| 秦岭造山带中秦岭群内初始北北东向构造方位及其地质意义 |
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| 引用本文： | 郭进京.秦岭造山带中秦岭群内初始北北东向构造方位及其地质意义[J].地质调查与研究,1998,21(1). |
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| 作者姓名： | 郭进京 |
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| 作者单位： | 西北大学地质系,西安,710069 |
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| 摘 要： | 通过对秦岭造山带中古元古代结晶基底岩群之一-秦岭群详细的构造研究，识别出了秦岭群中存在的初始的NNE向构造方位，这一构造方位与中晚元古代以来秦岭造山带NWW向主导性构造方位大相径庭。结合区域地质背景分析，讨论了这一NNE向构造方位的地质意义。提出了古元古代华北克拉通与杨子克拉通可能为一个统一的克拉通，暂称之为古中国克拉通，并且这一克拉通内的主导性构造线方位是NNE向。中元古代初，这一克拉通沿NWW向破裂，才开始了秦岭造山带长期复杂的构造演化历史。
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| 关 键 词： | 秦岭造山带 秦岭群 构造解析 NNE向构造格局 古中国克拉通 |
| 修稿时间： | 1997－10－07 |
IDENTIFICATION AND IMPLICATION OF THE ORINGINAL NNE-TRENDING STRUCTURE OF QINLING GROUP IN THE QINLING OROGENIC BELT |
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| Guo Jinjing.IDENTIFICATION AND IMPLICATION OF THE ORINGINAL NNE-TRENDING STRUCTURE OF QINLING GROUP IN THE QINLING OROGENIC BELT[J].Geological Survey and Research,1998,21(1). |
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| Authors: | Guo Jinjing |
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| Abstract: | Based on the detailed structural analysis of Qinling Group, one of thePalaeoproterozoic metamorphic crystallized basement fragments distribured in the core zone of theQinling Orogenic Belt was recongnized, and the original NNE - trending structures, which iscontrating to the dominated NWW - trending structures in the Qinling Orogenic Belt, wasidentified in the Qinling Group. Tectonic implication of the oringinal NNE - trending structuresof the Qinling Group was discussed in combination with the regional goological Setting. It issuggested that North China and Yangtze Cratons had ever been a unified craton, calledPalaeosinica Craton, within which NNE - trending structural framwork was dominant, untill tothe end of Palaeoproterozoic. The long and Complex history of tectonic evolution of the QinlingQrogenic Belt began with the fracture in the Unified craton at the begining of Mesoproterozoicage. |
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| Keywords: | Qinling Orogenic Belt Qinling Group NNE-trending stractures Palaeosinica Craton |
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