| 东南极埃默里冰架东缘赖茵博尔特丘陵构造变形过程及其构造意义 |
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| 引用本文： | 刘健,赵越,刘晓春,崔建军,胡健民.东南极埃默里冰架东缘赖茵博尔特丘陵构造变形过程及其构造意义[J].极地研究,2011,23(4):299-309. |
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| 作者姓名： | 刘健 赵越 刘晓春 崔建军 胡健民 |
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| 作者单位： | 中国地质科学院地质力学研究所 |
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| 基金项目： | 国家自然科学基金项目(40776004); 国土资源大调查项目(1212010711509)资助 |
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| 摘 要： | 对赖茵博尔特丘陵地区的构造变形过程分析表明,该地区发育4期主要构造变形.D1期主要是区域性近EW向片麻理形成阶段,其变形时代为＞970 Ma；D2期是在正片麻岩形成了近EW向轴面陡立韧性剪切褶皱,以及剪切面理上发育的各种紧闭不对称褶皱和低角度拉伸线理,其变形时代为新元古代早期.D3期变形发生在寒武纪早期,以构造抬升至地...
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| 关 键 词： | 早寒武纪 埃默里冰架东缘 构造变形 甘布尔采夫冰下山脉 |
| 收稿时间： | 2011-03-16 |
MULTIPLE DEFORMATIONS IN THE REINBOLT HILLS OF THE EASTERN AMERY ICE SHELF,EAST ANTARCTICA, AND THEIR TECTONIC IMPLICATIONS |
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| Liu Jian,Zhao Yue,Liu Xiaochun,Cui Jianjun,Hu Jianmin.MULTIPLE DEFORMATIONS IN THE REINBOLT HILLS OF THE EASTERN AMERY ICE SHELF,EAST ANTARCTICA, AND THEIR TECTONIC IMPLICATIONS[J].Chinese Journal of Polar Research,2011,23(4):299-309. |
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| Authors: | Liu Jian Zhao Yue Liu Xiaochun Cui Jianjun Hu Jianmin |
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| Institution: | Institute of Geomechanics, Chinses Academy of geological Sciences |
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| Abstract: | Based on structural analysis and available geochronological data, four principal episodes of deformation (D1-D4) are distinguished in the Reinbolt Hills of the eastern Amery Ice Shelf, East Antarctica. The D1 deformation took place at >970 Ma and is responsible for the formative stage of the WE-trending regional gneissosity in metamorphic rocks. The D2 deformation is characterized by the EW-trending folds with steep axial plane occurred in orthogneisses during the early Neoproterozoic. Tight asymmetrical folds and low-angle stretching lineations developed on the shear foliations of the rock during this period. The D3 deformation is marked by high-angle normal faults resulted from the early Cambrian tectonic uplift. The emplacement of charnockites in the Jennings Promontory may also be related to this deformational event. The D4 deformation is responsible for the NE-NNE-trending fracture cleavages in the Reinbolt Hills and Jennings Promontory probably formed during the late Mesozoic to Cenozoic. The D1 and D2 deformational episodes in the Reinbolt Hills could be comparable with those in the northern Prince Charles Mountains, suggesting that the Rayner Complex might be extended eastward to the Reinbolt Hills. Taking into account the occurrence of the early Cambrain (i.e. Pan-African) charnockites in the Jennings Promontory, we infer a nearly SN-trending tectonic boundary separating the Reinbolt Hills and Jennings Promontory. Therefore, the Prydz belt might not extend westward to the Lambert terrane, but southward to the Grove Mountains and Gamburtsev Sub-glacial Mountains. |
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| Keywords: | Early Cambrian the eastern Amery Ice Shelf tectonic deformation Gamburtsev Sub-glacial Mountains |
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