征及其形成机制。对石英、云母类等矿物的显微构造变形的分析揭示出区内构造片岩具有明显的脆—韧性过渡特征。巴彦乌拉山构造片岩是由早期的近水平顺层滑脱构造变形作用形成的,并经历了后期多期次韧性剪切作用产生的糜棱岩化作用的叠加改造。分析结果对于进一步研究巴彦乌拉山区域构造格架,恢复区域地质演化史有一定的借鉴价值。
The characteristics and formation mechanism of the tectonic schist in the old metamorphic rock series of Bayanwula Mountain,from the study aspects of macrostructure and microstructure. The analysis of microstructural deformation characteristics of quartz and mica minerals show that the brittleductile transition characteristics. The Baiyanwula Mountain tectonic schist is formed by the early near-horizontal slip structure deformations,and it is experienced the superposition transformation of the mylonitization action formed by the late stage ductile shearing effects. The above analysis results related to the tectonic schist in the old metamorphic rock series of Bayanwula Mountain can provide some reliable reference for the further study on the regional structural characteristics and restoration of regional geological history of the Bayanwula Mountain Area.
The characteristics and formation mechanism of the tectonic schist in the old metamorphic rock series of Bayanwula Mountain,from the study aspects of macrostructure and microstructure. The analysis of microstructural deformation characteristics of quartz and mica minerals show that the brittleductile transition characteristics. The Baiyanwula Mountain tectonic schist is formed by the early near-horizontal slip structure deformations,and it is experienced the superposition transformation of the mylonitization action formed by the late stage ductile shearing effects. The above analysis results related to the tectonic schist in the old metamorphic rock series of Bayanwula Mountain can provide some reliable reference for the further study on the regional structural characteristics and restoration of regional geological history of the Bayanwula Mountain Area.
引文
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[3]杨振升,徐仲元,刘正宏.高级变质区地质调查与综合研究方法[M].北京:地质出版社,2008.
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[5]凌贤长,刘春华.构造片岩评述[J].世界地质,1995(3):28-33.
[6]王根厚,贾建称,万永平,等.藏东巴青县北部酉西岩组构造片理形成及构造意义[J].地学前缘,2006,13(4):180-187.
[7]刘俊来.辽吉古裂谷内带顺层构造片岩的变形构造与变形机制[J].吉林地质,1991(4):1-9.
[8]邵和明.内蒙古自治区区域地质志[M].北京:地质出版社,1991.
[9]刘绍平,刘学峰.巴彦浩特盆地的构造类型[J].西南石油学院学报:自然科学版,2002,24(3):24-27.
[10]卢良兆,许文良.岩石学[M].北京:地质出版社,2011.
[11]吴汉宁.岩石的磁性组构及其在岩石变形分析中的应用[J].岩石学报,1988(1):96-100.
[12]耿元生,王新社,沈其韩,等.内蒙古阿拉善地区前寒武纪变质基底阿拉善群的再厘定[J].中国地质,2006,33(1):138-145.