医巫闾山变质核杂岩早白垩世伸展变形
Early Cretaceous extension of the Yiwulushan metamorphic core complex
查看参考文献47篇
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文摘
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对瓦子峪拆离断层带及下盘韧性剪切带中的构造岩进行构造变形及石英组构优选方位分析,这些构造岩的变形特点及分布规律显示伸展活动具有从高绿片岩相的脆-韧性变形向低绿片岩相的脆性变形演化的特点,展示了由浅部地壳向地表抬升的过程。上盘同伸展断陷盆地中地层发育特点和韧性剪切带中构造岩的同位素年代学数据显示早白垩世伸展作用随着时间的演化具有逐渐减弱和剪切带北部伸展作用持续时间比南部长的特点,此次伸展作用主要发生在132~117Ma。对比早白垩世与中、晚侏罗世的伸展方向并结合太平洋板块与依泽纳奇板块中生代的运动特点,推断医巫闾山地区中生代的伸展变形受到西太平洋地区板块活动的制约。 |
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其他语种文摘
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The deformation and distribution of tectonites along the Waziyu detachment fault and ductile shear zone in the lower footwall are analyzed by detailed field observations and laboratorial analysis. Based on the analyses of macroscopic deformation, microstructure and lattice preferred orientation of quartzs,we make sure that the evolution of the Early Cretaceous extension has the transition from the brittle-ductile deformation in high-greenschist faces to brittle deformation in low-greenschist faces,which shows the uplifting from shallow crust to near-surface. Analysizing the evolutionary processes of the Early Cretaceous extension combine the ~(40)Ar /~(39) Ar isotope ages of muscovites and other chronological dating in the ductile shear zone with characteristics of strata in the superposed extensional basin. The results support that the extension occurred at 132 ~ 117Ma and the deformation intensity was weakened gradually,moreover,the active period was longer in the north than in the south. The shear motion sense in the Yiwulushan area and the movement of the Pacific Plate and the Izanagi Plate in the different Mesozoic periods suggest the Mesozoic extension of the Yiwulushan area were controlled by the drifting of plates in the Western Pacific. |
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来源
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岩石学报
,2013,29(3):938-952 【核心库】
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关键词
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变质核杂岩
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拆离断层
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EBSD
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~(40)Ar /~(39)Ar
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医巫闾山
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地址
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1.
吉林大学地球科学学院, 长春, 130061
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沈阳地质矿产研究所, 沈阳, 110034
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-0569 |
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学科
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地质学 |
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基金
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国家自然科学基金
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国土资源部中国地质调查局项目
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吉林大学研究生创新基金
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文献收藏号
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CSCD:4851849
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