| 内蒙古苏尼特左旗地区若干地质构造新发现及其构造属性的初步探讨 |
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| 引用本文： | 李述靖,高德臻.内蒙古苏尼特左旗地区若干地质构造新发现及其构造属性的初步探讨[J].现代地质,1995,9(2):130. |
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| 作者姓名： | 李述靖 高德臻 |
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| 作者单位： | China University of Geosciences，Beijing，100083 |
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| 摘 要： | 摘要：本文概述了在苏尼特左旗地区进行８幅１：５万地质旗图过程中所取得的新发现和重要进展。在变质地层方面：发现了早前寒武纪中深变质岩系，划分出中元古代浅变质地层，重新厘定了温都尔庙群的内涵；沉积地层方面：测制了下二叠统大石寨组和哲斯组的连续剖面，发现其底界与下元古界呈不整合接触；对新生代地层进行了较系统的专门研究，取得了不少新进展；侵入岩方面：进行了岩石谱系研究，划分出６个岩石超单元（序列）；构造方面：发现了３条韧性剪切带和一个大型推覆构造；在区内还发现了广泛分布的古人类活动遗址，采获了大量新石器。在此基础上，描述了主要形成于晚古生代末至早中生代的全区构造格架，初步总结了全区主要地质事件和区域构造演化概况，探讨了本区构造局性，认为本区仍位于古华北大陆块的范围内。
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| 关 键 词： | 苏尼特左旗，新发现，构造格架，构造演化，构造属性 |
NEW DISCOVERIES OF GEOLOGICAL STRUCTURES IN SONID ZUOQI OF INNER MONGOLIA AND DISCUSSION ON TECTONIC FEATURES |
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| Li Shujing ,Gao Dezhen.NEW DISCOVERIES OF GEOLOGICAL STRUCTURES IN SONID ZUOQI OF INNER MONGOLIA AND DISCUSSION ON TECTONIC FEATURES[J].Geoscience——Journal of Graduate School,China University of Geosciences,1995,9(2):130. |
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| Authors: | Li Shujing Gao Dezhen |
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| Abstract: | This paper is outlined the new discoveries and the important development during the mapping processes of eight 1:50 000 geological maps in middle Sonid Zuoqi,Inner Mongolia.On the metamorphic layers, there have been discovered the mid-hypometamorphic rock system of the early Pre-Cambrian and distinguished the Middle Proterozoic epimetamorphic layer from it. Also,the authors renewly stipulate the composition of the Wenduermiao Group.On the sedimentary strata,the authors measured the continuous section of Dashizhai Formation and Zhesi Formation of the Lower Permian and meanwhile found its lower boundary discordant with the Lower Proterozoic metamorphic layers. The relatively systematic and special study for the Cenozoic strata have been made and get the more new development. On the invasional rocks,the authors adopted the rock-lineage method and divided the rocks into six rock system units. About the structures, three ductile shear zones and a large thrust nappe have been discovered. Also, in this region, the authors discovered the widely distributed active traces of the ancients and gained a lot of the stoneware. Finally,the authors discuss the tectonic features of this region and consider that it should belong to the old North China continent. |
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| Keywords: | Sonid Zuoqi new discovery tectonic framework tectonic evolution tectonic feature |
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